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In hospitals, the radioactive isotope Fluor-18 is often used. This isotope has a half-life of 110 minutes and is mainly a β + radiator. a) What percentage of the original activity remains after 3.0 hours? b) How much energy is emitted in the event of a breakdown? c) How much energy has a preparation fluor-18 given off after 3.0 hours if its original activity was 14 GBq?
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