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    { "id" : "http://dbpedia.org/resource/Uranium-235"
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        "http://www.w3.org/2000/01/rdf-schema#comment" : [ "Uranium-235 is an isotope of uranium making up about 0.72% of natural uranium. Unlike the predominant isotope uranium-238, it is fissile, i.e., it can sustain a fission chain reaction. It is the only fissile isotope that is a primordial nuclide or found in significant quantity in nature.Uranium-235 has a half-life of 703.8 million years.  It was discovered in 1935  by Arthur Jeffrey Dempster. Its (fission) nuclear cross section for slow thermal neutrons is about 584.994 barns." ] ,
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