The present disclosure is directed to nuclear thermionic avalanche cell (NTAC) systems and related methods of generating energy from captured high energy photons. Huge numbers of electrons in the intra-band of atom can be liberated through bound-to-free transition when coupled with high energy photons. If a power conversion process effectively utilizes these liberated electrons in an avalanche form through a power conversion circuit, the power output will be drastically increased. The power density of a system can be multiplied by the rate of high energy photon absorption. The present disclosure describes a system and methods built with multilayers of nuclear thermionic avalanche cells for the generation of energy. The multilayer structure of NTAC devices offers effective recoverable means to capture and harness the energy of gamma photons for useful purposes such as power systems for deep space exploration.

A chargeable atomic battery (CAB), such as a fully ceramic encapsulated radioactive heat source, includes a plurality of CAB units and a CAB housing to hold the plurality of CAB units. Each of the CAB units are formed of a precursor compact including precursor material particles embedded inside an encapsulation material. The precursor material particles include a precursor kernel formed of a precursor material that is initially manufactured in a stable state or an unstable state and convertible into an activated material that is an activated state via irradiation by a particle radiation source. The precursor material particles can include one or more encapsulation coatings surrounding the precursor kernel. The precursor material can include Neptunium-237 and the activated material can include Plutonium-238. A radioisotope thermoelectric generator can include thermoelectrics coupled to the CAB units to convert radioactive emissions of the activated material into electrical power.

A thermoelectric cooler including a thermoelectric junction and a radiation source. The thermoelectric cooler includes n-type material, p-type material, and an electrical power source. The radiation source emits ionizing radiation that increases electrical conductivity of the n and p type materials. Also detailed is a method of using radiation to reach high coefficient of performance (COP) values with a thermoelectric cooler that includes providing a thermoelectric cooler and a radiation source, with the thermoelectric cooler including an n-type material, p-type material, an electrical power source, and emitting ionizing radiation with the radiation source to increase the electrical conductivity which strips electrons from the n-type material, the p-type material, or both the n-type material and p-type material from their nuclei with the electrons then free to move within the material.

A cooling system and method for Nuclear Thermionic Avalanche Cells (NT A Cs) Through cooling channels disposed within layers of the NTAC. The NTAC uses gamma ray radiations and/or energetic electrons which are emanated from the decay processes of radioactive materials 5 and operates continuously. The cooling system and method maximizes energy output of current NTAC devices, alleviates thermal loading issues inside a NTAC. The cooling system and method may also include radiative means for dissipating thermal energy, or in other embodiments capture thermal energy from a NTAC in addition to electrical energy generated by NTACs. Cooling channels are disposed within the layers of a NTAC and joined to a fluid and/or gas flow control system through top and bottom structures which incorporate cooling channels and allow fluid and/or gas to flow through the layers of a NT AC. Flow control systems may operate the cooling system and method through one or more isolated cooling system loops, and may include sensors, valves, and other flow control means to optimize operation and utilization of the cooling system and method, as well as capture of thermal energy from a NTAC.

A thermionic energy conversion system, preferably including one or more electron collectors, interfacial layers, encapsulation, and/or electron emitters. A method for manufacturing the thermionic energy conversion system. A method of operation for a thermionic energy conversion system, preferably including receiving power, emitting electrons, and receiving the emitted electrons, and optionally including convectively transferring heat.

A method for generating electricity includes generating electricity at a first reactor with a nuclear fuel element and removing the nuclear fuel element from the first reactor. The method also includes providing the nuclear fuel element at a second reactor and generating electricity at the second reactor with the nuclear fuel element.

A power generation device may include a radiation source, an emitter, and a collector. The emitter may be formed adjacent to the radiation source. The emitter may include a high-density material. The collector may be adjacent to the radiation source and include a low-density material. The emitter is between the radiation source and the collector. An insulator may be positioned between the emitter and the collector. An emitter of a nuclear battery and a method of forming an emitter of a nuclear battery are also disclosed.

A thermionic energy conversion system, preferably including one or more electron collectors, interfacial layers, encapsulation, and/or electron emitters. A method for manufacturing the thermionic energy conversion system. A method of operation for a thermionic energy conversion system, preferably including receiving power, emitting electrons, and receiving the emitted electrons, and optionally including convectively transferring heat.

A method for generating electricity includes generating electricity at a first reactor with a nuclear fuel element and removing the nuclear fuel element from the first reactor. The method also includes providing the nuclear fuel element at a second reactor and generating electricity at the second reactor with the nuclear fuel element.

A thermoelectric cooler including a thermoelectric junction and a radiation source. The thermoelectric cooler includes n-type material, p-type material, and an electrical power source. The radiation source emits ionizing radiation that increases electrical conductivity of the n and p type materials. Also detailed is a method of using radiation to reach high coefficient of performance (COP) values with a thermoelectric cooler that includes providing a thermoelectric cooler and a radiation source, with the thermoelectric cooler including an n-type material, p-type material, an electrical power source, and emitting ionizing radiation with the radiation source to increase the electrical conductivity which strips electrons from the n-type material, the p-type material, or both the n-type material and p-type material from their nuclei with the electrons then free to move within the material.