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A bulk unit dose of 99mTc is reading 300mCi upon arrival at 09:00; How long will it take for the unit dose to decay

A bulk unit dose of 99mTc is reading 300mCi upon arrival at 09:00; How long will it take for the unit dose to decay to 75mCi? Note: t 1/2 of 99mTc is 6hours

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