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Isotopes of the Element Bismuth

[Click for Main Data]         Proton Emission     Neutron Emission     Electron Emission     Positron Emission

Most of the isotope data on this site has been obtained from the National Nuclear Data Center.

Naturally Occurring Isotopes

Mass NumberNatural AbundanceHalf-life
209100%1.9×10+19 years

Known Isotopes

Mass NumberHalf-lifeDecay ModeBranching Percentage
18413 millisecondsAlpha Decay100.00%
Alpha Decay100.00%
18558 microsecondsProton Emission90.00%
Alpha Decay10.00%
18615.0 millisecondsAlpha Decay100.00%
186m9.8 millisecondsAlpha Decay100.00%
18737 millisecondsAlpha Decay100.00%
187m0.370 millisecondsAlpha Decay100.00%
188265 millisecondsAlpha Decay100.00%
Electron Capture (suspected)   No Data Available
188m60 millisecondsAlpha Decay100.00%
Electron Capture (suspected)No Data Available
189674 millisecondsAlpha Decay> 50.00%
Electron Capture< 50.00%
189m5.0 millisecondsAlpha Decay> 50.00%
Electron Capture< 50.00%
1906.3 secondsAlpha Decay90.00%
Electron Capture10.00%
190m6.2 secondsAlpha Decay70.00%
Electron Capture30.00%
19112.4 secondsAlpha Decay51.00%
Electron Capture49.00%
191m125 millisecondsAlpha Decay68.00%
Isomeric Transition32.00%
Electron CaptureNo Data Available
19234.6 secondsElectron Capture88.00%
Alpha Decay12.00%
192m39.6 secondsElectron Capture90.00%
Alpha Decay10.00%
19363.6 secondsElectron Capture96.50%
Alpha Decay3.50%
193m3.2 secondsAlpha Decay84.00%
Electron Capture16.00%
19495 secondsElectron Capture99.54%
Alpha Decay0.46%
194m125 secondsElectron Capture100.00%
194m1115 secondsElectron Capture99.80%
Alpha Decay0.20%
195183 secondsElectron Capture99.97%
Alpha Decay0.03%
195m87 secondsElectron Capture67.00%
Alpha Decay33.00%
196308 secondsElectron Capture100.00%
Alpha Decay1.2×10-3 %
196m0.6 secondsElectron CaptureNo Data Available
Isomeric TransitionNo Data Available
196m1240 secondsElectron Capture74.20%
Isomeric Transition25.80%
Alpha Decay3.8×10-4 %
1979.33 minutesElectron Capture100.00%
Alpha Decay1.0×10-4 %
197m5.04 minutesAlpha Decay55.00%
Electron Capture45.00%
Isomeric Transition< 0.30%
19810.3 minutesElectron Capture100.00%
198m11.6 minutesElectron Capture100.00%
198m17.7 secondsIsomeric Transition100.00%
19927 minutesElectron Capture100.00%
199m24.70 minutesElectron Capture99.00%
Isomeric Transition<= 2.00%
Alpha Decay~ 0.01%
20036.4 minutesElectron Capture100.00%
200m31 minutesElectron Capture<= 100.00%
200m10.40 secondsIsomeric Transition100.00%
201103 minutesElectron Capture100.00%
201m57.5 minutesElectron Capture> 91.10%
Isomeric Transition<= 8.60%
Alpha Decay~ 0.30%
2021.71 hoursElectron Capture100.00%
20311.76 hoursElectron Capture100.00%
203m305 millisecondsIsomeric Transition100.00%
20411.22 hoursElectron Capture100.00%
204m13.0 millisecondsIsomeric Transition100.00%
204m11.07 millisecondsIsomeric Transition100.00%
20515.31 daysElectron Capture100.00%
2066.243 daysElectron Capture100.00%
206m0.89 millisecondsIsomeric Transition100.00%
20731.55 yearsElectron Capture100.00%
2083.68×10+5 yearsElectron Capture100.00%
208m2.58 millisecondsIsomeric Transition100.00%
2091.9×10+19 yearsAlpha Decay100.00%
2105.012 daysBeta-minus Decay100.00%
Alpha Decay1.3×10-4 %
210m3.04×10+6 yearsAlpha Decay100.00%
2112.14 minutesAlpha Decay99.72%
Beta-minus Decay0.28%
21260.55 minutesBeta-minus Decay64.06%
Alpha Decay35.94%
212m25.0 minutesAlpha Decay67.00%
Beta-minus Decay33.00%
Beta-minus Decay with
delayed Alpha Decay
30.00%
212m17.0 minutesBeta-minus Decay100.00%
21345.59 minutesBeta-minus Decay97.80%
Alpha Decay2.20%
21419.9 minutesBeta-minus Decay99.98%
Alpha Decay0.02%
2157.6 minutesBeta-minus Decay100.00%
215m36.9 secondsIsomeric Transition76.2%
Beta-minus Decay23.8%
2162.25 minutesBeta-minus Decay<= 100.00%
216m6.6 minutesBeta-minus Decay<= 100.00%
21798.5 secondsBeta-minus Decay100.00%
21833 secondsBeta-minus Decay100.00%
219> 300 nanosecondsBeta-minus DecayNo Data Available
220> 300 nanosecondsBeta-minus DecayNo Data Available
221> 300 nanosecondsBeta-minus DecayNo Data Available
Beta-minus Decay with
delayed Neutron Emission
No Data Available
222> 300 nanosecondsBeta-minus DecayNo Data Available
223> 300 nanosecondsBeta-minus DecayNo Data Available
Beta-minus Decay with
delayed Neutron Emission
No Data Available
224> 300 nanoseconds   Beta-minus DecayNo Data Available
Beta-minus Decay with
delayed Neutron Emission
No Data Available