Isotopes of bismuth

Bismuth (₈₃Bi) has 41 known isotopes, ranging from ¹⁸⁴Bi to ²²⁴Bi. Bismuth has no stable isotopes, but does have one naturally occurring, very long-lived isotope; thus, the standard atomic weight can be given from that isotope, bismuth-209. Though it is now known to be radioactive, it may still be considered practically stable because it has a half-life of 2.01×10¹⁹ years, which is more than a billion times the age of the universe.

Besides ²⁰⁹Bi, the most stable bismuth radioisotopes are ^210mBi with a half-life of 3.04 million years, ²⁰⁸Bi with a half-life of 368,000 years and ²⁰⁷Bi, with a half-life of 31.22 years, none of which occur in nature. All other isotopes have half-lives under 15 days, most under two hours. Of naturally occurring radioisotopes, the most stable is radiogenic ²¹⁰Bi with a half-life of 5.012 days. ^210mBi is unusual for being a nuclear isomer with a half-life many orders of magnitude longer than that of the ground state.

List of isotopes

|-id=Bismuth-184 | ¹⁸⁴Bi | | style="text-align:right" | 83 | style="text-align:right" | 101 | 184.00135(13)# | | α | ¹⁸⁰Tl | 3+# | |-id=Bismuth-184m | style="text-indent:1em" | ^184mBi | | colspan="3" style="text-indent:2em" | 150(100)#&nbsp;keV | | α | ¹⁸⁰Tl | 10−# | |-id=Bismuth-185 | rowspan=2|¹⁸⁵Bi | rowspan=2| | rowspan=2 style="text-align:right" | 83 | rowspan=2 style="text-align:right" | 102 | rowspan=2|184.99760(9)# | rowspan=2| | p (92%) | ¹⁸⁴Pb | rowspan=2|(1/2+) | rowspan=2| |- | α (8%) | ¹⁸¹Tl |-id=Bismuth-185m | style="text-indent:1em" | ^185mBi | | colspan="3" style="text-indent:2em" | 70(50)#&nbsp;keV | | IT | ¹⁸⁵Bi | (7/2−, 9/2−) | |-id=Bismuth-186 | rowspan=3|¹⁸⁶Bi | rowspan=3| | rowspan=3 style="text-align:right" | 83 | rowspan=3 style="text-align:right" | 103 | rowspan=3|185.996623(18) | rowspan=3| | α (99.99%) | ¹⁸²Tl | rowspan=3|(3+) | rowspan=3| |- | β⁺ (?%) | ¹⁸⁶Pb |- | β⁺, SF (0.011%) | (various) |-id=Bismuth-186m | rowspan=3 style="text-indent:1em" | ^186mBi | rowspan=3| | rowspan=3 colspan="3" style="text-indent:2em" | 170(100)#&nbsp;keV | rowspan=3| | α (99.99%) | ¹⁸²Tl | rowspan=3|(10−) | rowspan=3| |- | β⁺ (?%) | ¹⁸⁶Pb |- | β⁺, SF (0.011%) | (various) |-id=Bismuth-187 | ¹⁸⁷Bi | | style="text-align:right" | 83 | style="text-align:right" | 104 | 186.993147(11) | | α | ¹⁸³Tl | (9/2−) | |-id=Bismuth-187m1 | style="text-indent:1em" | ^187m1Bi | | colspan="3" style="text-indent:2em" | | | α | ¹⁸³Tl | 1/2+ | |-id=Bismuth-187m2 | style="text-indent:1em" | ^187m2Bi | | colspan="3" style="text-indent:2em" | | | IT | ¹⁸⁷Bi | (13/2+) | |-id=Bismuth-188 | rowspan=2|¹⁸⁸Bi | rowspan=2| | rowspan=2 style="text-align:right" | 83 | rowspan=2 style="text-align:right" | 105 | rowspan=2|187.992276(12) | rowspan=2| | α | ¹⁸⁴Tl | rowspan=2|(3+) | rowspan=2| |- | β⁺, SF (0.0014%) | (various) |-id=Bismuth-188m1 | style="text-indent:1em" | ^188m1Bi | | colspan="3" style="text-indent:2em" | | | | | 7+# | |-id=Bismuth-188m2 | rowspan=2 style="text-indent:1em" | ^188m2Bi | rowspan=2| | rowspan=2 colspan="3" style="text-indent:2em" | | rowspan=2| | α | ¹⁸⁴Tl | rowspan=2|(10−) | rowspan=2| |- | β⁺, SF (0.0046%) | (various) |-id=Bismuth-189 | ¹⁸⁹Bi | | style="text-align:right" | 83 | style="text-align:right" | 106 | 188.989195(22) | | α | ¹⁸⁵Tl | 9/2− | |-id=Bismuth-189m1 | rowspan=2 style="text-indent:1em" | ^189m1Bi | rowspan=2| | rowspan=2 colspan="3" style="text-indent:2em" | | rowspan=2| | α (83%) | ¹⁸⁵Tl | rowspan=2|1/2+ | rowspan=2| |- | IT (17%) | ¹⁸⁹Bi |-id=Bismuth-189m2 | style="text-indent:1em" | ^189m2Bi | | colspan="3" style="text-indent:2em" | | | IT | ¹⁸⁹Bi | 13/2+ | |-id=Bismuth-190 | rowspan=3|¹⁹⁰Bi | rowspan=3| | rowspan=3 style="text-align:right" | 83 | rowspan=3 style="text-align:right" | 107 | rowspan=3|189.988625(23) | rowspan=3| | α (77%) | ¹⁸⁶Tl | rowspan=3|(3+) | rowspan=3| |- | β⁺ (23%) | ¹⁹⁰Pb |- | β⁺, SF (6×10^{−6}%) | (various) |-id=Bismuth-190m1 | rowspan=3 style="text-indent:1em" | ^190m1Bi | rowspan=3| | rowspan=3 colspan="3" style="text-indent:2em" | | rowspan=3| | α (70%) | ¹⁸⁶Tl | rowspan=3|10− | rowspan=3| |- | β⁺ (30%) | ¹⁹⁰Pb |- | β⁺, SF (4×10^{−6}%) | (various) |-id=Bismuth-190m2 | style="text-indent:1em" | ^190m2Bi | | colspan="3" style="text-indent:2em" | | | IT | ¹⁹⁰Bi | (5−) | |-id=Bismuth-190m3 | style="text-indent:1em" | ^190m3Bi | | colspan="3" style="text-indent:2em" | | | IT | ¹⁹⁰Bi | (8−) | |-id=Bismuth-191 | rowspan=2|¹⁹¹Bi | rowspan=2| | rowspan=2 style="text-align:right" | 83 | rowspan=2 style="text-align:right" | 108 | rowspan=2|190.985787(8) | rowspan=2| | α (51%) | ¹⁸⁷Tl | rowspan=2|9/2− | rowspan=2| |- | β⁺ (49%) | ¹⁹¹Pb |-id=Bismuth-191m1 | rowspan=3 style="text-indent:1em" | ^191m1Bi | rowspan=3| | rowspan=3 colspan="3" style="text-indent:2em" | | rowspan=3| | α (68%) | ¹⁸⁷Tl | rowspan=3|1/2+ | rowspan=3| |- | IT (?%) | ¹⁹¹Bi |- | β⁺ (?%) | ¹⁹¹Pb |-id=Bismuth-191m2 | style="text-indent:1em" | ^191m2Bi | | colspan="3" style="text-indent:2em" | | | IT | ¹⁹¹Bi | 13/2+ | |-id=Bismuth-191m3 | style="text-indent:1em" | ^191m3Bi | | colspan="3" style="text-indent:2em" | 1875(25)#&nbsp;keV | | IT | ¹⁹¹Bi | 25/2-# | |-id=Bismuth-192 | rowspan=2|¹⁹²Bi | rowspan=2| | rowspan=2 style="text-align:right" | 83 | rowspan=2 style="text-align:right" | 109 | rowspan=2|191.98547(3) | rowspan=2| | β⁺ (88%) | ¹⁹²Pb | rowspan=2|(3+) | rowspan=2| |- | α (12%) | ¹⁸⁸Tl |-id=Bismuth-192m | rowspan=2 style="text-indent:1em" | ^192mBi | rowspan=2| | rowspan=2 colspan="3" style="text-indent:2em" | | rowspan=2| | β⁺ (90%) | ¹⁹²Pb | rowspan=2|10− | rowspan=2| |- | α (10%) | ¹⁸⁸Tl |-id=Bismuth-193 | rowspan=2|¹⁹³Bi | rowspan=2| | rowspan=2 style="text-align:right" | 83 | rowspan=2 style="text-align:right" | 110 | rowspan=2|192.982947(8) | rowspan=2| | β⁺ (96.5%) | ¹⁹³Pb | rowspan=2|9/2− | rowspan=2| |- | α (3.5%) | ¹⁸⁹Tl |-id=Bismuth-193m1 | rowspan=2 style="text-indent:1em" | ^193m1Bi | rowspan=2| | rowspan=2 colspan="3" style="text-indent:2em" | | rowspan=2| | α (84%) | ¹⁸⁹Tl | rowspan=2|1/2+ | rowspan=2| |- | β⁺ (16%) | ¹⁹³Pb |-id=Bismuth-193m2 | style="text-indent:1em" | ^193m2Bi | | colspan="3" style="text-indent:2em" | | | IT | ¹⁹³Bi | 13/2+ | |-id=Bismuth-193m3 | style="text-indent:1em" | ^193m3Bi | | colspan="3" style="text-indent:2em" | | | IT | ¹⁹³Bi | 29/2+ | |-id=Bismuth-193m4 | style="text-indent:1em" | ^193m4Bi | | colspan="3" style="text-indent:2em" | | | IT | ¹⁹³Bi | (29/2−) | |-id=Bismuth-194 | rowspan=2|¹⁹⁴Bi | rowspan=2| | rowspan=2 style="text-align:right" | 83 | rowspan=2 style="text-align:right" | 111 | rowspan=2|193.982799(6) | rowspan=2| | β⁺ (99.54%) | ¹⁹⁴Pb | rowspan=2|3+ | rowspan=2| |- | α (0.46%) | ¹⁹⁰Tl |-id=Bismuth-194m1 | style="text-indent:1em" | ^194m1Bi | | colspan="3" style="text-indent:2em" | | | β⁺ | ¹⁹⁴Pb | (6+, 7+) | |-id=Bismuth-194m2 | rowspan=2 style="text-indent:1em" | ^194m2Bi | rowspan=2| | rowspan=2 colspan="3" style="text-indent:2em" | | rowspan=2| | β⁺ (99.80%) | ¹⁹⁴Pb | rowspan=2|(10−) | rowspan=2| |- | α (0.20%) | ¹⁹⁰Tl |-id=Bismuth-195 | rowspan=2|¹⁹⁵Bi | rowspan=2| | rowspan=2 style="text-align:right" | 83 | rowspan=2 style="text-align:right" | 112 | rowspan=2|194.980649(6) | rowspan=2| | β⁺ (99.97%) | ¹⁹⁵Pb | rowspan=2|9/2− | rowspan=2| |- | α (0.030%) | ¹⁹¹Tl |-id=Bismuth-195m1 | rowspan=2 style="text-indent:1em" | ^195m1Bi | rowspan=2| | rowspan=2 colspan="3" style="text-indent:2em" | | rowspan=2| | β⁺ (67%) | ¹⁹⁵Pb | rowspan=2|1/2+ | rowspan=2| |- | α (33%) | ¹⁹¹Tl |-id=Bismuth-195m2 | style="text-indent:1em" | ^195m2Bi | | colspan="3" style="text-indent:2em" | | | IT | ¹⁹⁵Bi | (29/2−) | |-id=Bismuth-195m3 | style="text-indent:1em" | ^195m3Bi | | colspan="3" style="text-indent:2em" | | | IT | ¹⁹⁵Bi | 29/2+ | |-id=Bismuth-196 | rowspan=2|¹⁹⁶Bi | rowspan=2| | rowspan=2 style="text-align:right" | 83 | rowspan=2 style="text-align:right" | 113 | rowspan=2|195.980667(26) | rowspan=2| | β⁺ | ¹⁹⁶Pb | rowspan=2|(3+) | rowspan=2| |- | α (0.00115%) | ¹⁹²Tl |-id=Bismuth-196m1 | style="text-indent:1em" | ^196m1Bi | | colspan="3" style="text-indent:2em" | | | IT | ¹⁹⁶Bi | (7+) | |-id=Bismuth-196m2 | rowspan=3 style="text-indent:1em" | ^196m2Bi | rowspan=3| | rowspan=3 colspan="3" style="text-indent:2em" | | rowspan=3| | β⁺ (74.2%) | ¹⁹⁶Pb | rowspan=3| (10−) | rowspan=3| |- | IT (25.8%) | ¹⁹⁶Bi |- | α (3.8×10^{−4}%) | ¹⁹⁶Bi |-id=Bismuth-197 | ¹⁹⁷Bi | | style="text-align:right" | 83 | style="text-align:right" | 114 | 196.978865(9) | | β⁺ | ¹⁹⁷Pb | 9/2− | |-id=Bismuth-197m1 | rowspan=2 style="text-indent:1em" | ^197m1Bi | rowspan=2| | rowspan=2 colspan="3" style="text-indent:2em" | | rowspan=2| | α (55%) | ¹⁹³Tl | rowspan=2|1/2+ | rowspan=2| |- | β⁺ (45%) | ¹⁹⁷Pb |-id=Bismuth-197m2 | style="text-indent:1em" | ^197m2Bi | | colspan="3" style="text-indent:2em" | | | IT | ¹⁹⁷Bi | (29/2−) | |-id=Bismuth-197m3 | style="text-indent:1em" | ^197m3Bi | | colspan="3" style="text-indent:2em" | | | IT | ¹⁹⁷Bi | (31/2−) | |-id=Bismuth-198 | ¹⁹⁸Bi | | style="text-align:right" | 83 | style="text-align:right" | 115 | 197.979201(30) | | β⁺ | ¹⁹⁸Pb | 3+ | |-id=Bismuth-198m1 | style="text-indent:1em" | ^198m1Bi | | colspan="3" style="text-indent:2em" | | | β⁺ | ¹⁹⁸Pb | 7+ | |-id=Bismuth-198m2 | style="text-indent:1em" | ^198m2Bi | | colspan="3" style="text-indent:2em" | | | IT | ¹⁹⁸Bi | 10− | |-id=Bismuth-199 | ¹⁹⁹Bi | | style="text-align:right" | 83 | style="text-align:right" | 116 | 198.977673(11) | | β⁺ | ¹⁹⁹Pb | 9/2− | |-id=Bismuth-199m1 | rowspan=3 style="text-indent:1em" | ^199m1Bi | rowspan=3| | rowspan=3 colspan="3" style="text-indent:2em" | | rowspan=3| | β⁺ (>98%) | ¹⁹⁹Pb | rowspan=3|(1/2+) | rowspan=3| |- | IT (<2%) | ¹⁹⁹Bi |- | α (0.01%) | ¹⁹⁵Tl |-id=Bismuth-199m2 | style="text-indent:1em" | ^199m2Bi | | colspan="3" style="text-indent:2em" | | | IT | ¹⁹⁹Bi | 25/2+# | |-id=Bismuth-199m3 | style="text-indent:1em" | ^199m3Bi | | colspan="3" style="text-indent:2em" | | | IT | ¹⁹⁹Bi | 29/2−# | |-id=Bismuth-200 | ²⁰⁰Bi | | style="text-align:right" | 83 | style="text-align:right" | 117 | 199.978131(24) | | β⁺ | ²⁰⁰Pb | 7+ | |-id=Bismuth-200m1 | rowspan=2 style="text-indent:1em" | ^200m1Bi | rowspan=2| | rowspan=2 colspan="3" style="text-indent:2em" | 100(70)#&nbsp;keV | rowspan=2| | β⁺ (?%) | ²⁰⁰Pb | rowspan=2|(2+) | rowspan=2| |- | IT (?%) | ²⁰⁰Bi |-id=Bismuth-200m2 | style="text-indent:1em" | ^200m2Bi | | colspan="3" style="text-indent:2em" | | | IT | ²⁰⁰Bi | (10−) | |-id=Bismuth-201 | ²⁰¹Bi | | style="text-align:right" | 83 | style="text-align:right" | 118 | 200.976995(13) | | β⁺ | ²⁰¹Pb | 9/2− | |-id=Bismuth-201m1 | rowspan=2 style="text-indent:1em" | ^201m1Bi | rowspan=2| | rowspan=2 colspan="3" style="text-indent:2em" | | rowspan=2| | β⁺ | ²⁰¹Pb | rowspan=2|1/2+ | rowspan=2| |- | α (?