摘要
首先,建立了与各向同性γ点源积累因子理论条件等效的MCNP平板模型并进行了计算,计算结果与文献值吻合较好;然后,提出替代平板模型的球壳模型,使计算效率得到了明显提高,尤其是在材料较厚时的优势更为明显;最后,利用球壳模型计算了不同能量的γ射线在铅和铁中的积累因子,重点考查了轫致辐射对积累因子的影响,结果表明:采用球壳模型可以快速准确地计算厚度较大的各种材料中的积累因子。该计算方法为积累因子数据的补充和更新提供了借鉴和参考,也可用于高效计算各种材料的减弱系数等参数。
At first,MCNP slab model is established,which is equivalent to theoretical condition on buildup factor calculating of isotropic gamma point source.The calculated results are close to that of relative literatures.And then sphere-shell model is proposed,which improves calculation efficiency remarkably,especially in the situation of thicker materials.In the end,buildup factors of various energy gamma rays in lead and iron are calculated by using the sphere-shell model,and the influence of bremsstrahlung on buildup factor is investigated.Calculation results show that the sphere-shell model can be used to calculate buildup factors in rather thicker materials rapidly and precisely.The sphere-shell model can provide a reference for supplement and update of buildup factors and can also be utilized to calculate attenuation coefficients of different materials.
作者
龚军军
张磊
郑昌焘
GONG Jun-jun;ZHANG Lei;ZHENG Chang-tao(College of Nuclear Science and Technology,Naval Univ.of Engineering,Wuhan 430033,China;Unit No.92730,Sanya 572000,China)
出处
《海军工程大学学报》
CAS
北大核心
2018年第5期86-91,共6页
Journal of Naval University of Engineering
关键词
各向同性γ点源
积累因子
平板模型
球壳模型
isotropic gamma point source
buildup factor
slab model
sphere-shell model
