# Isotopes of bismuth

Bismuth ($_{83}$Bi) has 41 known isotopes, ranging from $^{184}$Bi to $^{224}$Bi. Bismuth has no stable isotopes, but does have one very long-lived isotope; thus, the standard atomic weight can be given as 208.98040(1). Although bismuth-209 is now known to be radioactive, it has classically been considered to be a stable isotope because it has a half-life of approximately 2.01×10$^{19}$ years, which is more than a billion times the age of the universe. Besides $^{209}$Bi, the most stable bismuth radioisotopes are $^{210m}$Bi with a half-life of 3.04 million years, $^{208}$Bi with a half-life of 368,000 years and $^{207}$Bi, with a half-life of 32.9 years, none of which occur in nature. All other isotopes have half-lives under 1 year, most under a day. Of naturally occurring radioisotopes, the most stable is radiogenic $^{210}$Bi with a half-life of 5.012 days. $^{210m}$Bi is unusual for being a nuclear isomer with a half-life multiple orders of magnitude longer than that of the ground state.

## List of isotopes

| Nuclide | Historic name | Z | N | Isotopic mass (Da) | Half-life | Decay mode | Daughter isotope | Spin and parity | Isotopic abundance |
| Isotopic abundance |||
| $^{184}$Bi | | 83 | 101 | 184.00135(13)# | 6.6(15) ms | α | $^{180}$Tl | 3+# | |
| $^{184m}$Bi | | 150(100)# keV | 150(100)# keV | 150(100)# keV | 13(2) ms | α | $^{180}$Tl | 10−# | |
| $^{185}$Bi | | 83 | 102 | 184.99760(9)# | 2.8+2.3 −1.0 μs | p (92%) | $^{184}$Pb | (1/2+) | |
| $^{185}$Bi | | 83 | 102 | 184.99760(9)# | 2.8+2.3 −1.0 μs | α (8%) | $^{181}$Tl | (1/2+) | |
| $^{185m}$Bi | | 70(50)# keV | 70(50)# keV | 70(50)# keV | 58(2) μs | IT | $^{185}$Bi | (7/2−, 9/2−) | |
| $^{186}$Bi | | 83 | 103 | 185.996623(18) | 14.8(7) ms | α (99.99%) | $^{182}$Tl | (3+) | |
| $^{186}$Bi | | 83 | 103 | 185.996623(18) | 14.8(7) ms | β$^+$ (?%) | $^{186}$Pb | (3+) | |
| $^{186}$Bi | | 83 | 103 | 185.996623(18) | 14.8(7) ms | β$^+$, SF (0.011%) | (various) | (3+) | |
| $^{186m}$Bi | | 170(100)# keV | 170(100)# keV | 170(100)# keV | 9.8(4) ms | α (99.99%) | $^{182}$Tl | (10−) | |
| $^{186m}$Bi | | 170(100)# keV | 170(100)# keV | 170(100)# keV | 9.8(4) ms | β$^+$ (?%) | $^{186}$Pb | (10−) | |
| $^{186m}$Bi | | 170(100)# keV | 170(100)# keV | 170(100)# keV | 9.8(4) ms | β$^+$, SF (0.011%) | (various) | (10−) | |
| $^{187}$Bi | | 83 | 104 | 186.993147(11) | 37(2) ms | α | $^{183}$Tl | (9/2−) | |
| $^{187m1}$Bi | | 108(8) keV | 108(8) keV | 108(8) keV | 370(20) μs | α | $^{183}$Tl | 1/2+ | |
| $^{187m2}$Bi | | 252(3) keV | 252(3) keV | 252(3) keV | 7(5) μs | IT | $^{187}$Bi | (13/2+) | |
