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Thallium

Isotopes of the Element Mercury

[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
1960.15%STABLE
1989.97%STABLE
19916.87%STABLE
20023.10%STABLE
20113.18%STABLE
20229.86%STABLE
2046.87%STABLE

Known Isotopes

Mass NumberHalf-lifeDecay ModeBranching Percentage
17159 microsecondsAlpha Decay100.00%
172231 microsecondsAlpha Decay100.00%
1730.6 millisecondsAlpha Decay100.00%
1742.1 millisecondsAlpha Decay99.60%
17510.6 millisecondsAlpha Decay100.00%
17620.3 millisecondsAlpha Decay94.00%
177118 millisecondsAlpha Decay100.00%
178266.5 millisecondsAlpha Decay~ 70.00%
Electron Capture~ 30.00%
1791.05 secondsElectron Capture45.00%
Electron Capture with
delayed Proton Emission
~ 0.15%
Alpha Decay55.00%
1802.58 secondsElectron Capture52.00%
Alpha Decay48.00%
1813.6 secondsElectron Capture73.00%
Alpha Decay27.00%
Electron Capture with
delayed Proton Emission
0.01%
Electron Capture with
delayed Alpha Decay
9.0×10-6 %
18210.83 secondsElectron Capture84.80%
Alpha Decay15.20%
1839.4 secondsAlpha Decay11.70%
Electron Capture with
delayed Proton Emission
2.6×10-4 %
Electron Capture88.30%
18430.87 secondsElectron Capture98.89%
Alpha Decay1.11%
18549.1 secondsElectron Capture94.00%
Alpha Decay6.00%
185m21.6 secondsIsomeric Transition54.00%
Electron Capture46.00%
Alpha Decay~ 0.03%
1861.38 minutesAlpha Decay0.02%
Electron Capture99.98%
1872.4 minutesElectron Capture100.00%
Alpha Decay< 3.7×10-4 %
187m1.9 minutesElectron Capture100.00%
Alpha Decay< 3.7×10-4 %
1883.25 minutesElectron Capture100.00%
Alpha Decay3.7×10-5 %
1897.6 minutesElectron Capture100.00%
Alpha Decay< 3.0×10-5 %
189m8.6 minutesElectron Capture100.00%
Alpha Decay< 3.0×10-5 %
19020.0 minutesElectron Capture100.00%
Alpha Decay< 3.4×10-7 %
19149 minutesElectron Capture100.00%
Alpha Decay5.0×10-6 %
191m50.8 minutesElectron Capture100.00%
1924.85 hoursElectron Capture100.00%
1933.80 hoursElectron Capture100.00%
193m11.8 hoursElectron Capture92.80%
Isomeric Transition7.20%
194444 yearsElectron Capture100.00%
19510.53 hoursElectron Capture100.00%
195m41.6 hoursIsomeric Transition54.20%
Electron Capture45.80%
196STABLE--
19764.14 hoursElectron Capture100.00%
197m23.8 hoursIsomeric Transition91.40%
Electron Capture8.60%
198STABLE--
199STABLE--
199m42.67 minutesIsomeric Transition100.00%
200STABLE--
201STABLE--
202STABLE--
20346.594 daysBeta-minus Decay100.00%
204STABLE--
2055.14 minutesBeta-minus Decay100.00%
205m1.09 millisecondsIsomeric Transition100.00%
2068.32 minutesBeta-minus Decay100.00%
2072.9 minutesBeta-minus Decay100.00%
20841 minutesBeta-minus Decay100.00%
20935 secondsBeta-minus Decay100.00%
210> 300 nanosecondsBeta-minus Decay (suspected)No Data Available
211> 300 nanosecondsBeta-minus DecayNo Data Available
Beta-minus Decay with
delayed Neutron Emission
No Data Available
212> 300 nanosecondsBeta-minus DecayNo Data Available
Beta-minus Decay with
delayed Neutron Emission
No Data Available
213> 300 nanosecondsBeta-minus DecayNo Data Available
Beta-minus Decay with
delayed Neutron Emission
No 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 Decay with
delayed Neutron Emission
No Data Available
Beta-minus DecayNo Data Available