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In the thorium decay series that begins ...

In the thorium decay series that begins with `.^(232)Th,.^(228)Th` alpha-decays into `.^(224)Ra` with a half life of 1.9yr. `.^(224)Ra` alpha-decays into `.^(230)Rn` with a half life of 3.7d, which in turn decays into `.^(216)Po` with a half life of 55s. If the nuclides are in radioactive equilibrium in a mineral sample that contains 1.0g of `.^(220)Rn`, what are the masses of `.^(224)Ra` abd `,^(228)Th` in the sample?

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5.9kg,1149kg
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