Pattern recognition of tracks induced by individual quanta of ionizing radiation in Medipix2 silicon detector

Holý, T.; Heijne, E.H.M.; Jakůbek, J.; Pospı́šil, S.; Uher, J.; Vykydal, Z.

doi:10.1016/j.nima.2008.03.074

Cited by 98 publications

(67 citation statements)

References 5 publications

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“…The Timepix can be thought of as a digital camera for the radiation environment, allowing one to take energy-resolved snapshots, called frames Campbell et al, 2008aCampbell et al, , 2008bHoly et al, 2008;Jakubek et al, 2008;Vilalta et al, 2011). To obtain as much information as possible, the overlap of tracks from particles, which each form clusters of pixels in the frame images, should be minimized.…”

Section: Data Processingmentioning

confidence: 99%

A semiconductor radiation imaging pixel detector for space radiation dosimetry

Kroupa

Bahadori

Campbell-Ricketts

et al. 2015

Life Sciences in Space Research

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Section: Data Processingmentioning

confidence: 99%

A semiconductor radiation imaging pixel detector for space radiation dosimetry

Kroupa

Bahadori

Campbell-Ricketts

et al. 2015

Life Sciences in Space Research

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“…The separation of the radiation background signal from the neutron signal was done using the so-called single event analysis, 11 performed by custom made plugin of the Pixelman software. 12 The single event analysis evaluates track shape (cluster of active pixels) and/or its energy profile of each recorded particle (event).…”

Section: Single Event Analysismentioning

confidence: 99%

“…Spectroscopic properties of the "detector-converter arrangement" and the spatial resolution of position sensitive detection improve with decreasing converter thickness. 10,11 A very thin converter was chosen since particle recognition is fundamental for this work apart from the low detection efficiency.…”

Section: Introductionmentioning

confidence: 99%

Position sensitive detection of neutrons in high radiation background field

Vavřı́k

Jakůbek

Pospı́šil

et al. 2014

Review of Scientific Instruments

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We present the development of a high-resolution position sensitive device for detection of slow neutrons in the environment of extremely high γ and e− radiation background. We make use of a planar silicon pixelated (pixel size: 55 × 55 μm2) spectroscopic Timepix detector adapted for neutron detection utilizing very thin 10B converter placed onto detector surface. We demonstrate that electromagnetic radiation background can be discriminated from the neutron signal utilizing the fact that each particle type produces characteristic ionization tracks in the pixelated detector. Particular tracks can be distinguished by their 2D shape (in the detector plane) and spectroscopic response using single event analysis. A Cd sheet served as thermal neutron stopper as well as intensive source of gamma rays and energetic electrons. Highly efficient discrimination was successful even at very low neutron to electromagnetic background ratio about 10−4.

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“…Particle types are recognised based on cluster morphology (Holy, 2008). Beta particles usually have a cluster of pixel hits that appears as a long, curly track, or as single, double, triple and quadruple hits (Fig.…”

Section: Timepix Measurementmentioning

confidence: 99%

Deriving spatially resolved beta dose rates in sediment using the Timepix pixelated detector

Romanyukha

Cunningham

George

et al. 2017

Radiation Measurements

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Luminescence dating methods currently allow for the evaluation of the distribution of equivalent dose (D e ) values for individual sand-sized grains of quartz and feldspar from a given sample, but the environmental dose rate is still derived from the bulk sample. Additionally, single-grain optically stimulated luminescence (OSL) dating is performed on disaggregated samples, resulting in the loss of micro-stratigraphic context. To enhance the interpretation of D e distributions, we aim to estimate the beta dose rate to sub-millimetre regions of intact samples using the Timepix pixelated semiconductor detector. The Timepix contains an array of 256 × 256 pixels, each 55 × 55 μm in size and with its own preamplifier, discriminator and digital counter. The detector has a total sensitive area of 1.98 cm 2 , and 65,536 independent channels. The output of each measurement is a matrix containing the position and pixel-by-pixel count rate (or deposited energy) of each particle that interacted in the sensitive volume of the detector. The main challenge in using the Timepix detector is low natural sample activity, and the goal of this work is to acquire data with minimal background contribution. With an experimental setup guided by Geant4 simulations, progress has been made to greatly reduce background noise using ad hoc shielding and post-acquisition particle analysis. We have established a Timepix measurement procedure applicable to resin-impregnated sediment samples, including sample preparation, measurement, and data processing and analysis. These steps have been tested on an artificial micro-stratified sample (composed of quartz and biotite grains held together by resin) to derive the corresponding spatially resolved beta dose rates. Disciplines Engineering | Science and Technology Studies Publication DetailsRomanyukha, A. A., Cunningham, A. C., George, S. P., Guatelli, S., Petasecca, M., Rosenfeld, A. B. & Roberts, R. G. (2017). Deriving spatially resolved beta dose rates in sediment using the Timepix pixelated detector. Highlights• Timepix detector used to map beta dose rates in sediment • Geant4 simulations used to design measurement procedure • Method tested on an artificial micro-stratified sample • We show that natural dose rates can be mapped at sub-millimetre scales Abstract Luminescence dating methods currently allow for the evaluation of the distribution of equivalent dose (De) values for individual sand-sized grains of quartz and feldspar from a given sample, but the environmental dose rate is still derived from the bulk sample. Additionally, single-grain optically stimulated luminescence (OSL) dating is performed on disaggregated samples, resulting in the loss of micro-stratigraphic context. To enhance the interpretation of De distributions, we aim to estimate the beta dose rate to sub-millimetre regions of intact samples using the Timepix pixelated semiconductor detector. The Timepix contains an array of 256 x 256 pixels, each 55 x 55 μm in size and with its own preamplifier, discriminator and di...

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Pattern recognition of tracks induced by individual quanta of ionizing radiation in Medipix2 silicon detector

Cited by 98 publications

References 5 publications

A semiconductor radiation imaging pixel detector for space radiation dosimetry

A semiconductor radiation imaging pixel detector for space radiation dosimetry

Position sensitive detection of neutrons in high radiation background field

Deriving spatially resolved beta dose rates in sediment using the Timepix pixelated detector

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