B. A. Clothier, M. C. Nielsen, T. R. Tolliver, and A. L. Garner, "Radioisotope Power Source," U.S. Patent No. 8,294,023 (issued 23 October 2012). 

The patent is for radioisotope power sources that include radioisotope nanoparticles and scintillator materials. A system that employs the radioisotope power source and a method of generating an electrical current are also disclosed.