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Helium Isotopes

Stable Helium Isotopes - He Isotopes
Nominal mass Accurate
% Natural abundance Chemical form Enrichment available %

3 He 3.01602931 (4) 0.000137 (3) N/A N/A

4 He 4.00260324 (5) 99.999863 (3) N/A N/A
Helium has two isotopes but it consists almost entirely of He-4 with natural He only containing just over 0.0001% of He-3. Thousands of liters of He-3 are used annually in cryogenic applications and He-3 is also used as a neutron counter in nuclear application. He-3 is also applied in magnetic resonance imaging.
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