Uranium Enrichment

Uranium enrichment is a process of concentrating Uranium-235 in metallic uranium because Uranium-238 can't be involved in a nuclear chain reaction. The only way to do it yet is by using Gas Uranium Centrifuge. After the first usage, you will get LEU and after the second - HEU. But a special uranium type required to load it into Gas Uranium Centrifuge - Hexavalent Uranium Fluoride (UF6). Other types won't work.