辽宁省核查放射治疗参考与非参考条件下剂量学参数方法验证  

Verification of dose parameters under reference and non-reference conditions for radiotherapy in Liaoning province

作　　者：崔勇[1] 刘宝辰[1] 陈中兴[1] 郭军巧[1] 罗素明[2] 何志坚[2] 袁继龙[2] 

机构地区：[1]辽宁省疾病预防控制中心,沈阳110005 [2]中国疾病预防控制中心辐射防护与核安全医学所辐射防护与核应急中国疾病预防控制中心重点实验室

出　　处：《中华放射医学与防护杂志》2014年第6期456-460,共5页Chinese Journal of Radiological Medicine and Protection

基　　金：IAEA基金资助项目（11916/R0）;卫生行业科研专项（201002009）

摘　　要：目的 研究用热释光剂量计（TLD）方法核查放射治疗参考条件和非参考条件下剂量学参数的可靠性验证.方法 在参考条件和非参考条件下,用建立的TLD方法,核查5家医院10条6 MV光子线束剂量随深度、源皮距、照射野大小和45°楔形板等变化,5条9 MeV电子线束轴向最大剂量点处等剂量学参数,TLD测量结果与剂量仪测量结果进行对比.结果 6 MV光子线束TLD测量结果与指形电离室测量结果的平均相对偏差为4.45％,低于IAEA要求的≤±7％;9 MeV电子线束TLD测量结果与平行板电离室测量结果平均相对偏差为2.45％,低于IAEA要求的≤±5％.结论 用TLD核查参考条件和非参考条件下放射治疗剂量学参数方法可靠,简单易行.Objective To verify the reliability of dose parameters of radiotherapy under reference and non-reference conditions by using TLD.Methods Dose parameters were verified by using TLDs under reference and non-reference conditions,including the maximum dose in axel of 5 electron beams with energy of 9 MeV and the variations of dose by depth,source-skin distance,exposure field and 45＆#176; wedge for 10 photon beams with energy of 6 MV in 5 hospitals.Results The average relative deviation of 6 MV photon beam measured between TLDs and finger ionization chambers were 4.45%,within±7% as required by IAEA.The average relative deviation of 9 MeV electron beam measured between TLDs and plane parallel chambers were 2.45%,within± 5% was required by IAEA.Conclusions Measuring dosimetric parameters by using TLDs under reference and non-reference conditions was reliable and feasible.

关 键 词：热释光剂量计 参考与非参考条件 指形电离室 平行板电离室 光子线束 电子线束 

分 类 号：R144[医药卫生—公共卫生与预防医学]