How old is a bottle of **** if the tritium activity is 25 counts/hr and new **** has an activity 200 counts/hr The half life if tritium is 12.3 years.?

How old is a bottle of **** if the tritium activity is 25 counts/hr and new **** has an activity 200 counts/hr The half life if tritium is 12.3 years.?
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The lightest radioactive element is (1) deuterium (2) polonium (3) tritium (4) uranium

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