4.5—20keV能区Fe的光电截面测量

PHOTOELECTRIC CROSS SECTIONS FOR IRON IN_THE ENERGY RANGE 4.5-20 keV

利用质子束激发单质金属元素靶产生的K线或L线特征x射线及Si(Li)谱仪测量了4.5—20keV能区Fe的x射线衰减系数。对于孤立的较强特征x射线,x射线系数实验误差小于1％。由于谱仪能量分辩限制,形成的重峰,利用XABS解谱程序也得到了各组分谱线较好的实验结果。由总的光子衰减截面扣除散射截面得到了光电截面实验值。与以前的实验结果及理论值进行了比较,并作了讨论。

Attenuation coefficients have been measured for Iron for x-rays in the energy region 4.5-20 keV using x-rays produced by proton excitation of elementary targets and Si (Li) detector. The attenuation coefficients of the individual components of characteristic K x-rays and L x-rays were obtained by XABS computer program. The experimental error of attenuation coefficients were reduced to 1% for intense isolated x-rays. The total photoelectric cross sections, obtained by subtracting scattering cross sections from the measured total cross sections, were compared with the latest theoretical compilations of Scofield.