^(60)Co治疗机辐射场分布的研究  

Research on Radiation Field Dosage Distribution of ^(60)Co Treatment Room

作　　者：许潇[1] 哈日巴拉[1] 格日勒满达呼 王海玲[1] 王成国[1] 

机构地区：[1]内蒙古自治区疾病预防控制中心,内蒙古呼和浩特010031

出　　处：《中国辐射卫生》2015年第5期491-493,共3页Chinese Journal of Radiological Health

基　　金：卫生行业科技专项(201002009)

摘　　要：目的研究^(60)Co治疗机房内辐射场分布,为辐射屏蔽防护设计和放疗设备的性能质量控制提供基础数据,建立估算方法。方法采用热释光TLD对^(60)Co治疗机工作状态下,场所内的辐射剂量空间分布进行研究。结果在同一高度平面,2π范围内,距中心轴等距处的剂量分布呈一致趋势,最大偏差3.9%。在同一高度平面,各角度上的剂量随与中心轴距离增大而呈幂指数衰减。不同高度平面上,地面的剂量最高,机房顶层3 m以上空间剂量分布趋于均匀。结论采用的TLD剂量计测定^(60)Co治疗室内辐射场分布是有效可行的,通过实验数据得到的辐射场剂量分布曲线可用于辐射防护屏蔽设计。Objective To provide the basic data for design of radiation shielding and quality control of radiation treatment equipment,establish the estimation method for γ-radiation field and investigate,the radiation field dosage distribution of ^(60)Co treatment room has been investigated,where there is a ^(60)Co Tele-therapy equipment with photon flux.Methods The dose distribution of γ-radiation field has been measured using thermoluminescence dosimetry under ^(60)Co equipment normal operation condition.Results At the same height plane,each of dose distribution with 2πrange at the identical distance from central axis is consistent with relative standard deviation of measured values and average values being less than 3.9%,the dose values at different direction go down exponentially with increasing distance from central axis.At the different height plane,the doses on the ground are highest,and the dose values are uniformly distributed at the space 3 m above the ground.Conclusion It is feasible and effective that the dosage distribution of medicine ^(60)Co Tele-therapy equipment can be measured using thermoluminescence dosimetry method.The function for the description of radiometric quantity derivate by the experimental data can be used for design of radiation protection.

关 键 词：热释光探测器 剂量分布 60Co辐射场 

分 类 号：R144[医药卫生—公共卫生与预防医学]