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Find the ratio of the mass needed to gen...

Find the ratio of the mass needed to generate `1 muCi` of `""_88^236Ra (t_(1//2) = 1622 yr)` to that for `1 muCi` of `""_86^232Rn (t_(1//2) = 3.825 d)`.

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`1.58 xx 10^5`
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