Isotopes of tungsten

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Template:Short description Template:Infobox tungsten isotopes Naturally occurring tungsten (74W) consists of five isotopes. Four are considered stable (182W, 183W, 184W, and 186W) and one is slightly radioactive, 180W, with an extremely long half-life of Template:Val.[1] On average, two alpha decays of 180W occur per gram of natural tungsten per year, so for most practical purposes, 180W can be considered stable. Theoretically, all five naturally occurring isotopes of tungsten can decay into isotopes of hafnium (element 72) by alpha emission, but only 180W has been observed to do so. The other naturally occurring isotopes have not been observed to decay (they are observationally stable), and lower bounds for their half-lives have been established:

182W, t1/2 > 7.7×1021 years
183W, t1/2 > 4.1×1021 years
184W, t1/2 > 8.9×1021 years
186W, t1/2 > 8.2×1021 years

Thirty-four artificial radioisotopes of tungsten have been characterized with mass numbers ranging from 156 to 194, the most stable of which are 181W with a half-life of 121.2 days, 185W with a half-life of 75.1 days, 188W with a half-life of 69.4 days and 178W with a half-life of 21.6 days. All of the remaining radioactive isotopes have half-lives of less than 24 hours, and most of these have half-lives that are less than 8 minutes. Tungsten also has twelve known meta states, the most stable being 179m1W (t1/2 6.4 minutes).

List of isotopes

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Template:Isotopes table |-id=Tungsten-156 | 156W[2] | style="text-align:right" | 74 | style="text-align:right" | 82 | | Template:Val | β+ | 156Ta | 0+ | | |-id=Tungsten-157 | 157W[3] | style="text-align:right" | 74 | style="text-align:right" | 83 | 156.97886(43)# | 275(40) ms | β+ | 157Ta | (7/2−) | |

