Isotopes of bismuth

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]


Standard atomic mass: 208.98040(1) u

Isotopes of bismuth (Bi) occurring within the radioactive disintegration chains of actinium, radium and thorium were known as:

  • radium E : 210Bi
  • actinium C : 211Bi
  • thorium C : 212Bi
  • radium C : 214Bi

Table

nuclide
symbol
Z(p) N(n)  
isotopic mass (u)
 
half-life nuclear
spin
representative
isotopic
composition
(mole fraction)
range of natural
variation
(mole fraction)
excitation energy
184Bi 83 101 184.00112(14)# 6.6(15) ms 3+#
184mBi 150(100)# keV 13(2) ms 10-#
185Bi 83 102 184.99763(6)# 2# ms 9/2-#
185mBi 70(50)# keV 49(7) µs 1/2+
186Bi 83 103 185.99660(8) 14.8(7) ms (3+)
186mBi 270(140)# keV 9.8(4) ms (10-)
187Bi 83 104 186.993158(16) 32(3) ms 9/2-#
187m1Bi 101(20) keV 320(70) µs 1/2+#
187m2Bi 252(1) keV 7(5) µs (13/2+)
188Bi 83 105 187.99227(5) 44(3) ms 3+#
188mBi 210(140)# keV 220(40) ms (10-)
189Bi 83 106 188.98920(6) 674(11) ms (9/2-)
189m1Bi 181(6) keV 5.0(1) ms (1/2+)
189m2Bi 357(1) keV 880(50) ns (13/2+)
190Bi 83 107 189.9883(2) 6.3(1) s (3+)
190m1Bi 420(180) keV 6.2(1) s (10-)
190m2Bi 690(180) keV >500(100) ns 7+#
191Bi 83 108 190.985786(8) 12.3(3) s (9/2-)
191mBi 240(4) keV 124(5) ms (1/2+)
192Bi 83 109 191.98546(4) 34.6(9) s (3+)
192mBi 150(30) keV 39.6(4) s (10-)
193Bi 83 110 192.98296(1) 67(3) s (9/2-)
193mBi 308(7) keV 3.2(6) s (1/2+)
194Bi 83 111 193.98283(5) 95(3) s (3+)
194m1Bi 110(70) keV 125(2) s (6+,7+)
194m2Bi 230(90)# keV 115(4) s (10-)
195Bi 83 112 194.980651(6) 183(4) s (9/2-)
195m1Bi 399(6) keV 87(1) s (1/2+)
195m2Bi 2311.4+X keV 750(50) ns (29/2-)
196Bi 83 113 195.980667(26) 5.1(2) min (3+)
196m1Bi 166.6(30) keV 0.6(5) s (7+)
196m2Bi 270(3) keV 4.00(5) min (10-)
197Bi 83 114 196.978864(9) 9.33(50) min (9/2-)
197m1Bi 690(110) keV 5.04(16) min (1/2+)
197m2Bi 2129.3(4) keV 204(18) ns (23/2-)
197m3Bi 2360.4(5)+X keV 263(13) ns (29/2-)
197m4Bi 2383.1(7)+X keV 253(39) ns (29/2-)
197m5Bi 2929.5(5) keV 209(30) ns (31/2-)
198Bi 83 115 197.97921(3) 10.3(3) min (2+,3+)
198m1Bi 280(40) keV 11.6(3) min (7+)
198m2Bi 530(40) keV 7.7(5) s 10-
199Bi 83 116 198.977672(13) 27(1) min 9/2-
199m1Bi 667(4) keV 24.70(15) min (1/2+)
199m2Bi 1947(25) keV 0.10(3) µs (25/2+)
199m3Bi ~2547.0 keV 168(13) ns 29/2-
200Bi 83 117 199.978132(26) 36.4(5) min 7+
200m1Bi 100(70)# keV 31(2) min (2+)
200m2Bi 428.20(10) keV 400(50) ms (10-)
201Bi 83 118 200.977009(16) 108(3) min 9/2-
201m1Bi 846.34(21) keV 59.1(6) min 1/2+
201m2Bi 1932.2+X keV 118(28) ns (25/2+)
201m3Bi 1971.2+X keV 105(75) ns (27/2+)
201m4Bi 2739.90(20)+X keV 124(4) ns (29/2-)
202Bi 83 119 201.977742(22) 1.72(5) h 5(+#)
202m1Bi 615(7) keV 3.04(6) µs (10#)-
202m2Bi 2607.1(5) keV 310(50) ns (17+)
203Bi 83 120 202.976876(23) 11.76(5) h 9/2-
203m1Bi 1098.14(7) keV 303(5) ms 1/2+
203m2Bi 2041.5(6) keV 194(30) ns 25/2+
204Bi 83 121 203.977813(28) 11.22(10) h 6+
204m1Bi 805.5(3) keV 13.0(1) ms 10-
204m2Bi 2833.4(11) keV 1.07(3) ms (17+)
205Bi 83 122 204.977389(8) 15.31(4) d 9/2-
206Bi 83 123 205.978499(8) 6.243(3) d 6(+)
206m1Bi 59.897(17) keV 7.7(2) µs (4+)
206m2Bi 1044.8(5) keV 890(10) µs (10-)
207Bi 83 124 206.9784707(26) 32.9(14) a 9/2-
207mBi 2101.49(16) keV 182(6) µs 21/2+
208Bi 83 125 207.9797422(25) 3.68(4)E+5 a (5)+
208mBi 1571.1(4) keV 2.58(4) ms (10)-
209Bi 83 126 208.9803987(16) 1.9(2)E+19 a 9/2- 1.0000
210Bi 83 127 209.9841204(16) 5.012(5) d 1-
210mBi 271.31(11) keV 3.04(6)E+6 a 9-
211Bi 83 128 210.987269(6) 2.14(2) min 9/2-
211mBi 1257(10) keV 1.4(3) µs (25/2-)
212Bi 83 129 211.9912857(21) 60.55(6) min 1(-)
212m1Bi 250(30) keV 25.0(2) min (9-)
212m2Bi 2200(200)# keV 7.0(3) min >15
213Bi 83 130 212.994385(5) 45.59(6) min 9/2-
214Bi 83 131 213.998712(12) 19.9(4) min 1-
215Bi 83 132 215.001770(16) 7.6(2) min (9/2-)
215mBi 1347.5(25) keV 36.4(25) min (25/2-)
216Bi 83 133 216.006306(12) 2.17(5) min 1-#
217Bi 83 134 217.00947(21)# 98.5(8) s 9/2-#
218Bi 83 135 218.01432(39)# 33(1) s 1-#

Notes

  • Values marked # are not purely derived from experimental data, but at least partly from systematic trends. Spins with weak assignment arguments are enclosed in parentheses.
  • Uncertainties are given in concise form in parentheses after the corresponding last digits. Uncertainty values denote one standard deviation, except isotopic composition and standard atomic mass from IUPAC which use expanded uncertainties.

References

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