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Lead

Isotopes of the Element Thallium

[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
20329.524%STABLE
20570.48%STABLE

Known Isotopes

Mass NumberHalf-lifeDecay ModeBranching Percentage
1765.2 millisecondsProton Emission100.00%
17718 millisecondsAlpha Decay73.00%
Proton Emission27.00%
178254 millisecondsAlpha Decay~ 53.00%
Electron Capture~ 47.00%
1790.23 secondsAlpha Decay< 100.00%
Electron CaptureNo Data Available
Proton EmissionNo Data Available
179m1.5 millisecondsElectron CaptureNo Data Available
Isomeric TransitionNo Data Available
Alpha Decay<= 100.00%
Proton EmissionNo Data Available
1801.09 secondsElectron Capture94.00%
Alpha Decay6.00%
Electron Capture with
delayed Spontaneous Fission
~ 1.0×10-4 %
1813.2 secondsElectron CaptureNo Data Available
Alpha Decay<= 10.00%
181m1.40 millisecondsIsomeric Transition99.60%
Alpha Decay0.40%
1823.1 secondsElectron Capture97.50%
Alpha Decay< 5.00%
1836.9 secondsAlpha DecayNo Data Available
Electron Capture> 0.00%
183m53.3 millisecondsIsomeric TransitionNo Data Available
Electron CaptureNo Data Available
Alpha Decay2.00%
18410.1 secondsElectron Capture97.90%
Alpha Decay2.10%
18519.5 secondsElectron CaptureNo Data Available
185m1.93 secondsAlpha DecayNo Data Available
Isomeric TransitionNo Data Available
18627.5 secondsAlpha Decay~ 6.0×10-3 %
Electron Capture100.00%
186m2.9 secondsIsomeric Transition100.00%
187≈ 51 secondsElectron Capture100.00%
Alpha Decay~ 0.03%
187m15.60 secondsElectron Capture< 99.90%
Isomeric Transition< 99.90%
Alpha Decay0.15%
18871 secondsElectron Capture100.00%
Electron Capture100.00%
188m41 millisecondsElectron CaptureNo Data Available
Isomeric Transition100.00%
1892.3 minutesElectron Capture100.00%
189m1.4 minutesElectron Capture< 100.00%
Isomeric Transition< 4.00%
1902.6 minutesElectron Capture100.00%
190m3.7 minutesElectron Capture100.00%
190m10.75 millisecondsIsomeric Transition100.00%
191No Data AvailableNo Data AvailableNo Data Available
191m5.22 minutesNo Data AvailableNo Data Available
1929.6 minutesElectron Capture100.00%
192m10.8 minutesElectron Capture100.00%
19321.6 minutesElectron Capture100.00%
193m2.11 minutesIsomeric Transition<= 75.00%
Electron Capture>= 25.00%
19433.0 minutesElectron Capture100.00%
Alpha Decay< 1.0×10-7 %
194m32.8 minutesElectron Capture100.00%
1951.16 hoursElectron Capture100.00%
195m3.6 secondsIsomeric Transition100.00%
1961.84 hoursElectron Capture100.00%
196m1.41 hoursElectron Capture96.20%
Isomeric Transition3.80%
1972.84 hoursElectron Capture100.00%
197m0.54 secondsIsomeric Transition100.00%
1985.3 hoursElectron Capture100.00%
198m1.87 hoursElectron Capture55.90%
Isomeric Transition44.10%
198m132.1 millisecondsIsomeric Transition100.00%
1997.42 hoursElectron Capture100.00%
199m28.4 millisecondsIsomeric Transition100.00%
20026.1 hoursElectron Capture100.00%
200m34.0 millisecondsIsomeric Transition100.00%
2013.0421 daysElectron Capture100.00%
201m2.01 millisecondsIsomeric Transition100.00%
20212.31 daysElectron Capture100.00%
203STABLE--
2043.783 yearsBeta-minus Decay97.08%
Electron Capture2.92%
205STABLE--
2064.202 minutesBeta-minus Decay100.00%
206m3.74 minutesIsomeric Transition100.00%
2074.77 minutesBeta-minus Decay100.00%
207m1.33 secondsIsomeric Transition100.00%
2083.053 minutesBeta-minus Decay100.00%
2092.161 minutesBeta-minus Decay100.00%
2101.30 minutesBeta-minus Decay100.00%
Beta-minus Decay with
delayed Neutron Emission
7.0×10-3 %
211> 300 nanosecondsBeta-minus Decay (suspected)No Data Available
212> 300 nanosecondsBeta-minus Decay (suspected)No Data Available
213101 secondsBeta-minus DecayNo Data Available
214> 300 nanosecondsBeta-minus DecayNo Data Available
Beta-minus Decay with
delayed Neutron Emission
No Data Available
215> 300 nanosecondsBeta-minus DecayNo Data Available
Beta-minus Decay with
delayed Neutron Emission
No Data Available
216> 300 nanosecondsBeta-minus DecayNo Data Available
Beta-minus Decay with
delayed Neutron Emission
No Data Available
217> 300 nanosecondsBeta-minus DecayNo Data Available
Beta-minus Decay with
delayed Neutron Emission
No Data Available