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Definition of Radioisotope

Babylon English

radioactive isotope (Chemistry)
Radioisotope Definition from Language, Idioms & Slang Dictionaries & Glossaries
hEnglish - advanced version

n : a radioactive isotope of an element; produced either naturally or artificially

WordNet 2.0

1. a radioactive isotope of an element; produced either naturally or artificially
(hypernym) isotope
(hyponym) tracer
Radioisotope Definition from Science & Technology Dictionaries & Glossaries
NRC Nuclear Energy Glossary
An unstable isotope of an element that decays or disintegrates spontaneously, emitting radiation. Approximately 5,000 natural and artificial radioisotopes have been identified.
A service to the public by The U.S. Nuclear Regulatory Commission (NRC).
EIA Energy Glossary
A radioactive isotope.
Source: Energy Information Administration, 2006
Radioisotope Definition from Encyclopedia Dictionaries & Glossaries
English Wikipedia - The Free Encyclopedia
A radionuclide (radioactive nuclide, radioisotope or radioactive isotope) is an atom that has excess nuclear energy, making it unstable. This excess energy can either create and emit, from the nucleus, new radiation (gamma radiation) or a new particle (alpha particle or beta particle), or transfer this excess energy to one of its electrons, causing it to be ejected (conversion electron). During this process, the radionuclide is said to undergo radioactive decay. These emissions constitute ionizing radiation. The unstable nucleus is more stable following the emission, but sometimes will undergo further decay. Radioactive decay is a random process at the level of single atoms: it is impossible to predict when one particular atom will decay. However, for a collection of atoms of a single element the decay rate, and thus the half-life (t1/2) for that collection can be calculated from their measured decay constants. The duration of the half-lives of radioactive atoms have no known limits; the time range is over 55 orders of magnitude.

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Radioisotope Definition from Entertainment & Music Dictionaries & Glossaries
English to Federation-Standard Golic Vulcan
Radioisotope Definition from Medicine Dictionaries & Glossaries
NCI Dictionary of Cancer Terms
An unstable element that releases radiation as it breaks down. Radioisotopes can be used in imaging tests or as a treatment for cancer.
A Service of the National Cancer Institute.
CDC Radiological Terms
isotopes of an element that have an unstable nucleus. Radioactive isotopes are commonly used in science, industry, and medicine. The nucleus eventually reaches a stable number of protons and neutrons through one or more radioactive decays. Approximately 3,700 natural and artificial radioisotopes have been identified.
Source: Centers for Disease Control and Prevention (CDC) ( About )
Dictionary of Medicine (Shahram)
A radioactive isotope. (An isotope is an alternate version of a chemical element that has a different atomic mass).