| http://www.w3.org/ns/prov#value | - Helium-3, for instance, is a non-radioactive isotope with multiple uses, including efforts to develop nuclear fusion reactors and monitoring to prevent illegal nuclear material from being smuggled into the U.S. Another, californium-252, is used for oil exploration, to help start-up nuclear power reactors, and in mass spectroscopy, a mainstay analytical tool in chemistry, astronomy, and other field
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