Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China.
National Institute of Metrology, Beijing 100029, China.
Sensors (Basel). 2023 Jan 15;23(2):1006. doi: 10.3390/s23021006.
Absolute measurement of radiant power in the X-ray region is essential for many applications in astrophysics, spectroscopy, and X-ray diagnostics. Comparison between different measuring methods is an effective way to check their reliability. In the present work, a comparison of X-ray radiant power absolute measurement between a free-air ionization chamber and a cryogenic electrical substitution radiometer was performed at Beijing Synchrotron Radiation Facility. The absolute radiant power obtained by these two methods were mutually compared via a transfer standard detector's spectral responsivity at a photon energy of 10 keV. The result of the comparison showed that the difference was 0.47%. A conclusion was reached that the free-air ionization chamber and the cryogenic electrical substitution radiometer agreed within the combined relative uncertainty of 3.35%.
在天体物理学、光谱学和 X 射线诊断等许多应用中，对 X 射线区域的辐亮度进行绝对测量是至关重要的。不同测量方法之间的比较是检查其可靠性的有效方法。在本工作中，在北京同步辐射装置上对自由空气电离室和低温电替代辐射计的 X 射线辐亮度绝对测量进行了比较。通过在光子能量为 10 keV 时的转移标准探测器的光谱响应度，将这两种方法获得的绝对辐亮度相互比较。比较结果表明，两者的差异为 0.47%。得出的结论是，自由空气电离室和低温电替代辐射计在 3.35%的组合相对不确定度内是一致的。
