英和和英

出典:『Wikipedia』 (2011/01/28 13:56 UTC 版)

英語による解説

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Neutron activation is the process in which neutron radiation induces radioactivity in materials, and occurs when atomic nuclei capture free neutrons, becoming heavier and entering excited states. The excited nucleus often decays immediately by emitting particles such as neutrons, protons, or alpha particles. The neutron capture, even after any intermediate decay, often results in the formation of an unstable activation product. Such radioactive nuclei can exhibit half-lives ranging from small fractions of a second to many years. An example of this kind of a nuclear reaction occurs in the production of cobalt-60 within a nuclear reactor: