The aim of present work is to examine the radiation interaction properties of muscle, cortical bone, lungs and their tissue equivalent materials in variety of radiation based dosimetric applications. The radiation interaction parameters like photon fluence rate, energy fluence rate, kerma, relative kerma, effective atomic number (Z_eff) and computed tomography (CT) number for tissues and their various equivalent materials for energies 60-, 81-, 122-, 184-, 356-,511-, 662-, 834- and 1120-keV respectively are investigated. Effective atomic numbers (Z_eff) of tissue equivalent materials have been assigned using anon-destructive experimental technique of multiple back-scattering of 662 keV photons. The gamma radiation flux of 662 keV photons is detected by 3″x 3″ NaI(Tl) scintillation detector. The numbers of multiply backscattered events, for all the tissue equivalent materials (TEM), are found to be increasing with thickness of TEM and finally saturates. The saturation thickness helps in assigning a precise value of effective atomic number Z_eff for tissue equivalent materials. Monte Carlo simulations support the results of present experiments. Kerma and relative kerma for tissue equivalent materials are evaluated for various gamma photon energies available from standard radioisotope sources. CT number of these tissues and their equivalent materials are evaluated for the first time for which no data are available for comparison with present results.

目前工作的目的是检查肌肉、皮质骨、肺及其组织等效材料在各种基于辐射的剂量测定应用中的辐射相互作用特性。辐射相互作用参数，如光子注量率、能量注量率、比释动能、相对比动能、组织的有效原子序数 (Z _eff ) 和计算机断层扫描 (CT) 数，以及能量 60-、81-、122- 的各种等效材料，分别研究了 184-、356-、511-、662-、834- 和 1120-keV。有效原子序数 (Z _eff) 的组织等效材料已使用 662 keV 光子的多次反向散射的非破坏性实验技术指定。662 keV 光子的伽马辐射通量由 3″x 3″ NaI(Tl) 闪烁探测器探测到。发现所有组织等效材料 (TEM) 的多重反向散射事件的数量随着 TEM 的厚度而增加并最终饱和。饱和厚度有助于指定有效原子序数 Z _eff的精确值用于组织等效材料。蒙特卡罗模拟支持当前实验的结果。对可从标准放射性同位素源获得的各种伽马光子能量，评估组织等效材料的比释动能和相对比动能。首次评估这些组织及其等效材料的 CT 值，没有数据可用于与目前的结果进行比较。