Question

A radioisotope has an initial activity of 5 millicurie. 48hours later the observed activity is 4 millicurie. Determine

a) the half-life of the radioisotope

b) the initial number of nuclides in the radioisotope

Answer 1

1. Half life ;$48×\frac {1} {24}=2$ half lives.

2. The number of nuclei N as a function of time is N ;$N_0e−λt,$ =32 nucleotides