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{{Short description|Series of 1950s US nuclear tests}}
⚫
{{Use mdy dates|date=November 2018}}
{{see also|List of nuclear weapons tests of the United States}}
{{see also|List of nuclear weapons tests of the United States}}
⚫
{{Use mdy dates|date=November 2018}}
{{Infobox nuclear weapons test
{{Infobox nuclear weapons test
|name = Operation Upshot–Knothole
|name = Operation Upshot–Knothole
|picture = File:Nuclear artillery test Grable Event - Part of Operation Upshot-Knothole.jpg
|picture = File:UpshotKnotholeGrable.gif
|picture_description = The ''Grable'' test, with the ''[[M65 Atomic Cannon|Atomic Annie]]'' artillery piece used to fire the warhead.
|picture_description = Upshot-Knothole ''Grable'', 15 kilotons.
|country = United States
|country = United States
|test_site = {{plainlist|
|test_site = {{plainlist|
Line 20: Line 21:
'''Operation Upshot–Knothole''' was a series of eleven nuclear test shots conducted in 1953 at the [[Nevada Test Site]]. It followed ''[[Operation Ivy]]'' and preceded ''[[Operation Castle]]''.
'''Operation Upshot–Knothole''' was a series of eleven nuclear test shots conducted in 1953 at the [[Nevada Test Site]]. It followed ''[[Operation Ivy]]'' and preceded ''[[Operation Castle]]''.


Over 21,000 soldiers took part in the ground exercise [[Desert Rock V]] in conjunction with the ''Grable'' shot.<ref>[http://www.dtra.mil/documents/ntpr/factsheets/Upshot_Knothole.pdf Operation UPSHOT-KNOTHOLE Fact Sheet] {{webarchive|url=https://web.archive.org/web/20130218012525/http://www.dtra.mil/documents/ntpr/factsheets/Upshot_Knothole.pdf |date=February 18, 2013}}, Defense Threat Reduction Agency</ref> ''Grable'' was a 280mm [[Artillery fired atomic projectile|AFAP]] shell fired from the "[[nuclear artillery|Atomic Cannon]]" and was viewed by a number of high-ranking military officials.
Over 21,000 soldiers took part in the ground exercise [[Desert Rock V]] in conjunction with the ''[[Upshot-Knothole Grable]]'' shot.<ref>{{Cite report| url=http://www.dtra.mil/documents/ntpr/factsheets/Upshot_Knothole.pdf |title=Operation UPSHOT-KNOTHOLE Fact Sheet |publisher=Defense Threat Reduction Agency }}{{webarchive|url=https://web.archive.org/web/20130218012525/http://www.dtra.mil/documents/ntpr/factsheets/Upshot_Knothole.pdf |date=February 18, 2013}}</ref> ''Grable'' was a 280mm Artillery Fired Atomic Projectile (AFAP) shell fired from the "[[M65 atomic cannon|Atomic Cannon]]" and was viewed by a number of high-ranking military officials.

⚫
The test series was notable as containing the first time an AFAP shell was fired (''GRABLE'' Shot), the first two shots (both [[Fizzle (nuclear test)|fizzles]]) by University of California Radiation Laboratory—Livermore (now [[Lawrence Livermore National Laboratory]]), and for testing out some of the thermonuclear components that would be used for the massive thermonuclear series of [[Operation Castle]]. One primary device ([[RACER IV|RACER]]) was tested in thermonuclear system mockup assemblies of [[Mark 14 nuclear bomb|TX-14]], [[Mark 16 nuclear bomb|TX-16]], and [[Mark 17 nuclear bomb|TX-17]]/[[Mark 24 nuclear bomb|TX-24]], to examine and evaluate the behaviour of radiation cases and the compression of the secondary geometries by the primary's x-rays prior to full-scale testing during [[Operation Castle|Castle]].<ref name="swordsoarIII">{{cite book |author-link=Chuck Hansen |first=Chuck |last=Hansen |title=Swords of Armageddon |volume=III |date=1995 |url=http://www.uscoldwar.com |access-date=December 28, 2016}}</ref>{{refpage|192}} Following RACER's dodgy performance, the COBRA primary was used in the emergency capability [[Mark 14 nuclear bomb|ALARM CLOCK]], [[Mark 16 nuclear bomb|JUGHEAD]], [[Mark 17 nuclear bomb|RUNT I]], [[Mark 24 nuclear bomb|RUNT II]] thermonuclear devices, as well as in the [[Castle Bravo|SHRIMP]] device.<ref name="swordsoarIII" />{{refpage|200}} RACER IV (as redesigned and proof-tested in the [[Upshot-Knothole Simon|Simon]] test) was employed as primary for the ZOMBIE,<ref name="swordsoarIII" />{{refpage|200}} RAMROD and [[Castle Koon|MORGENSTERN]]<ref name="swordsoarIII" />{{refpage|318}} devices.

Navy scientist Pauline Silvia conducted experiments during the tests, and would later be profiled in the 2010 documentary [[Atomic Mom]].<ref>{{cite web|url=https://www.international.ucla.edu/asia/article/115394|title='Atomic Mom' Filmmaker Reveals Secret Stories of the Bomb|author=Olvera, Lorena|publisher=UCLA Asia Pacific Center|accessdate=2024-12-06}}</ref>

==Nuclear tests==
===Annie===
Planned yield for '''Annie''' was {{convert|15|ktTNT}}, actual yield based on radiochemical analysis was {{convert|16.2|ktTNT}}.<ref>{{Cite report| publisher = NAVAL AIR MATERIAL CENTER PHILADELPHIAPA| author1 = Rogin, Leo| author2 = DuPont, Alden C| author3 = Weeber, Christian G| title = Operation Upshot-Knothole. Project 5.1. Atomic Weapon Effects on AD Type Aircraft in Flight| accessdate = 2023-09-30| url = https://apps.dtic.mil/sti/citations/ADA387404|ref={{harvid|Operation Upshot-Knothole. Project 5.1. Atomic Weapon Effects on AD Type Aircraft in Flight}}|page=25}}</ref>

===Nancy===
Planned yield for '''Nancy''' was {{convert|40|ktTNT}}, actual yield based on radiochemical analysis was {{convert|24.5|ktTNT}}.{{sfn|Operation Upshot-Knothole. Project 5.1. Atomic Weapon Effects on AD Type Aircraft in Flight|p=28}}

===Simon===
Planned yield for '''Simon''' was {{convert|33|ktTNT}}, actual yield based on radiochemical analysis was {{convert|43.4|ktTNT}}.{{sfn|Operation Upshot-Knothole. Project 5.1. Atomic Weapon Effects on AD Type Aircraft in Flight|p=32}}


