TY - JOUR
T1 - CdTe stacked detectors for gamma-ray detection
AU - Watanabe, Shin
AU - Takahashi, Tadayuki
AU - Okada, Yuu
AU - Sato, Goro
AU - Kouda, Manabu
AU - Mitani, Takefumi
AU - Kobayashi, Yoshihito
AU - Nakazawa, Kazuhiro
AU - Kuroda, Yoshikatsu
AU - Onishi, Mitsunobu
PY - 2002/6
Y1 - 2002/6
N2 - We describe a stacked detector made of thin cadmium telluride (CdTe) diode detectors. By using a thin CdTe device, we can overcome the charge loss problem due to the small mobility and short lifetime of holes in CdTe or cadmium zinc telluride (CdZnTe) detectors. However, a CdTe detector with a thickness of more than 5 mm is needed for adequate detection efficiency for gamma-rays of several hundred keV. Good energy resolution and good peak detection efficiency are difficult to obtain using such a thick CdTe detector. The stacked detector enabled us to realize a detector with both high-energy resolution and good efficiencies for gamma rays up to several hundred keV. In order to verify this concept, we constructed a prototype made of ten layers of a 0.5-mm-thick CdTe diode detectors with a surface area of 21.5 mm × 21.5 mm. With this, we have achieved 5.3-keV and 7.9-keV energy resolution [full width at half maximum (FWHM)] at 356 keV and 662 keV, respectively, at the temperature of -20°C.
AB - We describe a stacked detector made of thin cadmium telluride (CdTe) diode detectors. By using a thin CdTe device, we can overcome the charge loss problem due to the small mobility and short lifetime of holes in CdTe or cadmium zinc telluride (CdZnTe) detectors. However, a CdTe detector with a thickness of more than 5 mm is needed for adequate detection efficiency for gamma-rays of several hundred keV. Good energy resolution and good peak detection efficiency are difficult to obtain using such a thick CdTe detector. The stacked detector enabled us to realize a detector with both high-energy resolution and good efficiencies for gamma rays up to several hundred keV. In order to verify this concept, we constructed a prototype made of ten layers of a 0.5-mm-thick CdTe diode detectors with a surface area of 21.5 mm × 21.5 mm. With this, we have achieved 5.3-keV and 7.9-keV energy resolution [full width at half maximum (FWHM)] at 356 keV and 662 keV, respectively, at the temperature of -20°C.
KW - Cadmium telluride (CdTe)
KW - Cadmium zinc telluride (CdZnTe)
KW - CdTe diode detector
KW - Stacked detector
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U2 - 10.1109/TNS.2002.1039654
DO - 10.1109/TNS.2002.1039654
M3 - Article
AN - SCOPUS:0036624389
SN - 0018-9499
VL - 49 II
SP - 1292
EP - 1296
JO - IEEE Transactions on Nuclear Science
JF - IEEE Transactions on Nuclear Science
IS - 3
ER -