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Isotopes of the Element Antimony

[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
12157.21%STABLE
12342.79%STABLE

Known Isotopes

Mass NumberHalf-lifeDecay ModeBranching Percentage
1031.5 microsecondsElectron Capture (suspected)No Data Available
1040.44 secondsElectron Capture100.00%
Electron Capture with
delayed Proton Emission
< 7.00%
Proton Emission< 1.00%
1051.22 secondsElectron Capture99.00%
Proton Emission1.00%
1060.6 secondsElectron CaptureNo Data Available
1074.0 secondsElectron Capture100.00%
1087.4 secondsElectron Capture100.00%
10917.0 secondsElectron Capture100.00%
11023.0 secondsElectron Capture100.00%
11175 secondsElectron Capture100.00%
11251.4 secondsElectron Capture100.00%
1136.67 minutesElectron Capture100.00%
1143.49 minutesElectron Capture100.00%
11532.1 minutesElectron Capture100.00%
11615.8 minutesElectron Capture100.00%
116m60.3 minutesElectron Capture100.00%
1172.80 hoursElectron Capture100.00%
1183.6 minutesElectron Capture100.00%
118m5.00 hoursElectron Capture100.00%
11938.19 hoursElectron Capture100.00%
119m0.85 secondsIsomeric Transition100.00%
12015.89 minutesElectron Capture100.00%
120m5.76 daysElectron Capture100.00%
121STABLE--
1222.7238 daysBeta-minus Decay97.59%
Electron Capture2.41%
122m4.191 minutesIsomeric Transition100.00%
123STABLE--
12460.20 daysBeta-minus Decay100.00%
124m93 secondsIsomeric Transition75.00%
Beta-minus Decay25.00%
124m120.2 minutesIsomeric Transition100.00%
1252.75856 yearsBeta-minus Decay100.00%
12612.35 daysBeta-minus Decay100.00%
126m19.15 minutesBeta-minus Decay86.00%
Isomeric Transition14.00%
126m1≈ 11 secondsIsomeric Transition100.00%
1273.85 daysBeta-minus Decay100.00%
1289.01 hoursBeta-minus Decay100.00%
128m10.4 minutesBeta-minus Decay96.40%
Isomeric Transition3.60%
1294.40 hoursBeta-minus Decay100.00%
129m17.7 minutesBeta-minus Decay85.00%
Isomeric Transition15.00%
13039.5 minutesBeta-minus Decay100.00%
130m6.3 minutesBeta-minus Decay100.00%
13123.03 minutesBeta-minus Decay100.00%
1322.79 minutesBeta-minus Decay100.00%
132m4.10 minutesBeta-minus Decay100.00%
1332.34 minutesBeta-minus Decay100.00%
1340.78 secondsBeta-minus Decay100.00%
134m10.07 secondsBeta-minus Decay100.00%
Beta-minus Decay with
delayed Neutron Emission
0.09%
1351.679 secondsBeta-minus Decay100.00%
Beta-minus Decay with
delayed Neutron Emission
22.00%
1360.923 secondsBeta-minus Decay100.00%
Beta-minus Decay with
delayed Neutron Emission
16.30%
137492 millisecondsBeta-minus Decay100.00%
Beta-minus Decay with
delayed Neutron Emission
49.00%
138350 millisecondsBeta-minus Decay with
delayed Neutron Emission
72.00%
Beta-minus Decay100.00%
13993 millisecondsBeta-minus Decay100.00%
Beta-minus Decay with
delayed Neutron Emission
90.00%
140> 407 nanosecondsBeta-minus DecayNo Data Available
Beta-minus Decay with
delayed Neutron Emission
No Data Available
Beta-minus Decay with delayed
Double Neutron Emission
No Data Available