直线加速器高能光子束吸收剂量的测量
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摘要
目的 :为了保证直线加速器吸收剂量的稳定,对直线加速器进行吸收剂量的测定。方法 :采用IAEA TRS-277推荐的电离室测定法,现场测量高能光子束在水中的吸收剂量,所用加速器为医科达1629直线加速器,剂量率为400 MU/min,指针的值为100 MU,分别测量15和6 MV 2挡射线。结果:15 MV射线所得结果均高于标准剂量,6 MV射线所得结果均低于标准剂量,且后者误差要比前者大,但是二者都在规定误差±2%之内。结论 :实验结果在允许范围内,直线加速器不需要校准,可正常工作。
Objective To measure the absorbed dose of the linear accelerator. Methods Ionization chamber detection suggested in IAEA TRS-277 was used to measure on-site absorbed dose of the high-energy photon beam in water, with Elekta 1629 linear accelerator, dose rate as 400 MU/min, indicated value as 100 MU, 15 and 6 MV rays as the subjects.Results The results for the 15 MV ray were all higher than the standard dose, and the ones for the 6 MV ray were all lower the standard dose; the latter had the errors higher than the former, while the two ones had the errors within ±2%.Conclusion The experimental results are within allowable range, and the linear accelerator can work normally without adjustment.
Objective To measure the absorbed dose of the linear accelerator. Methods Ionization chamber detection suggested in IAEA TRS-277 was used to measure on-site absorbed dose of the high-energy photon beam in water, with Elekta 1629 linear accelerator, dose rate as 400 MU/min, indicated value as 100 MU, 15 and 6 MV rays as the subjects.Results The results for the 15 MV ray were all higher than the standard dose, and the ones for the 6 MV ray were all lower the standard dose; the latter had the errors higher than the former, while the two ones had the errors within ±2%.Conclusion The experimental results are within allowable range, and the linear accelerator can work normally without adjustment.
引文
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[2]姜庆寰,刘雅,程金生,等.放射治疗剂量仪的校准及校准因子的使用[J].中国医疗器械信息,2008,14(4):31-33.
[3]张绍刚.放射治疗中常规剂量的测算(之一):吸收剂量的测量和加速器的刻度[J].医疗装备,2009,22(4):1-10.
[4]姜庆寰,刘雅,程金生,等.放疗剂量仪的校准与使用中的问题[J].中国辐射卫生,2008,17(2):185-186.
[5]张绍刚,胡家成,杨小元,等.医用加速器输出剂量的测量与校准[J].现代测量与实验室管理,2003,11(5):9-12.
[6]胡家成,杨小元,马长征,等.放射治疗中治疗计划输出剂量的验证[J].现代测量与实验室管理,2004,12(4):3-4.
[7]王春燕,刘漪,曲典,等.三维水箱模体中辐射剂量分布的模拟研究[J].核电子与探测技术,2009,29(2):309-311.
[8]曾自力.加速器吸收剂量测量的国标法与IAEA法的比较[J].中国辐射卫生,2004,13(3):198-199.
[9]李军,张西志,谭飞.高能X线和电子束吸收剂量的测量与计算[J].中国医学物理学,2008,25(2):564-566.
[10]杨振,涂青松,刘忠宇.平衡帽材料对准直器散射因子测量值的影响探讨[J].中国医学物理学,2001,8(1):1-4.
[11]杨瑞峰,黄辉,何涛.Siemens primus E医用直线加速器的剂量校准[J].医疗卫生装备,2009,30(4):115-117.
[12]朱前升,曾自力.基于JJG 589—2008的医用电子直线加速器电子束剂量刻度方法测定[J].医疗卫生装备,2014,35(1):103-105.