yeah... most introductory textbooks will have something on radioactive decay. I'm sure it is a very large field if you want to go into lots of detail. But I'm guessing for the average undergraduate course, the main things to learn are the different basic types of decay, and to be comfortable with the idea of exponential decay of the number of radioactive atoms. i.e. be able to solve simple problems, like "If I have N radioactive atoms, with activity A, then how many will remain at time t ?" Also, if you have more than one kind of radioactive atom, then the equations get slightly more complicated, but the idea is roughly the same. You can solve a differential equation in the numbers of each type of atom, taking into account the possibility that one type of atom decays into another type.