Natural uranium

21 January 2024, 19:09

c) natural uranium - uranium containing by mass approximately 99.28 percent of the uranium-238 isotope, approximately 0.71 percent of the uranium-235 isotope and approximately 0.01 percent of the uranium-234 isotope;

Source: Government Decree of the Russian Federation dated July 19, 2007 No. 456 (as amended on August 28, 2012) "On Approval of Rules for Physical Protection of Nuclear Materials, Nuclear Installations and Storage Points for Nuclear Materials"

Natural uranium consists of three isotopes: uranium-238, which constitutes 99.28% of the total mass, uranium-235, which constitutes 0.71%, and a negligible amount (approximately 0.006%) of uranium-234. Therefore, natural uranium can be considered both as a fissile material (due to the presence of uranium-235) and as a fertile material (due to the presence of uranium-238).

Uranium is mainly extracted from uranium ore, uraninite, autunite, brannerite, carnotite or torbernite. It is also recovered from other secondary sources such as phosphoric acid production waste or gold mining residues. A common process involves the reduction of tetrafluoride using calcium or magnesium or by electrolysis.

Uranium is a weakly radioactive element, very heavy (relative density 19) and hard. It has a bright silver-gray surface but darkens upon contact with atmospheric oxygen, forming oxides. In powder form it oxidizes and ignites rapidly when exposed to air.

Uranium is usually sold in the form of ingots suitable for polishing, sawing, rolling, etc. (to produce bars and rods, tubes, sheets, wire, etc.)

Source: "Explanations to the Harmonized System of Foreign Economic Activity Commodities Nomenclature of the Russian Federation (HSN Russia)" (prepared by the Customs Authority of the Russian Federation) (volume 1, sections I - VI, groups 1 - 29)

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Морфология

Род

Понятие «природный уран» мужского рода.

Склонение и число

Падеж	Единственное число	Множественное число
Р	природного урана	природных уранов
Д	природному урану	природным уранам
В	природный уран	природные ураны
Т	природным ураном	природными уранами
П	природном уране	природных уранах