| $^{188}$Bi | | 83 | 105 | 187.992276(12) | 60(3) ms | α | $^{184}$Tl | (3+) | |
| $^{188}$Bi | | 83 | 105 | 187.992276(12) | 60(3) ms | β$^+$, SF (0.0014%) | (various) | (3+) | |
| $^{188m1}$Bi | | 66(30) keV | 66(30) keV | 66(30) keV | >5 μs | | | 7+# | |
| $^{188m2}$Bi | | 153(30) keV | 153(30) keV | 153(30) keV | 265(15) ms | α | $^{184}$Tl | (10−) | |
| $^{188m2}$Bi | | 153(30) keV | 153(30) keV | 153(30) keV | 265(15) ms | β$^+$, SF (0.0046%) | (various) | (10−) | |
| $^{189}$Bi | | 83 | 106 | 188.989195(22) | 688(5) ms | α | $^{185}$Tl | 9/2− | |
| $^{189m1}$Bi | | 184(5) keV | 184(5) keV | 184(5) keV | 5.0(1) ms | α (83%) | $^{185}$Tl | 1/2+ | |
| $^{189m1}$Bi | | 184(5) keV | 184(5) keV | 184(5) keV | 5.0(1) ms | IT (17%) | $^{189}$Bi | 1/2+ | |
| $^{189m2}$Bi | | 357.6(5) keV | 357.6(5) keV | 357.6(5) keV | 880(50) ns | IT | $^{189}$Bi | 13/2+ | |
| $^{190}$Bi | | 83 | 107 | 189.988625(23) | 6.3(1) s | α (77%) | $^{186}$Tl | (3+) | |
| $^{190}$Bi | | 83 | 107 | 189.988625(23) | 6.3(1) s | β$^+$ (23%) | $^{190}$Pb | (3+) | |
| $^{190}$Bi | | 83 | 107 | 189.988625(23) | 6.3(1) s | β$^+$, SF (6×10$^{−6}$%) | (various) | (3+) | |
| $^{190m1}$Bi | | 120(40) keV | 120(40) keV | 120(40) keV | 6.2(1) s | α (70%) | $^{186}$Tl | 10− | |
| $^{190m1}$Bi | | 120(40) keV | 120(40) keV | 120(40) keV | 6.2(1) s | β$^+$ (30%) | $^{190}$Pb | 10− | |
| $^{190m1}$Bi | | 120(40) keV | 120(40) keV | 120(40) keV | 6.2(1) s | β$^+$, SF (4×10$^{−6}$%) | (various) | 10− | |
| $^{190m2}$Bi | | 121(15) keV | 121(15) keV | 121(15) keV | 175(8) ns | IT | $^{190}$Bi | (5−) | |
| $^{190m3}$Bi | | 394(40) keV | 394(40) keV | 394(40) keV | 1.3(8) μs | IT | $^{190}$Bi | (8−) | |
| $^{191}$Bi | | 83 | 108 | 190.985787(8) | 12.4(3) s | α (51%) | $^{187}$Tl | 9/2− | |
| $^{191}$Bi | | 83 | 108 | 190.985787(8) | 12.4(3) s | β$^+$ (49%) | $^{191}$Pb | 9/2− | |
| $^{191m1}$Bi | | 242(4) keV | 242(4) keV | 242(4) keV | 125(8) ms | α (68%) | $^{187}$Tl | 1/2+ | |
| $^{191m1}$Bi | | 242(4) keV | 242(4) keV | 242(4) keV | 125(8) ms | IT (?%) | $^{191}$Bi | 1/2+ | |
| $^{191m1}$Bi | | 242(4) keV | 242(4) keV | 242(4) keV | 125(8) ms | β$^+$ (?%) | $^{191}$Pb | 1/2+ | |
| $^{191m2}$Bi | | 429.7(5) keV | 429.7(5) keV | 429.7(5) keV | 562(10) ns | IT | $^{191}$Bi | 13/2+ | |
| $^{191m3}$Bi | | 1875(25)# keV | 1875(25)# keV | 1875(25)# keV | 400(40) ns | IT | $^{191}$Bi | 25/2-# | |
| $^{192}$Bi | | 83 | 109 | 191.98547(3) | 34.6(9) s | β$^+$ (88%) | $^{192}$Pb | (3+) | |
| $^{192}$Bi | | 83 | 109 | 191.98547(3) | 34.6(9) s | α (12%) | $^{188}$Tl | (3+) | |
