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… Radioactivity … The property possessed by some elements … of the decay (or disintegration) of an unstable atom . Radioactivity is also the term used to describe the rate at which radioactive material emits radiation . Radioactivity is measured in curies (Ci) , becquerels (Bq) , …

Waste, radioactive … Radioactive materials at the end of their useful life or in a product that is no longer useful and requires proper disposal. See High-level radioactive waste , Low-level radioactive waste , and Spent (depleted or used) nuclear fuel . …

Radioactive decay … The spontaneous transformation of one radionuclide into one or more decay products (also known as “daughters”). This transformation is commonly characterized by the emission of an alpha particle, a beta particle, or gamma ray photon(s) …

… or “ daughter products ”), accompanied by a decrease in radioactivity (compared to the parent material). This …

… Induced radioactivity … Radioactivity that is created when stable substances are … isotope cobalt-60 under neutron bombardment. … Induced radioactivity …

Radioactive contamination … Undesirable radioactive material (with a potentially harmful effect) that is either airborne or deposited in (or on the surface of) structures, objects, soil, water, or living organisms (people, animals, or plants) in a …

Radioactive series … A succession of nuclides, each of which transforms by radioactive disintegration into the next until a stable nuclide results. The first member is called the parent, the intermediate members are called daughters, and the final stable …

… Most low-level waste fades away to natural levels of radioactivity in months or years. Virtually all of it … spent fuel. Spent fuel is highly radioactive, and this radioactivity produces a lot of heat. Spent fuel, after … the spent fuel cools down and also begins to lose its radioactivity through radioactive decay, which we've already …

… Commission (NRC) does not regulate all sources of radioactivity; see Who Regulates Radioactive Materials and …

… Airborne radioactivity area … As defined in Title 10, Section … of Federal Regulations ( 10 CFR 20.1003 ), the airborne radioactivity area is a room, enclosure, or area in which … and Information for Radiation Workers . … Airborne radioactivity area …