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What mass of Ra^(226) whose t(1//2) = 16...

What mass of `Ra^(226)` whose `t_(1//2) = 1620` years will give the activity of 1 millicurie?

Text Solution

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Activity `=(0.693)/(t_(1//2))xx(W)/(At.wt.)xx6.023xx10^(23)`
`implies3.7xx10^(7)=(0.693)/(1620xx365xx24xx3600)xx(W)/(256)xx6.023xx10^(23)`
`:.W=10^(-3)g`.
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