What fraction of an old sample of Ra obtained from 238U is 2

What fraction of an old sample of Ra obtained from ^238U is ^210Po? How old is old?

210Pb (t1/2 = 22.6 ± 0.1 yrs)

The significant 210Pb deficits measured their eruption ages are less than 100 yrs.

210Po (t1/2 = 138.4 ± 0.1 days) and older than 2 years.

226Ra (t1/2 = 1599 ± 4 yrs ). and eruption ages of less than 8 ka.

$What fraction of an old sample of Ra obtained from ^238U is ^210Po? How old is old?Solution210Pb (t1/2 = 22.6 ± 0.1 yrs) The significant 210Pb deficits measure$

What fraction of an old sample of Ra obtained from 238U is 2

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