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Imaging and spectroscopic performance studies of pixellated CdTe Timepix detector
School of Physics and Astronomy, University of Glasgow, G12 8QQ, United Kingdom.
School of Physics and Astronomy, University of Glasgow, G12 8QQ, United Kingdom.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.ORCID iD: 0000-0002-8325-5177
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2012 (English)In: Journal of Instrumentation, ISSN 1748-0221, E-ISSN 1748-0221, Vol. 7, no 1, Art. no. C01038- p.Article in journal (Refereed) Published
Abstract [en]

In this work the results on imaging and spectroscopic performances of 14 × 14 × 1 mm CdTe detectors with 55 × 55Όm and 110 × 110Όm pixel pitch bump-bonded to a Timepix chip are presented. The performance of the 110 × 110Όm 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 20Όm 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 ΔE/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 × 110Όm pixel detector exhibited systematically better energy resolution in comparison to 55 × 55Όm. An imaging performance of 55 × 55Όm 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. © 2012 IOP Publishing Ltd and SISSA.

Place, publisher, year, edition, pages
2012. Vol. 7, no 1, Art. no. C01038- p.
Keyword [en]
Gamma detectors (scintillators, CZT, HPG, HgI etc); Hybrid detectors; Instrumentation for synchrotron radiation accelerators
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:miun:diva-16747DOI: 10.1088/1748-0221/7/01/C01038ISI: 000303806200038Scopus ID: 2-s2.0-84857025847Local ID: STCOAI: oai:DiVA.org:miun-16747DiVA: diva2:545346
Available from: 2012-08-20 Created: 2012-08-17 Last updated: 2016-10-20Bibliographically approved
In thesis
1. Hybrid pixel detectors: Characterization and optimization
Open this publication in new window or tab >>Hybrid pixel detectors: Characterization and optimization
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Sundsvall: Mid Sweden University, 2015. 209 p.
Series
Mid Sweden University doctoral thesis, ISSN 1652-893X ; 228
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:miun:diva-26794 (URN)STC (Local ID)978-91-88025-37-1 (ISBN)STC (Archive number)STC (OAI)
Public defence
2015-09-08, 13:00
Supervisors
Available from: 2016-01-04 Created: 2016-01-04 Last updated: 2016-12-23Bibliographically approved

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CiteExportLink to record
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