That which is subject to spontaneously emitting alpha, beta, and sometime gamma rays.
Any material Ñ solid, liquid or gas Ñ that emits radiation spontaneously. DRH Rule 1200-2-4-.04
A substance containing unstable nuclei exceeding a certain concentration limit. It is also called prescribed radioactive substance, radioactive nuclear substance or nuclear substance.
Any material having a specific activity greater than 0.002 microcuries per gram, as defined by 49 C.F.R. part 173.4-3(y).
Any substance which gives off radiation.
For the purposes of this Manual, radioactive material includes any material, equipment or system component determined to be contaminated or suspected of being contaminated. Radioactive material also includes activated material, sealed and unsealed sources, and material that emits radiation.
Any material, solid, liquid or gas, which emits radiation spontaneously.
Material designated in national law or by a regulatory body as being subject to regulatory control because of its radioactivity.
Any compound or element which may emit any or all of the following: alpha and beta particles, electrons, photons neutrons and gamma and all other emissions which produce ionization directly or indirectly.
Any material, or combination of materials, that spontaneously emits ionizing radiation and has a specific activity greater than 0.002 microcuries per gram. Those materials that emit ionizing radiation.
Also called radioactive substance. As used in the brachytherapy treatment of cancer, a radioactive material is sealed inside a seed or pellet and placed inside the body, in or near a tumor. The radiation material used in brachytherapy comes from radioactive iodine 125, strontium 89, phosphorous, palladium, cesium, iridium, phosphate, or cobalt.