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ORIGEN: Neutron activation, transmutation, fission product generation, & radiation source term calculation
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ORIGEN (Oak Ridge Isotope G\ eneration code) calculates time-dependent
concentrations, activities, and radiation source terms for a large
number of isotopes simultaneously generated or depleted by neutron
transmutation, fission, and radioactive decay. ORIGEN is used internally
within SCALE’s TRITON and Polaris sequences to perform depletion and
decay. As a stand-alone SCALE module, ORIGEN provides additional unique
capabilities to (1) simulate continuous nuclide feed and chemical
removal, which can be used to model reprocessing or liquid fuel systems,
and (2) generate alpha, beta, neutron and gamma decay emission spectra.
A standard decay library is provided to perform decay calculations. For
neutron activation and fuel depletion problems, neutron
spectrum-dependent ORIGEN libraries are required and may be created from
(1) user-defined spectrum and self-shielded cross sections using the
COUPLE module or (2) interpolation of existing ORIGEN reactor libraries
(precalculated by TRITON) using the Automated Rapid Processing (ARP)
module. Post-processing using the OPUS module allows calculated
isotopics and spectra to be sorted, ranked, and converted to other
units.

.. toctree::

  origen-front-matter
  origen-theory
  origen-module-intro
  ORIGEN <origen-module>
  ARP <arp-module>
  OPUS <opus-module>
  origen-examples


.. only:: html

  .. rubric:: References

.. bibliography:: ../zSCALE.bib
  :labelprefix: ORIGEN-
  :keyprefix: ORIGEN-


Appendices
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.. toctree::

  appendix/origen-utils
  COUPLE <couple-module>