SOIL 5813
Radioisotope Exercise
April 14, 2008

1. How much ³²P would you put into a system to assure 500 cpm after 2 months with

a. 1/10 counter efficiency
b. 10% utilization efficiency of ³²P

2. What is the half-life of a radionuclide that loses 50% of its initial activity in 20 minutes?

3. You are given 5 mC ³²P in 5 ml on 9/12/99: Determine the activity of this ³²P in uC/ml on 10/18/99

4. Find the weight in grams of ⁶⁵Zn that possesses 1 mC of activity

ANSWERS