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Imaging and spectroscopic performance studies of pixellated CdTe Timepix detector

DOI: 10.1088/1748-0221/7/01/C01038 DOI Help

Authors: D. Maneuski (University of Glasgow) , V. Astromskas (University of Glasgow) , E. Frojdh (Mid Sweden University) , C. Fröjdh (Mid Sweden University) , Eva Gimenez-navarro (Diamond Light Source) , Julien Marchal (Diamond Light Source) , V. O'shea (University of Glasgow) , G. Stewart (University of Glasgow) , Nicola Tartoni (Diamond Light Source) , Heribert Wilhelm (Diamond Light Source) , K. Wraight (University of Glasgow) , R. M. Zain (University of Glasgow)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Instrumentation , VOL 7 , PAGES C01038 - C01038

State: Published (Approved)
Published: January 2012

Open Access Open Access

Abstract: In this work the results on imaging and spectroscopic performances of 14 × 14 × 1 mm CdTe detectors with 55 × 55 ?m and 110 × 110 ?m pixel pitch bump-bonded to a Timepix chip are presented. The performance of the 110 × 110 ?m pixel detector was evaluated at the extreme conditions beam line I15 of the Diamond Light Source. The energy of X-rays was set between 25 and 77 keV. The beam was collimated through the edge slits to 20 ?m FWHM incident in the middle of the pixel. The detector was operated in the time-over-threshold mode, allowing direct energy measurement. Energy in the neighbouring pixels was summed for spectra reconstruction. Energy resolution at 77 keV was found to be ?E/E = 3.9%. Comparative imaging and energy resolution studies were carried out between two pixel size detectors with a fluorescence target X-ray tube and radioactive sources. The 110 × 110 ?m pixel detector exhibited systematically better energy resolution in comparison to 55 × 55 ?m. An imaging performance of 55 × 55 ?m pixellated CdTe detector was assessed using the Modulation Transfer Function (MTF) technique and compared to the larger pixel. A considerable degradation in MTF was observed for bias voltages below -300 V. Significant room for improvement of the detector performance was identified both for imaging and spectroscopy and is discussed.

Journal Keywords: Beams; Cadmium Tellurides; Cdte Semiconductor Detectors; Comparative Evaluations; Diamonds; Electric Potential; Energy Resolution; Fluorescence; Images; Kev Range 10-100; Light Sources; Performance; Spectroscopy; Transfer Functions; X Radiation; X-Ray Tubes

Subject Areas: Technique Development

Instruments: I15-Extreme Conditions

Added On: 18/01/2012 11:48

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