%) | ¹⁹⁷Tl |-id=Bismuth-201m2 | style="text-indent:1em" | ^201m2Bi | | colspan="3" style="text-indent:2em" | | | IT | ²⁰¹Bi | 25/2+# | |-id=Bismuth-201m3 | style="text-indent:1em" | ^201m3Bi | | colspan="3" style="text-indent:2em" | | | IT | ²⁰¹Bi | 27/2+# | |-id=Bismuth-201m4 | style="text-indent:1em" | ^201m4Bi | | colspan="3" style="text-indent:2em" | | | IT | ²⁰¹Bi | 29/2−# | |-id=Bismuth-202 | rowspan=2|²⁰²Bi | rowspan=2| | rowspan=2 style="text-align:right" | 83 | rowspan=2 style="text-align:right" | 119 | rowspan=2|201.977723(15) | rowspan=2| | β⁺ | ²⁰²Pb | rowspan=2|5+ | rowspan=2| |- | α (<10^{−5}%) | ¹⁹⁸Tl |-id=Bismuth-202m1 | style="text-indent:1em" | ^202m1Bi | | colspan="3" style="text-indent:2em" | | | IT | ²⁰²Bi | 10−# | |-id=Bismuth-202m2 | style="text-indent:1em" | ^202m2Bi | | colspan="3" style="text-indent:2em" | | | IT | ²⁰²Bi | (17+) | |-id=Bismuth-203 | ²⁰³Bi | | style="text-align:right" | 83 | style="text-align:right" | 120 | 202.976892(14) | | β⁺ | ²⁰³Pb | 9/2− | |-id=Bismuth-203m1 | style="text-indent:1em" | ^203m1Bi | | colspan="3" style="text-indent:2em" | | | IT | ²⁰³Bi | 1/2+ | |-id=Bismuth-203m2 | style="text-indent:1em" | ^203m2Bi | | colspan="3" style="text-indent:2em" | | | IT | ²⁰³Bi | 25/2+ | |-id=Bismuth-204 | ²⁰⁴Bi | | style="text-align:right" | 83 | style="text-align:right" | 121 | 203.977836(10) | | β⁺ | ²⁰⁴Pb | 6+ | |-id=Bismuth-204m1 | style="text-indent:1em" | ^204m1Bi | | colspan="3" style="text-indent:2em" | | | IT | ²⁰⁴Bi | 10− | |-id=Bismuth-204m2 | style="text-indent:1em" | ^204m2Bi | | colspan="3" style="text-indent:2em" | | | IT | ²⁰⁴Bi | 17+ | |-id=Bismuth-205 | ²⁰⁵Bi | | style="text-align:right" | 83 | style="text-align:right" | 122 | 204.977385(5) | | β⁺ | ²⁰⁵Pb | 9/2− | |-id=Bismuth-205m1 | style="text-indent:1em" | ^205m1Bi | | colspan="3" style="text-indent:2em" | | | IT | ²⁰⁵Bi | 1/2+ | |-id=Bismuth-205m2 | style="text-indent:1em" | ^205m2Bi | | colspan="3" style="text-indent:2em" | | | IT | ²⁰⁵Bi | 21/2+ | |-id=Bismuth-205m3 | style="text-indent:1em" | ^205m3Bi | | colspan="3" style="text-indent:2em" | | | IT | ²⁰⁵Bi | 25/2+ | |-id=Bismuth-206 | ²⁰⁶Bi | | style="text-align:right" | 83 | style="text-align:right" | 123 | 205.978499(8) | | β⁺ | ²⁰⁶Pb | 6+ | |-id=Bismuth-206m1 | style="text-indent:1em" | ^206m1Bi | | colspan="3" style="text-indent:2em" | | | IT | ²⁰⁶Bi | 4+ | |-id=Bismuth-206m2 | style="text-indent:1em" | ^206m2Bi | | colspan="3" style="text-indent:2em" | | | IT | ²⁰⁶Bi | 10− | |-id=Bismuth-206m3 | style="text-indent:1em" | ^206m3Bi | | colspan="3" style="text-indent:2em" | | | IT | ²⁰⁶Bi | (28−) | |-id=Bismuth-206m4 | style="text-indent:1em" | ^206m4Bi | | colspan="3" style="text-indent:2em" | | | IT | ²⁰⁶Bi | (31+) | |-id=Bismuth-207 | ²⁰⁷Bi | | style="text-align:right" | 83 | style="text-align:right" | 124 | 206.9784706(26) | | β⁺ | ²⁰⁷Pb | 9/2− | |-id=Bismuth-207m | style="text-indent:1em" | ^207mBi | | colspan="3" style="text-indent:2em" | | | IT | ²⁰⁷Bi | 21/2+ | |-id=Bismuth-208 | ²⁰⁸Bi | | style="text-align:right" | 83 | style="text-align:right" | 125 | 207.9797421(25) | | β⁺ | ²⁰⁸Pb | 5+ | |-id=Bismuth-208m | style="text-indent:1em" | ^208mBi | | colspan="3" style="text-indent:2em" | | | IT | ²⁰⁸Bi | 10− | |- | ²⁰⁹Bi<br/> | | style="text-align:right" | 83 | style="text-align:right" | 126 | 208.9803986(15) | | α | ²⁰⁵Tl | 9/2− | 1.0000 |-id=Bismuth-210 | rowspan=2|²¹⁰Bi | rowspan=2|Radium E | rowspan=2 style="text-align:right" | 83 | rowspan=2 style="text-align:right" | 127 | rowspan=2|209.9841202(15) | rowspan=2| | β^− | ²¹⁰Po | rowspan=2|1− | rowspan=2|Trace |- | α (1.32×10^{−4}%) | ²⁰⁶Tl |-id=Bismuth-210m | style="text-indent:1em" | ^210mBi | | colspan="3" style="text-indent:2em" | | | α | ²⁰⁶Tl | 9− | |-id=Bismuth-211 | rowspan=2|²¹¹Bi | rowspan=2|Actinium C | rowspan=2 style="text-align:right" | 83 | rowspan=2 style="text-align:right" | 128 | rowspan=2|210.987269(6) | rowspan=2| | α (99.72%) | ²⁰⁷Tl | rowspan=2|9/2− | rowspan=2|Trace |- | β^− (0.276%) | ²¹¹Po |-id=Bismuth-211m | style="text-indent:1em" | ^211mBi | | colspan="3" style="text-indent:2em" | | | IT | ²¹¹Bi | (25/2−) | |-id=Bismuth-212 | rowspan=3|²¹²Bi | rowspan=3|Thorium C | rowspan=3 style="text-align:right" | 83 | rowspan=3 style="text-align:right" | 129 | rowspan=3|211.9912850(20) | rowspan=3| | β^− (64.05%) | ²¹²Po | rowspan=3|1− | rowspan=3|Trace |- | α (35.94%) | ²⁰⁸Tl |- | β^−, α (0.014%) | ²⁰⁸Pb |-id=Bismuth-212m1 | rowspan=3 style="text-indent:1em" | ^212m1Bi | rowspan=3| | rowspan=3 colspan="3" style="text-indent:2em" | | rowspan=3| | α (67%) | ²⁰⁸Tl | rowspan=3|(8−, 9−) | rowspan=3| |- | β^−, α (30%) | ²⁰⁸Pb |- | β^− (3%) | ²¹²Po |-id=Bismuth-212m2 | style="text-indent:1em" | ^212m2Bi | | colspan="3" style="text-indent:2em" | | | β^− | ²¹²Po | (18−) | |- | rowspan=2|²¹³Bi<br/> | rowspan=2| | rowspan=2 style="text-align:right" | 83 | rowspan=2 style="text-align:right" | 130 | rowspan=2|212.994384(5) | rowspan=2| | β^− (97.91%) | ²¹³Po | rowspan=2|9/2− | rowspan=2|Trace |- | α (2.09%) | ²⁰⁹Tl |-id=Bismuth-213m | style="text-indent:1em" | ^213mBi | | colspan="3" style="text-indent:2em" | | | | | 25/2−# | |-id=Bismuth-214 | rowspan=3|²¹⁴Bi | rowspan=3|Radium C | rowspan=3 style="text-align:right" | 83 | rowspan=3 style="text-align:right" | 131 | rowspan=3|213.998711(12) | rowspan=3| | β^− (99.98%) | ²¹⁴Po | rowspan=3|1− | rowspan=3|Trace |- | α (0.021%) | ²¹⁰Tl |- | β^−, α (0.003%) | ²¹⁰Pb |-id=Bismuth-214m | style="text-indent:1em" | ^214mBi | | colspan="3" style="text-indent:2em" | | | | | 8−# | |-id=Bismuth-215 | ²¹⁵Bi | | style="text-align:right" | 83 | style="text-align:right" | 132 | 215.001749(6) | | β^− | ²¹⁵Po | (9/2−) | Trace |-id=Bismuth-215m | rowspan=2 style="text-indent:1em" | ^215mBi | rowspan=2| | rowspan=2 colspan="3" style="text-indent:2em" | 1367(20)#&nbsp;keV | rowspan=2| | IT (76.9%) | ²¹⁵Bi | rowspan=2| (25/2−) | rowspan=2| |- | β^− (23.1%) | ²¹⁵Po |-id=Bismuth-216 | ²¹⁶Bi | | style="text-align:right" | 83 | style="text-align:right" | 133 | 216.006306(12) | | β^− | ²¹⁶Po | (6−, 7−) | |-id=Bismuth-216m | style="text-indent:1em" | ^216mBi | | colspan="3" style="text-indent:2em" | | | β^− | ²¹⁶Po | 3−# | |-id=Bismuth-217 | ²¹⁷Bi | | style="text-align:right" | 83 | style="text-align:right" | 134 | 217.009372(19) | | β^− | ²¹⁷Po | 9/2−# | |-id=Bismuth-217m | style="text-indent:1em" | ^217mBi | | colspan="3" style="text-indent:2em" | | | IT | ²¹⁷Bi | 25/2−# | |-id=Bismuth-218 | ²¹⁸Bi | | style="text-align:right" | 83 | style="text-align:right" | 135 | 218.014188(29) | | β^− | ²¹⁸Po | 8−# | |-id=Bismuth-219 | ²¹⁹Bi | | style="text-align:right" | 83 | style="text-align:right" | 136 | 219.01752(22)# | | β^− | ²¹⁹Po | 9/2−# | |-id=Bismuth-220 | ²²⁰Bi | | style="text-align:right" | 83 | style="text-align:right" | 137 | 220.02250(32)# | | β^− | ²²⁰Po | 1−# | |-id=Bismuth-221 | ²²¹Bi | | style="text-align:right" | 83 | style="text-align:right" | 138 | 221.02598(32)# | [>300&nbsp;ns] | | | 9/2−# | |-id=Bismuth-222 | ²²²Bi | | style="text-align:right" | 83 | style="text-align:right" | 139 | 222.03108(32)# | [>300&nbsp;ns] | | | 1−# | |-id=Bismuth-223 | ²²³Bi | | style="text-align:right" | 83 | style="text-align:right" | 140 | 223.03461(43)# | [>300&nbsp;ns] | | | 9/2−# | |-id=Bismuth-224 | ²²⁴Bi | | style="text-align:right" | 83 | style="text-align:right" | 141 | 224.03980(43)# | [>300&nbsp;ns] | | | 1−# |

Bismuth-213

Bismuth-213 (²¹³Bi) has a half-life of 45.6 minutes and decays mainly by beta emission to polonium-213; with only 2.1% going via alpha emission to thallium-209; however, as the polonium instantly decays by alpha, one alpha particle is emitted per atom. The amounts needed for medical use are always produced through its decay chain (the neptunium series) from either thorium-229 (limited supply due to the long life of that isotope) or actinium-225, which can be produced directly from radium-226, for example by bombardment with bremsstrahlung photons from a linear particle accelerator, knocking out a neutron and through beta decay giving actinium-225.

In 1997, an antibody conjugate with ²¹³Bi was used to treat patients with leukemia, and this isotope has otherwise been used in targeted alpha therapy (TAT) to treat a variety of cancers.

Bismuth-213 is also produced in the decay of uranium-233, the fuel bred by thorium reactors, but as mentioned this goes through the long-lived thorium-229, so the production rates from each reactor will not be large.

See also

Daughter products other than bismuth

• Isotopes of polonium
• Isotopes of lead
• Isotopes of thallium

References