摘要
辐射防护是核技术应用的一个重要方面。本文以γ射线密度计为例,介绍了MonteCarlo方法在辐射防护设计中的应用。我们根据实际系统建立模型,在此基础上模拟了1600型挖泥船γ射线密度测量系统周围环境的泄漏辐射剂量场,为系统的防护设计提供理论指导。研究结果表明,在正常工作状态下,1600型γ射线密度测量系统的安全性达到了国家标准的要求。在管道吸空时辐射泄漏较严重,最严重的地方位于以探测器为中心、半径小于5cm的小块区域内。在此区域外泄漏的辐射急剧减少,25cm远处下降到国家标准规定的允许上限值。进一步的研究表明,在探测器后面增加一块半径为25cm、厚度为7cm的钢板将提供安全的辐射防护。
As an example, we have calculated the radiation dose distribution near by a γ-ray density meter equipped in a 1600 type dredge ship, using Geant 4 （Monte Carlo simulation software）. The most serious radiation leakage is found in the region close to the detector and it＇s safe for using the γ-ray density meter under normal working condition. But under some abnormal condition such as the empty pipe, the density meter will detect a huge amount of radiation. For providing a safe circumstance, additional shield should be adopted, In fact a piece of steel plate of φ50 cm× 7 cm in thickness could prevent most of escaping radiation and ensure the safety.
出处
《核技术》
EI
CAS
CSCD
北大核心
2006年第3期178-181,共4页
Nuclear Techniques
