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An isotope of phosphorus called P-32 is radioactive. It decays with half life of 14.3 days with the emission of beta particle. A 1.0 m?Ci source of P-32 is implanted in a tumor where it would deliver radiation dose of 28.6 Gy. Approximately how long should the source remain implanted in the tumor to deliver the required radiation dose? Assuming 1.0 mCi delivers 10mGy/min?

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