Neutron-charged-particle reactions in CR-39 calculated using MCNP and LAHET

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A problem in using Bonner spheres for the spectroscopy of neutron of energy greater than 20 MeV is that the response functions for differing polyethylene thicknesses become similar in shape, making the spectral unfolding quite difficult. The possibility that use of a neutron detector such as CR-39 that is sensitive to high-energy neutrons combined with a lead radiator that has a significant variation of cross section due to the Pb(n,xn) reaction above 20 MeV, led to the theoretical investigation of the response of a CR-39 detector with lead in front of it. The authors have calculated the response of CR-39 ... continued below

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9 p.

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Hsu, H.H. & Devine, R.T. December 31, 1996.

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A problem in using Bonner spheres for the spectroscopy of neutron of energy greater than 20 MeV is that the response functions for differing polyethylene thicknesses become similar in shape, making the spectral unfolding quite difficult. The possibility that use of a neutron detector such as CR-39 that is sensitive to high-energy neutrons combined with a lead radiator that has a significant variation of cross section due to the Pb(n,xn) reaction above 20 MeV, led to the theoretical investigation of the response of a CR-39 detector with lead in front of it. The authors have calculated the response of CR-39 (polyallyl-diglycol carbonate) in terms of charged particles produced per-unit-incident neutron for a foil of 2-cm diameter and 0.15-cm thick. They also calculated another set, using cylindrical slugs of lead of 2-cm diameter and 1-cm and 2-cm thick, with the foil positioned on the end of the slug so that the neutron beam had to pass through the lead. MCNP was used to calculate the responses in all three cases for energies from 0.1 MeV to 20 MeV. LEHET was applied to calculations from 0.1 MeV to 1,000 MeV. The MCNP calculation yields H(n,p), C(n,{alpha}), and O(n,{alpha}) reactions; the LAHET computation produces the sum of proton recoil and deuteron, triton, and alpha-particle production. The LAHET calculation indicates that the enhanced response due to Pb(n,xn) production may prove useful in neutron spectroscopy.

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9 p.

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INIS; OSTI as DE97000370

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  • 30. midyear topical meeting of the Health Physics Society, San Jose, CA (United States), 5-8 Jan 1997

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  • Other: DE97000370
  • Report No.: LA-UR--96-3452
  • Report No.: CONF-970134--11
  • Grant Number: W-7405-ENG-36
  • DOI: 10.2172/425343 | External Link
  • Office of Scientific & Technical Information Report Number: 425343
  • Archival Resource Key: ark:/67531/metadc683093

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  • December 31, 1996

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  • July 25, 2015, 2:20 a.m.

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  • May 20, 2016, 1:35 p.m.

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Hsu, H.H. & Devine, R.T. Neutron-charged-particle reactions in CR-39 calculated using MCNP and LAHET, report, December 31, 1996; New Mexico. (digital.library.unt.edu/ark:/67531/metadc683093/: accessed November 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.