DU STORAGE. “About 95% of the depleted uranium … is stored … in steel cylinders in open air yards close to enrichment plants. Each … up to 12.7 tonnes of UF6. In the U.S. alone, 560,000 tonnes of depleted UF6 had accumulated by 1993. In 2005, 686,500 tonnes in 57,122 storage cylinders” at three US locations.
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