|-id=Tungsten-158 | 158W | style="text-align:right" | 74 | style="text-align:right" | 84 | 157.97457(32)# | 1.43(18) ms | α | 154Hf | 0+ | | |-id=Tungsten-158m | style="text-indent:1em" | 158mW | colspan="3" style="text-indent:2em" | 1889(8) keV | 143(19) μs | α | 154Hf | (8+) | | |-id=Tungsten-159 | 159W | style="text-align:right" | 74 | style="text-align:right" | 85 | 158.97270(32)# | 8.2(7) ms | α (82%) | 155Hf | 7/2−# | | |-id=Tungsten-160 | rowspan=2|160W | rowspan=2 style="text-align:right" | 74 | rowspan=2 style="text-align:right" | 86 | rowspan=2|159.96851(16) | rowspan=2|90(5) ms | α (87%) | 156Hf | rowspan=2|0+ | rowspan=2| | rowspan=2| |- | β+ (13%) | 160Ta |-id=Tungsten-161 | rowspan=2|161W | rowspan=2 style="text-align:right" | 74 | rowspan=2 style="text-align:right" | 87 | rowspan=2|160.96725(22)# | rowspan=2|409(16) ms | α (73%) | 157Hf | rowspan=2|7/2−# | rowspan=2| | rowspan=2| |- | β+ (27%) | 161Ta |-id=Tungsten-162 | rowspan=2|162W | rowspan=2 style="text-align:right" | 74 | rowspan=2 style="text-align:right" | 88 | rowspan=2|161.963500(19) | rowspan=2|1.19(12) s | β+ (54.8%) | 162Ta | rowspan=2|0+ | rowspan=2| | rowspan=2| |- | α (45.2%) | 158Hf |-id=Tungsten-163 | rowspan=2|163W | rowspan=2 style="text-align:right" | 74 | rowspan=2 style="text-align:right" | 89 | rowspan=2|162.962524(63) | rowspan=2|2.63(9) s | β+ (86%) | 163Ta | rowspan=2|7/2− | rowspan=2| | rowspan=2| |- | α (14%) | 159Hf |-id=Tungsten-163m | style="text-indent:1em" | 163mW | colspan="3" style="text-indent:2em" | 480.3(7) keV | 154(3) ns | IT | 163W | 13/2+ | | |-id=Tungsten-164 | rowspan=2|164W | rowspan=2 style="text-align:right" | 74 | rowspan=2 style="text-align:right" | 90 | rowspan=2|163.958952(10) | rowspan=2|6.3(2) s | β+ (96.2%) | 164Ta | rowspan=2|0+ | rowspan=2| | rowspan=2| |- | α (3.8%) | 160Hf |-id=Tungsten-165 | 165W | style="text-align:right" | 74 | style="text-align:right" | 91 | 164.958281(28) | 5.1(5) s | β+ | 165Ta | (5/2−) | | |-id=Tungsten-166 | rowspan=2|166W | rowspan=2 style="text-align:right" | 74 | rowspan=2 style="text-align:right" | 92 | rowspan=2|165.955032(10) | rowspan=2|19.2(6) s | β+ (99.97%) | 166Ta | rowspan=2|0+ | rowspan=2| | rowspan=2| |- | α (0.035%) | 162Hf |-id=Tungsten-167 | rowspan=2|167W | rowspan=2 style="text-align:right" | 74 | rowspan=2 style="text-align:right" | 93 | rowspan=2|166.954811(20) | rowspan=2|19.9(5) s | β+ (99.96%) | 167Ta | rowspan=2|(5/2−) | rowspan=2| | rowspan=2| |- | α (0.04%) | 163Hf |-id=Tungsten-168 | rowspan=2|168W | rowspan=2 style="text-align:right" | 74 | rowspan=2 style="text-align:right" | 94 | rowspan=2|167.951805(14) | rowspan=2|50.9(19) s | β+ (99.97%) | 168Ta | rowspan=2|0+ | rowspan=2| | rowspan=2| |- | α (0.032%) | 164Hf |-id=Tungsten-169 | 169W | style="text-align:right" | 74 | style="text-align:right" | 95 | 168.951779(17) | 74(6) s | β+ | 169Ta | 5/2−# | | |-id=Tungsten-170 | 170W | style="text-align:right" | 74 | style="text-align:right" | 96 | 169.949231(14) | 2.42(4) min | β+(99%) | 170Ta | 0+ | | |-id=Tungsten-171 | 171W | style="text-align:right" | 74 | style="text-align:right" | 97 | 170.949451(30) | 2.38(4) min | β+ | 171Ta | (5/2−) | | |-id=Tungsten-172 | 172W | style="text-align:right" | 74 | style="text-align:right" | 98 | 171.947292(30) | 6.6(9) min | β+ | 172Ta | 0+ | | |-id=Tungsten-173 | 173W | style="text-align:right" | 74 | style="text-align:right" | 99 | 172.947689(30) | 7.6(2) min | β+ | 173Ta | 5/2− | | |-id=Tungsten-174 | 174W | style="text-align:right" | 74 | style="text-align:right" | 100 | 