** The values of p
and b for
a particular radioactive isotope in humans is 0.080 day
and 0.050 day respectively. What is the
effective half life of this isotope?**

This problem can be done in different ways, but the following solution is the simplest to calculate. First we will find the effective decay constant, eff, and then use this to caculate Teff.

The effective decay constant, eff, is: