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Isotopes of the Element Iodine

[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
127100%STABLE

Known Isotopes

Mass NumberHalf-lifeDecay ModeBranching Percentage
107No Data AvailableNo Data AvailableNo Data Available
10836 millisecondsAlpha Decay91.00%
Electron Capture9.00%
Proton Emission< 1.00%
10993.5 microsecondsProton Emission99.99%
Alpha Decay0.01%
1100.65 secondsElectron Capture83.00%
Alpha Decay17.00%
Electron Capture with
delayed Proton Emission
11.00%
Electron Capture with
delayed Alpha Decay
1.10%
1112.5 secondsElectron Capture99.90%
Alpha Decay~ 0.10%
1123.42 secondsElectron Capture100.00%
Alpha Decay~ 1.2×10-3 %
1136.6 secondsElectron Capture100.00%
Alpha Decay3.3×10-7 %
1142.1 secondsElectron Capture with
delayed Proton Emission
No Data Available
Electron Capture100.00%
114m6.2 secondsElectron Capture91.00%
Isomeric Transition9.00%
1151.3 minutesElectron Capture100.00%
1162.91 secondsElectron Capture100.00%
1172.22 minutesElectron Capture100.00%
11813.7 minutesElectron Capture100.00%
118m8.5 minutesElectron Capture< 100.00%
Isomeric TransitionNo Data Available
11919.1 minutesElectron Capture100.00%
12081.6 minutesElectron Capture100.00%
120m53 minutesElectron Capture100.00%
1212.12 hoursElectron Capture100.00%
1223.63 minutesElectron Capture100.00%
12313.2235 hoursElectron Capture100.00%
1244.1760 daysElectron Capture100.00%
12559.407 daysElectron Capture100.00%
12612.93 daysElectron Capture52.70%
Beta-minus Decay47.30%
127STABLE--
12824.99 minutesBeta-minus Decay93.10%
Electron Capture6.90%
1291.57×10+7 yearsBeta-minus Decay100.00%
13012.36 hoursBeta-minus Decay100.00%
130m8.84 minutesBeta-minus Decay16.00%
Isomeric Transition84.00%
1318.0252 daysBeta-minus Decay100.00%
1322.295 hoursBeta-minus Decay100.00%
132m1.387 hoursIsomeric Transition86.00%
Beta-minus Decay14.00%
13320.83 hoursBeta-minus Decay100.00%
133m9 secondsIsomeric Transition100.00%
13452.5 minutesBeta-minus Decay100.00%
134m3.52 minutesIsomeric Transition97.70%
Beta-minus Decay2.30%
1356.58 hoursBeta-minus Decay100.00%
13683.4 secondsBeta-minus Decay100.00%
136m46.9 secondsBeta-minus Decay100.00%
13724.5 secondsBeta-minus Decay100.00%
Beta-minus Decay with
delayed Neutron Emission
7.14%
1386.23 secondsBeta-minus Decay100.00%
Beta-minus Decay with
delayed Neutron Emission
5.56%
1392.280 secondsBeta-minus Decay100.00%
Beta-minus Decay with
delayed Neutron Emission
10.00%
1400.86 secondsBeta-minus Decay100.00%
Beta-minus Decay with
delayed Neutron Emission
9.30%
1410.43 secondsBeta-minus Decay100.00%
Beta-minus Decay with
delayed Neutron Emission
21.20%
142222 millisecondsBeta-minus Decay100.00%
Beta-minus Decay with
delayed Neutron Emission (suspected)
No Data Available
143130 millisecondsBeta-minus Decay (suspected)No Data Available
144> 300 nanosecondsBeta-minus Decay (suspected)No Data Available
145> 407 nanosecondsBeta-minus DecayNo Data Available
Beta-minus Decay with
delayed Neutron Emission
No Data Available