A self-contained source of gamma-ray and neutron radiation suitable for use as a radiation surrogate for weapons-grade plutonium is described. The source generates a radiation spectrum similar to that of weapons-grade plutonium at 5% energy resolution between 59 and 2614 keV, but contains no special nuclear material and emits little .alpha.-particle radiation. The weapons-grade plutonium radiation surrogate also emits neutrons having fluxes commensurate with the gamma-radiation intensities employed.
STATEMENT OF FEDERAL RIGHTS
The United States Government has rights in this invention pursuant to Contract No. W-7405-ENG-48, between the United States Department of Energy and the University of California for the operation of the Lawrence Livermore National Laboratory.