The test may be done but the learning doesn’t stop! I’ve found a great summary of the basics that you need to know about radioactivity, courtesy of the Lawrence Berkeley National Laboratory. The crucial page is at https://www2.lbl.gov/abc/Basic.html but you may like to take a look at the entire ABC’s of Nuclear Science section.
For those of you who want to explore the medical uses of radioactivity in a bit more detail, I’ve found a great list of radioisotopes that are used in medical applications. It comes from the back pages of Introduction to Radiation Protection by Claus Grupen (Springer, 2010) and has been made freely available by CERN. You can find full details here or you can simply download the medical radioisotopes extract by clicking here.
Mr Tarrant's physbang 'blog 