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Radiation shielding for neutron guides

机译：中子导管的辐射屏蔽

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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 120mm 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 (c) 2006 Published by Elsevier B.V. All rights reserved.
机译：使用蒙特卡罗代码MCNP 4B构造了OPAL反应堆（ANSTO）的热中子束线和冷中子束线上的掩体导管外的中子导管屏蔽模型。注意到，未在导管内部反射但被超镜（SM）层吸收的中子是伽马的重要来源。伽玛也来自玻璃中所含的B，Si，Na和K吸收的中子。提出的屏蔽设计产生了紧凑的屏蔽组件。这些安排符合安全要求，地面负荷限制和成本限制。为了验证设计，组装了一个原型，该原型由120mm厚的Pb（96％）Sb（4％）壁组成，搁在混凝土块上。在实验测量值与计算的大剂量屏蔽区剂量率之间有很好的一致性。官方版权（c）2006，Elsevier B.V.保留所有权利。

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