Krypton-81m (81mKr) is a radioactive isotope with a half-life of 13.1 s that is often used in pulmonary ventilation studies for the gamma (γ) particles it emits. How long after a patient is administered a dose of 81mKr does only 7 % of the isotope remain? (in s)  (a) 39.30 s  (b) 36.78 s  (c) 0.20 s  (d) 34.84 s

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Chapter29: Nuclear Physics
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Krypton-81m (81mKr) is a radioactive isotope with a half-life of 13.1 s that is often used in pulmonary ventilation studies for the gamma (γ) particles it emits. How long after a patient is administered a dose of 81mKr does only 7 % of the isotope remain? (in s)
 (a) 39.30 s
 (b) 36.78 s
 (c) 0.20 s
 (d) 34.84 s
 (e) 50.26 s

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