TRIGA研究堆假想事故引起的134Cs和137Cs辐射浓度分布

Arif Jahan Sarawer, M. Hoq, M. A. Khae, Mahobul Islam, M. M. Rahman, M. T. Chowdhury, M. M. Rahman
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摘要

本文介绍了孟加拉国萨瓦尔AERE TRIGA Mark II研究堆假想事故引起的134Cs和137Cs放射性浓度的评估。134Cs和137Cs的浓度是通过摄入植物、牛奶和肉类等不同途径估算的。最高空气浓度已在距离反应堆堆芯65米处确定。事故发生后,最大浓度在各个方向上毫不拖延地消失了。分析了当地的平均风速和风频等气象信息。考虑到所有方向,在“S”方向观察到最高浓度。测定了土壤、植被、牛奶和肉类中134Cs和137Cs的浓度。137Cs的浓度被研究为高于134Cs。134Cs和137Cs在植被、牛奶和肉类中的浓度低于地面浓度。总的来说,在这项研究中,肉类中的浓度被调查为较低。在反应堆事故的情况下,由于摄入蔬菜、牛奶和肉类而进行的浓度评估将是确保孟加拉国萨瓦尔AERE研究反应堆辐射防护的宝贵指南。
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Radiological Concentration Distribution of 134Cs and 137Cs Due to a Hypothetical Accident of TRIGA Research Reactor
The assessment of the radiological concentration of 134Cs and 137Cs owing to hypothetical accident of TRIGA Mark-II research Reactor at AERE, Savar, Bangladesh is presented here in this work. The concentration of 134Cs and 137Cs was estimated in different pathways consisting of the ingestion of plants, milk, and meat. The highest air concentration has been determined at 65 m distance from the core of the reactor. The maximum concentration passed off without delay simply after the accident in various directions. Local meteorological information such as average wind velocity and wind frequency were analyzed. Considering all directions, the highest concentration has been observed in the “S” direction. The concentrations of 134Cs and 137Cs were determined in ground, vegetation, milk and meat. The concentration of 137Cs is investigated to be higher than the 134Cs. The concentration of 134Cs and 137Cs was found to be lower in vegetation, milk, and meat than that of ground concentration. Overall, in this study, the concentration in meat has been investigated to be lower. In case of a reactor accident, the concentration assessment due to the ingestion of vegetables, milk, and meat will be a valuable guide for insuring radiological protection across the research reactor at AERE, Savar, Bangladesh.
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