Calculating gamma-ray signatures from aged mixtures of heavy nuclides

We have created and distributed an open-source software package, RadSrc, that calculates the intrinsic gamma- ray spectrum from the nuclear decay of a mixture of radioisotopes. It implements the Bateman solution of the standard equations of radioactive-series growth and decay to determine isotope concentrations at a user selectable age and processes a database of decay energy lines to generate gamma-ray intensities from all decay chains. We provide an interactive program for studying complete spectra, a function library (callable from C, C++, and Fortran), and interfaces to popular Monte Carlo transport codes (MCNP, MCNPX, COG, and Geant4) so that the gamma rays can be sampled and tracked directly by the parent code. The RadSrc Suite can be downloaded from http://nuclear.llnl.gov/simulation.