A 1.0-mCi source of 32/15P (in NaHPO4), a emitted, is implanted in a tumor where it is

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A 1.0-mCi source of 32/15P (in NaHPO4), a β emitted, is implanted in a tumor where it is to administer 36Gy. The half-life of 32/15P is 14.3days, and 1mCi delivers about 10mGy/min, approximately how long should the source remain implanted?
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