CdTe stacked detectors for gamma-ray detection

Shin Watanabe*, Tadayuki Takahashi, Yuu Okada, Goro Sato, Manabu Kouda, Takefumi Mitani, Yoshihito Kobayashi, Kazuhiro Nakazawa, Yoshikatsu Kuroda, Mitsunobu Onishi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)1292-1296
Number of pages5
JournalIEEE Transactions on Nuclear Science
Volume49 II
Issue number3
Publication statusPublished - 2002 Jun


  • Cadmium telluride (CdTe)
  • Cadmium zinc telluride (CdZnTe)
  • CdTe diode detector
  • Stacked detector

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Nuclear Energy and Engineering


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