Energy response and filter compensation of PIN Si photodiode for personal dosimetry application

The electron-photon cascade Monte Carlo code EGS4 is used to study the energy response of the detector-grade low-cost PIN Si photodiode, which is used as the detector for a personal dosimetry application. The energy deposition distribution in the active volume of the photodiode is calculated. The effect of the discrimination level and the dimension of the active volume on the sensitivity of the photodiode is studied. The sensitivities of the photodiode with Cu, Sn, Cu+Sn, and Pb compensation filters, respectively, are investigated in detail. The energy response of the Si photodiode is measured in the X-ray calibration field with effective energies from 46 to 202 keV, and by using Cs-137 and Co-60 gamma -ray sources. Good agreement is obtained between results of the measurement and the Monte Carlo calculation.<
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