辐照装置源棒排列与参考面不均匀度的关系 - 核农学报.PDF

( ) 核 农 学 报 　2007 ,21 4 :387～389 387 　 J ournal of N uclear Agricultural Sciences ( ) 文章编号 2007 0438703 辐照装置源棒排列与参考面不均匀度的关系 1 2 2 2 雷 　鹏 　祝清俊 　邓 　鹏 　孙永堂 ( 1. 鲁东大学计算机科学与技术学院 , 山东 烟台　264025 ; 2 . 山东省农业科学院原子能农业应用研究所 , 山东 济南 　250100) 摘 　要 :本文研究了依据参考面不均匀度最小的约束条件排列源棒的方法 。根据照射率与空间距离变化 规律和单板源架的具体物理尺寸 ,将源棒依活度大小非递增排序 ,采用贪心算法设计技术 ,依据使参考 面上最小照射率取最大值和最大照射率值取最小的原则 ,依次将源棒排列完毕 。计算表明 ,此方法降低 了参考面的不均匀度 ,提高了照射场的均匀性 。 关键词 :辐照装置 ;照射率 ;排列 ;不均匀度 RELATION OF SOURCE PENCIL ARRANGEMENT AND UNUNIFORMITY OF STANDARD PLANE AT IRRADIATION FACILITY 1 2 2 2 L EI Peng 　ZHU Qingj un 　DEN G Peng 　SUN Yongtang ( 1. School of Comp uter Sci . and Tech . ,L uDong University , Yantai , Shandong 　264025 ; 2 . Institute f or Application of A tomic Energy , Shandong Academy of Agricultural Sciences ,J inan , Shandong 　250100) Abstract :A new method for arraying source bar based on the constraint of minimizing the ununiformity on the standard plane is presented. All source pencil are sorted by their activities in decreasing order . The changing rule of irradiation rate to the spacial distance and the size of framework laying bars were analyzed . The irradiation capacity on the standard plane by minimizing the maximum of irradiation rate and maximizing the minimum of irradiation rate were balanced at each step , which is based on the greedy algorithm. Experiments showed that this method could decrease the ununiformi