Physics

Problem

^{192}\text{Ir}

radiography source is shipped from the supplier to a factory. The transit time is

15\,\text{days}

. If the source must show an activity of

2.0\,\text{Ci}

on arrival and the half-life of

^{192}\text{Ir}

74\,\text{days}

, determine the activity the supplier must dispatch.