用HXCF测量物质X射线质量衰减系数

摘要

X-ray mass attenuation coefficient is an important physical quantity to study X-ray.Hard X-ray calibration facility(HXCF) has become an ideal device for studying the mass attenuation coefficient as its monochromatic,stable and measurable absolute photon numbers.This experiment use Cu and A1 two materials to measure their mass attenuation coefficients when the X-ray's energy is 30 keV,50 keV,80 keV,100 keV and 110 keV.Then compared the experimental values with NIST reference values,the standard deviations was got.According to the NIST energy-mass attenuation coefficient curves,Cu and Al mass attenuation coefficients under 110 keV were verified and this is the basis for further research.%X射线质量衰减系数是研究X射线的一个重要物理量,硬X射线探测器地面标定装置由于其单色性、稳定性以及其可测的绝对光子数,成为了研究质量衰减系数的一套理想装置.使用Cu、A12种不同材料分别在X射线能量为30 keV、50 keV、80 keV、100 keV和110 keV的情况下对其质量衰减系数进行测量,并将测量值与NIST的参考值进行了对比,得到了其标准偏差.根据NIST提供的质量衰减系数曲线,验证了Cu和Al在110keV处的质量衰减系数,为进一步研究做好了基础.