| $^{192m}$Bi | | 140(30) keV | 140(30) keV | 140(30) keV | 39.6(4) s | β$^+$ (90%) | $^{192}$Pb | 10− | |
| $^{192m}$Bi | | 140(30) keV | 140(30) keV | 140(30) keV | 39.6(4) s | α (10%) | $^{188}$Tl | 10− | |
| $^{193}$Bi | | 83 | 110 | 192.982947(8) | 63.6(30) s | β$^+$ (96.5%) | $^{193}$Pb | 9/2− | |
| $^{193}$Bi | | 83 | 110 | 192.982947(8) | 63.6(30) s | α (3.5%) | $^{189}$Tl | 9/2− | |
| $^{193m1}$Bi | | 305(6) keV | 305(6) keV | 305(6) keV | 3.20(14) s | α (84%) | $^{189}$Tl | 1/2+ | |
| $^{193m1}$Bi | | 305(6) keV | 305(6) keV | 305(6) keV | 3.20(14) s | β$^+$ (16%) | $^{193}$Pb | 1/2+ | |
| $^{193m2}$Bi | | 605.53(18) keV | 605.53(18) keV | 605.53(18) keV | 153(10) ns | IT | $^{193}$Bi | 13/2+ | |
| $^{193m3}$Bi | | 2349.6(6) keV | 2349.6(6) keV | 2349.6(6) keV | 85(3) μs | IT | $^{193}$Bi | 29/2+ | |
| $^{193m4}$Bi | | 2405.1(7) keV | 2405.1(7) keV | 2405.1(7) keV | 3.02(8) μs | IT | $^{193}$Bi | (29/2−) | |
| $^{194}$Bi | | 83 | 111 | 193.982799(6) | 95(3) s | β$^+$ (99.54%) | $^{194}$Pb | 3+ | |
| $^{194}$Bi | | 83 | 111 | 193.982799(6) | 95(3) s | α (0.46%) | $^{190}$Tl | 3+ | |
| $^{194m1}$Bi | | 150(50) keV | 150(50) keV | 150(50) keV | 125(2) s | β$^+$ | $^{194}$Pb | (6+, 7+) | |
| $^{194m2}$Bi | | 163(4) keV | 163(4) keV | 163(4) keV | 115(4) s | β$^+$ (99.80%) | $^{194}$Pb | (10−) | |
| $^{194m2}$Bi | | 163(4) keV | 163(4) keV | 163(4) keV | 115(4) s | α (0.20%) | $^{190}$Tl | (10−) | |
| $^{195}$Bi | | 83 | 112 | 194.980649(6) | 183(4) s | β$^+$ (99.97%) | $^{195}$Pb | 9/2− | |
| $^{195}$Bi | | 83 | 112 | 194.980649(6) | 183(4) s | α (0.030%) | $^{191}$Tl | 9/2− | |
| $^{195m1}$Bi | | 399(6) keV | 399(6) keV | 399(6) keV | 87(1) s | β$^+$ (67%) | $^{195}$Pb | 1/2+ | |
| $^{195m1}$Bi | | 399(6) keV | 399(6) keV | 399(6) keV | 87(1) s | α (33%) | $^{191}$Tl | 1/2+ | |
| $^{195m2}$Bi | | 2381.0(5) keV | 2381.0(5) keV | 2381.0(5) keV | 614(5) ns | IT | $^{195}$Bi | (29/2−) | |
| $^{195m3}$Bi | | 2615.9(5) keV | 2615.9(5) keV | 2615.9(5) keV | 1.49(1) μs | IT | $^{195}$Bi | 29/2+ | |
| $^{196}$Bi | | 83 | 113 | 195.980667(26) | 5.13(20) min | β$^+$ | $^{196}$Pb | (3+) | |
| $^{196}$Bi | | 83 | 113 | 195.980667(26) | 5.13(20) min | α (0.00115%) | $^{192}$Tl | (3+) | |
| $^{196m1}$Bi | | 166.4(29) keV | 166.4(29) keV | 166.4(29) keV | 0.6(5) s | IT | $^{196}$Bi | (7+) | |
| $^{196m2}$Bi | | 272(3) keV | 272(3) keV | 272(3) keV | 4.00(5) min | β$^+$ (74.2%) | $^{196}$Pb | (10−) | |
| $^{196m2}$Bi | | 272(3) keV | 272(3) keV | 272(3) keV | 4.00(5) min | IT (25.8%) | $^{196}$Bi | (10−) | |
