The INL’s Gamma-ray Spectrum Catalogue is an attempt to compile spectra from various detector types and present these spectra with decay schemes and data tables based on the latest ENSDF data. It includes recently acquired Ge spectra and decay data as well as available spectra acquired for the original NaI(Tl) and Ge(Li) Catalogues. All information is documented by the spectra acquisition date and the ENSDF download date.

Progeny peaks are colored red or blue as are the parent radioactinide peaks. The radionuclide symbols of the progeny peaks are placed in parenthesis by the labeled peak and colored brown. The decay schemes and -ray energy and emission probability tables associated with the parent and progeny are given for each member of the decay chain.

Spectral content and shape is dependent on the "source age" when progeny grow-in is occurring at the time of spectral acquisition. "Source age" is defined as the calculated time since the parent activity could be considered free of any progeny or the actual (measured) time since the parent was chemically separated from all of its progeny. Whenever a meaningful "source age" can be measured or calculated, it is given in the legend. Spectra with different source ages and taken on different types and sizes of detectors are to be included in the Gamma-ray Spectrum Catalogue.

The spectral data from the original NaI(Tl) and Ge(Li) Catalogues have been incorporated for different uses and to allow comparisons of detector type, size, and source age.