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Thallium

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The Periodic Table of Elements

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Bismuth

Isotopes of the Element Lead

[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
2041.4%>= 1.4×10+17 years
20624.1%STABLE
20722.1%STABLE
20852.4%STABLE

Known Isotopes

Mass NumberHalf-lifeDecay ModeBranching Percentage
1780.12 millisecondsAlpha Decay100.00%
1793.5 millisecondsAlpha Decay100.00%
1804.2 millisecondsAlpha Decay100.00%
18136 millisecondsAlpha Decay100.00%
181m45 millisecondsAlpha Decay< 100.00%
18255 millisecondsElectron Capture~ 2.00%
Alpha Decay~ 98.00%
183535 millisecondsAlpha Decay~ 90.00%
183m415 millisecondsAlpha Decay100.00%
184490 millisecondsAlpha Decay80.00%
Electron Capture20.00%
1856.3 secondsElectron CaptureNo Data Available
Alpha Decay34.00%
185m4.3 secondsAlpha Decay50.00%
Electron CaptureNo Data Available
1864.82 secondsElectron Capture60.00%
Alpha Decay40.00%
18718.3 secondsElectron Capture88.00%
Alpha Decay12.00%
187m15.2 secondsElectron Capture90.50%
Alpha Decay9.50%
18825.1 secondsElectron Capture90.70%
Alpha Decay9.30%
18939 secondsElectron Capture100.00%
Alpha Decay< 1.00%
189m50 secondsElectron Capture100.00%
Alpha Decay< 1.00%
19071 secondsAlpha Decay0.40%
Electron Capture99.60%
1911.33 minutesElectron Capture99.99%
Alpha Decay0.01%
191m2.18 minutesElectron Capture100.00%
Alpha Decay~ 0.02%
1923.5 minutesElectron Capture99.99%
Alpha Decay5.9×10-3 %
193No Data AvailableElectron CaptureNo Data Available
193m5.8 minutesElectron Capture100.00%
19410.7 minutesAlpha Decay7.3×10-6 %
Electron Capture100.00%
195≈ 15 minutesElectron Capture100.00%
195m15.0 minutesElectron Capture100.00%
19637 minutesElectron CaptureNo Data Available
Alpha Decay<= 3.0×10-5 %
1978.1 minutesElectron Capture100.00%
197m42.9 minutesElectron Capture81.00%
Isomeric Transition19.00%
1982.4 hoursElectron Capture100.00%
19990 minutesElectron Capture100.00%
199m12.2 minutesElectron Capture~ 7.00%
Isomeric Transition~ 93.00%
20021.5 hoursElectron Capture100.00%
2019.33 hoursElectron Capture100.00%
201m60.8 secondsIsomeric Transition100.00%
20252.5×10+3 yearsElectron Capture100.00%
202m3.54 hoursIsomeric Transition90.50%
Electron Capture9.50%
20351.92 hoursElectron Capture100.00%
203m6.21 secondsIsomeric Transition100.00%
203m1480 millisecondsIsomeric Transition100.00%
204>= 1.4×10+17 yearsAlpha DecayNo Data Available
204m66.93 minutesIsomeric Transition100.00%
2051.73×10+7 yearsElectron Capture100.00%
205m5.55 millisecondsIsomeric Transition100.00%
206STABLE--
207STABLE--
207m0.806 secondsIsomeric Transition100.00%
208STABLE--
2093.253 hoursBeta-minus Decay100.00%
21022.20 yearsBeta-minus Decay100.00%
Alpha Decay1.9×10-6 %
21136.1 minutesBeta-minus Decay100.00%
21210.64 hoursBeta-minus Decay100.00%
21310.2 minutesBeta-minus Decay100.00%
21426.8 minutesBeta-minus Decay100.00%
215147 secondsBeta-minus DecayNo Data Available
216> 300 nanosecondsBeta-minus DecayNo Data Available
217> 300 nanosecondsBeta-minus DecayNo Data Available
218> 300 nanosecondsBeta-minus DecayNo Data Available
219> 300 nanosecondsBeta-minus DecayNo Data Available
220> 300 nanosecondsBeta-minus DecayNo Data Available