邻苯二钾酸氢铊晶体积分衍射效率的标定

Calibration of integral diffraction coefficients of TlAP crystal

以北京同步辐射实验室487中能柬线为光源，在2．1～6．0keV的范围内对邻苯二钾酸氢铊（T1AP）平面晶体一、二、三级衍射的积分衍射效率进行了精确的实验标定。标定结果表明：TIAP晶体有较高的峰值衍射率；其一级衍射的积分衍射效率向低能端有增加的趋势，而在2．6～5．4keV的范围内大约为1．53×10^-4rad随着衍射级次的提高，衍射效率逐渐减小，二级衍射的积分衍射效率约为一级衍射效率的1／4，三级衍射结果比一级衍射下降一个量级。实验所标定的T1AP晶体可用于平晶谱仪对激光等离子体X射线光谱的定量分析。

The first, second and third order integral diffraction coefficients of T1AP crystal were calibrated at 4B7 X-ray source on Beijing synchrotron radiation facility with photon energy ranging from 2.1 keV to 6.0 keV. It is shown that the peak diffraction coefficients of the T1AP crystal are rather high. The first order integral diffraction coefficient tends to increase with the decreasing photon energy. But in the range of 2.6 keV to 5.4 keV, the integral diffraction coefficient is about 1.53× 10^-4 rad. The diffraction coefficients decrease gradually as the diffraction order increases. The second order integral diffraction coefficient is only 1/4 of the first order, and the third order is about one magnitude lower than the first order. The calibrated T1AP crystal can be used to quantitatively analyze X-ray spectrum of laser-produced plasma.