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Long-lived fission product
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<p>Long-lived fission products (LLFPs) are radioactive materials with a long <a href="/facts/Half-life/kGVH8BAB">half-life</a> (more than 200,000 years) produced by <a href="/facts/Nuclear_fission/LfkIylvm">nuclear fission</a> of <a href="/facts/Uranium/n2sGWBzU">uranium</a> and <a href="/facts/Plutonium/4bUw9zH3">plutonium</a>. Because of their persistent <a href="/facts/Ionizing_radiation/vw0d9GaT">radiotoxicity</a>, it is necessary to isolate them from humans and the biosphere and to confine them in nuclear waste repositories for geological periods of time. The focus of this article is radioisotopes (<a href="/facts/Radionuclide/5WpCfbdq">radionuclides</a>) generated by <a href="/facts/Fission_reactor/8xqjIbge">fission reactors</a>. </p>