Dead layer thickness characterization of an HPGe detector by measurements and Monte Carlo simulations

To fully characterize the front dead layer (DL) of an HPGe detector at low photon energy range, its intrinsic efficiency curve was measured using a 241Am radioactive source in 10−60 keV energy range. A comparison between experimental efficiency and MCNPX results showed that the DL value of 0.4 μm initially quoted by the manufacturer has to be changed to 7.5 μm to reproduce measurements.

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