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It's Elemental
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[Return to Bismuth's Data Page]

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

Isotopes of the Element Bismuth with a Known Natural Abundance

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

All Known Isotopes of the Element Bismuth

Mass NumberHalf-lifeDecay ModeBranching Percentage
18550 microsecondsProton Emission85.00
Alpha Decay15.00
18615.0 millisecondsAlpha Decay100.00
186m9.8 millisecondsAlpha Decay~ 100.00
18732 millisecondsAlpha Decay>= 50.00
187m0.29 millisecondsAlpha Decay>= 50.00
18844 millisecondsElectron Capture< 100.00
Alpha Decay> 0.00
188m0.21 secondsElectron Capture< 100.00
Alpha Decay> 0.00
189728 millisecondsAlpha Decay> 50.00
Electron Capture< 50.00
189m4.8 millisecondsAlpha Decay> 50.00
Electron Capture< 50.00
1906.2 secondsAlpha Decay70.00
Electron Capture30.00
190m6.3 secondsAlpha Decay~ 90.00
Electron Capture~ 10.00
19112.3 secondsAlpha Decay60.00
Electron Capture40.00
191m128 millisecondsAlpha Decay75.00
Electron Capture< 50.00
19234.6 secondsElectron Capture88.00
Alpha Decay12.00
192m39.6 secondsElectron Capture90.00
Alpha Decay10.00
19367 secondsElectron Capture96.50
Alpha Decay3.50
193m3.2 secondsAlpha Decay90.00
Electron Capture10.00
19495 secondsElectron Capture99.54
Alpha Decay0.46
194m115 secondsElectron Capture99.80
Alpha Decay0.20
194m2125 secondsElectron Capture100.00
195183 secondsElectron Capture99.97
Alpha Decay0.03
195m87 secondsElectron Capture67.00
Alpha Decay33.00
196308 secondsElectron Capture~ 100.00
Alpha Decay1.2E-3
196m0.6 secondsIsomeric TransitionNo Data Available
Electron CaptureNo Data Available
196m2240 secondsElectron Capture74.20
Isomeric Transition25.80
Alpha Decay3.8E-4
1979.33 minutesElectron Capture100.00
Alpha Decay1.0E-4
197m5.04 minutesAlpha Decay55.00
Electron Capture45.00
Isomeric Transition< 0.30
19810.3 minutesElectron Capture100.00
198m11.6 minutesElectron Capture100.00
198m27.7 secondsIsomeric Transition100.00
19927 minutesElectron Capture100.00
199m24.70 minutesElectron Capture>= 98.00
Isomeric Transition<= 2.00
Alpha Decay~ 0.01
20036.4 minutesElectron Capture100.00
200m31 minutesElectron Capture> 90.00
Isomeric Transition< 10.00
200m20.40 secondsIsomeric Transition100.00
201108 minutesElectron Capture100.00
Alpha Decay< 1.0E-4
201m59.1 minutesElectron Capture> 93.00
Isomeric Transition<= 6.80
Alpha Decay~ 0.30
2021.72 hoursElectron Capture100.00
Alpha Decay< 1.0E-5
20311.76 hoursElectron Capture100.00
Alpha Decay~ 1.0E-5
203m303 millisecondsIsomeric Transition100.00
20411.22 hoursElectron Capture100.00
20515.31 daysElectron Capture100.00
2066.243 daysElectron Capture100.00
20732.9 yearsElectron Capture100.00
207m182 microsecondsIsomeric Transition100.00
2083.68×10+5 yearsElectron Capture100.00
2091.9×10+19 yearsAlpha Decay100.00
2105.013 daysBeta-minus Decay100.00
Alpha Decay1.3E-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
Beta-minus Decay with
delayed Alpha Decay
0.014
212m25.0 minutesAlpha Decay67.00
Beta-minus Decay33.00
212m27.0 minutesBeta-minus Decay100.00
21345.59 minutesBeta-minus Decay97.91
Alpha Decay2.09
21419.9 minutesBeta-minus Decay99.98
Alpha Decay0.02
2157.6 minutesBeta-minus Decay100.00
215m36.4 secondsIsomeric TransitionNo Data Available
Beta-minus DecayNo Data Available
2162.17 minutesBeta-minus Decay<= 100.00
21797 secondsBeta-minus DecayNo Data Available

This page is maintained by Steve Gagnon.

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