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[ 0 => '{{more footnotes|date=August 2017}}', 1 => '{{infobox sodium isotopes}}', 2 => 'There are 21 recognized isotopes of [[sodium]] (₁₁Na), ranging from {{chem|18|Na}} to {{chem|39|Na}}<ref name=riken51>{{cite report |last=Ahn |first=D.S. |display-authors=etal |title=New isotope of ³⁹Na and the neutron dripline of neon isotopes using a 345 MeV/nucleon ⁴⁸Ca beam |series=RIKEN Accelerator Progress Reports |volume=51 |pages=82 |date=2018 |url=https://www.nishina.riken.jp/researcher/APR/APR051/pdf/82.pdf}}</ref> and two [[nuclear isomer|isomer]]s ({{chem|22m|Na}} and {{chem|24m|Na}}). {{chem|23|Na}} is the only stable (and the only primordial) isotope. It is considered a monoisotopic element and it has a [[standard atomic weight]] of {{val|22.98976928|(2)}}. Sodium has two [[radioactive]] [[Cosmogenic nuclide|cosmogenic]] isotopes ({{chem|22|Na}}, [[half-life]] = 2.605 years; and {{chem|link=Sodium-24|24|Na}}, half-life ≈ 15 hours). With the exception of those two, all other isotopes have [[half-life|half-lives]] under a minute, most under a second. The shortest-lived is {{chem|18|Na}}, with a half-life of {{val|1.3|(4)|e=-21}} seconds.', 3 => '', 4 => 'Acute neutron radiation exposure (e.g., from a nuclear [[criticality accident]]) converts some of the stable {{chem|23|Na}} in human blood plasma to {{chem|24|Na}}. By measuring the concentration of this isotope, the neutron radiation dosage to the victim can be computed.', 5 => '', 6 => '{{chem|22|Na}} is a [[positron]]-emitting isotope with a remarkably long half-life. It is used to create test-objects and point-sources for [[positron emission tomography]].', 7 => '', 8 => '== List of isotopes ==', 9 => '{{Isotopes table', 10 => '|symbol=Na', 11 => '|refs=NUBASE2016, AME2016 II<!-- was updated as of 2019-07-15) -->', 12 => '|notes=m, unc(), mass#, hl#, spin(), spin#, daughter-st, n, p, IT', 13 => '}}', 14 => '|-', 15 => '| rowspan=2|¹⁸Na', 16 => '| rowspan=2 style="text-align:right" | 11', 17 => '| rowspan=2 style="text-align:right" | 7', 18 => '| rowspan=2|{{val|18.02688|(10)}}', 19 => '| rowspan=2|{{val|1.3|(4)|e=-21|u=s}}', 20 => '| [[proton emission|p]]', 21 => '| ¹⁷Ne', 22 => '| rowspan=2|(1−)#', 23 => '| rowspan=2|', 24 => '| rowspan=2|', 25 => '|-', 26 => '| [[Beta decay|β⁺]] (<.1%)', 27 => '| ¹⁸Ne', 28 => '|-', 29 => '| ¹⁹Na', 30 => '| style="text-align:right" | 11', 31 => '| style="text-align:right" | 8', 32 => '| {{val|19.013880|(11)}}', 33 => '| >{{val|10|e=-18|u=s}}', 34 => '| p', 35 => '| ¹⁸Ne', 36 => '| (5/2+)', 37 => '|', 38 => '|', 39 => '|-', 40 => '| rowspan=2|²⁰Na', 41 => '| rowspan=2 style="text-align:right" | 11', 42 => '| rowspan=2 style="text-align:right" | 9', 43 => '| rowspan=2|{{val|20.0073544|(12)}}', 44 => '| rowspan=2|447.9(23)&nbsp;ms', 45 => '| β⁺ (75%)', 46 => '| '''²⁰Ne'''', 47 => '| rowspan=2|2+', 48 => '| rowspan=2|', 49 => '| rowspan=2|', 50 => '|-', 51 => '| β⁺, [[alpha decay|α]] (25%)', 52 => '| '''¹⁶O'''', 53 => '|-', 54 => '| ²¹Na', 55 => '| style="text-align:right" | 11', 56 => '| style="text-align:right" | 10', 57 => '| {{val|20.99765470|(11)}}', 58 => '| 22.422(10) s', 59 => '| β⁺', 60 => '| '''²¹Ne'''', 61 => '| 3/2+', 62 => '| ', 63 => '| ', 64 => '|-', 65 => '| ²²Na', 66 => '| style="text-align:right" | 11', 67 => '| style="text-align:right" | 11', 68 => '| {{val|21.99443742|(18)}}', 69 => '| 2.6018(22)&nbsp;y', 70 => '| β⁺', 71 => '| '''²²Ne'''', 72 => '| 3+', 73 => '| Trace<ref group="n" name="t">[[Cosmogenic nuclide]]</ref>', 74 => '|', 75 => '|-', 76 => '| style="text-indent:1em" | ^22m1Na', 77 => '| colspan="3" style="text-indent:2em" | 583.03(9)&nbsp;keV', 78 => '| 243(2)&nbsp;ns', 79 => '| [[Isomeric transition|IT]]', 80 => '| ²²Na', 81 => '| 1+', 82 => '|', 83 => '|', 84 => '|-', 85 => '| style="text-indent:1em" | ^22m2Na', 86 => '| colspan="3" style="text-indent:2em" | 657.00(14)&nbsp;keV', 87 => '| 19.6(7)&nbsp;ps', 88 => '| IT', 89 => '| ²²Na', 90 => '| 0+', 91 => '|', 92 => '|', 93 => '|-', 94 => '| ²³Na', 95 => '| style="text-align:right" | 11', 96 => '| style="text-align:right" | 12', 97 => '| {{val|22.9897692820|(19)}}', 98 => '| colspan=3 align=center|'''Stable'''', 99 => '| 3/2+', 100 => '| {{val|1.0000}}', 101 => '|', 102 => '|-', 103 => '| [[#Sodium-24|²⁴Na]]', 104 => '| style="text-align:right" | 11', 105 => '| style="text-align:right" | 13', 106 => '| {{val|23.990963011|(18)}}', 107 => '| {{val|14.957|(4)|u=h}}', 108 => '| β⁻', 109 => '| '''²⁴Mg'''', 110 => '| 4+', 111 => '| Trace<ref group="n" name="t" />', 112 => '|', 113 => '|-', 114 => '| rowspan=2 style="text-indent:1em" | ^24mNa', 115 => '| rowspan=2 colspan="3" style="text-indent:2em" | 472.207(9)&nbsp;keV', 116 => '| rowspan=2|20.18(10)&nbsp;ms', 117 => '| IT (99.95%)', 118 => '| ²⁴Na', 119 => '| rowspan=2|1+', 120 => '| rowspan=2|', 121 => '| rowspan=2|', 122 => '|-', 123 => '| β⁻ (.05%)', 124 => '| '''²⁴Mg'''', 125 => '|-', 126 => '| ²⁵Na', 127 => '| style="text-align:right" | 11', 128 => '| style="text-align:right" | 14', 129 => '| {{val|24.9899540|(13)}}', 130 => '| 59.1(6) s', 131 => '| β⁻', 132 => '| '''²⁵Mg'''', 133 => '| 5/2+', 134 => '|', 135 => '|', 136 => '|-', 137 => '| ²⁶Na', 138 => '| style="text-align:right" | 11', 139 => '| style="text-align:right" | 15', 140 => '| {{val|25.992635|(4)}}', 141 => '| 1.07128(25) s', 142 => '| β⁻', 143 => '| '''²⁶Mg'''', 144 => '| 3+', 145 => '|', 146 => '|', 147 => '|-', 148 => '| style="text-indent:1em" | ^26mNa', 149 => '| colspan="3" style="text-indent:2em" | 82.5(6)&nbsp;keV', 150 => '| 9(2)&nbsp;µs', 151 => '| IT', 152 => '| ²⁶Na', 153 => '| 1+', 154 => '|', 155 => '|', 156 => '|-', 157 => '| rowspan=2|²⁷Na', 158 => '| rowspan=2 style="text-align:right" | 11', 159 => '| rowspan=2 style="text-align:right" | 16', 160 => '| rowspan=2| {{val|26.994076|(4)}}', 161 => '| rowspan=2| 301(6)&nbsp;ms', 162 => '| β⁻ (99.87%)', 163 => '| ²⁷Mg', 164 => '| rowspan=2|5/2+', 165 => '| rowspan=2|', 