成都剂量体模(CDP)组织等效材料辐射等效性评价

Evaluation of irradiation equivalence of tissue-equivalent materials in chengdu dosimetric phantom(CDP)

在分析“成都剂量体模”(Chengdu Dosimetric Phantom,CDP)中常用辐射组织等效材料(肌肉脂肪组织混合等效材料、组织等效材料、躯干骨组织等效材料、脑组织等效材料和肺组织等效材料)的基本元素组成及其密度的基础上,对其质量衰减系数、有效原子序数、线性衰减系数和电子密度等参数进行测试和计算,并与人体的标准参数值进行比较。证明“成都剂量体模”的主要辐射组织等效材料能量响应范围宽,辐射等效性达到国际推荐标准A级,可作为检测标准广泛应用于各种放射诊断治疗设备和辐射防护仪器的标定。

Chengdu Dosimetric Phantom （CDP） used a lot of irradiation tissue-equivalent materials i.e.muscle-fat mixed tissue-equivalent material,bene tissue-equivalent material,brain tissue-equivalent material and lung tissue-equivalent material.By of analysis of basic element contents and densities of these materials,the authors measured and computed the mass attenuation coefficient,effective atomic number,liner attenuation coefficient and electron density.Then eompared these figures with standard figures of human.The results demonstratd that the main irradiation tissue-equivalent materials in ＂Chengdu Dosimetric Phantom＂ owned the broad energy seope and it reached A grade of the international recommended standards.As a result,these materials eould be used to demarcate the various irradiation diagnostie and therapy faeilities and radiation protection facilities.