173.946079(30) | 33.2(21) min | β+ | 174Ta | 0+ | | |-id=Tungsten-174m1 | style="text-indent:1em" | 174m1W | colspan="3" style="text-indent:2em" | 2267.8(4) keV | 158(3) ns | IT | 174W | 8− | | |-id=Tungsten-174m2 | style="text-indent:1em" | 174m2W | colspan="3" style="text-indent:2em" | 3515.6(4) keV | 128(8) ns | IT | 174W | 12+ | | |-id=Tungsten-175 | 175W | style="text-align:right" | 74 | style="text-align:right" | 101 | 174.946717(30) | 35.2(6) min | β+ | 175Ta | (1/2−) | | |-id=Tungsten-175m | style="text-indent:1em" | 175mW | colspan="3" style="text-indent:2em" | 234.96(15) keV | 216(6) ns | IT | 175W | (7/2+) | | |-id=Tungsten-176 | 176W | style="text-align:right" | 74 | style="text-align:right" | 102 | 175.945634(30) | 2.5(1) h | EC | 176Ta | 0+ | | |-id=Tungsten-177 | 177W | style="text-align:right" | 74 | style="text-align:right" | 103 | 176.946643(30) | 132.4(20) min | β+ | 177Ta | 1/2− | | |-id=Tungsten-178 | 178W | style="text-align:right" | 74 | style="text-align:right" | 104 | 177.945886(16) | 21.6(3) d | EC | 178Ta | 0+ | | |-id=Tungsten-178m | style="text-indent:1em" | 178mW | colspan="3" style="text-indent:2em" | 6572.7(3) keV | 220(10) ns | IT | 178W | 25+ | | |-id=Tungsten-179 | 179W | style="text-align:right" | 74 | style="text-align:right" | 105 | 178.947079(16) | 37.05(16) min | β+ | 179Ta | 7/2− | | |-id=Tungsten-179m1 | rowspan=2 style="text-indent:1em" | 179m1W | rowspan=2 colspan="3" style="text-indent:2em" | 221.91(3) keV | rowspan=2|6.40(7) min | IT (99.71%) | 179W | rowspan=2|1/2− | rowspan=2| | rowspan=2| |- | β+ (0.29%) | 179Ta |-id=Tungsten-179m2 | style="text-indent:1em" | 179m2W | colspan="3" style="text-indent:2em" | 1631.90(8) keV | 390(30) ns | IT | 179W | 21/2+ | | |-id=Tungsten-179m3 | style="text-indent:1em" | 179m3W | colspan="3" style="text-indent:2em" | 3348.41(14) keV | 750(80) ns | IT | 179W | 35/2− | | |-id=Tungsten-180 | 180W[n 1] | style="text-align:right" | 74 | style="text-align:right" | 106 | 179.9467133(15) | 1.59(5)×1018 y[1] | α | 176Hf | 0+ | 0.0012(1) | |-id=Tungsten-180m1 | style="text-indent:1em" | 180m1W | colspan="3" style="text-indent:2em" | 1529.05(4) keV | 5.47(9) ms | IT | 180W | 8− | | |-id=Tungsten-180m2 | style="text-indent:1em" | 180m2W | colspan="3" style="text-indent:2em" | 3264.7(3) keV | 2.33(19) μs | IT | 180W | 14− | | |-id=Tungsten-181 | 181W | style="text-align:right" | 74 | style="text-align:right" | 107 | 180.9482187(16) | 120.956(19) d | EC | 181Ta | 9/2+ | | |-id=Tungsten-181m1 | style="text-indent:1em" | 181m1W | colspan="3" style="text-indent:2em" | 365.55(13) keV | 14.59(15) μs | IT | 181W | 5/2− | | |-id=Tungsten-181m2 | style="text-indent:1em" | 181m2W | colspan="3" style="text-indent:2em" | 1653.0(3) keV | 200(13) ns | IT | 181W | 21/2+ | | |-id=Tungsten-182 | 182W | style="text-align:right" | 74 | style="text-align:right" | 108 | 181.94820564(80) | colspan=3 align=center|Observationally Stable[n 2] | 0+ | 0.2650(16) | |-id=Tungsten-182m | style="text-indent:1em" | 182mW | colspan="3" style="text-indent:2em" | 2230.65(14) keV | 1.3(1) μs | IT | 182W | 10+ | | |-id=Tungsten-183 | 183W | style="text-align:right" | 74 | style="text-align:right" | 109 | 182.95022442(80) | colspan=3 align=center|Observationally Stable[n 3] | 1/2− | 0.1431(4) | |-id=Tungsten-183m | style="text-indent:1em" | 183mW | colspan="3" style="text-indent:2em" | 309.492(4) keV | 5.30(8) s | IT | 183W | 11/2+ | | |-id=Tungsten-184 | 184W | style="text-align:right" | 74 | style="text-align:right" | 110 | 183.95093318(79) | colspan=3 