| $^{196m2}$Bi | | 272(3) keV | 272(3) keV | 272(3) keV | 4.00(5) min | α (3.8×10$^{−4}$%) | $^{196}$Bi | (10−) | |
| $^{197}$Bi | | 83 | 114 | 196.978865(9) | 9.33(50) min | β$^+$ | $^{197}$Pb | 9/2− | |
| $^{197m1}$Bi | | 533(12) keV | 533(12) keV | 533(12) keV | 5.04(16) min | α (55%) | $^{193}$Tl | 1/2+ | |
| $^{197m1}$Bi | | 533(12) keV | 533(12) keV | 533(12) keV | 5.04(16) min | β$^+$ (45%) | $^{197}$Pb | 1/2+ | |
| $^{197m2}$Bi | | 2403(12) keV | 2403(12) keV | 2403(12) keV | 263(13) ns | IT | $^{197}$Bi | (29/2−) | |
| $^{197m3}$Bi | | 2929.5(5) keV | 2929.5(5) keV | 2929.5(5) keV | 209(30) ns | IT | $^{197}$Bi | (31/2−) | |
| $^{198}$Bi | | 83 | 115 | 197.979201(30) | 10.3(3) min | β$^+$ | $^{198}$Pb | 3+ | |
| $^{198m1}$Bi | | 290(40) keV | 290(40) keV | 290(40) keV | 11.6(3) min | β$^+$ | $^{198}$Pb | 7+ | |
| $^{198m2}$Bi | | 540(40) keV | 540(40) keV | 540(40) keV | 7.7(5) s | IT | $^{198}$Bi | 10− | |
| $^{199}$Bi | | 83 | 116 | 198.977673(11) | 27(1) min | β$^+$ | $^{199}$Pb | 9/2− | |
| $^{199m1}$Bi | | 667(3) keV | 667(3) keV | 667(3) keV | 24.70(15) min | β$^+$ (>98%) | $^{199}$Pb | (1/2+) | |
| $^{199m1}$Bi | | 667(3) keV | 667(3) keV | 667(3) keV | 24.70(15) min | IT (<2%) | $^{199}$Bi | (1/2+) | |
| $^{199m1}$Bi | | 667(3) keV | 667(3) keV | 667(3) keV | 24.70(15) min | α (0.01%) | $^{195}$Tl | (1/2+) | |
| $^{199m2}$Bi | | 1962(23) keV | 1962(23) keV | 1962(23) keV | 0.10(3) μs | IT | $^{199}$Bi | 25/2+# | |
| $^{199m3}$Bi | | 2548(23) keV | 2548(23) keV | 2548(23) keV | 168(13) ns | IT | $^{199}$Bi | 29/2−# | |
| $^{200}$Bi | | 83 | 117 | 199.978131(24) | 36.4(5) min | β$^+$ | $^{200}$Pb | 7+ | |
| $^{200m1}$Bi | | 100(70)# keV | 100(70)# keV | 100(70)# keV | 31(2) min | β$^+$ (?%) | $^{200}$Pb | (2+) | |
| $^{200m1}$Bi | | 100(70)# keV | 100(70)# keV | 100(70)# keV | 31(2) min | IT (?%) | $^{200}$Bi | (2+) | |
| $^{200m2}$Bi | | 428.20(10) keV | 428.20(10) keV | 428.20(10) keV | 400(50) ms | IT | $^{200}$Bi | (10−) | |
| $^{201}$Bi | | 83 | 118 | 200.976995(13) | 103(3) min | β$^+$ | $^{201}$Pb | 9/2− | |
| $^{201m1}$Bi | | 846.35(18) keV | 846.35(18) keV | 846.35(18) keV | 57.5(21) min | β$^+$ | $^{201}$Pb | 1/2+ | |
| $^{201m1}$Bi | | 846.35(18) keV | 846.35(18) keV | 846.35(18) keV | 57.5(21) min | α (?%) | $^{197}$Tl | 1/2+ | |
| $^{201m2}$Bi | | 1973(23) keV | 1973(23) keV | 1973(23) keV | 118(28) ns | IT | $^{201}$Bi | 25/2+# | |
| $^{201m3}$Bi | | 2012(23) keV | 2012(23) keV | 2012(23) keV | 105(75) ns | IT | $^{201}$Bi | 27/2+# | |
| $^{201m4}$Bi | | 2781(23) keV | 2781(23) keV | 2781(23) keV | 124(4) ns | IT | $^{201}$Bi | 29/2−# | |
