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problem43_64 - so small in comparison with the half-life...

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43.64: a) = = × × × - Gy 0.0682 kg) 0 . 70 ( ) eV J 10 (1.602 MeV) 10 77 . 4 ( ) 10 25 . 6 ( 19 6 12 6.82 rad. b) (20)(6.82 rad)=136 rem = × = = Bq 10 17 . 1 ) 2 ln( u λ (c) 9 2 1 T A m N d) mCi. 31.6 s, 10 34 . 5 Bq 10 17 . 1 10 25 . 6 3 9 12 × = × × about an hour and a half. Note that this time is
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Unformatted text preview: so small in comparison with the half-life that the decrease in activity of the source may be neglected....
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