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Isotopes of the Element Antimony

[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
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 nanoseconds   Beta-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