ORIGEN-S Decay Data Library and Half-Life Uncertainties
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The results of an extensive update of the decay data of the ORIGEN-S library are presented
in this report. The updated decay data were provided for both the ORIGEN-S and ORIGEN2
libraries in the same project. A complete edit of the decay data plus the available half-life
uncertainties are included in Appendix A. A detailed description of the types of data contained in the
library, the format of the library, and the data sources are also presented. Approximately 24% of the
library nuclides are stable, 66% were updated from ENDF/B-VI, about 8% were updated from
ENSDF, and the remaining 2% were not updated. Appendix B presents a listing of percentage
changes in decay heat from the old to the updated library for all nuclides containing a difference
exceeding 1% in any parameter.