===Harry===
[[File:Operation Upshot test.ogv|thumb|left|Upshot–Knothole Grable test (film)]]
Planned yield for '''Harry''' was {{convert|37|ktTNT}}, actual yield based on radiochemical analysis was {{convert|27|ktTNT}}.{{sfn|Operation Upshot-Knothole. Project 5.1. Atomic Weapon Effects on AD Type Aircraft in Flight|p=36}}
⚫
The test series was notable as containing the first time an Artillery Fired Atomic Projectile [[Artillery fired atomic projectile|AFAP]] artillery shell was fired (''GRABLE'' Shot), the first two shots (both [[Fizzle (nuclear test)|fizzles]]) by University of California Radiation Laboratory—Livermore (now [[Lawrence Livermore National Laboratory]]), and for testing out some of the thermonuclear components that would be used for the massive thermonuclear series of [[Operation Castle]]. One primary device ([[RACER IV|RACER]]) was tested in thermonuclear system mockup assemblies of [[Mark 14 nuclear bomb|TX-14]], [[Mark 16 nuclear bomb|TX-16]], and [[Mark 17 nuclear bomb|TX-17]]/[[Mark 24 nuclear bomb|TX-24]], to examine and evaluate the behaviour of radiation cases and the compression of the secondary geometries by the primary's x-rays prior to full-scale testing during [[Operation Castle|Castle]].<ref name="swordsoarIII">{{cite book |authorlink=Chuck Hansen |first=Chuck |last=Hansen |title=Swords of Armageddon |volume=III |date=1995 |url=http://www.uscoldwar.com |accessdate=December 28, 2016}}</ref>{{refpage|192}} Following RACER's dodgy performance, the COBRA primary was used in the emergency capability [[Mark 14 nuclear bomb|ALARM CLOCK]], [[Mark 16 nuclear bomb|JUGHEAD]], [[Mark 17 nuclear bomb|RUNT I]], [[Mark 24 nuclear bomb|RUNT II]] thermonuclear devices, as well as in the [[Castle Bravo|SHRIMP]] device.<ref name="swordsoarIII" />{{refpage|200}} RACER IV (as redesigned and proof-tested in the [[Upshot-Knothole Simon|Simon]] test) was employed as primary for the ZOMBIE,<ref name="swordsoarIII" />{{refpage|200}} RAMROD and [[Castle Koon|MORGENSTERN]]<ref name="swordsoarIII" />{{refpage|318}} devices.


===Encore===
{{-}}
Planned yield for '''Encore''' was {{convert|31|ktTNT}}, actual yield based on radiochemical analysis was {{convert|26|ktTNT}}.{{sfn|Operation Upshot-Knothole. Project 5.1. Atomic Weapon Effects on AD Type Aircraft in Flight|p=41}}


