Radioactivity is the spontaneous emission of radiation in the form of particles or high energy photons resulting from a nuclear reaction. It is also known as radioactive decay, nuclear decay, nuclear disintegration, or radioactive disintegration. While there are many forms of electromagnetic radiation , they are not always produced by radioactivity. For example, a light bulb may emit radiation in the forms of heat and light, yet it is not radioactive. A substance that contains unstable atomic nuclei is considered to be radioactive. Radioactive decay is a random or stochastic process that occurs at the level of individual atoms.
Switch to new thesaurus. Based on WordNet 3. Mentioned in? References in periodicals archive? Akhtar said the fossil belonged to the late Pleistocene period and its age was determined using a uranium-lead radioactive dating technique. Pakistan scientists 'find 1. Radioactive dating techniques allowed a team led by Fred Jourdan of Curtin University in Perth to precisely measure the age of the eruptions of the Kalkarindji volcanic province, which saw lava cover an area of more than two million square kilometres in the Northern Territory and Western Australia.
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Radiometric dating or radioactive dating is any technique used to date organic and also inorganic materials from a process involving radioactive decay. The method compares the abundance of a naturally occurring radioactive isotope within the material to the abundance of its decay products, which form at a known constant rate of decay. All these methods are based on the fact the rate at which radioactive nuclei disintegrate is unaffected by their environment, it can be used to estimate the age of any material sample or object which contains a radioactive isotope.