Chemistry

Problem

A radioactive parent nuclide P has half-life

T_{1/2}^{(P)}=30\,\text{years}

and decays to a daughter nuclide D whose half-life is

T_{1/2}^{(D)}=6\,\text{h}

. After secular equilibrium has been established, calculate the ratio

\dfrac{N_D}{N_P}

of the number of daughter nuclei to parent nuclei.