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A source contains two phosphorus radionu...

A source contains two phosphorus radionuclei `._15^32P (T_(1//2) =14.3 d)` and `._15^33P (T_(1//2) = 25.3 d)`. Initially, 10% of the decay come from `._15^33P`. How long one must wait until 90% comes from it?

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The correct Answer is:
209 d
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