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随着辐照加工技术的迅速发展,我国已经和正在建设一批大型辐照中心。与此同时,许多六十至七十年代建造的小型钴源室,为发挥更大的作用,正面临着改造和扩建的任务。本文介绍我校农用小钴室扩建工程中防护屏蔽层的计算,以及施工后的剂量测量结果。一、钴室防护屏蔽的计算原有小型农用钴源为1974年设计建造,扩建前源活度为2.0×10~(14)Bq。钴室系混凝土结构的圆形平顶建筑。墙厚1.40m,顶厚1.00m,源室直径4.50m,室内净高3.50m。贮源水井深4.00m,观察窗为单层铅玻璃。
With the rapid development of irradiation processing technology, China has and is building a number of large-scale irradiation center. In the meantime, many smaller cobalt-source rooms built in the 1960s and the 1970s are facing a task of transformation and expansion in order to play a greater role. This article describes the calculation of the protective shield in the expansion project of agricultural small cobalt chamber in our school and the dose measurement result after construction. First, the calculation of cobalt chamber shielding The original small-scale agricultural cobalt source designed and built in 1974, extension of the source activity before the 2.0 × 10 ~ (14) Bq. Cobalt chamber concrete structure of circular flat roof construction. Wall thickness 1.40m, top thickness 1.00m, the source chamber diameter 4.50m, indoor height 3.50m. Reservoir depth of water 4.00m, the observation window is a single layer of lead glass.