| $^{202}$Bi | | 83 | 119 | 201.977723(15) | 1.72(5) h | β$^+$ | $^{202}$Pb | 5+ | |
| $^{202}$Bi | | 83 | 119 | 201.977723(15) | 1.72(5) h | α (<10$^{−5}$%) | $^{198}$Tl | 5+ | |
| $^{202m1}$Bi | | 625(12) keV | 625(12) keV | 625(12) keV | 3.04(6) μs | IT | $^{202}$Bi | 10−# | |
| $^{202m2}$Bi | | 2617(12) keV | 2617(12) keV | 2617(12) keV | 310(50) ns | IT | $^{202}$Bi | (17+) | |
| $^{203}$Bi | | 83 | 120 | 202.976892(14) | 11.76(5) h | β$^+$ | $^{203}$Pb | 9/2− | |
| $^{203m1}$Bi | | 1098.21(9) keV | 1098.21(9) keV | 1098.21(9) keV | 305(5) ms | IT | $^{203}$Bi | 1/2+ | |
| $^{203m2}$Bi | | 2041.5(6) keV | 2041.5(6) keV | 2041.5(6) keV | 194(30) ns | IT | $^{203}$Bi | 25/2+ | |
| $^{204}$Bi | | 83 | 121 | 203.977836(10) | 11.22(10) h | β$^+$ | $^{204}$Pb | 6+ | |
| $^{204m1}$Bi | | 805.5(3) keV | 805.5(3) keV | 805.5(3) keV | 13.0(1) ms | IT | $^{204}$Bi | 10− | |
| $^{204m2}$Bi | | 2833.4(11) keV | 2833.4(11) keV | 2833.4(11) keV | 1.07(3) ms | IT | $^{204}$Bi | 17+ | |
| $^{205}$Bi | | 83 | 122 | 204.977385(5) | 14.91(7) d | β$^+$ | $^{205}$Pb | 9/2− | |
| $^{205m1}$Bi | | 1497.17(9) keV | 1497.17(9) keV | 1497.17(9) keV | 7.9(7) μs | IT | $^{205}$Bi | 1/2+ | |
| $^{205m2}$Bi | | 2064.7(4) keV | 2064.7(4) keV | 2064.7(4) keV | 100(6) ns | IT | $^{205}$Bi | 21/2+ | |
| $^{205m3}$Bi | | 2139.0(7) keV | 2139.0(7) keV | 2139.0(7) keV | 220(25) ns | IT | $^{205}$Bi | 25/2+ | |
| $^{206}$Bi | | 83 | 123 | 205.978499(8) | 6.243(3) d | β$^+$ | $^{206}$Pb | 6+ | |
| $^{206m1}$Bi | | 59.897(17) keV | 59.897(17) keV | 59.897(17) keV | 7.7(2) μs | IT | $^{206}$Bi | 4+ | |
| $^{206m2}$Bi | | 1044.8(7) keV | 1044.8(7) keV | 1044.8(7) keV | 890(10) μs | IT | $^{206}$Bi | 10− | |
| $^{206m3}$Bi | | 9233.3(8) keV | 9233.3(8) keV | 9233.3(8) keV | 155(15) ns | IT | $^{206}$Bi | (28−) | |
| $^{206m4}$Bi | | 10170.5(8) keV | 10170.5(8) keV | 10170.5(8) keV | >2 μs | IT | $^{206}$Bi | (31+) | |
| $^{207}$Bi | | 83 | 124 | 206.9784706(26) | 31.22(17) y | β$^+$ | $^{207}$Pb | 9/2− | |
| $^{207m}$Bi | | 2101.61(16) keV | 2101.61(16) keV | 2101.61(16) keV | 182(6) μs | IT | $^{207}$Bi | 21/2+ | |
| $^{208}$Bi | | 83 | 125 | 207.9797421(25) | 3.68(4)×10$^5$ y | β$^+$ | $^{208}$Pb | 5+ | |
| $^{208m}$Bi | | 1571.1(4) keV | 1571.1(4) keV | 1571.1(4) keV | 2.58(4) ms | IT | $^{208}$Bi | 10− | |
| $^{209}$Bi | | 83 | 126 | 208.9803986(15) | 2.01(8)×10$^{19}$ y | α | $^{205}$Tl | 9/2− | 1.0000 |
| $^{210}$Bi | Radium E | 83 | 127 | 209.9841202(15) | 5.012(5) d | β$^−$ | $^{210}$Po | 1− | Trace |
