壳源法放射性废物桶作为SGS装置校准源的可行性

摘要

Due to the difficulty in preparation of homogeneous radioactive waste drum with large volume , the detection efficiency of segmented γ scanning (SGS ) device is scaled usually with indirect approaches .Shell source method is one of best ways ,which uses linear source as the principal part .It is not so complicated for the preparation ,and the structure is flexible .Based on the comparison of measurement results from uniform drums and drums prepared with shell source method ,it is proved that they are equiva‐lent in the calibration of efficiency .The latter can be taken as the reference source of SGS device .%由于均匀的大体积放射性废物桶制备困难，放射性废物桶分段γ扫描（SGS ）装置的活度探测效率多采用间接的方式进行刻度。壳源法制备的废物桶以线状源为核心，制备简单，结构灵活，是最佳的间接方法之一。本文通过对均匀填充型放射性水溶液桶和壳源法制备的放射性废物桶测量比较，证明壳源法制备的放射性废物桶在进行SGS装置探测效率刻度时与均匀桶是等效的，可作为此类装置探测效率的校准源。