Physics

Problem

Plutonium-239 has a half-life of

2.41\times10^{4}\,\text{years}

and atomic mass

239\,\text{u}

. A laboratory requires a sample whose activity will be

1.0\times10^{5}\,\text{Bq}

exactly

5.0\,\text{years}

from now. Determine the mass of

^{239}\text{Pu}

that must be supplied today. \;(Take

N_A = 6.022\times10^{23}\,\text{mol}^{-1}