Radioactive decay of a radioactive substance or material can be measured by the half-life, which is the time it takes for the radioactive material to decay to half of its original amount.
Radioactive decay has three main types of decay: alpha decay (alpha emission), beta decay (positron emission), and gamma emission.
Radiation is given off from a process called radioactive decay.
Radioactive decay occurs when the original nucleus, or parent nucleus, of an unstable atom decomposes and forms a different nucleus, or the daughter nucleus.
Gamma rays have no atomic mass and no atomic number.