Shielding the LANSCE (Los Alamos Neutron Scattering Center) 800-MeV spallation neutron source
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.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 6906835
- Report Number(s):
- LA-UR-88-1987; CONF-880906-6; ON: DE88014437
- 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
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Related Subjects
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