Study of energy response of Gd2SiO5:Ce3+scintillator for the ASTRO-E hard X-ray detector

被引:28
作者
Uchiyama, Y
Kouda, M
Tanihata, C
Isobe, N
Takahashi, T
Murakami, T
Tashiro, M
Makishima, K
Fukazawa, Y
Kamae, T
机构
[1] Inst Space & Astronaut Sci, Sagamihara, Kanagawa 2298510, Japan
[2] Univ Tokyo, Dept Phys, Tokyo 1130033, Japan
[3] Saitama Univ, Dept Phys, Urawa, Saitama 3388570, Japan
[4] Hiroshima Univ, Dept Phys Sci, Higashihiroshima 7398526, Japan
关键词
Gd2SiO5 (GSO); scintillator; X-ray;
D O I
10.1109/23.940084
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
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 Am-241 is well modeled by a composite Gaussian. This will be discussed in terms of the light yield nonproportionality.
引用
收藏
页码:379 / 384
页数:6
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