Consideration of primary recoil electron tracks in the spectral response simulation of thin-film-based radiation detectors

Modeling and response simulation of radiation detectors with Monte Carlo simulation codes are based on the calculation of energy deposition in the detector volume, often obtained by the stochastic process to determine the next event of the incident particle track history in the detector. In this work, we simulated the detector response to gamma rays, by conducting additional simulation processes on the primary electrons which were created from the gamma-ray interaction event. Simulated spectra based only on the energy deposition given by the gamma-ray event were compared with spectral responses obtained by calculating energy deposition from the particle track simulation of primary electrons. The difference appears to be significant as the physical dimension of the detector geometry diminishes (e.g. thin-film based detectors - nanocrystalline material based detectors, representatively), which cannot sufficiently enclose the entire track of primary electrons. In this conference proceeding, we will describe methods how we performed the batch of simulations and show preliminary results about the differences between the simulated spectra.