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Comparison of energy resolution spectra of CdTe TIMEPIX detector working in photon counting and time-over-threshold mode
Mid Sweden University, Faculty of Science, Technology and Media, Department of Electronics Design.ORCID iD: 0000-0002-5619-409X
2013 (English)In: IEEE Nuclear Science Symposium Conference Record, 2013, p. Art. no. 6829825-Conference paper, Published paper (Other academic)
Abstract [en]

Hybrid pixel detectors like the Medipix andTIMEPIX developed by the Medipix collaboration combinedwith high-z materials are of growing interest. In particular theTIMEPIX detector can be operated in photon counting mode andtime-over-threshold mode (ToT) to obtain spectral information.Previous studies showed that 110 μm pixel sizes obtain a betterenergy resolution than 55 μm pixel sizes. Furthermore, thresholdscans obtained a better spectral resolution than operation in ToTmode. In this work the influence of noise sources in differentmeasurement approaches on the spectral response of a TIMEPIXchip bump-bonded to CdTe sensor are presented. Two 1mmthick CdTe sensors with pixel sizes of 55 μm and 110 μm,bump-bonded to a TIMEPIX readout chip, were evaluated atthe Diamond Light Source synchrotron. A finely collimated,perpendicular pencil beam with x-ray energies of 25 keV and79 keV was used to investigate single pixels. A small area of 10x10pixels was investigated in ToT-mode and compared to a thresholdscan of the same pixels on both detectors. The measurementsare compared to an analytical SPICE/Python simulation thatemulates photon counting and time-over-threshold mode.

Place, publisher, year, edition, pages
2013. p. Art. no. 6829825-
National Category
Accelerator Physics and Instrumentation
Identifiers
URN: urn:nbn:se:miun:diva-20809DOI: 10.1109/NSSMIC.2013.6829825ISI: 000347163503197Scopus ID: 2-s2.0-84904169444Local ID: STCOAI: oai:DiVA.org:miun-20809DiVA, id: diva2:681096
Conference
2013 60th IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2013; Seoul; South Korea; 27 October 2013 through 2 November 2013; Category numberCFP13NSS-ART; Code 106171
Available from: 2013-12-19 Created: 2013-12-19 Last updated: 2016-10-20Bibliographically approved

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Krapohl, David

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CiteExportLink to record
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Citation style
  • apa
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  • asciidoc
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