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30 November, 01:43

Strontium-85 has a half-life of 65 days. how long will it take for the radiation level of strontium-85 to drop to one-fourth of its original level?

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  1. 30 November, 05:29
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    A half life is defined as the amount of time it would take for a material to reduce to half of its original amount. To get to one-fourth of its original level, that would require two half lifes (since 1/2 * 1/2 = 1/4). Therefore, two half lives for Strontium-85 is 2*65 = 130 days.
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