NaI 晶体谱仪采集 X 射线能谱测量方法研究

摘要

为准确测量轫致辐射X射线能谱，利用NaI晶体谱仪对于测量光子的能谱展宽效应，结合理论模拟分析，提出了采用变能量矩阵求解法实现X射线能谱的重建。该方法通过合理选择能量区间，可有效消除能谱响应矩阵中各矢量的相关性，从而实现能谱的准确重建。并分别以均匀能谱分布和实际轫致辐射X射线能谱为例，进行了X射线的能谱重建。获得结果与原始能谱的相关性约为0．98。%The matrix solving method with varying energy bin is employed to realize the construction of X-ray energy spectrum using the effect of energy-spectrum-widen and binding the theory analysis in this paper.For the matrix solving method, we can dispel the correlation of every vector in the matrix so as to achieving the ac-curate spectrum results through choosing suitable energy bins.Then, to test the matrix solving method, X-ray with uniform energy distribution and real bremsstrahlung X-ray were taken as the original incident source re-spectively, and the two constructed spectrum were achieved.The comparison results show that the matrix solving method is useful and the correlation parameter of the original spectrum and the constructed results is about 0.98.