166 => '| rowspan=2|', 167 => '|-', 168 => '| β⁻, [[neutron emission|n]] (0.13%)', 169 => '| '''²⁶Mg'''', 170 => '|-', 171 => '| rowspan=2|²⁸Na', 172 => '| rowspan=2 style="text-align:right" | 11', 173 => '| rowspan=2 style="text-align:right" | 17', 174 => '| rowspan=2|{{val|27.998939|(11)}}', 175 => '| rowspan=2|30.5(4)&nbsp;ms', 176 => '| β⁻ (99.42%)', 177 => '| ²⁸Mg', 178 => '| rowspan=2|1+', 179 => '| rowspan=2|', 180 => '| rowspan=2|', 181 => '|-', 182 => '| β⁻, n (0.58%)', 183 => '| ²⁷Mg', 184 => '|-', 185 => '| rowspan=2|²⁹Na', 186 => '| rowspan=2 style="text-align:right" | 11', 187 => '| rowspan=2 style="text-align:right" | 18', 188 => '| rowspan=2|{{val|29.002877|(8)}}', 189 => '| rowspan=2|44.1(9)&nbsp;ms', 190 => '| β⁻ (74.1%)', 191 => '| ²⁹Mg', 192 => '| rowspan=2|3/2(+#)', 193 => '| rowspan=2|', 194 => '| rowspan=2|', 195 => '|-', 196 => '| β⁻, n (25.9%)', 197 => '| ²⁸Mg', 198 => '|-', 199 => '| rowspan=4|³⁰Na', 200 => '| rowspan=4 style="text-align:right" | 11', 201 => '| rowspan=4 style="text-align:right" | 19', 202 => '| rowspan=4|{{val|30.009098|(5)}}', 203 => '| rowspan=4|48.4(17)&nbsp;ms', 204 => '| β⁻ (68.85%)', 205 => '| ³⁰Mg', 206 => '| rowspan=4|2+', 207 => '| rowspan=4|', 208 => '| rowspan=4|', 209 => '|-', 210 => '| β⁻, n (30.0%)', 211 => '| ²⁹Mg', 212 => '|-', 213 => '| β⁻, 2n (1.15%)', 214 => '| ²⁸Mg', 215 => '|-', 216 => '| β⁻, α (5.5×10⁻⁵%)', 217 => '| ²⁶Ne', 218 => '|-', 219 => '| rowspan=4|³¹Na', 220 => '| rowspan=4 style="text-align:right" | 11', 221 => '| rowspan=4 style="text-align:right" | 20', 222 => '| rowspan=4|{{val|31.013147|(15)}}', 223 => '| rowspan=4|17.35(40)&nbsp;ms', 224 => '| β⁻ (61.78%)', 225 => '| ³¹Mg', 226 => '| rowspan=4|(3/2+)', 227 => '| rowspan=4|', 228 => '| rowspan=4|', 229 => '|-', 230 => '| β⁻, n (37.3%)', 231 => '| ³⁰Mg', 232 => '|-', 233 => '| β⁻, 2n (0.87%)', 234 => '| ²⁹Mg', 235 => '|-', 236 => '| β⁻, 3n (0.05%)', 237 => '| ²⁸Mg', 238 => '|-', 239 => '| rowspan=3|³²Na', 240 => '| rowspan=3 style="text-align:right" | 11', 241 => '| rowspan=3 style="text-align:right" | 21', 242 => '| rowspan=3|{{val|32.02001|(4)}}', 243 => '| rowspan=3|12.9(3)&nbsp;ms', 244 => '| β⁻ (68%)', 245 => '| ³²Mg', 246 => '| rowspan=3|(3−)', 247 => '| rowspan=3|', 248 => '| rowspan=3|', 249 => '|-', 250 => '| β⁻, n (24%)', 251 => '| ³¹Mg', 252 => '|-', 253 => '| β⁻, 2n (8%)', 254 => '| ³⁰Mg', 255 => '|-', 256 => '| rowspan=3|³³Na', 257 => '| rowspan=3 style="text-align:right" | 11', 258 => '| rowspan=3 style="text-align:right" | 22', 259 => '| rowspan=3|{{val|33.02553|(48)}}', 260 => '| rowspan=3|8.2(4)&nbsp;ms', 261 => '| β⁻, n (47%)', 262 => '| ³²Mg', 263 => '| rowspan=3|(3/2+)', 264 => '| rowspan=3|', 265 => '| rowspan=3|', 266 => '|-', 267 => '| β⁻ (40%)', 268 => '| ³³Mg', 269 => '|-', 270 => '| β⁻, 2n (13%)', 271 => '| ³¹Mg', 272 => '|-', 273 => '| rowspan=3|³⁴Na', 274 => '| rowspan=3 style="text-align:right" | 11', 275 => '| rowspan=3 style="text-align:right" | 23', 276 => '| rowspan=3|{{val|34.03401|(64)}}', 277 => '| rowspan=3|5.5(10)&nbsp;ms', 278 => '| β⁻, 2n (50.0%)', 279 => '| ³²Mg', 280 => '| rowspan=3|1+', 281 => '| rowspan=3|', 282 => '| rowspan=3|', 283 => '|-', 284 => '| β⁻ (35.0%)', 285 => '| ³⁴Mg', 286 => '|-', 287 => '| β⁻, n (15.0%)', 288 => '| ³³Mg', 289 => '|-', 290 => '| ³⁵Na', 291 => '| style="text-align:right" | 11', 292 => '| style="text-align:right" | 24', 293 => '| {{val|35.04104|(72)}}#', 294 => '| 1.5(5)&nbsp;ms', 295 => '| β⁻', 296 => '| ³⁵Mg', 297 => '| 3/2+#', 298 => '| ', 299 => '| ', 300 => '<!--|-', 301 => '| ³⁶Na', 302 => '| style="text-align:right" | 11', 303 => '| style="text-align:right" | 25', 304 => '| 36.05148(102)#', 305 => '| <260&nbsp;ns', 306 => '|', 307 => '|', 308 => '|', 309 => '|', 310 => '|-->', 311 => '|-', 312 => '| ³⁷Na', 313 => '| style="text-align:right" | 11', 314 => '| style="text-align:right" | 26', 315 => '| {{val|37.05747|(74)}}#', 316 => '| 1#&nbsp;ms [>1.5&nbsp;µs]', 317 => '| β⁻, n', 318 => '| ³⁶Mg', 319 => '| 3/2+#', 320 => '|', 321 => '|', 322 => '|-', 323 => '| ³⁹Na<ref name=riken51/>', 324 => '| style="text-align:right" | 11', 325 => '| style="text-align:right" | 28', 326 => '|', 327 => '|', 328 => '| β⁻, n (#)', 329 => '| ³⁸Mg', 330 => '|', 331 => '|', 332 => '|', 333 => '{{Isotopes table/footer}}', 334 => '', 335 => '==Sodium-24==', 336 => 'Sodium-24 is one of the most important isotopes. It is [[radioactive]] and created from common sodium-23 by [[neutron]] bombardment. With a 15-hour half life, {{chem|24|Na}} decays to {{chem|link=Isotopes of magnesium|24|Mg}} by emission of an [[electron]] and two [[gamma ray]]s. Exposure of the human body to intense neutron flux creates {{chem|24|Na}} in [[blood plasma]]. Measurements of its quantity are used to determine the absorbed radiation dose of the patient. This is used to determine the level of medical treatment required.', 337 => '', 338 => 'When the [[NaK|sodium-potassium]] alloy is used as a coolant in nuclear reactors, {{chem|24|Na}} is created, which makes the coolant radioactive. When the {{chem|24|Na}} decays, it causes a buildup of magnesium in the coolant. Since the half life is short, the {{chem|24|Na}} portion of the coolant ceases to be radioactive within a few days after removal from the reactor.', 339 => '', 340 => '==Sodium-22==', 341 => 'Sodium-22 is being investigated as an efficient generator of “cold [[positrons]]” ([[antimatter]]) to produce [[muons]] for catalyzing [[Muon-catalyzed fusion|fusion of deuterium]].', 342 => '', 343 => '== References ==', 344 => '{{reflist}}', 345 => '', 346 => '==External links==', 347 => '*[https://web.archive.org/web/20070712011829/http://ie.lbl.gov/education/parent/Na_iso.htm Sodium isotopes data from ''The Berkeley Laboratory Isotopes Project's'']', 348 => '', 349 => '{{Navbox element isotopes}}', 350 => '', 351 => '[[Category:Sodium]]', 352 => '[[Category:Isotopes of sodium| ]]', 353 => '[[Category:Lists of isotopes by element|Sodium]]' ]