کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10716132 | 1027535 | 2005 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Near room temperature X-ray and γ-ray spectroscopic detectors for future space experiments
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
ابزار دقیق
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
New generation Cadmium Telluride (CZT and CdTe) solid-state detectors can provide high quantum efficiency with reasonably good energy resolution and can operate at near room temperature; a unique advantage for space experiments. We present here results of our study of small diode detectors as well as large area pixel detectors. Our study is aimed at developing near room temperature hard X-ray spectroscopy detectors for ASTROSAT and other future Indian space science missions. We have studied a Si-PIN detector in the energy range 5-60 keV and CZT and CdTe Schottky diode detectors in the energy region 10-1330 keV. Our results suggest that the energy resolution is limited by the thermal/electronic noise in the low-energy region (⩽60keV) while it is affected by the charge transport properties of the detector in the higher energy region (⩾100keV). We have studied large area (64cm2) CZT pixel detectors with pixel size close to the small CZT detector. We have studied individual pixels as well as CZT detector as a whole (summed over all the 1024 pixels). The CZT pixel detectors are single carrier detectors with peaking time ⩽1μs. The energy resolution behaviour of the large area CZT detector is similar to that of small diode detectors in the low-energy region. The change in operating temperature from room temperature â¼20 to â¼70âC drastically affects both the energy resolution as well as the peak area due to a sharp rise in the thermal noise. These results suggest that the cooling of detector system will provide better energy resolution as well as detection efficiency. Our results also show that the crystal uniformity is another important issue in the case of large area CZT pixel detectors.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment - Volume 552, Issue 3, 1 November 2005, Pages 399-408
Journal: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment - Volume 552, Issue 3, 1 November 2005, Pages 399-408
نویسندگان
J.S. Yadav, S. Savitri, J.P. Malkar,