Abstract
The energy-dependent of the crystalline oxide scintillator Gd/sub 2/SiO/sub 5/:Ce/sup 3+/ (GSO:Ce) is studied in the energy range from 14 to 662 keV as a part of the preflight calibration of the hard X-ray detector (HXD) onboard the ASTRO-E satellite. In the relation between photon energy deposited and light yields, there exists nonproportionality and discontinuity around the energy of the gadolinium K-edge (50.2 keV). In 16 GSO scintillator units of the HXD flight model, the same characteristics of the energy are confirmed. To evaluate the across the K-edge quantitatively, we measure the response by means of the Compton coincidence technique. By using the electron of the GSO crystal, we calculate the light yield nonproportionality as a function of deposited photon energy. We find that a photopeak line profile of the 59.5-keV emission of /sup 241/Am is well modeled by a composite Gaussian. This will be discussed in terms of the light yield nonproportionality.
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