| $^{210}$Bi | Radium E | 83 | 127 | 209.9841202(15) | 5.012(5) d | α (1.32×10$^{−4}$%) | $^{206}$Tl | 1− | Trace |
| $^{210m}$Bi | | 271.31(11) keV | 271.31(11) keV | 271.31(11) keV | 3.04(6)×10$^6$ y | α | $^{206}$Tl | 9− | |
| $^{211}$Bi | Actinium C | 83 | 128 | 210.987269(6) | 2.14(2) min | α (99.72%) | $^{207}$Tl | 9/2− | Trace |
| $^{211}$Bi | Actinium C | 83 | 128 | 210.987269(6) | 2.14(2) min | β$^−$ (0.276%) | $^{211}$Po | 9/2− | Trace |
| $^{211m}$Bi | | 1257(10) keV | 1257(10) keV | 1257(10) keV | 1.4(3) μs | IT | $^{211}$Bi | (25/2−) | |
| $^{212}$Bi | Thorium C | 83 | 129 | 211.991285(2) | 60.55(6) min | β$^−$ (64.05%) | $^{212}$Po | 1− | Trace |
| $^{212}$Bi | Thorium C | 83 | 129 | 211.991285(2) | 60.55(6) min | α (35.94%) | $^{208}$Tl | 1− | Trace |
| $^{212}$Bi | Thorium C | 83 | 129 | 211.991285(2) | 60.55(6) min | β$^−$, α (0.014%) | $^{208}$Pb | 1− | Trace |
| $^{212m1}$Bi | | 250(30) keV | 250(30) keV | 250(30) keV | 25.0(2) min | α (67%) | $^{208}$Tl | (8−, 9−) | |
| $^{212m1}$Bi | | 250(30) keV | 250(30) keV | 250(30) keV | 25.0(2) min | β$^−$, α (30%) | $^{208}$Pb | (8−, 9−) | |
| $^{212m1}$Bi | | 250(30) keV | 250(30) keV | 250(30) keV | 25.0(2) min | β$^−$ (3%) | $^{212}$Po | (8−, 9−) | |
| $^{212m2}$Bi | | 1479(30) keV | 1479(30) keV | 1479(30) keV | 7.0(3) min | β$^−$ | $^{212}$Po | (18−) | |
| $^{213}$Bi | | 83 | 130 | 212.994384(5) | 45.60(4) min | β$^−$ (97.91%) | $^{213}$Po | 9/2− | Trace |
| $^{213}$Bi | | 83 | 130 | 212.994384(5) | 45.60(4) min | α (2.09%) | $^{209}$Tl | 9/2− | Trace |
| $^{213m}$Bi | | 1353(21) keV | 1353(21) keV | 1353(21) keV | >168 s | | | 25/2−# | |
| $^{214}$Bi | Radium C | 83 | 131 | 213.998711(12) | 19.9(4) min | β$^−$ (99.98%) | $^{214}$Po | 1− | Trace |
| $^{214}$Bi | Radium C | 83 | 131 | 213.998711(12) | 19.9(4) min | α (0.021%) | $^{210}$Tl | 1− | Trace |
| $^{214}$Bi | Radium C | 83 | 131 | 213.998711(12) | 19.9(4) min | β$^−$, α (0.003%) | $^{210}$Pb | 1− | Trace |
| $^{214m}$Bi | | 539(30) keV | 539(30) keV | 539(30) keV | >93 s | | | 8−# | |
| $^{215}$Bi | | 83 | 132 | 215.001749(6) | 7.62(13) min | β$^−$ | $^{215}$Po | (9/2−) | Trace |
| $^{215m}$Bi | | 1367(20)# keV | 1367(20)# keV | 1367(20)# keV | 36.9(6) s | IT (76.9%) | $^{215}$Bi | (25/2−) | |
| $^{215m}$Bi | | 1367(20)# keV | 1367(20)# keV | 1367(20)# keV | 36.9(6) s | β$^−$ (23.1%) | $^{215}$Po | (25/2−) | |
| $^{216}$Bi | | 83 | 133 | 216.006306(12) | 2.21(4) min | β$^−$ | $^{216}$Po | (6−, 7−) | |
| $^{216m}$Bi | | 24(19) keV | 24(19) keV | 24(19) keV | 6.6(21) min | β$^−$ | $^{216}$Po | 3−# | |
