Energy calibration of the GEMPix in the energy range of 6 keV to 2 MeV

Abstract The GEMPix is a small gaseous detector with highly pixelated readout, consisting of drift region, three Gas Electron Multipliers (GEMs) for signal amplification, and four Timepix ASICs 55 ?m pixel pitch total 262,144 pixels (512×512 pixels). A continuous flow gas mixture (here propane-based tissue equivalent gas) supplied externally at rate 5 L/h. By placing sealed 241 Am source outside the varying source-detector distance, residual energy alpha particles entering sensitive volume through thin Mylar window varied. An spectrometry measurement was performed to determine emission spectrum source, this then used as an input FLUKA Monte Carlo simulation obtain particles. Thus, calibration curve from 5.9 keV (from Fe source) up more than 2 MeV obtained, which needed future applications detector, in particular microdosimetry.