Stable and Unstable Elements
Every element has ç1 unstable isotope, i.e. one that undergoes radioactive decay
Most elements with Z < 92 have at least one stable isotope
Weíll examine radioactivity in terms of the transitions under which an atom decays
Radioactivity has various influences on biological tissue:
- Ionization of biological macromolecules
- Indirect effects, often via free radicals
- Medical applications: therapy, diagnostics, . . .