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One milligram of thorium emits 22alpha p...

One milligram of thorium emits `22alpha` particles per minute per unit solid angle. Calculate average life of thorium. Atomic weight of Thorium is 232.

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The correct Answer is:
`1.783xx10^(10)yrs`
Number of atoms in 1 miligrams of thorium
`N=(6.023xx10^(23))/232xx10^(-3)`
`(dN)/(dt)=22xx4pi` alpha particles/minute.
Use `(dN)/(dt)=lambdaN and tau=1/(lambda) "minute"`
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