Response calculation of a stacked CdZnTe detector for 16N γ-ray measurement

Nishizawa, Hiroshi; Inujima, Hiroshi; Usami, Teruo; Fujiwara, Hirotsugu; Nakamura, Hiroaki

doi:10.1016/s0168-9002(01)00226-1

Cited by 6 publications

(6 citation statements)

References 6 publications

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“…Stacking thin CdTe devices is a new concept to realize a detector with both high energy resolution and good efficiency for gamma rays up to several hundred keV [12], [13]. Here, we present results obtained with a prototype CdTe stacked detector made of large CdTe diode detectors of 21.5 mm 21.5 mm.…”

Section: Introductionmentioning

confidence: 98%

CdTe stacked detectors for gamma-ray detection

Watanabe

Takahashi

Okada

et al. 2002

IEEE Trans. Nucl. Sci.

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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.Index Terms-Cadmium telluride (CdTe), CdTe diode detector, cadmium zinc telluride (CdZnTe), stacked detector.

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Section: Introductionmentioning

confidence: 98%

CdTe stacked detectors for gamma-ray detection

Watanabe

Takahashi

Okada

et al. 2002

IEEE Trans. Nucl. Sci.

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“…Stacking thin CdTe devices is a new concept to realize a detector with both high energy resolution and good efficiency for gamma-rays up to several hundred keV [8], [9].…”

Section: Introductionmentioning

confidence: 99%

CdTe stacked detectors for gamma-ray detection

Watanabe¹,

Takahashi²,

Okada³

et al.

2001 IEEE Nuclear Science Symposium Conference Record (Cat. No.01CH37310)

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We describe a stacked detector made of thin 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 CdZnTe detectors. However, a CdTe detector with a thickness of more than 5 mm is needed for adequate detection efficiency for gammarays 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 ( ∼ 1 % ) and good efficiencies for gamma-rays up to several hundred keV. In this paper, we report the advantage of CdTe thin detectors and the performance of CdTe stacked detectors made of ten layers of a 0.5 mm thick CdTe diode detectors with a surface area of 21.5 mm × 21.5 mm.

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“…19 Finally, in order to increase photon absorption of the CZT detector, it is possible to stack multiple CZTs with small thicknesses and connect corresponding signal electrodes together. 20,21 In this geometry the photon absorption will be increased according to the total thickness of the CZTs in the stack, while hole trapping and charge sharing will be minimized.…”

Section: Introductionmentioning

confidence: 99%

CZT detectors used in different irradiation geometries: Simulations and experimental results

Fritz

Shikhaliev

2009

Medical Physics

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The purpose of this work was to evaluate potential advantages and limitations of CZT detectors used in surface-on, edge-on, and tilted angle irradiation geometries. Simulations and experimental investigations of the energy spectrum measured by a CZT detector have been performed using different irradiation geometries of the CZT. Experiments were performed using a CZT detector with 10 x 10 mm2 size and 3 mm thickness. The detector was irradiated with collimated photon beams from Am-241 (59.5 keV) and Co-57 (122 keV). The edge-scan method was used to measure the detector response function in edge-on illumination mode. The tilted angle mode was investigated with the radiation beam directed to the detector surface at angles of 90 degrees, 15 degrees, and 10 degrees. The Hecht formalism was used to simulate theoretical energy spectra. The parameters used for simulations were matched to experiment to compare experimental and theoretical results. The tilted angle CZT detector suppressed the tailing of the spectrum and provided an increase in peak-to-total ratio from 38% at 90 degrees to 83% at 10 degrees tilt angle for 122 keV radiation. The corresponding increase for 59 keV radiation was from 60% at 90 degrees to 85% at 10 degrees tilt angle. The edge-on CZT detector provided high energy resolution when the beam thickness was much smaller than the thickness of CZT. The FWHM resolution in edge-on illumination mode was 4.2% for 122 keV beam with 0.3 mm thickness, and rapidly deteriorated when the thickness of the beam was increased. The energy resolution of surface-on geometry suffered from strong tailing effect at photon energies higher than 60 keV. It is concluded that tilted angle CZT provides high energy resolution but it is limited to a 1D linear array configuration. The surface-on CZT provides 2D pixel arrays but suffers from tailing effect and charge build up. The edge-on CZT is considered suboptimal as it requires small beam thickness and also suffers from charge buildup.

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Response calculation of a stacked CdZnTe detector for 16N γ-ray measurement

Cited by 6 publications

References 6 publications

CdTe stacked detectors for gamma-ray detection

CdTe stacked detectors for gamma-ray detection

CdTe stacked detectors for gamma-ray detection

CZT detectors used in different irradiation geometries: Simulations and experimental results

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