光学精密工程2017，Vol.25Issue(11)：2845-2851,7.DOI:10.3788/OPE.20172511.2845
同步辐射硬X射线光子通量的绝对测量
Absolute measurement of photon flux for synchrotron radiation hard X-rays
摘要
Abstract
The photon flux of the synchrotron radiation hard X-rays was measured in Beijing Synchrotron Radiation Facility (BSRF) using a free-air ionization chamber .Absolute air-kerma can be obtained with the free-air ionization chamber .The photon flux was calculated based on the relation between air-kerma and flux in the fundamental quantities and units for ionizing radiation .Because the photon flux changes over time during the measurement ,an online monitoring system was applied ,and the uncertainty of which is 0 .03% . The air attenuation correction factor and ion recombination correction factor were measured at 15 keV synchrotron radiation X-rays .The measurement results show that the absolute air-kerma rate at 15 keV synchrotron radiation X-rays is 0 .239 Gy/s ,accordingly ,the photon flux of the source is 5 .28 × 109 photons/s ,the relative uncertainty is 0 .68% .关键词
同步辐射硬X射线/绝对测量/自由空气电离室/空气比释动能/光子通量Key words
synchrotron radiation hard X-rays/absolute measurement/free air ion chamber/air-kerma/photon flux分类
数理科学引用本文复制引用
李华鹏,郑伟宁,赵屹东,王培玮,李凡..同步辐射硬X射线光子通量的绝对测量[J].光学精密工程,2017,25(11):2845-2851,7.基金项目
自然科学基金面上项目(No.11375227) （No.11375227）
