Inside the Uranium Underworld: Dark Secrets, Dirty Bombs

One night last spring, Amiran Chaduneli, a flea-market trader in the ex-Soviet Republic of Georgia, met with two strangers on a bridge at the edge of Kobuleti, a small town on the country’s Black Sea coast.
Over the phone, the men had introduced themselves as foreigners—one Turkish, the other Russian—and they were looking for an item so rare on the black market that it tends to be worth more, ounce for ounce, than gold. Chaduneli knew where to get it. He didn’t know that his clients were undercover cops.
From the bridge, he took them to inspect the merchandise at a nearby apartment where his acquaintance had been storing it: a lead box about the size of a smartphone, containing a few pounds of radioactive uranium, including small amounts of the weapons-grade material known as uranium-235. The stash wasn’t nearly enough to make a nuclear weapon. But if packed together with high explosives, these metallic lumps could produce what’s known as a dirty bomb—one that could poison the area around the blast zone with toxic levels of radiation.