宇航计测技术 ›› 2022, Vol. 42 ›› Issue (3): 30-35.doi: 10.12060/j.issn.1000-7202.2022.03.06

• 量值传递技术 • 上一篇    下一篇

H-450 X射线参考辐射质的研建及验证

杭仲斌1，王红玉1，杨静1，刘川凤2，滕忠斌1，徐阳1，韦凯迪1，耿璇1，张昕宇1，魏可新1，宋明哲1*   

  1. 1.中国原子能科学研究院，计量与校准技术重点实验室，北京 102413；2.中国计量科学研究院，北京 100029
  • 出版日期:2022-06-25 发布日期:2022-12-24
  • 通讯作者: 宋明哲（1983-），男，研究员、硕士生导师，博士，主要研究方向：电离辐射计量技术。
  • 作者简介:杭仲斌（1993-），男，在读博士，主要研究方向：电离辐射计量技术。

Establishment and Verification of H-450 X-ray Reference Radiation Quality

HANG Zhong-bin1,WANG Hong-yu1,YANG Jing1,LIU Chuan-feng2,TENG Zhong-bin1,XU Yang1,WEI Kai-di1,GENG Xuan1,ZHANG Xin-yu1,WEI Ke-xin1,SONG Ming-zhe1*   

  1. 1.China Institute of Atomic Energy,Key Laboratory of measurement and calibration technology,Beijing 102413,China；2.National Institute of Metrology,Beijing 100029,China
  • Online:2022-06-25 Published:2022-12-24

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摘要： 根据PTB和ISO 4037-1:2019要求，关于高空气比释动能系列（H系列）X射线参考辐射质的推荐数据，外推得出H-450的附加过滤为6.24 mm Cu，第一半值层（HVL1st）为(5.39~5.52)mm Cu，平均光子能量为(214.25~214.78)keV，剂量率为11.51 Gy/h（距离焦斑为1 m处，管电流为10 mA）。随后，使用PTW32005电离室作为测量器具，采用半值层法建立H-450 X射线参考辐射质，得出HVL1st为5.37 mm Cu，第二半值层（HVL2nd）为5.97 mm Cu，同质系数为0.9。最后，使用PTW30013次级标准电离室测量得出H-450 X射线参考辐射质下距离焦斑1 m，管电流为10 mA时的剂量率值为11.98 Gy/h，与理论值的相对误差为4.07 %。采用MCNP 5软件对H-450 X射线参考辐射质进行能谱模拟并计算得出其平均光子能量为200.4 keV。

关键词: X射线, 参考辐射, 外推法, 辐射质, 半值层, MCNP5

Abstract: Based on the recommended data from PTB and ISO 4037-1:2019 on the high air kerma series (H series) X-ray reference radiation quality,it is extrapolated that the additional filtration of H-450 is 6.24 mm Cu,the first half value layer (HVL1st) is (5.39~5.52) mm,the average photon energy is (214.25~214.78) keV,and the dose rate is 11.51 Gy/h (the distance between the focal spot and the point test is 1 m,the tube current is 10 mA).Subsequently,the H-450 X-ray reference radiation quality was established by the half-value layer method and the PTW32005 ionization chamber as the measuring instrument.It is obtained that HVL1st is 5.37 mm Cu,the second half value layer (HVL2nd) is 5.97 mm Cu,and the homogeneity coefficient is 0.9.Finally,the dose rate of H-450 X-ray reference radiation measured by PTW30013 secondary standard ionization chamber is 1.198 Gy/h,on condition that the distance between the focal spot and the point test is 1 m and the tube current is 10 mA,and the relative error with the theoretical value is 4.07 %.The energy spectrum of H-450 X-ray reference radiation is simulated by MCNP5 software,and the average photon energy is calculated as 200.4 keV.

Key words: X-ray, Reference radiation, Extrapolation, Radiative mass, Half value layer, MCNP5

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