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Isotopes of the Element Thorium

[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
232100%1.40×1010 years

Known Isotopes

Mass NumberHalf-lifeDecay ModeBranching Percentage
2081.7 millisecondsAlpha Decay100.00%
2092.5 millisecondsAlpha DecayNo Data Available
21016 millisecondsElectron Capture~ 1.00%
Alpha Decay99.00%
2110.04 secondsAlpha DecayNo Data Available
21231.7 millisecondsAlpha Decay100.00%
Electron Capture~ 0.30%
213144 millisecondsAlpha Decay<= 100.00%
21487 millisecondsAlpha Decay100.00%
2151.2 secondsAlpha Decay100.00%
21626.0 millisecondsAlpha Decay100.00%
Electron Capture~ 0.01%
216m134 microsecondsAlpha Decay2.80%
Isomeric TransitionNo Data Available
2170.241 millisecondsAlpha Decay100.00%
218117 nanosecondsAlpha Decay100.00%
2191.05 microsecondsAlpha Decay100.00%
2209.7 microsecondsAlpha Decay100.00%
Electron Capture2.0×10-7 %
2211.68 millisecondsAlpha Decay100.00%
2222.8 millisecondsAlpha Decay100.00%
2230.60 secondsAlpha Decay100.00%
2240.81 secondsAlpha Decay100.00%
2258.75 minutesElectron Capture~ 10.00%
Alpha Decay~ 90.00%
22630.57 minutesAlpha Decay100.00%
22718.68 daysAlpha Decay100.00%
2281.9116 yearsAlpha Decay100.00%
Emission of an oxygen-20 nucleus   1×10-11 %
2297932 yearsAlpha Decay100.00%
229m2 minutesIsomeric Transition (suspected)No Data Available
2307.54×10+4 yearsAlpha Decay100.00%
Emission of a neon-24 nucleus6×10-11 %
Spontaneous Fission<= 4×10-12 %
23125.52 hoursAlpha Decay~ 4×10-11 %
Beta-minus Decay100.00%
2321.40×1010 yearsAlpha Decay100.00%
Spontaneous Fission1.1×10-9 %
23321.83 minutesBeta-minus Decay100.00%
23424.10 daysBeta-minus Decay100.00%
2357.2 minutesBeta-minus Decay100.00%
23637.3 minutesBeta-minus Decay100.00%
2374.7 minutesBeta-minus Decay100.00%
2389.4 minutesBeta-minus Decay100.00%
239No Data Available   No Data AvailableNo Data Available