To be considered 'enriched', the uranium-235 fraction should be between 3% and 5%. This process produces huge quantities of uranium that is depleted of uranium-235 and with a correspondingly increased fraction of uranium-238, called depleted uranium or 'DU'. To be considered 'depleted', the uranium-235 isotope concentration should be no more than 0.3%. The price of uranium has risen since 2001, so enrichment tailings containing more than 0.35% uranium-235 are being considered for re-enrichment, driving the price of depleted uranium hexafluoride above $130 per kilogram in July 2007 from $5 in 2001.
To be considered ' enriched ' , the uranium-235 fraction should be between 3 % and 5 % . This process produces huge quantities of uranium that is depleted of uranium-235 and with a correspondingly increased fraction of uranium-238 , called depleted uranium or ' DU ' . To be considered ' depleted ' , the uranium-235 isotope concentration should be no more than 0.3 % . The price of uranium has risen since 2001 , so enrichment tailings containing more than 0.35 % uranium-235 are being considered for re - enrichment , driving the price of depleted uranium hexafluoride above $ 130 per kilogram in July 2007 from $ 5 in 2001 .
In what year did the cost of uranium notably begin to increase?
In what year did the cost of uranium notably begin to increase ?
2001
2001