Fiction:Uranium-X

Uranium-X is a form of Uranium which posesses a large amount of energy, useable for WMD's ranging up to a planet destruction bomb. Uranium-X was first discovered by a medwedian Scientist, Hans M. T. Lyndenby, in 2129 AA, when travelling through the outer Orion Arm asteroid field.

Theories
Uranium-X is told to be created when a ship's reactor exploded while the ship was travelling through the asteroid field. The plasma reacted with the Uranium-235 which is also found in the asteroid field, and a complex chemical and nuclear reaction transformed part of it into Uranium-X. Uranium-X is also found in the leftovers of planets that were destroyed by tier 3 races. This is evidence to the fact that Uranium-X is useable in several WMD's and can completely "upgrade" a race from tier 4 to tier 3, because transwarp drives powered by Uranium-X can accelerate a ship to intergalactic speeds.

Parameters
Uranium-X has a half-decay time longer than an average universe's life. Uranium-X emits an extremely high amount of Radiation and can only be stored in special chambers. Exposure to Uranium-X's radiation may lead to heavy mutations.