Department of Natural Sciences

Clayton College & State University

                                                                                                                                                                                                                                       November 12, 2003

 

Physics 3650 – Quiz 9

 

 

Name  ___SOUTION__________________________________

 

  1. Radioactive phosphorus-32 has been used to study bone metabolism and for the treatment of blood diseases. What is the activity of a sample of 5 x 1016 atoms if it has a half-life of 14.3 days?

 

 

l = ln (2) / T1/2

 

R = l N = (ln (2) N )/ T1/2

 

R = (0.693) (5 x 1016)/ (14.3 x 24 x 3600 s) = 2.80 x 1010 Bq = 0.757 Ci