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In page Enriched uranium:
"Enriched uranium is a type of uranium in which the percent composition of uranium-235 (written 235U) has been increased through the process of isotope separation. Naturally-occurring uranium is composed of three major isotopes: uranium-238 (238U with 99.2739–99.2752% natural abundance), uranium-235 (235U, 0.7198–0.7202%), and uranium-234 (234U, 0.0050–0.0059%).[citation needed] 235U is the only nuclide existing in nature (in any appreciable amount) that is fissile with thermal neutrons.[1]
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