==List of tests==
==List of tests==
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!style="background:#ffdead;" | Name<ref group=note>The US, France and Great Britain have code-named their test events, while the USSR and China did not, and therefore have only test numbers (with some exceptions &ndash; Soviet peaceful explosions were named). Word translations into English in parentheses unless the name is a proper noun. A dash followed by a number indicates a member of a salvo event. The US also sometimes named the individual explosions in such a salvo test, which results in "name1 &ndash; 1(with name2)". If test is canceled or aborted, then the row data like date and location discloses the intended plans, where known.</ref>
!style="background:#ffdead;" | Name<ref group=note>The US, France and Great Britain have code-named their test events, while the USSR and China did not, and therefore have only test numbers (with some exceptions &ndash; Soviet peaceful explosions were named). Word translations into English in parentheses unless the name is a proper noun. A dash followed by a number indicates a member of a salvo event. The US also sometimes named the individual explosions in such a salvo test, which results in "name1 &ndash; 1(with name2)". If test is canceled or aborted, then the row data like date and location discloses the intended plans, where known.</ref>
!style="background:#efefef;" | Date time ([[Universal Time|UT]])
!style="background:#efefef;" | Date time ([[Universal Time|UT]])
!style="background:#ffdead;" | Local [[Time Zone|time zone]]<ref group=note>To convert the UT time into standard local, add the number of hours in parentheses to the UT time; for local daylight saving time, add one additional hour. If the result is earlier than 00:00, add 24 hours and subtract 1 from the day; if it is 24:00 or later, subtract 24 hours and add 1 to the day. All historical timezone data (excepting Johnston Atoll) are derived from here:</ref><ref>{{cite web| title=Timezone Historical Database| publisher=iana.com| url=http://www.ietf.org/timezones/| accessdate=March 8, 2014}}</ref>
!style="background:#ffdead;" | Local [[Time Zone|time zone]]<ref group=note>To convert the UT time into standard local, add the number of hours in parentheses to the UT time; for local daylight saving time, add one additional hour. If the result is earlier than 00:00, add 24 hours and subtract 1 from the day; if it is 24:00 or later, subtract 24 hours and add 1 to the day. Historical time zone data obtained from the [[tz database|IANA time zone database]].</ref><ref>{{cite web| title=Time Zone Historical Database| publisher=iana.com| url=http://www.ietf.org/timezones/| access-date=March 8, 2014}}</ref>
!style="background:#efefef;" | [[List of nuclear test sites|Location]]<ref group=note>Rough place name and a latitude/longitude reference; for rocket-carried tests, the launch location is specified before the detonation location, if known. Some locations are extremely accurate; others (like airdrops and space blasts) may be quite inaccurate. "~" indicates a likely pro-forma rough location, shared with other tests in that same area.</ref>
!style="background:#efefef;" | [[List of nuclear test sites|Location]]<ref group=note>Rough place name and a latitude/longitude reference; for rocket-carried tests, the launch location is specified before the detonation location, if known. Some locations are extremely accurate; others (like airdrops and space blasts) may be quite inaccurate. "~" indicates a likely pro-forma rough location, shared with other tests in that same area.</ref>
!style="background:#ffdead;" | [[Elevation]] <br>+ height<ref group=note>Elevation is the ground level at the point directly below the explosion relative to sea level; height is the additional distance added or subtracted by tower, balloon, shaft, tunnel, air drop or other contrivance. For rocket bursts the ground level is "N/A". In some cases it is not clear if the height is absolute or relative to ground, for example, ''Plumbbob/John''. No number or units indicates the value is unknown, while "0" means zero. Sorting on this column is by elevation and height added together.</ref>
!style="background:#ffdead;" | [[Elevation]] + height<ref group=note>Elevation is the ground level at the point directly below the explosion relative to sea level; height is the additional distance added or subtracted by tower, balloon, shaft, tunnel, air drop or other contrivance. For rocket bursts the ground level is "N/A". In some cases it is not clear if the height is absolute or relative to ground, for example, ''Plumbbob/John''. No number or units indicates the value is unknown, while "0" means zero. Sorting on this column is by elevation and height added together.</ref>
!style="background:#efefef;" | Delivery<ref group=note>Atmospheric, airdrop, balloon, gun, cruise missile, rocket, surface, tower, and barge are all disallowed by the [[Partial Nuclear Test Ban Treaty]]. Sealed shaft and tunnel are underground, and remained useful under the PTBT. Intentional cratering tests are borderline; they occurred under the treaty, were sometimes protested, and generally overlooked if the test was declared to be a peaceful use.</ref><br />Purpose<ref group=note>Include weapons development, weapon effects, safety test, transport safety test, war, science, joint verification and industrial/peaceful, which may be further broken down.</ref>
!style="background:#efefef;" | Delivery<ref group=note>Atmospheric, airdrop, balloon, gun, cruise missile, rocket, surface, tower, and barge are all disallowed by the [[Partial Nuclear Test Ban Treaty]]. Sealed shaft and tunnel are underground, and remained useful under the PTBT. Intentional cratering tests are borderline; they occurred under the treaty, were sometimes protested, and generally overlooked if the test was declared to be a peaceful use.</ref><br />Purpose<ref group=note>Include weapons development, weapon effects, safety test, transport safety test, war, science, joint verification and industrial/peaceful, which may be further broken down.</ref>
!style="background:#efefef;" | [[List of nuclear weapons|Device]]<ref group=note>Designations for test items where known, "?" indicates some uncertainty about the preceding value, nicknames for particular devices in quotes. This category of information is often not officially disclosed.</ref>
!style="background:#efefef;" | [[List of nuclear weapons|Device]]<ref group=note>Designations for test items where known, "?" indicates some uncertainty about the preceding value, nicknames for particular devices in quotes. This category of information is often not officially disclosed.</ref>
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| style="text-align:center;" | PST (-8&nbsp;hrs)<br /> || [[Nevada National Security Site|NTS]] Area 3
| style="text-align:center;" | PST (-8&nbsp;hrs)<br /> || [[Nevada National Security Site|NTS]] Area 3
{{coord|37.0477|-116.022|name=Annie|display=inline}}
{{coord|37.0477|-116.022|name=Annie|display=inline}}
| style="text-align: right;" |{{sort|001320|}}{{convert|1230|m|abbr=on}}<br>+ {{convert|90|m|abbr=on}}
| style="text-align: right;" |{{sort|001320|}}{{convert|1230|m|abbr=on}}<br />+ {{convert|90|m|abbr=on}}
| tower,<br />weapons development
| tower,<br />weapons development
| [[Mark 5 nuclear bomb|TX-5HE]] "XR-3" Type D pit
| [[Mark 5 nuclear bomb|TX-5HE]] "XR-3" Type D pit
Line 60: Line 76:
| style="text-align:center;" | PST (-8&nbsp;hrs)<br /> || [[Nevada National Security Site|NTS]] Area 4
| style="text-align:center;" | PST (-8&nbsp;hrs)<br /> || [[Nevada National Security Site|NTS]] Area 4
{{coord|37.0955|-116.1037|name=Nancy|display=inline}}
{{coord|37.0955|-116.1037|name=Nancy|display=inline}}
| style="text-align: right;" |{{sort|001320|}}{{convert|1230|m|abbr=on}}<br>+ {{convert|90|m|abbr=on}}
| style="text-align: right;" |{{sort|001320|}}{{convert|1230|m|abbr=on}}<br />+ {{convert|90|m|abbr=on}}
| tower,<br />weapons development
| tower,<br />weapons development
| [[Mark 14 nuclear bomb|TX-14]] "Nevada Zombie"
| [[Mark 14 nuclear bomb|TX-14]] "Nevada Zombie"
Line 72: Line 88:
| style="text-align:center;" | PST (-8&nbsp;hrs)<br /> || [[Nevada National Security Site|NTS]] Area 7
| style="text-align:center;" | PST (-8&nbsp;hrs)<br /> || [[Nevada National Security Site|NTS]] Area 7
{{coord|37.0827|-116.0248|name=Ruth|display=inline}}
{{coord|37.0827|-116.0248|name=Ruth|display=inline}}
| style="text-align: right;" |{{sort|001360|}}{{convert|1270|m|abbr=on}} <br>+ {{convert|90|m|abbr=on}}
| style="text-align: right;" |{{sort|001360|}}{{convert|1270|m|abbr=on}}<br />+ {{convert|90|m|abbr=on}}
| tower,<br />weapons development
| tower,<br />weapons development
| [[Mark 6 nuclear bomb|MK-6]]<ref name="swordsoarVII">{{cite book |authorlink=Chuck Hansen |first=Chuck |last=Hansen |title=Swords of Armageddon |volume=VII |date=1995 |url=http://www.uscoldwar.com |accessdate=December 28, 2016}}</ref>{{refpage|198}}
| [[Mark 6 nuclear bomb|MK-6]]<ref name="swordsoarVII">{{cite book |author-link=Chuck Hansen |first=Chuck |last=Hansen |title=Swords of Armageddon |volume=VII |date=1995 |url=http://www.uscoldwar.com |access-date=December 28, 2016}}</ref>{{refpage|198}}
"Hydride I"
"Hydride I"
| style="text-align:center;" | {{sort|000002000|200&nbsp;t}}
| style="text-align:center;" | {{sort|000002000|200&nbsp;t}}
| I-131 detected, {{convert|28|kCi|TBq|abbr=on}}
| I-131 detected, {{convert|28|kCi|TBq|abbr=on}}
| <ref name=LT_150 /><ref name=LT_148 /><ref name=LT_6 /><ref name=LT_1 />
| <ref name=LT_150 /><ref name=LT_148 /><ref name=LT_6 /><ref name=LT_1 />
| 1st UCRL device, a [[uranium deuteride]] core,<ref name="swordsoarIII" />{{refpage|202}} meant to explore deuterated polyethylene mixed with uranium as thermonuclear fuel,<ref name="herk">{{cite book |authorlink=Gregg Herken |first=Gregg |last=Herken |title=Brotherhood of the Bomb |url=https://archive.org/details/brotherhoodofbom0000herk |url-access=registration |date=2003}}</ref>{{refpage|chap.15}}<ref name="swordsoarIII" />{{refpage|203}} and if successful to lead also to a compact thermonuclear primary.<ref name="swordsoarIII" />{{refpage|149}} Predicted yield was 1.5 to 3 kilotons, max. theoretical was 20 kt.<ref name="swordsoarVII" />{{refpage|96}} Device [[fizzle (nuclear test)|fizzled]] - deuterium moderated (slowed-down) neutrons more than expected and quenched the reaction. Embarrassing for designers, as it left {{convert|200|ft|abbr=on}} of tower still standing (see [[:File:RUTH test tower 1953-03-31.jpg|image of tower]]).
| 1st UCRL device, a [[uranium deuteride]] core,<ref name="swordsoarIII" />{{refpage|202}} meant to explore deuterated polyethylene mixed with uranium as thermonuclear fuel,<ref name="herk">{{cite book |author-link=Gregg Herken |first=Gregg |last=Herken |title=Brotherhood of the Bomb |url=https://archive.org/details/brotherhoodofbom0000herk |url-access=registration |date=2003}}</ref>{{refpage|chap.15}}<ref name="swordsoarIII" />{{refpage|203}} and if successful to lead also to a compact thermonuclear primary.<ref name="swordsoarIII" />{{refpage|149}} Predicted yield was 1.5 to 3 kilotons, max. theoretical was 20 kt.<ref name="swordsoarVII" />{{refpage|96}} Device [[fizzle (nuclear test)|fizzled]] - deuterium moderated (slowed-down) neutrons more than expected and quenched the reaction. Embarrassing for designers, as it left {{convert|200|ft|abbr=on}} of tower still standing (see [[:File:RUTH test tower 1953-03-31.jpg|image of tower]]).
|- style="vertical-align: top;"
|- style="vertical-align: top;"
! ''[[Upshot-Knothole Dixie|Dixie]]''{{anchor|Dixie}}
! ''[[Upshot-Knothole Dixie|Dixie]]''{{anchor|Dixie}}
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| style="text-align:center;" | PST (-8&nbsp;hrs)<br /> || [[Nevada National Security Site|NTS]] Area 7
| style="text-align:center;" | PST (-8&nbsp;hrs)<br /> || [[Nevada National Security Site|NTS]] Area 7
{{coord|37.0847|-116.0189|name=Dixie|display=inline}}
{{coord|37.0847|-116.0189|name=Dixie|display=inline}}
| style="text-align: right;" |{{sort|003114|}}{{convert|1284|m|abbr=on}} <br>+ {{convert|1830|m|abbr=on}}
| style="text-align: right;" |{{sort|003114|}}{{convert|1284|m|abbr=on}}<br />+ {{convert|1830|m|abbr=on}}
| free air drop,<br />weapons development
| free air drop,<br />weapons development
| [[Mark 5 nuclear bomb|MK-5D]]
| [[Mark 5 nuclear bomb|MK-5D]]
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| style="text-align:center;" | PST (-8&nbsp;hrs)<br /> || [[Nevada National Security Site|NTS]] Area 4
| style="text-align:center;" | PST (-8&nbsp;hrs)<br /> || [[Nevada National Security Site|NTS]] Area 4
{{coord|37.09889|-116.09332|name=Ray|display=inline}}
{{coord|37.09889|-116.09332|name=Ray|display=inline}}
| style="text-align: right;" |{{sort|001326|}}{{convert|1296|m|abbr=on}} <br>+ {{convert|30|m|abbr=on}}
| style="text-align: right;" |{{sort|001326|}}{{convert|1296|m|abbr=on}}<br />+ {{convert|30|m|abbr=on}}
| tower,<br />weapons development
| tower,<br />weapons development
| [[Mark 6 nuclear bomb|MK-6]]<ref name="swordsoarVII" />{{refpage|198}}
| [[Mark 6 nuclear bomb|MK-6]]<ref name="swordsoarVII" />{{refpage|198}}
"Hydride II"
"Hydride II"
| style="text-align:center;" | {{sort|000002000|220&nbsp;t}}<ref name="OpUKSum">{{cite book |authorlink=Field Command Armed Forces Special Weapons Project |title=Operation Upshot-Knothole Summary Report of the Technical Director |date=1953 |url=https://ntrl.ntis.gov/NTRL/dashboard/searchResults/titleDetail/PB97112866.xhtml |accessdate=2019-02-17}}</ref>{{refpage|101}}
| style="text-align:center;" | {{sort|000002000|220&nbsp;t}}<ref name="OpUKSum">{{cite book |title=Operation Upshot-Knothole Summary Report of the Technical Director |date=1953 |url=https://ntrl.ntis.gov/NTRL/dashboard/searchResults/titleDetail/PB97112866.xhtml |access-date=2019-02-17}}</ref>{{refpage|101}}
| I-131 detected, {{convert|28|kCi|TBq|abbr=on}}
| I-131 detected, {{convert|28|kCi|TBq|abbr=on}}
| <ref name=LT_150 /><ref name=LT_148 /><ref name=LT_6 /><ref name=LT_1 />
| <ref name=LT_150 /><ref name=LT_148 /><ref name=LT_6 /><ref name=LT_1 />
| 2nd UCRL device, uranium deuteride<ref name="swordsoarIII" />{{refpage|202}} meant to explore deuterated polyethylene mixed with uranium as thermonuclear fuel,<ref name="herk"/>{{refpage|chap.15}}<ref name="swordsoarIII" />{{refpage|203}} and if successful to lead also to a compact thermonuclear primary;<ref name="swordsoarIII" />{{refpage|149}} Used different mix from ''Ruth''<ref name="swordsoarIII" />{{refpage|202}} and it also fizzled. Legend has it that 100 foot tower was used, to avoid embarrassment in case of fizzle.
| 2nd UCRL device, uranium deuteride<ref name="swordsoarIII" />{{refpage|202}} meant to explore deuterated polyethylene mixed with uranium as thermonuclear fuel,<ref name="herk" />{{refpage|chap.15}}<ref name="swordsoarIII" />{{refpage|203}} and if successful to lead also to a compact thermonuclear primary;<ref name="swordsoarIII" />{{refpage|149}} Used different mix from ''Ruth''<ref name="swordsoarIII" />{{refpage|202}} and it also fizzled. A 100-foot tower was apparently used to avoid embarrassment in case of fizzle.
|- style="vertical-align: top;"
|- style="vertical-align: top;"
! ''Badger''{{anchor|Badger}}
! ''Badger''{{anchor|Badger}}
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| style="text-align:center;" | PST (-8&nbsp;hrs)<br /> || [[Nevada National Security Site|NTS]] Area 2
| style="text-align:center;" | PST (-8&nbsp;hrs)<br /> || [[Nevada National Security Site|NTS]] Area 2
{{coord|37.1383|-116.1187|name=Badger|display=inline}}
{{coord|37.1383|-116.1187|name=Badger|display=inline}}
| style="text-align: right;" |{{sort|001460|}}{{convert|1370|m|abbr=on}} <br>+ {{convert|90|m|abbr=on}}
| style="text-align: right;" |{{sort|001460|}}{{convert|1370|m|abbr=on}}<br />+ {{convert|90|m|abbr=on}}
| tower,<br />weapons development
| tower,<br />weapons development
| [[Mark 16 nuclear bomb|TX-16]] "Buzzard"
| [[Mark 16 nuclear bomb|TX-16]] "Buzzard"
Line 123: Line 139:
| style="text-align:center;" | PST (-8&nbsp;hrs)<br /> || [[Nevada National Security Site|NTS]] Area 1
| style="text-align:center;" | PST (-8&nbsp;hrs)<br /> || [[Nevada National Security Site|NTS]] Area 1
{{coord|37.053|-116.1036|name=Simon|display=inline}}
{{coord|37.053|-116.1036|name=Simon|display=inline}}
| style="text-align: right;" |{{sort|001384|}}{{convert|1294|m|abbr=on}} <br>+ {{convert|90|m|abbr=on}}
| style="text-align: right;" |{{sort|001384|}}{{convert|1294|m|abbr=on}}<br />+ {{convert|90|m|abbr=on}}
| tower,<br />weapons development
| tower,<br />weapons development
| [[Mark 17 nuclear bomb|TX-17/24]] "Simultaneity"
| [[Mark 17 nuclear bomb|TX-17/24]] "Simultaneity"
Line 135: Line 151:
| style="text-align:center;" | PST (-8&nbsp;hrs)<br /> || [[Nevada National Security Site|NTS]] Area 5
| style="text-align:center;" | PST (-8&nbsp;hrs)<br /> || [[Nevada National Security Site|NTS]] Area 5
{{coord|36.8|-115.929|name=Encore|display=inline}}
{{coord|36.8|-115.929|name=Encore|display=inline}}
| style="text-align: right;" |{{sort|001680|}}{{convert|940|m|abbr=on}} <br>+ {{convert|740|m|abbr=on}}
| style="text-align: right;" |{{sort|001680|}}{{convert|940|m|abbr=on}}<br />+ {{convert|740|m|abbr=on}}
| free air drop,<br />weapon effect
| free air drop,<br />weapon effect
| [[Mark 6 nuclear bomb|MK-6D]]
| [[Mark 6 nuclear bomb|MK-6D]]
Line 147: Line 163:
| style="text-align:center;" | PST (-8&nbsp;hrs)<br /> || [[Nevada National Security Site|NTS]] Area 3
| style="text-align:center;" | PST (-8&nbsp;hrs)<br /> || [[Nevada National Security Site|NTS]] Area 3
{{coord|37.0402|-116.0261|name=Harry|display=inline}}
{{coord|37.0402|-116.0261|name=Harry|display=inline}}
| style="text-align: right;" |{{sort|001314|}}{{convert|1224|m|abbr=on}} <br>+ {{convert|90|m|abbr=on}}
| style="text-align: right;" |{{sort|001314|}}{{convert|1224|m|abbr=on}}<br />+ {{convert|90|m|abbr=on}}
| tower,<br />weapons development
| tower,<br />weapons development
| [[Mark 13 nuclear bomb|TX-13D]] "Hamlet"
| [[Mark 13 nuclear bomb|TX-13D]] "Hamlet"
Line 159: Line 175:
| style="text-align:center;" | PST (-8&nbsp;hrs)<br /> || Launch from NTS Areas 5, 11, Frenchman Flat: 5
| style="text-align:center;" | PST (-8&nbsp;hrs)<br /> || Launch from NTS Areas 5, 11, Frenchman Flat: 5
{{coord|36.70428|-115.97387|name=Launch_Grable|display=inline}}, elv: {{convert|950|+|5|m|abbr=on}};<br />Detonation over [[Nevada National Security Site|NTS]] {{coord|36.793|-115.9156|name=Grable|display=inline}}
{{coord|36.70428|-115.97387|name=Launch_Grable|display=inline}}, elv: {{convert|950|+|5|m|abbr=on}};<br />Detonation over [[Nevada National Security Site|NTS]] {{coord|36.793|-115.9156|name=Grable|display=inline}}
| style="text-align: right;" |{{sort|001120|}}{{convert|960|m|abbr=on}} <br>+ {{convert|160|m|abbr=on}}
| style="text-align: right;" |{{sort|001120|}}{{convert|960|m|abbr=on}}<br />+ {{convert|160|m|abbr=on}}
| gun deployed,<br />weapon effect
| gun deployed,<br />weapon effect
| [[W9 (nuclear warhead)]] AFAP "Gun"
| [[W9 (nuclear warhead)|W9]] AFAP "Gun"
| style="text-align:center;" | {{sort|000150000|15&nbsp;kt}}
| style="text-align:center;" | {{sort|000150000|15&nbsp;kt}}
| I-131 detected, {{convert|2.1|MCi|PBq|abbr=on}}
| I-131 detected, {{convert|2.1|MCi|PBq|abbr=on}}
| <ref name=LT_150 /><ref name=LT_148 /><ref name=LT_24 /><ref name=LT_6 /><ref name=LT_1 />
| <ref name=LT_150 /><ref name=LT_148 /><ref name=LT_24 /><ref name=LT_6 /><ref name=LT_1 />
| The 2nd of four gun-type device tests. Fired from ''Annie'' [[M65 Atomic Cannon]] {{convert|11|km|abbr=on}} downrange. 280mm shell, {{convert|365|kg|abbr=on}}. Detonation at {{convert|200|ft}} SW of target. Desert Rock V. Major effects test.
| The 2nd of four gun-type device tests. Fired from the M65 Atomic Cannon "''Atomic Annie''" {{convert|11|km|abbr=on}} downrange. 280mm shell, {{convert|365|kg|abbr=on}}. Detonation at {{convert|200|ft}} SW of target. Desert Rock V. Major effects test.
|- style="vertical-align: top;"
|- style="vertical-align: top;"
! ''Climax''{{anchor|Climax}}
! ''Climax''{{anchor|Climax}}
Line 171: Line 187:
| style="text-align:center;" | PST (-8&nbsp;hrs)<br /> || [[Nevada National Security Site|NTS]] Area 7
| style="text-align:center;" | PST (-8&nbsp;hrs)<br /> || [[Nevada National Security Site|NTS]] Area 7
{{coord|37.0875|-116.0192|name=Climax|display=inline}}
{{coord|37.0875|-116.0192|name=Climax|display=inline}}
| style="text-align: right;" |{{sort|001698|}}{{convert|1288|m|abbr=on}}<br>+ {{convert|410|m|abbr=on}}
| style="text-align: right;" |{{sort|001698|}}{{convert|1288|m|abbr=on}}<br />+ {{convert|410|m|abbr=on}}
| free air drop,<br />weapons development
| free air drop,<br />weapons development
| [[Mark 7 nuclear bomb|MK-7]], "Cobra", Type D pit
| [[Mark 7 nuclear bomb|MK-7]], "Cobra", Type D pit
Line 180: Line 196:
|}
|}
{{reflist|group=note}}
{{reflist|group=note}}

