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~(60)Co远距离治疗机在肿瘤放射治疗中得到广泛的应用。一台治疗机安装后或者在更换钴源以后,要对线束中心的Rmm进行准确的测量,一方面作为放射治疗中剂量计算的依据,另一方面现场判断所装放射源的活度是否达到出厂要求。用一台经过法定计量部门核准的剂量仪和精确的测定,就可以得出较准确的结果。由于~(60)Co源的放射性比度,几何尺寸和结构的不同,实测结果同理论计算值往往会有较大的差别,若没有对各种实际情况的认真分析和处理,有时会产生误解。本文就这方面的问题进行专门的讨论,并确定装机的密封放射源的活度同实测输出量的客观的对应关系,对正确处理分析测量结果会有一定的帮助。
~ (60) Co remote therapy machine in tumor radiotherapy has been widely used. After a treatment machine is installed or after the replacement of cobalt source, the Rmm harness center to be accurate measurements, on the one hand as the radiation dose calculation basis, on the other hand on-site to determine whether the activity of the installed radioactive sources to reach the factory Claim. Using a dosimeter approved by the legal metrology department and accurate measurement, you can get more accurate results. Due to the difference in radioactivity, geometry and structure of the ~ (60) Co source, the measured results tend to be quite different from the theoretical values, and misunderstandings sometimes occur without careful analysis and treatment of various practical situations . In this paper, special discussions on this issue, and to determine the installed sealed radioactive source activity and the measured output of the objective correspondence between the right to deal with the analysis of measurement results will be of some help.