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Isotopes of the Element Bismuth

[Click for Main Data]

Most of the isotope data on this site has been obtained from the National Nuclear Data Center. Please visit their site for more information.

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 nanosecondsBeta-minus DecayNo Data Available
Beta-minus Decay with
delayed Neutron Emission
No Data Available