Patent Number: 
Section: claims

1. A power source, comprising:an enclosure;a substrate disposed within the enclosure;radioactive material disposed within the substrate and adapted to emit radioactive particles;a diffusion barrier disposed over an outer surface of the substrate; anda carrier material disposed within the enclosure, wherein the carrier material comprises an oxide material. 2. The power source of claim 1, wherein the enclosure comprises a housing and a cover connected to the housing. 3. The power source of claim 2, wherein the housing comprises a reflective material and the cover comprises a transparent material. 4. The power source of claim 2, further comprising a reflective layer disposed on an inner surface of the housing. 5. The power source of claim 2, wherein at least one of the housing and the cover comprises a glass material. 6. The power source of claim 1, wherein the radioactive material comprises tritium. 7. The power source of claim 1, further comprising a converter disposed either adjacent the enclosure or within the enclosure. 8. A method of forming a power source, comprising:forming a diffusion barrier on a substrate;disposing radioactive material within the substrate;disposing the substrate within a housing;disposing a carrier material within the housing, wherein the carrier material comprises an oxide material;sealing the housing with a cover connected to the housing to form an enclosure; andheating the substrate such that the radioactive material diffuses from the substrate and reacts with the carrier material. 9. The method of claim 8, wherein disposing radioactive material within the substrate comprises:exposing the substrate to a gas phase of the radioactive material; andheating the substrate such that at least a portion of the gas phase radioactive material is absorbed by the substrate. 10. The method of claim 9, wherein disposing the radioactive material within the substrate further comprises increasing a pressure of the gas phase radioactive material such that the pressure is at least 10 mBar and no greater than 10 Bar. 11. The method of claim 8, further comprising reducing a pressure within the enclosure prior to heating the substrate. 12. The method of claim 8, further comprising disposing particle converting material within the housing such that radioactive particles emitted by the radioactive material are incident upon the particle converting material, wherein the particle converting material converts the incident radioactive particles into light. 13. The method of claim 12, further comprising:disposing a photovoltaic device adjacent the housing; andconverting light emitted by the particle converting material that is incident upon an input surface of the photovoltaic device into electrical energy. 14. The method of claim 8, further comprising disposing a charge carrier separator within the housing such that radioactive particles emitted by the radioactive material are incident upon the charge carrier separator, wherein the incident radioactive particles are converted to electrical energy. 15. The method of claim 14, wherein at least a portion of the enclosure is formed by the charge carrier separator.