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There, the ore gets turned into uranium oxide or what is commonly known as “yellowcake” because of its bright lemony color.

Still, a prodigious amount of nuclear material remains there: The reactor halls hold 1380 tons of fresh and spent uranium oxide fuel, and two repositories store an additional 2100 tons of spent fuel laced with nasty long-lived radionuclides—the ingredients, many Ukrainians fear, of a “dirty bomb” that would use conventional explosives to spread radioactive isotopes.

The term “uranium glass” generally describes glass with uranium oxide, which glows under a black light.

With a thermal conductivity higher than traditional fuel made from uranium oxide, uranium silicide is deemed more efficient and safer.

Satellite imagery taken in March depicts activity at the Pyongsan Uranium Concentrate Plant – a site where experts think North Korea is creating uranium oxide, one of the building blocks of nuclear fuel, according to NBC News.