Chemistry Question?

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Iodine-131 is a beta emitter with a half-life of 8.070 days that is used to treat thydroid cancer. How many days are required to rid the body of 71.0% of any ingested I-131?

2007-11-28 07:33:44 · 1 answers · asked by Nick P 1 in Science & Mathematics ➔ Chemistry

1 answers

N = N0(1/2)^(t/8.070)
(1/2)^(t/8.070) = 0.31
t/8.070 = log(0.29)/log(0.5)
t = 8.070log(0.29)/log(0.5)
t ≈ 14.412 days ≈ 14 days 10 hr.

2007-11-29 19:44:46 · answer #1 · answered by Helmut 7 · 0⤊ 0⤋