a natural or artificial atom with an unstable nucleus which will decay, forming daughter products and emitting alpha, beta or gamma radiation as they decay
A radioactive species of atom characterized by the makeup of its nucleus (the number of protons, the number of neutrons, and the energy content) which causes the nucleus to be unstable
An unstable isotope of an element that decays or disintegrates spontaneously, emitting radiation Approximately 5,000 natural and artificial radioisotopes have been identified
An unstable isotope of an element that decays or disintegrates spontaneously, emitting radiation
A radioactive nuclide Often used to distinguish radioisotopes of different chemical elements, such as iodine 131 and uranium 239
an unstable nuclide capable of spontaneous transformation into other nuclides through changes in its nuclear configuration or energy level; this transformation is accompanied by the emission of photons or particles
A radioactive nuclide An unstable isotope of an element that decays or disintegrates spontaneously, emitting radiation
Radioactive particle, man-made (anthropogenic) or natural, with a distinct atomic weight number Can have a long life as soil or water pollutant Source: US EPA
A radioactive nuclide; an atom which emits corpuscular or electromagnetic radiation
Radioactive particle, man-made or natural, with a distinct atomic weight number Can have a long life as soil or water pollutants
A radioactive species of an atom For example, tritium, strontium 90, and uranium 235 are all radionuclides
An atom which is unstable and which may undergo spontaneous decay to another atom by emission or ionising
Radionuclides are materials that produce ionization radiation, such as X-rays, gamma rays, alpha particles, and beta particles