Time and position sensitive single photon detector for scintillator read-out

Journal of Instrumentation (Impact Factor: 1.4). 02/2012; 7(02):C02048. DOI: 10.1088/1748-0221/7/02/C02048
Source: arXiv


We have developed a photon counting detector system for combined neutron and γ radiography which can determine position, time and intensity of a secondary photon flash created by a high-energy particle or photon within a scintillator screen. The system is based on a micro-channel plate photomultiplier concept utilizing image charge coupling to a position- and time-sensitive read-out anode placed outside the vacuum tube in air, aided by a standard photomultiplier and very fast pulse-height analyzing electronics. Due to the low dead time of all system components it can cope with the high throughput demands of a proposed combined fast neutron and dual discrete energy γ radiography method (FNDDER). We show tests with different types of delay-line read-out anodes and present a novel pulse-height-to-time converter circuit with its potential to discriminate γ energies for the projected FNDDER devices for an automated cargo container inspection system (ACCIS).

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Available from: Benjamin Bromberger
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    • "The light is then bent by 90ůsing a bending mirror, positioned at an angle of 45˚relative to the incident neutron direction, towards a large collecting lens (F#=1). The light image is focused by the collecting lens onto the Event-Counting Image-Intensifier (ECII) (Schoessler et al, 2012) that registers the TOF and position for each event. Fig. 5 a) Schematic illustration of the light patch in the TRECOR detector (top view), b) photograph of TRECOR Further details on the TRECOR detector concept can be found in (Dangendorf et al. 2006, Brandis et al. 2012). "

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    ABSTRACT: The pulsed low energy positron system PLEPS at the Munich research reactor FRM-II is a user facility for depth resolved positron lifetime measurements. Besides positron lifetime measurements 2D-AMOC (Two Dimensional Age Momentum Correlation) experiments are also possible. 2D-AMOC provides in coincidence the lifetime of the positron and the longitudinal momentum distribution of the annihilated electron. It would be of great scientific concern to measure simultaneously the entire 3D-momentum distribution of the electron annihilating with the positron and the corresponding lifetime of the positron (4D-AMOC). To perform 4D-AMOC measurements a time and position resolving detector is required in coincidence with a pixelated Germanium detector. Therefore a time and spatially resolving detector is currently developed at our institute with envisaged time resolution of 100 ps (FWHM) and a spatial resolution of about 2.6 mm (FWHM) over an area of 12 cm2. First test measurements have been carried out with a 25 mm diameter MCP (Micro Channel Plate) image intensifier and with special delay-line anode readout for the spatial information. Up to now 178 ps (FWHM) time resolution and on average 3.4 mm (FWHM) position resolution have been achieved with BaF2 as scintillator material and a 60Co source.
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