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12 November, 18:04

Determine the total time that must elapse until only ¼ of an original sample of the radioisotope Rn-222 remains unchanged.

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  1. 12 November, 20:14
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    Half life of Rn-222 is 3.82 days, for 1/4th of the original two half lifves have to pass so it is 3.82 x 2 = 7.64 days
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