γ射线后装治疗辐射源的质量保证方法  

Methods on Quality Assurance of γ-ray Source of Afterloading Devices

作　　者：张庆钊 曹小龙 陈梅芬 黄颂钊 胡家柱 

机构地区：[1]广州市番禺区中心医院设备科,广东广州511400

出　　处：《中国医疗设备》2012年第3期33-35,共3页China Medical Devices

摘　　要：获得准确的源强度是表面敷贴放疗剂量与体内治疗剂量计算的基础。在国外,美国医学物理学会(AAPM)制定有直观的放射源校准规程——《在空气中校准》。该方法比较合理、准确、可靠,但是散射修正比较复杂。我国也有国家制定的《192Ir源活度校准规程》,它与AAPM推荐的校准方法的最大区别在于它是在水中校准。事实上,在国内很少有医院对后装192Ir源外观活度进行校准。本文探讨用外照射的小水箱来测量后装放射源活度的方法,测量的结果说明了源活度是基本准确的,符合国家校准规程要求。Obtaining accurate apparent activity of source is the base stone of the dose calculation of surface applicator brachytherapy and interstitial and intracavitary brachytherapy.There are explicit protocols for source calibration in AAPM that is source calibration in-air.And this way is more reasonable,veracity and reliable,however,the correction of scatter from all surfaces in the room is complicate.There is a protocol of calibrations for apparent activity of afterloading iridium-192 source in our country.The most different is that it is calibrated in-water phantom,there are little hospitals calibrating the apparent activity of afterloading iridium-192 according to this protocol.The paper discussed the method of measuring afterloading radiation source activity with small water phantom.The result demonstrates the apparent activity of afterloading iridium-192 source is veracity.

关 键 词：Γ射线 后装机 外观活度 放射源校准 

分 类 号：R144[医药卫生—公共卫生与预防医学]