物理学报Issue(15)：1-9,9.DOI:10.7498/aps.63.152801
中国散裂中子源多功能反射谱仪屏蔽设计*
Shielding design of the multi-purp ose reflectometer of China spallation neutron source
摘要
Abstract
The shielding design employing the Monte Carlo simulation code of MCNPX 2.5.0 for multi-purpose reflectometer of China spallation neutron source (CSNS) is introduced, including the shielding needs, radiation source terms, calculating methods and simulation results, etc. Various radiation source terms such as the moderator leakage source term, and the neutron guide loss source term etc. are taken into account in the simulation, and step-by-step calculation method and variance reduction methods such as source angular biasing, source energy biasing, and geometry splitting, are adopted to improve the computing speed while the precision of the results is guaranteed. In the shielding design of instrument transport beamline, second shutter, and scattering room etc., the final shielding parameters are determined by comparing the shielding need under different operating conditions, to ensure the dose rate below the 2.5 µSv/h limitation in accessible locations outside the shielding.关键词
屏蔽设计/MCNPX/中国散裂中子源/多功能反射谱仪Key words
shielding design/MCNPX/CSNS/multi-purpose reflectometer引用本文复制引用
沈飞,梁泰然,殷雯,于全芝,左太森,姚泽恩,朱涛,梁天骄..中国散裂中子源多功能反射谱仪屏蔽设计*[J].物理学报,2014,(15):1-9,9.基金项目
国家自然科学基金(批准号:91026009,11174358,11075203)资助的课题 （批准号:91026009,11174358,11075203）
