以ISO 4037中推荐的低空气比释动能率系列过滤X射线参考辐射为研究对象,设计合理的半值层测量实验,测量获取第一半值层的值;对建立的辐射质,利用碲锌镉能谱仪测量其过滤X射线能谱,将测量得到的脉冲高度谱经过数据处理和转换,计算出平均能量;根据X射线在材料铝和铜中的衰减规律,拟合单能X射线衰减曲线,计算出该系列过滤X射线的有效能量。测量和计算结果与推荐值进行了比较,两者符合较好。与ISO的半值层数值进行对比,偏差均小于5.0%。
Abstract
The filtered X-ray reference radiation of low air kerma rate series recommended by ISO 4037 was selected as the research object, the reasonable half-value layer measurement experiment was designed,the values of the first half-value layers were obtained. For the established radiation quality, the filtered X-ray energy spectrum was measured by CdZnTe spectrometer, then the measured pulse height spectrum was processed and converted to calculate the average energy. According to the attenuation law of X-ray in the material aluminum and copper, a single-energy X-ray attenuation curve was fitted to calculate the effective energy of the series of the filtered X-rays. The measured and calculated results were compared with the recommended values, and both are in good agreement. Compared with the half value layer of ISO, the deviations are less than 5.0%.
关键词
计量学 /
低空气比释动能率 /
过滤X射线 /
半值层 /
能谱
Key words
metrology /
low air kerma rate;filter X-ray;half value layer;energy spectrum
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参考文献
［1］ISO 4037-1-1996 X and gamma reference radiation for calibrating dosemeters and doserate meters and for deter-mining their response as a function of photon energy Part 1: Radiation characteristics and production methods ［S］. 1996.
［2］扈尚泽, 邢立腾. 过滤X射线参考辐射半值层的测量 ［J］. 计量技术, 2011,(6): 29-31.
Hu S Z, Xing L T. Measurement of half-value layer for filtered X-ray reference radiation ［J］. Metrology Tech-nology, 2011,(6): 29-31.
［3］杜海燕, 吴金杰, 廖振宇, 等. X射线半值层测量方法研究 ［J］. 计量学报, 2016, 37 (z1): 29-33.
Du H Y, Wu J J, Liao Z Y, et al. Research on measurement method of X-ray half-value layer ［J］. Acta Meteologica Sinica, 2016, 37 (z1): 29-33.
［4］李景云, 毕全理, 胡家成, 等. 过滤X射线参考辐射 ［J］. 辐射防护, 1988, 8 (6): 410-417.
Li J Y, Bi Q L, Hu J C, et al. Filtered X-ray reference radiation ［J］. Radiation Protection, 1988, 8 (6): 410-417.
［5］姚馨博, 吴金杰, 王玉龙, 等. CdTe探测器能量刻度与探测效率的模拟计算 ［J］. 计量学报, 2017, 38 (3): 372-375.
Yao X B, Wu J J, Wang Y L, et al. Simulation calculation of energy calibration and detection efficiency of CdTe detector ［J］. Acta Meteologica Sinica, 2017, 38 (3): 372-375.
［6］牛强, 张庆利, 金成赫, 等. 低空气比释动能率和窄谱系列过滤X射线参考辐射能谱测量和分析 ［J］. 辐射防护, 2012, 32 (5): 265-272.
Niu Q, Zhang Q L, Jin C H, et al. Measurement and analysis of energy spectrum for low air kerma rate and narrow spectrum series filtered X-ray reference radiation ［J］. Radiation Protection, 2012, 32 (5): 265-272.
［7］郭思明, 刘莹, 吴金杰. 乳腺X射线基准装置半值层的测量 ［J］. 计量学报, 2018, 39 (3): 410-413.
Guo S M, Liu Y, Wu J J. Measurement of the half-value layer of the mammary X-ray reference device ［J］. Acta Meteologica Sinica, 2018, 39 (3): 410-413.
［8］房宗良, 张圈世. X射线韧致辐射谱的能谱转化技术 ［J］. 核电子学与探测技术, 2003, 23 (5): 407-410.
Fang Z L, Zhang Q S. Energy spectrum conversion technology of X-ray bremsstrahlung spectrum ［J］. Nu-clear Electronics and Detection Technology, 2003, 23 (5): 407-410.
［9］杜海燕, 李凡, 吴金杰, 等. 同步辐射单能X射线空气质量衰减系数的测量 ［J］. 计量学报, 2019, 40 (2): 333-336.
Du H Y, Li F, Wu J J, et al. Measurement of air quality attenuation coefficient of synchrotron radiation single en-ergy X-ray ［J］. Acta Meteologica Sinica, 2019, 40 (2): 333-336.
［10］张德亮, 吴金杰, 杜海燕, 等. 低空气比释动能率X射线参考辐射质的建立 ［J］. 核电子学与探测技术, 2018, 38 (2): 217-222.
Zhang D L, Wu J J, Du H Y, et al. Establishment of X-ray reference radiation quality with low air kerma rate ［J］. Nuclear Electronics and Detection Technology, 2018, 38 (2): 217-222.
［11］葛双, 吴金杰, 郭彬, 等. (20～300)kV X射线参考辐射装置的建立 ［J］. 核电子学与探测技术, 2016, 36 (1): 68-72.
Ge S, Wu J J, Guo B, et al. Establishment of (20～300) kV X-ray reference radiation device ［J］. Nuclear Electronics and Detection Technology, 2016, 36 (1): 68-72.
［12］李德红,黄建微,沙比哈·吐尔逊,等. g因子的蒙特卡罗模拟计算［J］. 计量学报, 2019, 40(5): 920-923.
Li D H, Huang J W, Shabiha Tuerxun, et al. Monte Carlo Simulation Method for g Factor［J］. Acta Metrologica Sinica, 2019, 40(5): 920-923.
［13］蒋伟. 防护水平X射线个人剂量当量的测量与研究 ［D］. 成都: 成都理工大学, 2014.
［14］Seelentag W W. 过滤X射线韧致辐射谱的等效半值层和平均能量［J］. 国外计量, 1981,(3):60-63.
［15］赵瑞, 吴金杰, 樊松,等. 环境水平X射线辐射质的建立及监测仪表校准方法研究 ［J］. 计量学报, 2018, 39 (6A): 131-136.
Zhao R, Wu J J, Fan S, et al. Establishment of Environmental Level X-ray Radiation Qualities and Research of the Calibration Methods of Monitoring Ins-truments［J］. Acta Metrologica Sinica, 2018, 39 (6A): 131-136.
［16］吴金杰, 王培玮, 段小娟, 等. 低能X射线基准辐射装置的建立 ［J］. 计量学报, 2011, 32 (z1): 9-13.
Wu J J, Wang P W, Duan X J, et al. The Establishment of Radiation Primary Standard in the Range of Low Energy X-rays［J］. Acta Metrologica Sinica, 2011, 32 (z1): 9-13.
基金
国家重点研发计划(2017YFF0205101)
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