NOVELTY - The electricity generation apparatus comprises a container for a plasma (115) sustained by radioactive decay, a separator (160), a generator operable to generate electricity using hydrogen as a fuel, a mixture management system, a device that stores hydrogen expelled from the plasma container and is operable to deliver hydrogen to the generator at a rate dependent on electric power demand, a unit to dissociate water molecules to form hydrogen and oxygen, a unit to separate and store hydrogen, and a unit to dissociate water comprising the plasma sustained by radioactive decay.    USE - The apparatus is useful for generating electrical power.    ADVANTAGE - The apparatus is capable of efficiently generating the electrical power with improved yield.    DETAILED DESCRIPTION - The electricity generation apparatus comprises a container for a plasma (115) sustained by radioactive decay, a separator (160), a generator operable to generate electricity using hydrogen as a fuel, a mixture management system, a device that stores hydrogen expelled from the plasma container and is operable to deliver hydrogen to the generator at a rate dependent on electric power demand, a unit to dissociate water molecules to form hydrogen and oxygen, a unit to separate and store hydrogen, and a unit to dissociate water comprising the plasma sustained by radioactive decay. The plasma container comprises an inlet (150) through which water is introduced to the plasma container, and an outlet (140) through which a material comprising hydrogen and oxygen resulting from the dissociation of water molecules is exhausted from the container, and contains a radioactive gas. The separator separates hydrogen from the material exhausted from the plasma container, is coupled to the outlet, and comprises a hydrogen selective membrane and an oxygen selective membrane. The radioactive gas decays by beta decay, and comprises krypton-85. The generator comprises a fuel cell (110). A pressure in the plasma container is 20 Torr. The mixture management system is operable to control the pressure in the plasma container and to control the relative amounts of water vapor and radioactive gas in the plasma container. An INDEPENDENT CLAIM is included for a method of generating electric power.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of an electricity generation apparatus.    Fuel cell (110)    Plasma (115)    Outlet (140)    Inlet (150)    Separator. (160)