Helium-4
Helium-4 ( or ) is a non-radioactive isotope of the element helium. It is by far the most abundant of the two naturally occurring isotopes of helium, making up about 99.
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liquid helium 3-helium 4 mixture氦3氦4溶液
helium 3-helium 4 mixture氦3氦4混合体
Helium-3 and Helium-4 Mixtures氦
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