==Gallery==
<gallery class="center" widths="220">
File:Upshot Knothole Grable.gif|Full uncut detonation of Upshot-Knothole ''Grable'', launched out of the ''[[M65 Atomic Cannon|Atomic Annie]]'' device on 5/25/1953. The footage at normal speed is about {{frac|2|1|2}} minutes.
File:Grable Close Up.gif|Close-up slow motion shot of ''Grable'' fire-ball, mach-stem and surface effects,
File:UpshotKnotholeEncore.gif|Upshot-Knothole ''Encore'', 27-kilotons.
File:UpshotKnotholeRuth2.gif|Upshot-Knothole ''Ruth'', 0.2-kilotons.
File:UpshotKnotholeRuth1.gif|Upshot-Knothole ''Ruth'', Note close proximity to highway in foreground as to the scale of detonation.
File:RUTH test tower 1953-03-31.jpg|The mangled tower for the ''Ruth'' test. The explosion failed to level the testing tower, only somewhat damaging it.
File:Operation Upshot-Knothole - Badger 001.jpg|Upshot-Knothole Badger, 23 Kilotons
File:Operation Upshot-Knothole - Harry.jpg|Upshot-Knothole Harry, 32 Kilotons
File:Upshot-Knothole Encore 001.jpg|Encore's Mushroom Cloud from far away
File:Upshot-Knothole Encore (1953) (cloud).jpg|Encore's Mushroom Cloud
File:Upshot-Knothole Nancy 001.jpg|Upshot-Knothole Nancy, 24 Kilotons
File:Upshot-Knothole Dixie 001.jpg|Upshot-Knothole Dixie, 11 Kilotons
File:Operation Upshot-Knothole - Ray - Detonation.ogv|Upshot-Knothole Ray, 220 Tons
File:Upshot-Knothole Simon 002.jpg|Upshot-Knothole Simon, 43 Kilotons
File:Project 30-18 - Operation Upshot-Knothole (Nevada Test Site) Detonation - DPLA - ba2f6b3d7a385526cfccf6d4298bf02e.jpg|Grable's Mushroom Cloud
File:Upshot-Knothole Annie 001.jpg|Upshot-Knothole Annie, 16 Kilotons
File:Upshot-Knothole Badger 001.jpg|Badger's Mushroom Cloud
</gallery>


