Germanium (32Ge) has five naturally occurring isotopes, 70Ge, 72Ge, 73Ge, 74Ge, and 76Ge. Of these, 76Ge is very slightly radioactive, undergoing double beta decay with a half-life of 2.02 × 1021 years (over 100 billion times the age of the universe).
Germanium (32Ge) has five naturally occurring isotopes, 70Ge, 72Ge, 73Ge, 74Ge, and 76Ge. Of these, 76Ge is very slightly radioactive, undergoing double beta decay with a half-life of 2.02 × 1021 years (over 100 billion times the age of the universe).
Source: Wikipedia "Isotopes of germanium" · CC BY-SA 4.0
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