Isotopes of germanium

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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).

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