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作 者 ：陈志军, 戚文元, 颜伟强, 岳玲, 王海宏, 包英姿, 袁忠谊, 徐贇, 孔秋莲

期 刊 ：核农学报 2016年 30卷 4期 页码：755-763

关键词：电子加速器；辐照工艺；深度剂量分布；剂量不均匀度；

Keywords:electron accelerator, irradiation technology, depth-dose distribution, dose uniformity,

摘 要 ：为简化辐照工艺制定方法,以10MeV电子直线加速器为研究对象,利用铝片叠层法测定电子束单双面辐照时铝片中的剂量分布情况,并以此为基础推算、建立并验证不同密度产品10MeV电子束单双面辐照的深度剂量分布曲线,得出10MeV电子束辐照时各射程深度与材料密度的关系公式。根据深度剂量分布曲线,明确了双面辐照时均一密度产品在不同辐照深度情况下对应的剂量不均匀度(U)。以U ≤2.5为标准,将产品按不同厚度分类,建立相应的辐照加工工艺,且实际生产应用效果良好。本研究对10 MeV电子直线加速器辐射加工工艺制定具有一定的指导意义。

Abstract:The goal of this study was to develop an easy and effective method to simplify processing procedures using 10MeV linear accelerator irradiation. Depth-dose distributions were experimentally measured using aluminum sheets which were irradiated by 10MeV linear accelerator in one-sided and two-sided way, respectively. Depth-dose distribution curves for one-side and two-side irradiated products of different densities were established based on the data of irradiated aluminum sheets. The simple computational formulas of density and irradiation range parameters ( R_opt,R_50e,R_p) were established too. Dose uniformities of two-side irradiated products at different depth were calculated according to the related curves. Products were classified into different groups of depth according to the dose uniformity (U ≤2.5), and appropriate processing techniques were established for real samples to ensure the effectiveness of the irradiation. This study should be helpful for proper use of 10 MeV electron beam irradiation in food.

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