Sato, R.,
Kataoka, J.,
Kanai, Y.,
Ishikawa, Y.,
Kawabata, N.,
Ikagawa, T.,
Saito, T.,
Kuramoto, Y.,
Kawai, N. ..
言語
English
掲載誌/書名
和文:
英文:
Nuclear Instruments and Methods in Physics Research A
巻, 号, ページ
Vol. 556
pp. 535-542
出版年月
2006年1月
出版者
和文:
英文:
会議名称
和文:
英文:
開催地
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英文:
アブストラクト
The avalanche photodiodes (APDs) have attracted considerable attention in various field of experimental physics, but their uses are still limited in only a few experiments, possibly due to their small surface areas. Here, we report the development of the large-area (˜20mm square) APDs, for future applications to high-resolution X-rays and γ-rays detection. We have made two prototypes of reverse-type APDs based on different concepts, one consists of a 2×2 array of 10×10mm pixels (APD1) and the other is a monolithic pixel of 19×19mm size (APD2) to achieve a large effective area. By comparing the dark current and gain characteristics at room temperature (+20C) and lightly cooled environment (-20C), we quantitatively discussed the origin of predominant noise source at different temperatures. As a performance demonstration of newly developed APDs, we made a scintillation γ-ray detector consisting of a 20×20×5mm CsI(Tl) crystal and a 2 cm-square APD. The best FWHM energy resolution of 5.5±0.2% were obtained for 662keVγ-rays at room temperature. Similarly, the best FWHM energy resolution of 8.5±0.2% were obtained for 122 keV γ-rays at lightly cooled environment. We showed that the minimum detectable energy for scintillation light was 15 keV at 20C and less than 5 keV at -20C.
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