==References==
==References==
Line 188: Line 225:
<ref name=LT_1>{{citation| last1=Yang| first1=Xiaoping| first2=Robert| last2=North| first3=Carl| last3=Romney| date=August 2000| title=CMR Nuclear Explosion Database (Revision 3)| publisher=SMDC Monitoring Research}}</ref>
<ref name=LT_1>{{citation| last1=Yang| first1=Xiaoping| first2=Robert| last2=North| first3=Carl| last3=Romney| date=August 2000| title=CMR Nuclear Explosion Database (Revision 3)| publisher=SMDC Monitoring Research}}</ref>
<ref name=LT_24>{{citation| last=Hansen| first=Chuck| year=1995| title=The Swords of Armageddon, Vol. 8| publisher=Chukelea Publications| location=Sunnyvale, CA| ISBN=978-0-9791915-1-0}}</ref>
<ref name=LT_24>{{citation| last=Hansen| first=Chuck| year=1995| title=The Swords of Armageddon, Vol. 8| publisher=Chukelea Publications| location=Sunnyvale, CA| ISBN=978-0-9791915-1-0}}</ref>
<ref name=LT_150>{{citation| url=http://www.cancer.gov/i131/fallout/Chapter2.pdf| accessdate=January 5, 2014| title=Estimated exposures and thyroid doses received by the American people from Iodine-131 in fallout following Nevada atmospheric nuclear bomb tests, Chapter 2| publisher=National Cancer Institute| year=1997}}</ref>
<ref name=LT_150>{{citation| url=http://www.cancer.gov/i131/fallout/Chapter2.pdf| access-date=January 5, 2014| title=Estimated exposures and thyroid doses received by the American people from Iodine-131 in fallout following Nevada atmospheric nuclear bomb tests, Chapter 2| publisher=National Cancer Institute| year=1997}}</ref>
<ref name=LT_148>{{citation| url=http://www.nuclearweaponarchive.org/Usa/Tests| accessdate=January 6, 2014| last=Sublette| first=Carey| title=Nuclear Weapons Archive}}</ref>
<ref name=LT_148>{{citation| url=http://www.nuclearweaponarchive.org/Usa/Tests| access-date=January 6, 2014| last=Sublette| first=Carey| title=Nuclear Weapons Archive}}</ref>
<ref name=LT_6>{{citation| publisher=Department of Energy, Nevada Operations Office| date=December 1, 2000| title=United States Nuclear Tests: July 1945 through September 1992| type=DOE/NV-209 REV15| location=Las Vegas, NV| url=http://www.nv.doe.gov/library/publications/historical/DOENV_209_REV15.pdf| accessdate=December 18, 2013| url-status=dead| archiveurl=https://web.archive.org/web/20061012160826/http://www.nv.doe.gov/library/publications/historical/DOENV_209_REV15.pdf| archivedate=October 12, 2006}}</ref>
<ref name=LT_6>{{citation| publisher=Department of Energy, Nevada Operations Office| date=December 1, 2000| title=United States Nuclear Tests: July 1945 through September 1992| type=DOE/NV-209 REV15| location=Las Vegas, NV| url=http://www.nv.doe.gov/library/publications/historical/DOENV_209_REV15.pdf| access-date=December 18, 2013| url-status=dead| archive-url=https://web.archive.org/web/20061012160826/http://www.nv.doe.gov/library/publications/historical/DOENV_209_REV15.pdf| archive-date=October 12, 2006}}</ref>
}}
}}
;Bibliography
;Bibliography

