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AbstractAbstract
[en] The MCP-based neutron counting detector is a novel device that allows high spatial resolution and time-resolved neutron radiography and tomography with epithermal, thermal and cold neutrons. Time resolution is possible by the high readout speeds of ∼ 1200 frames/sec, allowing high resolution event counting with relatively high rates without spatial resolution degradation due to event overlaps. The electronic readout is based on a Timepix sensor, a CMOS pixel readout chip developed at CERN. Currently, a geometry of a quad Timepix detector is used with an active format of 28 × 28 mm2 limited by the size of the Timepix quad (2 × 2 chips) readout. Measurements of a set of high-precision micrometers test samples have been performed at the Imaging and Materials Science and Engineering (IMAT) beamline operating at the ISIS spallation neutron source (U.K.). The aim of these experiments was the full characterization of the chip misalignment and of the gaps between each pad in the quad Timepix sensor. Such misalignment causes distortions of the recorded shape of the sample analyzed. We present in this work a post-processing image procedure that considers and corrects these effects. Results of the correction will be discussed and the efficacy of this method evaluated.
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Source
Available from http://dx.doi.org/10.1088/1748-0221/13/04/C04028; Country of input: International Atomic Energy Agency (IAEA)
Record Type
Journal Article
Journal
Journal of Instrumentation; ISSN 1748-0221;
; v. 13(04); p. C04028

Country of publication
ACCELERATOR NEUTRON SOURCE FACILITIES, BARYONS, CARBOXYLIC ACID SALTS, DIAGNOSTIC TECHNIQUES, ELEMENTARY PARTICLES, FERMIONS, HADRONS, INDUSTRIAL RADIOGRAPHY, INTERNATIONAL ORGANIZATIONS, MATERIALS TESTING, NEUTRON SOURCE FACILITIES, NEUTRONS, NONDESTRUCTIVE TESTING, NUCLEONS, PROCESSING, RESOLUTION, SPALLATION NEUTRON SOURCE FACILITIES, TESTING, TIMING PROPERTIES
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