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Characterization of the Medipix3 pixel readout chip
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2011 (English)In: Journal of Instrumentation, ISSN 1748-0221, E-ISSN 1748-0221, Vol. 6, no 1Article in journal (Refereed) Published
Place, publisher, year, edition, pages
2011. Vol. 6, no 1
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:miun:diva-15826DOI: 10.1088/1748-0221/6/01/C01052OAI: oai:DiVA.org:miun-15826DiVA, id: diva2:488886
Note
The Medipix3 chip is a hybrid pixel detector readout chip working in Single Photon Counting Mode. It has been developed with a new front-end architecture aimed at eliminating the spectral distortion produced by charge diffusion in highly segmented semiconductor detectors. In the new architecture charge deposited in overlapping clusters of four pixels is summed event-by-event and the incoming quantum is assigned as a single hit to the summing circuit with the biggest charge deposit (this mode of operation is called Charge Summing Mode (CSM)). In Single Pixel Mode (SPM) the charge reconstruction and the communication between neighbouring pixels is disabled. This is the operating mode in traditional detector systems. This paper presents the results of the characterization of the chip with electrical stimuli and radioactive sources.Available from: 2012-02-02 Created: 2012-02-02 Last updated: 2017-12-08Bibliographically approved
In thesis
1. A Hybrid Pixel Detector ASIC with Energy Binning for Real-Time, Spectroscopic Dose Measurements
Open this publication in new window or tab >>A Hybrid Pixel Detector ASIC with Energy Binning for Real-Time, Spectroscopic Dose Measurements
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Hybrid pixel detectors have been demonstrated to provide excellent quality detection of ionising photon radiation, particularly in X-ray imaging. Recently, there has been interest in developing a hybrid pixel detector specifically for photon dosimetry. This thesis is on the design, implementation, and preliminary characterisation of the Dosepix readout chip.

Dosepix has 256 square pixels of 220 mm side-length, constituting 12.4 mm2 of photo-sensitive area per detector. The combination of multiple pixels provides many parallel processors with limited input flux, resulting in a radiation dose monitor which can continuously record data and provide a real-time report on personal dose equivalent. Energy measurements are obtained by measuring the time over threshold of each photon and a state machine in the pixel sorts the detected photon event into appropriate energy bins. Each pixel contains 16 digital thresholds with 16 registers to store the associated energy bins. Preliminary measurements of Dosepix chips bump bonded to silicon sensors show very promising results. The pixel has a frontend noise of 120 e-. In low power mode, each chip consumes 15 mW, permitting its use in a portable, battery-powered system. Direct time over threshold output from the hybrid pixel detector assembly reveal distinctive photo-peaks correctly identifying the nature of incident photons, and verification measurements indicate that the pixel binning state machines accurately categorise charge spectra. Personal dose equivalent reconstruction using this data has a flat response for a large range of photon energies and personal dose equivalent rates.

Place, publisher, year, edition, pages
Mid Sweden University, 2012. p. 238
Series
Mid Sweden University doctoral thesis, ISSN 1652-893X ; 128
Keywords
Hybrid pixel detector, low power readout chip, photon counting, time over threshold (ToT), energy binning, active personal dosimeter (APD)
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:miun:diva-16171 (URN)978-91-87103-20-9 (ISBN)
Public defence
2012-05-30, O102, Mittuniversitetet, Campus Sundsvall, Sundsvall, 13:00 (English)
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Supervisors
Available from: 2012-06-07 Created: 2012-05-03 Last updated: 2012-08-01Bibliographically approved

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Wong, Winnie

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