Jisho

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ほうしゃせいどうたい 放射性同位体
Noun
1. radioisotope
Wikipedia definition
2. RadionuclideA radionuclide is an atom with an unstable nucleus, characterized by excess energy available to be imparted either to a newly created radiation particle within the nucleus or via internal conversion. During this process, the radionuclide is said to undergo radioactive decay, resulting in the emission of gamma ray(s) and/or subatomic particles such as alpha or beta particles. These emissions constitute ionizing radiation. Radionuclides occur naturally, or can be produced artificially.
Read “Radionuclide” on English Wikipedia
Read “放射性同位体” on Japanese Wikipedia
Read “Radionuclide” on DBpedia

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