Shielding research of minitype reference radiation device based on Monte Carlo simulation
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摘要: 针对移动式小尺度参考辐射（MRR）装置（移动式校准装置），在进行射线辐射剂量测量的仪器仪表标定或刻度时，应满足其辐射屏蔽安全限值5 Sv/h的屏蔽技术要求，采用蒙特卡罗输运程序MCNP，开展了移动式小尺度参考辐射装置表面剂量场屏蔽的模拟计算和研究分析工作。研究结果表明，通过MCNP模拟的屏蔽设计方法可以详尽反映MRR装置各个表面的剂量分布特征和规律，实现移动式小尺度参考辐射装置屏蔽设计，采用的铅钢材料复合屏蔽方案能够保证装置硬度且显著地减轻屏蔽体的重量，最终获取的优化MRR屏蔽箱体重量约为271.9 kg。Abstract: When applied the minitype reference radiation (MRR) to calibrate gamma ray dosimeters, the shielding structure of the MRR should meet the shielding technique demand, in which the limit dose rate of the outside surface of the MRR must be lower than 5 Sv/h. In order to optimize the shielding design of the MRR, Monte Carlo particle transport code MCNP is employed to simulate and analyze the dose distribution of the outside surface of the MRR. The results show that the dose distribution of each surface of the MRR can be described in detail with MCNP and it is conducive to complete shielding design. The lead-steel composite material is applied to increase the strength and reduce the weight of the MRR. The optimized weight of the MRR is about 271.9 kg.
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Key words:
- mobile calibration device /
- reference radiation /
- Monte Carlo code /
- shielding design
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