Recent development of radiation measurement instrument for industrial and medical applications

Baba, Sueki; Ohmori, K.; Mito, Y.; Tanoue, Toshiya; Yano, Shigeki; Tokumori, Kenji; Fukai, Tomoki; Kanda, Shigenobu

doi:10.1016/s0168-9002(00)00930-x

Cited by 10 publications

(5 citation statements)

References 4 publications

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“…Therefore, CdTe offers room-temperature operation and a high absorption efficiency for application as X-and -ray detectors. These devices have been used in a wide range of applications, such as medical 1) and industrial imaging, 2) and X-and -ray astronomy. 3) The energy resolution of X-and -ray detectors is one of the important factors for practical use, but it strongly depends on the leakage current of the detector.…”

Section: Introductionmentioning

confidence: 99%

Quantitative Analysis of Polarization Phenomena in CdTe Radiation Detectors

Toyama

Higa

Yamazato

et al. 2006

Jpn. J. Appl. Phys.

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Polarization phenomena in a Schottky-type CdTe radiation detector were studied. We evaluated the distribution of electric field in a biased CdTe detector by measuring the progressive change of Schottky barrier lowering with time. The parameters of deep acceptors such as detrapping time, concentration, and the depth of the energy level were quantitatively evaluated. In the case of applying the conventional model of charge accumulation, the obtained result shows that the CdTe bulk is never undepleted. We modified the charge accumulation model by taking account of the occupation state of the deep acceptor level. When a modified model is applied, the time that the depletion width in the bulk begins to diminish closely fits the time that the photopeak position begins to shift in radiation measurements. In this paper, we present a distribution of electric field during biasing and a simple method for the evaluation of the parameters of deep acceptors in CdTe bulk.

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Section: Introductionmentioning

confidence: 99%

Quantitative Analysis of Polarization Phenomena in CdTe Radiation Detectors

Toyama

Higa

Yamazato

et al. 2006

Jpn. J. Appl. Phys.

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“…Another application where energy information is used is the development of a bone densitometer with a linear CdTe array [87]. In this system two thresholds, each connected to a 16-bit counter, are available.…”

Section: Bone Densitometry With Cdte Arraysmentioning

confidence: 99%

Development of segmented semiconductor arrays for quantum imaging

Mikulec

2003

Nuclear Instruments and Methods in Physics Research Section A:

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The field of pixel detectors has grown strongly in recent years through progress in CMOS technology, which permits many hundreds of transistors to be implemented in a square area with a side of 50- This paper gives an introduction into the concept of quantum imaging using direct conversion in segmented semiconductor arrays. An overview of projects from this domain using strip, pad and in particular hybrid pixel detectors will be presented. One of these projects, the Medipix project, is described in more detail. The effect of different correction methods like threshold adjustment and flat field correction is illustrated and new measurement results and images presented.

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“…Nonetheless, a recent article (Schlomka et al 2008) suggests that energy discriminating detectors such as a 1024 pixel CdTe array with more than two energy bins are feasible for 'pre-clinical' quantitative CT tomographic imaging with possible new medical applications including the ability to discriminate among high-Z materials such as calcium hydroxyapatite (bone mineral), PMMA for simulating fat and soft tissue, and water in phantoms, at energies of 25-60 keV, which are relevant to the current paper. Significant progress is being made in applications of CdTe (or CdZnTe) detector arrays to medicine (Baba et al 2001, Le et al 2010and Iwanczyk et al 2009.…”

Section: Introductionmentioning

confidence: 99%

Bone densitometry using x-ray spectra

2010

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In contrast to the two distinct energy regions that are involved in dual-energy x-ray absorptiometry for bone densitometry, the complete spectrum of a beam transmitted through two layers of different materials is utilized in this study to calculate the areal density of each material. Test objects constructed from aluminum and Plexiglas were used to simulate cortical bone and soft tissue, respectively. Solid-state HPGe (high-purity germanium) detectors provided high-resolution x-ray spectra over an energy range of approximately 20-80 keV. Areal densities were obtained from spectra using two methods: a system of equations for two spectral regions and a nonlinear fit of the entire spectrum. Good agreement with the known areal densities of aluminum was obtained over a wide range of PMMA thicknesses. The spectral method presented here can be used to decrease beam hardening at a small number of bodily points selected for examination.

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Recent development of radiation measurement instrument for industrial and medical applications

Cited by 10 publications

References 4 publications

Quantitative Analysis of Polarization Phenomena in CdTe Radiation Detectors

Quantitative Analysis of Polarization Phenomena in CdTe Radiation Detectors

Development of segmented semiconductor arrays for quantum imaging

Bone densitometry using x-ray spectra

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