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Isotopes of the Element Thallium

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