align=center|Observationally Stable[n 4] | 0+ | 0.3064(2) | |-id=Tungsten-184m1 | style="text-indent:1em" | 184m1W | colspan="3" style="text-indent:2em" | 1284.997(8) keV | 8.33(18) μs | IT | 184W | 5− | | |-id=Tungsten-184m2 | style="text-indent:1em" | 184m2W | colspan="3" style="text-indent:2em" | 4127.7(5) keV | 188(38) ns | IT | 184W | (14+) | | |-id=Tungsten-185 | 185W | style="text-align:right" | 74 | style="text-align:right" | 111 | 184.95342121(79) | 75.1(3) d | β− | 185Re | 3/2− | | |-id=Tungsten-185m | style="text-indent:1em" | 185mW | colspan="3" style="text-indent:2em" | 197.383(23) keV | 1.597(4) min | IT | 185W | 11/2+ | | |-id=Tungsten-186 | 186W | style="text-align:right" | 74 | style="text-align:right" | 112 | 185.9543651(13) | colspan=3 align=center|Observationally Stable[n 5] | 0+ | 0.2843(19) | |-id=Tungsten-186m1 | style="text-indent:1em" | 186m1W | colspan="3" style="text-indent:2em" | 1517.2(6) keV | 18(1) μs | IT | 186W | 7− | | |-id=Tungsten-186m2 | style="text-indent:1em" | 186m2W | colspan="3" style="text-indent:2em" | 3542.8(21) keV | 2.0(2) s | IT | 186W | 16+ | | |-id=Tungsten-187 | 187W | style="text-align:right" | 74 | style="text-align:right" | 113 | 186.9571612(13) | 23.809(25) h | β− | 187Re | 3/2− | | |-id=Tungsten-187m | style="text-indent:1em" | 187mW | colspan="3" style="text-indent:2em" | 410.06(4) keV | Template:Val[4] | IT | 187W | 11/2+ | | |-id=Tungsten-188 | 188W | style="text-align:right" | 74 | style="text-align:right" | 114 | 187.9584883(33) | 69.77(5) d | β− | 188Re | 0+ | | |-id=Tungsten-188m | style="text-indent:1em" | 188mW | colspan="3" style="text-indent:2em" | 1926.7(8) keV | 109.5(35) ns | IT | 188W | 8− | | |-id=Tungsten-189 | 189W | style="text-align:right" | 74 | style="text-align:right" | 115 | 188.96156(22)# | 11.6(2) min | β− | 189Re | 9/2−# | | |-id=Tungsten-190 | 190W | style="text-align:right" | 74 | style="text-align:right" | 116 | 189.963104(38) | 30.0(15) min | β− | 190Re | 0+ | | |-id=Tungsten-190m1 | style="text-indent:1em" | 190m1W | colspan="3" style="text-indent:2em" | 1743.6(10) keV | 111(17) ns | IT | 190W | 8+ | | |-id=Tungsten-190m2 | style="text-indent:1em" | 190m2W | colspan="3" style="text-indent:2em" | 1840.6(14) keV | 166(6) μs | IT | 190W | 10− | | |-id=Tungsten-191 | 191W | style="text-align:right" | 74 | style="text-align:right" | 117 | 190.966531(45) | 14# s
[>300 ns] | | | 3/2−# | | |-id=Tungsten-191m | style="text-indent:1em" | 191mW | colspan="3" style="text-indent:2em" | 235(10)# keV | 340(14) ns | IT | 191W | 9/2−# | | |-id=Tungsten-192 | 192W | style="text-align:right" | 74 | style="text-align:right" | 118 | 191.96820(22)# | 40# s
[>300 ns] | | | 0+ | | |-id=Tungsten-193 | 193W | style="text-align:right" | 74 | style="text-align:right" | 119 | 192.97188(22)# | 30# s
[>300 ns] | | | 1/2−# | | |-id=Tungsten-194 | 194W | style="text-align:right" | 74 | style="text-align:right" | 120 | 193.97380(32)# | 20# s
[>300 ns] | | | 0+ | | |-id=Tungsten-195 | 195W | style="text-align:right" | 74 | style="text-align:right" | 121 | 194.97774(32)# | 30# s
[>160 ns] | | | 3/2−# | | |-id=Tungsten-196 | 196W | style="text-align:right" | 74 | style="text-align:right" | 122 | 195.97988(43)# | 25# s
[>300 ns] | | | 0+ | | |-id=Tungsten-197 | 197W | style="text-align:right" | 74 | style="text-align:right" | 123 | 196.98404(43)# | 1# s
[>300 ns] | | | 5/2−# | | Template:Isotopes table/footer

See also

Daughter products other than tungsten

References

Template:Reflist

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