SCALE Software Coordinator
This topic has been migrated from the SCALE 5 ORIGEN notebook.
Date: Fri Mar 14 13:39:10 2008
Several updates were made to the ORIGEN card-image decay library,
origen.rev03.end6dec.data, to make the half-lives for several activation products consistent with more up-to-date ENSDF values for isotopes that also occur as fission products. The changes, restricted to activation products only, were included in origen.rev04.end6dec.data, which was released in SCALE 5.1. The data changes are listed in the table below.
The binary ORIGEN library, pwr33gwd, was inadvertently not remade after the last update to the decay library, and the version origen.rev02.pwr33gwd distributed in SCALE 5.1 contains the older data and is identical to the library distributed in SCALE 5.0. In some cases, users who have performed decay calculations for activation products have found differences in the activities calculated using the different libraries, resulting from differences in the decay constants.
Windows users can download and install the updated origen.rev03.pwr33gwd file. Unix/Linux users can update the library by performing the following steps.
1. Edit the scale5.1/work/origen_xslibs.input file and change the revision number from "rev02" to "rev03" in the data library name near the end of the input file.
2. Execute the updated origen_xslibs.input file using the following command.
env FORT_CONVERT15=BIG_ENDIAN batch5 origen_xslibs &
Activation Product Half-Life
Nuclide Decay Mode Rev. 03 Rev. 04 Difference (%)
Se-79 Beta 1.041E+13 s 2.947E+05 y 11.94
Rh-102 Beta 9.152E+07 s 2.072E+02 d 411.23
Ru-106 Beta 3.211E+07 s 1.017E+00 y 0.05
Ag-106 EC 1.440E+03 s 2.396E+01 m 0.16
Ba-131 EC 1.020E+06 s 1.150E+01 d 2.66
Ce-142 Stable 3.311E+18 s 0.000E+00 y -
Sm-149 Stable 3.154E+23 s 0.000E+00 y -
Gd-155m IT 3.100E-02 s 3.197E-02 s 3.03
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