Radioactive elements. These may be subdivided into natural radionuclides such as radium or uranium which are normally present in the earth, or artificial radionuclides which are not normally present (or normally present in very small amounts) and are produced by nuclear fission.
Radioactive material capable of giving off radiant energy in the form of particles or rays as alpha, beta and gamma rays by the disintegration of atomic nuclei.
Any man-made or natural element that emits radiation and that may cause cancer after many years of exposure through drinking water.
Radionuclides are unstable nuclides of a particular atomic species that return to stability by emitting ionizing radiation. They may arise naturally or as a result of human activities. Radionuclides are pollutants of interest in the Great Lakes, particularly trituim, carbon-14, strontium-90, radioiodine, cesium-137, radon-222, radium-226, uranium isotopes, and plutonium isotopes.
Elements that undergo a process of natural decay. As radionuclides decay, they emit radiation in the form of alpha or beta particles and gamma photons. Radiation can cause adverse health effects, such as cancer, so limits are placed on radionuclide concentrations in drinking water.
A radioactive nuclide that disintegrates with the emission of electromagnetic radiation.
Radioactive chemicals. Radionuclides are used in making bone scans.
An unstable isotope of any chemical element that decays or disintegrates spontaneously, emitting radiation.
"Versions" of chemical elements that are not stable, or in other words, are susceptible to undergoing radioactive decay.
Radioactive isotopes resulting from (1) the fission of heavy nuclei of elements such as uranium and plutonium, or (2) the reaction of neutrons with stable nuclei.
An element that can spontaneously emit an alpha particle, beta rays and/or gamma rays upon disintegration of its atomic nucleus, emitting radiation or fast atomic particles.
Nuclides that emit radioactivity (alpha, beta, or gamma particles) or fission into smaller nuclides.
Radioactive elements or atoms.
a material with an unstable atomic nucleous that spontaneously decays or disintegrates producing radiation. Distinct radioactive particles coming from both natural sources and human activities. Can be very long lasting as soil or water pollutants.
Radioactive isotopes or unstable forms of elements.
Nuclides with an unstable nucleus.
Unstable atoms with constantly degenerating nuclei. They give off alpha, beta or gamma radiation until they achieve a stable state. These substances have chemical properties and the body uses them chemically.
Radionuclides are atoms that emit radiation and, like heavy metals, are naturally present in rocks and soils. They may also be human-made. Radionuclides tend to accumulate in the bones and muscles of animals and people. Natural radionuclides in the Canadian North include polonium and uranium.
Radioactive substances injected into the body that release particles of energy. Sophisticated scanning technologies track these particles as they enter various body tissues.
Radioactive contaminants (non radon). Includes combined radium -226/-228, (adjusted) gross alpha, beta particle and photon radioactivity, and uranium.