{{Refbegin|2}}
{{Refbegin|2}}
* {{Cite report |url=https://www.osti.gov/biblio/6380890 |title=Shots ENCORE to CLIMAX, the final four tests of the UPSHOT-KNOTHOLE Series, 8 May - 4 June 1953. Technical report |last=Massie |first=J. |last2=Maag |first2=C. |date=1982-01-15 |publisher=JRB Associates, Inc., McLean, VA (USA) |issue=AD-A-121634/0 |language=English |last3=Rohrer |first3=S. |last4=Shepanek |first4=R.}}
* Chuck Hansen, ''Swords of Armageddon, Version 2'' (Chukelea Publications, 1995-2007)
* Chuck Hansen, ''Swords of Armageddon, Version 2'' (Chukelea Publications, 1995–2007)
{{Refend}}
{{Refend}}


Line 204: Line 243:
* {{Internet Archive short film|id=The280mmGunattheNevadaProvingGround1953|name=The 280 mm Gun at the Nevada Proving Ground (1953)}}
* {{Internet Archive short film|id=The280mmGunattheNevadaProvingGround1953|name=The 280 mm Gun at the Nevada Proving Ground (1953)}}
* [http://www.atomicforum.org/usa/operations/upshotknothole/upshotknothole.html Operation Upshot-Knothole - 1953]
* [http://www.atomicforum.org/usa/operations/upshotknothole/upshotknothole.html Operation Upshot-Knothole - 1953]
* [http://video.google.com/videoplay?docid=7051037931271124293&q=upshot+knothole Film about Upshot Knothole Tests]
* [http://video.google.com/videoplay?docid=7051037931271124293&q=upshot+knothole Film about Upshot Knothole Tests] {{Webarchive|url=https://web.archive.org/web/20110519225012/http://video.google.com/videoplay?docid=7051037931271124293&q=upshot+knothole |date=May 19, 2011 }}
* Rice, James. ''Downwind of the Atomic State: Atmospheric Testing and the Rise of the Risk Society''. (New York University Press, 2023): https://nyupress.org/9781479815340/downwind-of-the-atomic-state/

{{US Nuclear Tests}}
{{US Nuclear Tests}}


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[[Category:1953 in Nevada]]
[[Category:1953 in Nevada]]
[[Category:1953 in the environment]]
[[Category:1953 in the environment]]
[[Category:Articles containing video clips]]

Latest revision as of 18:19, 6 December 2024

See also: List of nuclear weapons tests of the United States

Operation Upshot–Knothole
Upshot-Knothole Grable, 15 kilotons.
Information
CountryUnited States
Test site
  • NTS Areas 5, 11, Frenchman Flat
  • NTS, Areas 1-4, 6-10, Yucca Flat
Period1953
Number of tests11
Test typefree air drop, gun deployed, tower
Max. yield61 kilotonnes of TNT (260 TJ)
Test series chronology
Map all coordinates in "Operation Upshot–Knothole" using OpenStreetMap

Download coordinates as:

Operation Upshot–Knothole was a series of eleven nuclear test shots conducted in 1953 at the Nevada Test Site. It followed Operation Ivy and preceded Operation Castle.

Over 21,000 soldiers took part in the ground exercise Desert Rock V in conjunction with the Upshot-Knothole Grable shot.[1] Grable was a 280mm Artillery Fired Atomic Projectile (AFAP) shell fired from the "Atomic Cannon" and was viewed by a number of high-ranking military officials.

The test series was notable as containing the first time an AFAP shell was fired (GRABLE Shot), the first two shots (both fizzles) by University of California Radiation Laboratory—Livermore (now Lawrence Livermore National Laboratory), and for testing out some of the thermonuclear components that would be used for the massive thermonuclear series of Operation Castle. One primary device (RACER) was tested in thermonuclear system mockup assemblies of TX-14, TX-16, and TX-17/TX-24, to examine and evaluate the behaviour of radiation cases and the compression of the secondary geometries by the primary's x-rays prior to full-scale testing during Castle.[2]: 192  Following RACER's dodgy performance, the COBRA primary was used in the emergency capability ALARM CLOCK, JUGHEAD, RUNT I, RUNT II thermonuclear devices, as well as in the SHRIMP device.[2]: 200  RACER IV (as redesigned and proof-tested in the Simon test) was employed as primary for the ZOMBIE,[2]: 200  RAMROD and MORGENSTERN[2]: 318  devices.

Navy scientist Pauline Silvia conducted experiments during the tests, and would later be profiled in the 2010 documentary Atomic Mom.[3]

Nuclear tests

[edit]

Annie

[edit]

Planned yield for Annie was 15 kilotonnes of TNT (63 TJ), actual yield based on radiochemical analysis was 16.2 kilotonnes of TNT (68 TJ).[4]

Nancy

[edit]

Planned yield for Nancy was 40 kilotonnes of TNT (170 TJ), actual yield based on radiochemical analysis was 24.5 kilotonnes of TNT (103 TJ).[5]

Simon

[edit]

Planned yield for Simon was 33 kilotonnes of TNT (140 TJ), actual yield based on radiochemical analysis was 43.4 kilotonnes of TNT (182 TJ).[6]

Harry

[edit]

Planned yield for Harry was 37 kilotonnes of TNT (150 TJ), actual yield based on radiochemical analysis was 27 kilotonnes of TNT (110 TJ).[7]

Encore

[edit]

Planned yield for Encore was 31 kilotonnes of TNT (130 TJ), actual yield based on radiochemical analysis was 26 kilotonnes of TNT (110 TJ).[8]

List of tests

[edit]
United States' Upshot-Knothole series tests and detonations
Name[note 1] Date time (UT) Local time zone[note 2][9] Location[note 3] Elevation + height[note 4] Delivery[note 5]
Purpose[note 6] 		Device[note 7] Yield[note 8] Fallout[note 9] References Notes
Annie March 17, 1953 13:20:00.3 PST (-8 hrs)
 NTS Area 3

37°02′52″N 116°01′19″W / 37.0477°N 116.022°W / 37.0477; -116.022 (Annie)

1,230 m (4,040 ft)
+ 90 m (300 ft) 		tower,
weapons development 		TX-5HE "XR-3" Type D pit 16 kt I-131 detected, 2.4 MCi (89 PBq) [10][11][12][13][14] Investigated yield-vs-initiation time curve. Live news coverage. Desert Rock V. Two 2-story houses, 50 autos, bomb shelters in effects test.
Nancy March 24, 1953 13:10:00.0 PST (-8 hrs)
 NTS Area 4

37°05′44″N 116°06′13″W / 37.0955°N 116.1037°W / 37.0955; -116.1037 (Nancy)

