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It's Elemental
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[Return to Helium's Data Page]

Most of the isotope data on this site has been obtained from the National Nuclear Data Center. Please visit their site for more information.

Isotopes of the Element Helium with a Known Natural Abundance

Mass NumberNatural AbundanceHalf-life
30.000137%Stable
499.999863%Stable

All Known Isotopes of the Element Helium

Mass NumberHalf-lifeDecay ModeBranching Percentage
3Stable--
4Stable--
57.61833×10-22 secondsAlpha Decay100.00
Neutron Emission100.00
6806.7 millisecondsBeta-minus Decay100.00
72.85688×10-21 secondsNeutron EmissionNo Data Available
8119.0 millisecondsBeta-minus Decay100.00
Beta-minus Decay with
delayed Neutron Emission		16.00
97.03231×10-21 secondsNeutron Emission100.00
102.68882×10-21 secondsDouble Neutron EmissionNo Data Available

This page is maintained by Steve Gagnon.

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