Characterization of carbon fiber window HPGe detector using Computed Tomography

HPGe detector characterization is the determination of the geometric parameters of the detector as precisely as possible in gamma spectrometric studies. This is accomplished by a procedure that combines efficiency measurements obtained from experimental and Monte Carlo simulations. One way to perform a correct characterization of the detector is to use X-ray equipment to produce images of the detector components. Optimal dimensions were determined from the values given by the manufacturer and the values obtained from the X-ray image and used in the Monte Carlo simulation. The characterization of the carbon fiber windowed HPGe detector was performed using the experimental efficiency calculations calculated at 10 and 15 cm distances with point sources with energies between 59.5 and 1836.1 keV and the efficiency values obtained from the Monte Carlo method. The results of the study showed that the discrepancy between the simulated efficiency values and the experimental efficiency values decreased from 6.5 % to 18.4 % with the manufacturer's data to 0 %-2.1 % with the optimal values obtained after characterization. This agreement with the determined optimal values at two different distances and 7 different energies shows that the germanium dead layer thickness, which is a dynamic parameter of the detector, has also been determined correctly.