Radium being a member of the uranium series occurs in uranium ores....

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Radium being a member of the uranium series occurs in uranium ores. If the half lives of uranium and radium are respectively \( 4.5 \times 10^{9} \) and 1620 years calculate the \( \frac{N_{\text {radiun }}}{N_{\text {Uranium }}} \) in Uranium ore at equlibrium.
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