DocumentCode
1518467
Title
Study of energy response of Gd2SiO5:Ce3+ scintillator for the ASTRO-E hard X-ray detector
Author
Uchiyama, Yasunobu ; Kouda, Manabu ; Tanihata, Chiharu ; Isobe, Naoki ; Takahashi, Tadayuki ; Murakami, Toshio ; Tashiro, Makoto ; Makihima, K. ; Fukazawa, Yasushi ; Kamae, Tsuneyoshi
Author_Institution
Inst. of Space & Astron. Sci., Kanagawa, Japan
Volume
48
Issue
3
fYear
2001
fDate
6/1/2001 12:00:00 AM
Firstpage
379
Lastpage
384
Abstract
The energy-dependent response of the crystalline oxide scintillator Gd2SiO5:Ce3+ (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 response are confirmed. To evaluate the response across the K-edge quantitatively, we measure the “electron response” by means of the Compton coincidence technique. By using the electron response 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 241Am is well modeled by a composite Gaussian. This will be discussed in terms of the light yield nonproportionality
Keywords
X-ray astronomy; X-ray detection; calibration; cerium; gadolinium compounds; scintillation; solid scintillation detectors; 14 to 662 keV; 241Am; ASTRO-E hard X-ray detector; GSO:Ce; Gd2SiO5:Ce; Gd2SiO5:Ce3+ scintillator; HXD flight model; K-edge; crystalline oxide scintillator; electron response; energy response; energy-dependent response; light yield nonproportionality; light yields; preflight calibration; Calibration; Crystallization; Electrons; Extraterrestrial measurements; Photonic crystals; Physics; Radiation detectors; Satellites; X-ray detectors; X-ray imaging;
fLanguage
English
Journal_Title
Nuclear Science, IEEE Transactions on
Publisher
ieee
ISSN
0018-9499
Type
jour
DOI
10.1109/23.940084
Filename
940084
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