1,230 m (4,040 ft)
+ 90 m (300 ft) 		tower,
weapons development 		TX-14 "Nevada Zombie" 24 kt I-131 detected, 3.6 MCi (130 PBq) [10][11][12][13][14] Component test of TX-14[2]: 193, 195  containing minimal quantities of Li-6D.[2]: 170  Desert Rock V. First proof-test of the RACER boosted primary with disappointing performance.[Note 1]
Ruth March 31, 1953 13:00:00.0 PST (-8 hrs)
 NTS Area 7

37°04′58″N 116°01′29″W / 37.0827°N 116.0248°W / 37.0827; -116.0248 (Ruth)

1,270 m (4,170 ft)
+ 90 m (300 ft) 		tower,
weapons development 		MK-6[15]: 198 

"Hydride I"

200 t I-131 detected, 28 kCi (1,000 TBq) [10][11][13][14] 1st UCRL device, a uranium deuteride core,[2]: 202  meant to explore deuterated polyethylene mixed with uranium as thermonuclear fuel,[16]: chap.15 [2]: 203  and if successful to lead also to a compact thermonuclear primary.[2]: 149  Predicted yield was 1.5 to 3 kilotons, max. theoretical was 20 kt.[15]: 96  Device fizzled - deuterium moderated (slowed-down) neutrons more than expected and quenched the reaction. Embarrassing for designers, as it left 200 ft (61 m) of tower still standing (see image of tower).
Dixie April 6, 1953 15:29:38.4 PST (-8 hrs)
 NTS Area 7

37°05′05″N 116°01′08″W / 37.0847°N 116.0189°W / 37.0847; -116.0189 (Dixie)

1,284 m (4,213 ft)
+ 1,830 m (6,000 ft) 		free air drop,
weapons development 		MK-5D

"DD-1"[2]: 194 

11 kt I-131 detected, 1.7 MCi (63 PBq) [10][11][12][13][14] TX-5D proof test, a boosting experiment using lithium deuteride in solid or crystalline form, investigating initiation via deuterium; a cheap method to initiate a chain reaction.[2]: 185  Exploded 600 ft (180 m) ENE of intended zero point.
Ray April 11, 1953 12:44:59.8 PST (-8 hrs)
 NTS Area 4

37°05′56″N 116°05′36″W / 37.09889°N 116.09332°W / 37.09889; -116.09332 (Ray)

1,296 m (4,252 ft)
+ 30 m (98 ft) 		tower,
weapons development 		MK-6[15]: 198 

"Hydride II"

220 t[17]: 101  I-131 detected, 28 kCi (1,000 TBq) [10][11][13][14] 2nd UCRL device, uranium deuteride[2]: 202  meant to explore deuterated polyethylene mixed with uranium as thermonuclear fuel,[16]: chap.15 [2]: 203  and if successful to lead also to a compact thermonuclear primary;[2]: 149  Used different mix from Ruth[2]: 202  and it also fizzled. A 100-foot tower was apparently used to avoid embarrassment in case of fizzle.
Badger April 18, 1953 12:35:00.0 PST (-8 hrs)
 NTS Area 2

37°08′18″N 116°07′07″W / 37.1383°N 116.1187°W / 37.1383; -116.1187 (Badger)

1,370 m (4,490 ft)
+ 90 m (300 ft) 		tower,
weapons development 		TX-16 "Buzzard" 23 kt I-131 detected, 3.6 MCi (130 PBq) [10][11][12][13][14] Component test of the TX-16 using a cryogenic mockup secondary and the TX-16 radiation case. Also tested RACER primary, which performed below expectations again. Desert Rock V.
Simon April 25, 1953 12:29:59.8 PST (-8 hrs)
 NTS Area 1

37°03′11″N 116°06′13″W / 37.053°N 116.1036°W / 37.053; -116.1036 (Simon)

1,294 m (4,245 ft)
+ 90 m (300 ft) 		tower,
weapons development 		TX-17/24 "Simultaneity" 43 kt I-131 detected, 6.3 MCi (230 PBq) [10][11][12][13][14] Component test of TX-17/24 series using the RACER IV primary, a modified RACER core containing two additional kilograms of HEU in the original design tested in Nancy, a thermonuclear secondary mockup.[11]
Encore May 8, 1953 15:29:55.4 PST (-8 hrs)
 NTS Area 5

36°48′00″N 115°55′44″W / 36.8°N 115.929°W / 36.8; -115.929 (Encore)

940 m (3,080 ft)
+ 740 m (2,430 ft) 		free air drop,
weapon effect 		MK-6D 27 kt I-131 detected, 3.9 MCi (140 PBq) [10][11][12][13][14] "Effects" test. Dropped 950 ft (290 m) SSW of target. Desert Rock V, bad exposures for troops and bad downwinder fallout.
Harry May 19, 1953 12:04:59.5 PST (-8 hrs)
 NTS Area 3

37°02′25″N 116°01′34″W / 37.0402°N 116.0261°W / 37.0402; -116.0261 (Harry)

1,224 m (4,016 ft)
+ 90 m (300 ft) 		tower,
weapons development 		TX-13D "Hamlet" 32 kt I-131 detected, 4.6 MCi (170 PBq) [10][11][12][13][14] New hollow core design, most efficient pure-plutonium device under 100 kt indicates very good compression. Major effects testing of a high elevation explosion. Heaviest downwind contamination measured.
Grable May 25, 1953 15:30:00.3 PST (-8 hrs)
 Launch from NTS Areas 5, 11, Frenchman Flat: 5

36°42′15″N 115°58′26″W / 36.70428°N 115.97387°W / 36.70428; -115.97387 (Launch_Grable), elv: 950 + 5 m (3,117 + 16 ft);
Detonation over NTS 36°47′35″N 115°54′56″W / 36.793°N 115.9156°W / 36.793; -115.9156 (Grable)

960 m (3,150 ft)
+ 160 m (520 ft) 		gun deployed,
weapon effect 		W9 AFAP "Gun" 15 kt I-131 detected, 2.1 MCi (78 PBq) [10][11][12][13][14] The 2nd of four gun-type device tests. Fired from the M65 Atomic Cannon "Atomic Annie" 11 km (6.8 mi) downrange. 280mm shell, 365 kg (805 lb). Detonation at 200 feet (61 m) SW of target. Desert Rock V. Major effects test.
Climax June 4, 1953 11:14:56.7 PST (-8 hrs)
 NTS Area 7

37°05′15″N 116°01′09″W / 37.0875°N 116.0192°W / 37.0875; -116.0192 (Climax)