| $^{217}$Bi | | 83 | 134 | 217.009372(19) | 98.5(13) s | β$^−$ | $^{217}$Po | 9/2−# | |
| $^{217m}$Bi | | 1491(20) keV | 1491(20) keV | 1491(20) keV | 3.0(2) μs | IT | $^{217}$Bi | 25/2−# | |
| $^{218}$Bi | | 83 | 135 | 218.014188(29) | 33(1) s | β$^−$ | $^{218}$Po | 8−# | |
| $^{219}$Bi | | 83 | 136 | 219.01752(22)# | 8.7(29) s | β$^−$ | $^{219}$Po | 9/2−# | |
| $^{220}$Bi | | 83 | 137 | 220.02250(32)# | 9.5(57) s | β$^−$ | $^{220}$Po | 1−# | |
| $^{221}$Bi | | 83 | 138 | 221.02598(32)# | 2# s [>300 ns] | | | 9/2−# | |
| $^{222}$Bi | | 83 | 139 | 222.03108(32)# | 3# s [>300 ns] | | | 1−# | |
| $^{223}$Bi | | 83 | 140 | 223.03461(43)# | 1# s [>300 ns] | | | 9/2−# | |
| $^{224}$Bi | | 83 | 141 | 224.03980(43)# | 1# s [>300 ns] | | | 1−# | |
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* ↑ $^m$Bi – Excited nuclear isomer.
* ↑ ( ) – Uncertainty (1σ) is given in concise form in parentheses after the corresponding last digits.
* ↑ # – Atomic mass marked #: value and uncertainty derived not from purely experimental data, but at least partly from trends from the Mass Surface (TMS).
* ↑ Bold half-life – nearly stable, half-life longer than age of universe.
* ↑ Modes of decay: EC:Electron capture IT:Isomeric transition p:Proton emission
* ↑ Bold symbol as daughter – Daughter product is stable.
* ↑ ( ) spin value – Indicates spin with weak assignment arguments.
* 1 2 # – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN).
* 1 2 3 4 Order of ground state and isomer is uncertain.
* ↑ Formerly believed to be final decay product of 4n+1 decay chain
* ↑ Primordial radioisotope, also some is radiogenic from the extinct nuclide $^{237}$Np
* ↑ Formerly believed to be the heaviest stable nuclide
* 1 2 Intermediate decay product of $^{238}$U
* 1 2 Intermediate decay product of $^{235}$U
* ↑ Intermediate decay product of $^{232}$Th
* ↑ Used in medicine such as for cancer treatment.
* ↑ A byproduct of thorium reactors via $^{233}$U.
* ↑ Intermediate decay product of $^{237}$Np

## Bismuth-213

Bismuth-213 ($^{213}$Bi) has a half-life of 45 minutes and decays via alpha emission. Commercially, bismuth-213 can be produced by bombarding radium with bremsstrahlung photons from a linear particle accelerator, which populates its progenitor actinium-225. In 1997, an antibody conjugate with $^{213}$Bi was used to treat patients with leukemia. This isotope has also been tried in targeted alpha therapy (TAT) program to treat a variety of cancers. Bismuth-213 is also found in the decay chain of uranium-233, which is the fuel bred by thorium reactors.