Radionuclides 

Radioactive isotopes are referred to as radionuclides.   Radionuclides are unstable and, in an effort to become stable, release energy.  This release of energy comes from the release of particles or electromagnetic waves as the radioactive atoms "decay" or decompose.  The three main types of radiation, or releases of energy, are alpha, beta and gamma radiation.

A list of common human-made radionuclides, along with their chemical symbol, are listed below.  All human-made radionuclides detected by ESER Surveillance Program are listed in quarterly and annual reports.