Radiation shielding for neutron guides
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Date
2006-11-15
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Publisher
Elsevier B. V.
Abstract
Models of the neutron guide shielding for the out of bunker guides on the thermal and cold neutron beam lines of the OPAL Reactor (ANSTO) were constructed using the Monte Carlo code MCNP 4B. The neutrons that were not reflected inside the guides but were absorbed by the supermirror (SM) layers were noted to be a significant source of gammas. Gammas also arise from neutrons absorbed by the B, Si, Na and K contained in the glass. The proposed shielding design has produced compact shielding assemblies. These arrangements are consistent with safety requirements, floor load limits, and cost constraints. To verify the design a prototype was assembled consisting of 120 mm thick Pb(96%)Sb(4%) walls resting on a concrete block. There was good agreement between experimental measurements and calculated dose rates for bulk shield regions. Crown Copyright © 2006 Published by Elsevier B.V.
Description
Physical copy held by ANSTO Library at DDC 539.7213/3. Part II
Keywords
ANSTO, Glass, Neutrons, Design, Dose rates, Monte Carlo Method, Neutron absorbers, Neutron guides, Neutron reflectors, Radiation protection, Reflective coatings, Safety standards, Shielding materials
Citation
Ersez, T., Braoudakis, G., & Osborn, J. C. (2006). Radiation shielding for neutron guides. Paper presented at the Eighth International Conference on Neutron Scattering (ICNS 2005), "Neutrons for structure and dynamics - a new era", Sydney, Australia, 27 November to 2 December 2005. In Campbell, S. J., Cadogan, J. M., Furusaka, M., Hauser, N., & James, M. (Eds), Physica B: Condensed Matter, 385-386(Part 2), 1268-1270. doi:10.1016/j.physb.2006.06.028