Absolute measurement of radiant power for synchrotron radiation monochromatized X-rays
作者机构：Institute of High Energy PhysicsChinese Academy of SciencesBeijingChina National Institute of MetrologyBeijingChina University of Chinese Academy of SciencesBeijingChina
出 版 物：《Radiation Detection Technology and Methods》 (辐射探测技术与方法（英文）)
年 卷 期：2020年第4卷第1期
页 面：97-105页
学科分类：07[理学] 070202[理学-粒子物理与原子核物理] 0702[理学-物理学]
基 金：the National Key R&D Program of China under Grant No.2017YFF0205102 the National Natural Science Foundation of China under Grant No.11375227 the Joint Funds of the National Natural Science Foundation of China under Grant No.U1632264
主 题：Absolute measurement Radiant power Free-air ionization chamber Synchrotron radiation X-ray
摘 要：Purpose Absolute measurement of radiant power in the X-ray region is essential for many applications in astrophysics,spectroscopy,and X-ray *** paper presents a dependable method of absolute measurement of radiant power for synchrotron radiation monochromatized *** A free-air ionization chamber was examined closely and employed as the detector in the present *** measuring principle was discussed,and the correction factors were *** measurement of radiant power for synchro-tron radiation monochromatized X-rays in the region of 6-20 keV was performed using the free-air ionization chamber at Beijing Synchrotron Radiation *** a verification and an important application,photodiodes were calibrated against the free-air ionization *** Relative standard uncertainties of absolute measurement using free-air ionization chamber are about 1%.Calibration of photodiodes within the photon energy range from 6 to 20 keV has relative standard uncertainties below 1.5%.Conclusion The free-air ionization chamber is qualified to be used in many disciplines to support the measurement of opti-cal radiation.
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