The weight of TNT which would release the same amount of energy as a particular nuclear explosion. One ton of TNT releases approximately 1.2 billion calories (that is, 5.1 kiloJoules per gram). Nuclear explosions are usually measured in kilotons (KT) or megatons (MT).
A metric ton is 1,000 kilograms. This is approximately 2,200 pounds, and very nearly equal to a British ton (2,240 pounds). The U.S. tone is 2,000 pounds.
A nuclear weapon that gets a large part of its explosive power from fusion reactions.
A nuclear reactor that is configured to operate with an external source of neutrons to supplement internally generated neutrons to maintain the chain reaction.
The spontaneous splitting of the nucleus into two new nuclei, generally with the emission of one or more neutrons and the release of energy.