Comparison of (alpha, n) thick-target neutron yields and spectra from ORINGEN-S and SOURCES

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Both ORIGEN-S and SOURCES generate thick-target neutron yields and energy spectra from ({alpha},n) reactions in homogeneous materials. SOURCES calculates yield and spectra for any material containing {alpha}-emitting and ({alpha},n) target elements by simulating reaction physics, using {alpha}-emission energy spectra, elemental stopping cross sections, ({alpha},n) cross sections for target nuclei, and branching fractions to produce-nuclide energy levels. This methodology results in accurate yield and spectra. ORIGEN-S has two options for calculating yields and spectra. The UO{sub 2} option (default) estimates yields and spectra assuming the input {alpha}-emitters to be infinitely dilute in UO{sub 2}. The borosilicate-glass option estimates yields from the ... continued below

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8 p.

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Brown, T.H.; Wilson, W.B.; Perry, R.T. & Charlton, W.S. December 31, 1998.

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Both ORIGEN-S and SOURCES generate thick-target neutron yields and energy spectra from ({alpha},n) reactions in homogeneous materials. SOURCES calculates yield and spectra for any material containing {alpha}-emitting and ({alpha},n) target elements by simulating reaction physics, using {alpha}-emission energy spectra, elemental stopping cross sections, ({alpha},n) cross sections for target nuclei, and branching fractions to produce-nuclide energy levels. This methodology results in accurate yield and spectra. ORIGEN-S has two options for calculating yields and spectra. The UO{sub 2} option (default) estimates yields and spectra assuming the input {alpha}-emitters to be infinitely dilute in UO{sub 2}. The borosilicate-glass option estimates yields from the total input material composition and generates spectra purportedly representative of spectra generated by {sup 238}Pu, {sup 241}Am, {sup 242}Cm, and {sup 244}Cm infinitely dilute in borosilicate glass, even if none of these four {alpha}-emitters are present in the input material composition. Because yields from the borosilicate-glass option in ORIGEN-S are based on entire input material composition and are reasonably accurate, the same is often assumed to be true for spectra. The input/output functionality of the borosilicate-glass option, along with ambiguity in ORIGEN-S documentation, gives the incorrect impression that spectra representative of input compositions are generated. This impression is reinforced by wide usage of the SCALE code system and its ORIGEN-S module and their sponsorship by the US Nuclear Regulatory Commission.

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8 p.

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INIS; OSTI as DE99001845

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  • American Nuclear Society winter meeting, Washington, DC (United States), 15-19 Nov 1998

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  • Other: DE99001845
  • Report No.: LA-UR--98-3094
  • Report No.: CONF-981106--
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 314146
  • Archival Resource Key: ark:/67531/metadc680229

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  • December 31, 1998

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  • July 25, 2015, 2:20 a.m.

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  • May 20, 2016, 1:05 p.m.

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Brown, T.H.; Wilson, W.B.; Perry, R.T. & Charlton, W.S. Comparison of (alpha, n) thick-target neutron yields and spectra from ORINGEN-S and SOURCES, article, December 31, 1998; New Mexico. (digital.library.unt.edu/ark:/67531/metadc680229/: accessed May 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.