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Parent–daughter decay (secular / transient)

A₁ = 77.72 MBq

A2(t)=A1(0)λ2λ2−λ1(e−λ1t−e−λ2t)A_2(t)=A_1(0)\frac{\lambda_2}{\lambda_2-\lambda_1}\left(e^{-\lambda_1 t}-e^{-\lambda_2 t}\right)

Bateman solution for daughter activity starting from a pure parent.

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