Response function estimation for the XCounter Flite X1 photon counting detector using Monte Carlo method

The goal of this paper is to acquire the energy response functions precisely with enough accuracy for spectral restoration and reconstruction. In this work we estimate the response functions of the XCounter Flite X1 detector by measuring the spectrum of the X-ray fluorescence. The incident spectrum and the deposited spectrum are simulated by the Monte Carlo method using Geant4. The broadening of deposition energy is described by the Gaussian distribution model, while the charge sharing and other effects are described by the phenomenological model, and the energy response functions consist of the two models. The results show that the model is accurate and we can correct the measured spectrum based on the response functions.