The time that it takes for half the radionuclides to disintegrate or decay is called half-life. This differs for each radioelement, ranging from fractions of a second to billions of years. For example ...

A few emit auger electrons and alpha particles, and several also emit gamma rays and X-rays during their decay. The most successful metabolic radionuclide for thyroid therapy uses iodine-131 as the ...

Iodine-131 Used to treat thyroid gland (in the neck ... This means that the beta-decay emissions can be monitored and the data used to calculate how long it has been since the material was ...