In accordance with the definition of the German Atomic Ability to do work or diffuse heat. The unit of energy is th... Act, nuclear See 'nuclear fuel'. consists of special fissile substances in the form of
- plutonium-239 and plutonium-241,
- with the isotopes 235 or 233 Uranium in which the percentage of the fissionable isotope U...,
- substances containing one or several of the aforementioned substances,
- substances with the aid of which a self-perpetuating Self-perpetuating reaction. In a fission chain reaction, a f... can be upheld in a suitable plant (System used to initiate, maintain and control a fission chai...) and which are determined in an ordinance having the force of Low active waste; usually with an activity concentration of ....