1,288 m (4,226 ft)
+ 410 m (1,350 ft) 		free air drop,
weapons development 		MK-7, "Cobra", Type D pit 61 kt I-131 detected, 8.6 MCi (320 PBq) [10][11][12][13][14] Proof test of a boosted MK-7 device, intended to be used as a primary in Castle. Initially it was intended only for the TX-15[2]: 195 . After RACER's inconsistent behaviour it was opted for all "emergency capability" devices instead.[2]: 197 . The bomb detonated 320 ft (98 m) NW of target. Composite implosion system in a Type D pit. Used Cyclotol 75/25 explosive mixture.
  1. ^ The US, France and Great Britain have code-named their test events, while the USSR and China did not, and therefore have only test numbers (with some exceptions – Soviet peaceful explosions were named). Word translations into English in parentheses unless the name is a proper noun. A dash followed by a number indicates a member of a salvo event. The US also sometimes named the individual explosions in such a salvo test, which results in "name1 – 1(with name2)". If test is canceled or aborted, then the row data like date and location discloses the intended plans, where known.
  2. ^ To convert the UT time into standard local, add the number of hours in parentheses to the UT time; for local daylight saving time, add one additional hour. If the result is earlier than 00:00, add 24 hours and subtract 1 from the day; if it is 24:00 or later, subtract 24 hours and add 1 to the day. Historical time zone data obtained from the IANA time zone database.
  3. ^ Rough place name and a latitude/longitude reference; for rocket-carried tests, the launch location is specified before the detonation location, if known. Some locations are extremely accurate; others (like airdrops and space blasts) may be quite inaccurate. "~" indicates a likely pro-forma rough location, shared with other tests in that same area.
  4. ^ Elevation is the ground level at the point directly below the explosion relative to sea level; height is the additional distance added or subtracted by tower, balloon, shaft, tunnel, air drop or other contrivance. For rocket bursts the ground level is "N/A". In some cases it is not clear if the height is absolute or relative to ground, for example, Plumbbob/John. No number or units indicates the value is unknown, while "0" means zero. Sorting on this column is by elevation and height added together.
  5. ^ Atmospheric, airdrop, balloon, gun, cruise missile, rocket, surface, tower, and barge are all disallowed by the Partial Nuclear Test Ban Treaty. Sealed shaft and tunnel are underground, and remained useful under the PTBT. Intentional cratering tests are borderline; they occurred under the treaty, were sometimes protested, and generally overlooked if the test was declared to be a peaceful use.
  6. ^ Include weapons development, weapon effects, safety test, transport safety test, war, science, joint verification and industrial/peaceful, which may be further broken down.
  7. ^ Designations for test items where known, "?" indicates some uncertainty about the preceding value, nicknames for particular devices in quotes. This category of information is often not officially disclosed.
  8. ^ Estimated energy yield in tons, kilotons, and megatons. A ton of TNT equivalent is defined as 4.184 gigajoules (1 gigacalorie).
  9. ^ Radioactive emission to the atmosphere aside from prompt neutrons, where known. The measured species is only iodine-131 if mentioned, otherwise it is all species. No entry means unknown, probably none if underground and "all" if not; otherwise notation for whether measured on the site only or off the site, where known, and the measured amount of radioactivity released.
[edit]
  • Full uncut detonation of Upshot-Knothole Grable, launched out of the Atomic Annie device on 5/25/1953. The footage at normal speed is about 2+1⁄2 minutes.
    Full uncut detonation of Upshot-Knothole Grable, launched out of the Atomic Annie device on 5/25/1953. The footage at normal speed is about 2+1⁄2 minutes.
  • Close-up slow motion shot of Grable fire-ball, mach-stem and surface effects,
    Close-up slow motion shot of Grable fire-ball, mach-stem and surface effects,
  • Upshot-Knothole Encore, 27-kilotons.
    Upshot-Knothole Encore, 27-kilotons.
  • Upshot-Knothole Ruth, 0.2-kilotons.
    Upshot-Knothole Ruth, 0.2-kilotons.
  • Upshot-Knothole Ruth, Note close proximity to highway in foreground as to the scale of detonation.
    Upshot-Knothole Ruth, Note close proximity to highway in foreground as to the scale of detonation.
  • The mangled tower for the Ruth test. The explosion failed to level the testing tower, only somewhat damaging it.
    The mangled tower for the Ruth test. The explosion failed to level the testing tower, only somewhat damaging it.
  • Upshot-Knothole Badger, 23 Kilotons
    Upshot-Knothole Badger, 23 Kilotons
  • Upshot-Knothole Harry, 32 Kilotons
    Upshot-Knothole Harry, 32 Kilotons
  • Encore's Mushroom Cloud from far away
    Encore's Mushroom Cloud from far away
  • Encore's Mushroom Cloud
    Encore's Mushroom Cloud
  • Upshot-Knothole Nancy, 24 Kilotons
    Upshot-Knothole Nancy, 24 Kilotons
  • Upshot-Knothole Dixie, 11 Kilotons
    Upshot-Knothole Dixie, 11 Kilotons
  • Upshot-Knothole Ray, 220 Tons
  • Upshot-Knothole Simon, 43 Kilotons
    Upshot-Knothole Simon, 43 Kilotons
  • Grable's Mushroom Cloud
    Grable's Mushroom Cloud
  • Upshot-Knothole Annie, 16 Kilotons
    Upshot-Knothole Annie, 16 Kilotons
  • Badger's Mushroom Cloud
    Badger's Mushroom Cloud

References

[edit]
Notes
  1. ^ Apparently the device name is a misnomer, as it implies that the device tested was related to the TX-15 "ZOMBIE". However, this is not the case; no thermonuclear component testing of TX-15 appears to have been conducted during this operation, since Upshot-Knothole tested radiation implosion mockups, containing primaries and mocked-up secondaries with small amounts of enriched Li-6 for the TX-14, TX-16, and TX-17/24 thermonuclear prototype systems, all slated to be proof-fired during CASTLE.[2]: 193 
Citations
  1. ^ Operation UPSHOT-KNOTHOLE Fact Sheet (PDF) (Report). Defense Threat Reduction Agency.Archived February 18, 2013, at the Wayback Machine
  2. ^ a b c d e f g h i j k l m n o p q r Hansen, Chuck (1995). Swords of Armageddon. Vol. III. Retrieved December 28, 2016.
  3. ^ Olvera, Lorena. "'Atomic Mom' Filmmaker Reveals Secret Stories of the Bomb". UCLA Asia Pacific Center. Retrieved December 6, 2024.
  4. ^ Rogin, Leo; DuPont, Alden C; Weeber, Christian G. Operation Upshot-Knothole. Project 5.1. Atomic Weapon Effects on AD Type Aircraft in Flight (Report). NAVAL AIR MATERIAL CENTER PHILADELPHIAPA. p. 25. Retrieved September 30, 2023.
  5. ^ Operation Upshot-Knothole. Project 5.1. Atomic Weapon Effects on AD Type Aircraft in Flight, p. 28.
  6. ^ Operation Upshot-Knothole. Project 5.1. Atomic Weapon Effects on AD Type Aircraft in Flight, p. 32.
  7. ^ Operation Upshot-Knothole. Project 5.1. Atomic Weapon Effects on AD Type Aircraft in Flight, p. 36.
  8. ^ Operation Upshot-Knothole. Project 5.1. Atomic Weapon Effects on AD Type Aircraft in Flight, p. 41.
  9. ^ "Time Zone Historical Database". iana.com. Retrieved March 8, 2014.
  10. ^ a b c d e f g h i j k Estimated exposures and thyroid doses received by the American people from Iodine-131 in fallout following Nevada atmospheric nuclear bomb tests, Chapter 2 (PDF), National Cancer Institute, 1997, retrieved January 5, 2014
  11. ^ a b c d e f g h i j k l Sublette, Carey, Nuclear Weapons Archive, retrieved January 6, 2014
  12. ^ a b c d e f g h i Hansen, Chuck (1995), The Swords of Armageddon, Vol. 8, Sunnyvale, CA: Chukelea Publications, ISBN 978-0-9791915-1-0
  13. ^ a b c d e f g h i j k United States Nuclear Tests: July 1945 through September 1992 (PDF) (DOE/NV-209 REV15), Las Vegas, NV: Department of Energy, Nevada Operations Office, December 1, 2000, archived from the original (PDF) on October 12, 2006, retrieved December 18, 2013
  14. ^ a b c d e f g h i j k Yang, Xiaoping; North, Robert; Romney, Carl (August 2000), CMR Nuclear Explosion Database (Revision 3), SMDC Monitoring Research
  15. ^ a b c Hansen, Chuck (1995). Swords of Armageddon. Vol. VII. Retrieved December 28, 2016.
  16. ^ a b Herken, Gregg (2003). Brotherhood of the Bomb.
  17. ^ Operation Upshot-Knothole Summary Report of the Technical Director. 1953. Retrieved February 17, 2019.
Bibliography
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