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Uranium-235 (235 U or U-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 nuclear chain reaction. It is the only fissile isotope that exists in nature as a primordial nuclide. Uranium-235 has a half-life of 703.8 million years.
Some of the mined uranium was found to have a lower concentration of uranium-235 than expected, as if it had already been in a nuclear reactor.When geologists investigated they also found products typical of a reactor.
The amount of ultimately recoverable uranium depends strongly on what one would be willing to pay for it. Uranium is a widely distributed metal with large low-grade deposits that are not currently considered profitable. As of 2015, 646,900 tonnes of reserves are recoverable at US$40 per kilogram of uranium, while 7,641,600 tonnes of reserves ...
The highest grade uranium deposits are found in the Athabasca Basin in Canada, including the two largest high grade uranium deposits in the world, Cigar Lake with 217 million pounds (99,000 t) U 3 O 8 at an average grade of 18% and McArthur River with 324 million pounds (147,000 t) U 3 O 8 at an average grade of 17%. These deposits occur below ...
Australia has 28% of the world's known uranium ore reserves [83] and the world's largest single uranium deposit is located at the Olympic Dam Mine in South Australia. [85] There is a significant reserve of uranium in Bakouma , a sub-prefecture in the prefecture of Mbomou in the Central African Republic .
This contains lists of countries by uranium production. The first two lists are compiled by the World Nuclear Association , and measures uranium production by tonnes mined. The last list is compiled by TradeTech, a consulting company which specializes in the nuclear fuel market.
This is when uranium glass reached the height of its popularity in the United States between 1958 and 1978, with more than 4 million pieces of decorative uranium produced, according to Oak Ridge ...
The world's largest deposits of uranium are found in three countries. Australia has just over 30% of the world's reasonably assured resources and inferred resources of uranium – about 1.673 megatonnes (3.69 × 10 ^ 9 lb). [46] Kazakhstan has about 12% of the world's reserves, or about 651 kilotonnes (1.4 × 10 ^ 9 lb). [62]