DocumentCode :
687371
Title :
Comparison of energy resolution spectra of CdTe TIMEPIX detector working in photon counting and time-over-threshold mode
Author :
Krapohl, D. ; Frojdh, C. ; Frojdh, Erik ; Gimenez, E.N. ; Maneuski, D. ; O´Shea, V. ; Tartoni, Nicola ; Thungstrom, Goran ; Wilhelm, H. ; Wraight, K.
Author_Institution :
Electron. Design Dept., Mid Sweden Univ., Sundsvall, Sweden
fYear :
2013
fDate :
Oct. 27 2013-Nov. 2 2013
Firstpage :
1
Lastpage :
4
Abstract :
Hybrid pixel detectors like the Medipix and TIMEPIX developed by the Medipix collaboration combined with high-z materials are of growing interest. In particular the TIMEPIX detector can be operated in photon counting mode and time-over-threshold mode (ToT) to obtain spectral information. Previous studies showed that 110 μm pixel sizes obtain a better energy resolution than 55 μm pixel sizes. Furthermore, threshold scans obtained a better spectral resolution than operation in ToT mode. In this work the influence of noise sources in different measurement approaches on the spectral response of a TIMEPIX chip bump-bonded to CdTe sensor are presented. Two 1mm thick CdTe sensors with pixel sizes of 55 μm and 110 μm, bump-bonded to a TIMEPIX readout chip, were evaluated at the Diamond Light Source synchrotron. A finely collimated, perpendicular pencil beam with x-ray energies of 25 keV and 79 keV was used to investigate single pixels. A small area of 10×10 pixels was investigated in ToT-mode and compared to a threshold scan of the same pixels on both detectors. The measurements are compared to an analytical SPICE/Python simulation that emulates photon counting and time-over-threshold mode.
Keywords :
noise; nuclear electronics; photon counting; readout electronics; semiconductor counters; CdTe; CdTe TIMEPIX detector; CdTe sensor; Diamond Light Source synchrotron; Medipix collaboration; TIMEPIX readout chip; ToT-mode; X-ray energies; analytical Python simulation; analytical SPICE simulation; energy resolution spectra; finely collimated perpendicular pencil beam; high-z materials; hybrid pixel detectors; measurement approaches; noise sources; photon counting mode; pixel sizes; size 1 mm; size 110 mum; size 55 mum; spectral information; spectral resolution; spectral response; threshold scans; time-over-threshold mode; Detectors; Diamonds; Energy measurement; Energy resolution; Light sources; Noise; Photonics;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC), 2013 IEEE
Conference_Location :
Seoul
Print_ISBN :
978-1-4799-0533-1
Type :
conf
DOI :
10.1109/NSSMIC.2013.6829825
Filename :
6829825
Link To Document :
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