A sample of .^(18)F is used internally a...

A sample of `.^(18)F` is used internally as a medical diagnostic tool to look for the effects of the positron decay `(T_(1//2) =110 min)` . How long does it take for `99%` of the `.^(18)F` to decay?

12.4 h

`12.0 h

12.2 h

12.5 h

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