The sample of PbSO4 which consist 1-microcurie of Pb-200 and the half-life of this sample is 21.5h. The storage period is to be determined for the activity which is required for the activity which is less than 0.001 microcurie.
According to first order of kinetics:
Here, N and No are final and initial concentrations, is decay constant and t is time.
Here, is half-life time.
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