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Title: Shielding the LANSCE (Los Alamos Neutron Scattering Center) 800-MeV spallation neutron source

Abstract

Neutrons produced by medium-energy (800-MeV) proton reactions at the Los Alamos Neutron Scattering Center spallation neutron source cause a variety of difficult shield problems. We describe the general shielding questions encountered at such a spallation source, and contrast spallation and reactor source shielding issues using an infinite slab-shield composed of 100 cm of iron and 15 cm of borated polyethylene. The calculations show that (for an incident spallation spectrum characteristic of neutrons leaking at 90 degrees from a tungsten target) high-energy neutrons dominate the dose at the shield surface. Secondary low-energy neutrons (produced by high-energy neutron attenuation) and attendant gamma-rays add significantly to the dose. The primary low-energy neutrons produced directly at the tungsten source contribute negligibly to the dose, and behave similarly to neutrons with a fission spectrum distribution. 8 refs., 10 figs.

Authors:
; ; ;
Publication Date:
Research Org.:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
OSTI Identifier:
6906835
Report Number(s):
LA-UR-88-1987; CONF-880906-6
ON: DE88014437
DOE Contract Number:  
W-7405-ENG-36
Resource Type:
Conference
Resource Relation:
Conference: 7. international conference on radiation shielding, Bournemouth, UK, 12 Sep 1988; Other Information: Paper copy only, copy does not permit microfiche production
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; NEUTRON SOURCES; SHIELDING; ENERGY DEPENDENCE; GAMMA RADIATION; NEUTRON FLUX; NEUTRON LEAKAGE; SHIELDING MATERIALS; ELECTROMAGNETIC RADIATION; IONIZING RADIATIONS; MATERIALS; PARTICLE SOURCES; RADIATION FLUX; RADIATION SOURCES; RADIATIONS; 654001* - Radiation & Shielding Physics- Radiation Physics, Shielding Calculations & Experiments

Citation Formats

Russell, G J, Legate, G L, Robinson, H, and Woods, R. Shielding the LANSCE (Los Alamos Neutron Scattering Center) 800-MeV spallation neutron source. United States: N. p., 1988. Web.
Russell, G J, Legate, G L, Robinson, H, & Woods, R. Shielding the LANSCE (Los Alamos Neutron Scattering Center) 800-MeV spallation neutron source. United States.
Russell, G J, Legate, G L, Robinson, H, and Woods, R. 1988. "Shielding the LANSCE (Los Alamos Neutron Scattering Center) 800-MeV spallation neutron source". United States. https://www.osti.gov/servlets/purl/6906835.
@article{osti_6906835,
title = {Shielding the LANSCE (Los Alamos Neutron Scattering Center) 800-MeV spallation neutron source},
author = {Russell, G J and Legate, G L and Robinson, H and Woods, R},
abstractNote = {Neutrons produced by medium-energy (800-MeV) proton reactions at the Los Alamos Neutron Scattering Center spallation neutron source cause a variety of difficult shield problems. We describe the general shielding questions encountered at such a spallation source, and contrast spallation and reactor source shielding issues using an infinite slab-shield composed of 100 cm of iron and 15 cm of borated polyethylene. The calculations show that (for an incident spallation spectrum characteristic of neutrons leaking at 90 degrees from a tungsten target) high-energy neutrons dominate the dose at the shield surface. Secondary low-energy neutrons (produced by high-energy neutron attenuation) and attendant gamma-rays add significantly to the dose. The primary low-energy neutrons produced directly at the tungsten source contribute negligibly to the dose, and behave similarly to neutrons with a fission spectrum distribution. 8 refs., 10 figs.},
doi = {},
url = {https://www.osti.gov/biblio/6906835}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Jan 01 00:00:00 EST 1988},
month = {Fri Jan 01 00:00:00 EST 1988}
}

Conference:
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