6～70keV同步辐射X射线能量标定

为建立高注量率同步辐射X射线计量领域相关的国家标准,对同步辐射X射线能量标定方法进行研究。在北京同步辐射装置上选择6、10和20keV三个能量点进行实验,得到的传递探测器校准因子与辐射能量的关系曲线近似直线,变化趋势呈线性递减;在20keV能量点,不同直径光阑条件下进行的标定实验验证了传递探测器的校准因子与光源照射到基准电离室与传递探测器的光子通量有关。在上海光源上进行10～70keV能量标定实验,得到传递探测器的校准因子拟合曲线;10～20keV能量段的变化趋势与在北京同步辐射装置得到的校准因子变化趋势一致,30～70keV能量段的校准因子随着能量的增加而平稳缓慢增大。对各个能量点标定产生的A类不确定度进行评定,为后续建立国家计量标准同步辐射X射线空气比释动能量值传递体系提供了技术数据。

Calibration of Synchrotron Radiation X-ray Energy from 6keV to 70keV

In order to establish relevant national standards in the field of synchrotron radiation X-ray measurement with high fluence rate, the calibration method of synchrotron radiation X-ray energy was studied.Three energy points of 6, 10 and 20keV were selected on the Beijing Synchrotron Radiation Facility for experiments, and the relationship curve between the calibration factor of the transfer standard detector and the radiant energy was approximated to a straight line, and the change trend showed a linear decrease. The calibration experiment at 20keV energy point and different diameter aperture conditions verified that the calibration factor of the transfer detector is related to the photon flux when the light source irradiates to the reference ionization chamber and the transfer detector. 10～70keV energy calibration experiment was conducted on Shanghai Synchrotron Radiation Facility, the fitting curve of transfer standard detectors calibration factor was obtained. The change trend of the energy in 10～20keV is consistent with the change trend of the calibration factor obtained in the Beijing synchrotron radiation device. The calibration factor of the 30～70keV energy segment increases steadily and slowly with the increase of energy. The class A uncertainties of the calibration expriment of each energy point were evaluated, which provided technical data for subsequent establishment of the national measurement standard synchrotron radiation X-ray air specific release kinetic energy value transmission system.