The decay constant of \( { }^{226} \mathrm{Ra} \) is \( 1.37 \times 10^{-11} \mathrm{sec}^{-1} \...

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The decay constant of \( { }^{226} \mathrm{Ra} \) is \( 1.37 \times 10^{-11} \mathrm{sec}^{-1} \). A sample of \( { }^{226} \mathrm{Ra} \) having an activity of \( 1.5 \) millicurie will contain _______ atoms
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