Part of the problem is that as the radioactive substance decays, most of the electrons miss the silicon surface.
If a nucleus has too many protons for its number of neutrons, it will be radioactive .
It is so hot and radioactive that the miners use remote control equipment.
In reality all they did was make my blood radioactive before taking gamma photographs.
It relies on an analysis of how much of a radioactive isotope has decayed into its daughter isotope.
Depleted uranium is a radioactive heavy metal, which is also chemically toxic.
The periodic table has since been expanded to 81 stable and 31 radioactive elements.
Carbon - 14 is radioactive and it is this radioactivity which is used to measure age.
Operated by the Royal Observer Corps, it was also charged with monitoring lethal radioactive fallout.
This three-year project was to lead to the discovery of the causes of radioactive emissions.