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Isotopes of the Element Neptunium

[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.

Known Isotopes

Mass NumberHalf-lifeDecay ModeBranching Percentage
225No Data AvailableAlpha Decay100.00%
22635 millisecondsAlpha Decay100.00%
2270.51 secondsAlpha Decay100.00%
22861.4 secondsElectron Capture60.00%
Alpha Decay40.00%
2294.0 minutesAlpha Decay68.00%
Electron Capture32.00%
2304.6 minutesElectron Capture<= 97.00%
Alpha Decay>= 3.00%
23148.8 minutesElectron Capture98.00%
Alpha Decay2.00%
23214.7 minutesElectron Capture100.00%
Alpha Decay2.0×10-4 %
23336.2 minutesElectron Capture100.00%
Alpha Decay<= 1.0×10-3 %
2344.4 daysElectron Capture100.00%
235396.1 daysElectron Capture100.00%
Alpha Decay2.6×10-3 %
236153×10+3 yearsElectron Capture86.30%
Beta-minus Decay13.50%
Alpha Decay0.16%
236m22.5 hoursBeta-minus Decay50.00%
Electron Capture50.00%
2372.144×10+6 yearsAlpha Decay100.00%
Spontaneous Fission<= 2×10-10 %
2382.117 daysBeta-minus Decay100.00%
2392.356 daysBeta-minus Decay100.00%
24061.9 minutesBeta-minus Decay100.00%
240m7.22 minutesBeta-minus Decay99.88%
Isomeric Transition0.12%
24113.9 minutesBeta-minus Decay100.00%
2422.2 minutesBeta-minus Decay100.00%
242m5.5 minutesBeta-minus Decay100.00%
2431.85 minutesBeta-minus Decay100.00%
2442.29 minutesBeta-minus Decay100.00%
245No Data AvailableNo Data AvailableNo Data Available