X线剂量测量中IAEA TRS398和TRS277号报告的比较

Compare study on the dosimetry of x-ray between IAEA TRS398 and TRS277 report

目的比较按IAEA TRS398和TRS277号报告推荐方法测量医用X线绝对剂量的差异。方法用IBA公司DOSE1剂量仪、FC65-G指形电离室及NE2570型Farmer没量仪和2571型电离室,分别按照TRS398和TRS277号报告的要求,对Elekta公司电子直线加速器三档光子线(6mV,10mV,15mV)进行测量,并对结果进行比较。结果分别采用不同的剂量仪和不同的测量规程得到的结果基本相同。用DOSEl剂量仪两种方法测量相对偏差为2.99%0-7.07%0。结论用TRS398号报告测量得到的结果比TRS277报告测量的结果都偏大,但是两者的误差都小于1%,能够满足国标要求的将测量误差控制在2%以内的要求。

Objective:To compare the dosimetry of x-ray between IAEA TRS398 and TRS277 report. Methods:Adopting the different recommendation methods from IAEA TRS398 and TRS277 report, three kinds of X ray(6 mV,1 0 mV,1 5 mV)of the eleetron linear accelerator of ELEKTA company were measured by the Farmer 2502/3 dosimeter and IBA DOSE 1 dose meter respectively.Then compare the result.Results: The results were similar for different methods and different dose meters.The relative standard deviation1 with different methods is 2.99‰～7.07‰.Conclusions:The measurement value adopted the recommendation method from the TRS398 report is higher than TRS277,however the error is lessthan 1%,is satisfied with the international standard (less than 2%).