A set of alloy formulations is disclosed to use with thorium based nuclear fuels in a fast spectrum reactor; with thorium based nuclear fuels in existing thermal spectrum power reactors; for medical isotope production in the epithermal, the fast, the fission spectrum and the thermal spectra; and to use as fuel in test and experimental reactors that are non proliferative. The alloys form inert metal matrixes to hold fine particles of dispersed thorium containing fuel. The formulations also are useful for the production of medical and commercial isotopes in the high energy, fast and epithermal neutron spectra.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
 The United States Government has rights in the invention disclosed in the United States provisional patent applications, claimed as priority documents in the PCT Request, pursuant to Work for Others Agreement No. LB05-001446 between Charles S. Holden, the Regents of the University of California as the Management and Operating Contractor for the Ernest Orlando Lawrence Berkeley National Laboratory Operating and Prime Contract No. DE-AC03-76SF00098 for the U.S. Department of Energy.