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- W3699955 abstract "Neutrons produced by 800-MeV proton reactions at the Los Alamos Neutron Scattering Center spallation neutron source cause a variety of challenging shielding problems. We identify several characteristics distinctly different from reactor shielding and compute the dose attenuation through an infinite slab/shield composed of iron (100 cm) and borated polyethylene (15 cm). Our calculations show that (for an incident spallation spectrum characteristic of neutrons leaking from a tungsten target at 90/degree/) the dose through the shield is a complex mixture of neutrons and gamma rays. High-energy (> 20 MeV) neutron production from the target is approx. =5% of the total, yet causes approx. =68% of the dose at the shield surface. Primary low-energy (< 20 MeV) neutrons from the target contribute negligibly (approx. =0.5%) to the dose at the shield surface yet cause gamma rays, which contribute approx. =31% to the total dose at the shield surface. Low-energy neutrons from spallation reactions behave similarly to neutrons with a fission spectrum distribution. 6 refs., 8 figs., 1 tab." @default.
- W3699955 created "2016-06-24" @default.
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- W3699955 date "1989-01-01" @default.
- W3699955 modified "2023-09-27" @default.
- W3699955 title "Shielding concerns at a spallation source" @default.
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- W3699955 hasPublicationYear "1989" @default.
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