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

Schößler, S.; Bromberger, B.; Brandis, Michal; Schmidt, L. Ph. H.; Tittelmeier, K.; Czasch, A.; Dangendorf, V.; Jagutzki, O.

doi:10.1088/1748-0221/7/02/c02048

Cited by 9 publications

(3 citation statements)

References 14 publications

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“…The charge cloud footprint typically has a diameter of a few mm, i.e., larger than the delay line wire pitch. 46 If the charge cloud is spread out over several discrete pick-up structures, it is possible to achieve a position resolution which is not limited by the pitch or width of the delay line-only by the time resolution of the electronics, provided there is sufficient gain from the MCP. 44 …”

Section: A Mcp Pmt With Position Readout Via Delay-linesmentioning

confidence: 99%

A wide-field TCSPC FLIM system based on an MCP PMT with a delay-line anode

Becker

Hirvonen

Milnes

et al. 2016

Review of Scientific Instruments

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We report on the implementation of a wide-field time-correlated single photon counting (TCSPC) method for fluorescence lifetime imaging (FLIM). It is based on a 40 mm diameter crossed delay line anode detector, where the readout is performed by three standard TCSPC boards. Excitation is performed by a picosecond diode laser with 50 MHz repetition rate. The photon arrival timing is obtained directly from the microchannel plates, with an instrumental response of ∼190 to 230 ps full width at half maximum depending on the position on the photocathode. The position of the photon event is obtained from the pulse propagation time along the two delay lines, one in x and one in y. One end of a delay line is fed into the “start” input of the corresponding TCSPC board, and the other end is delayed by 40 ns and fed into the “stop” input. The time between start and stop is directly converted into position, with a resolution of 200–250 μm. The data acquisition software builds up the distribution of the photons over their spatial coordinates, x and y, and their times after the excitation pulses, typically into 512 × 512 pixels and 1024 time channels per pixel. We apply the system to fluorescence lifetime imaging of cells labelled with Alexa 488 phalloidin in an epi-fluorescence microscope and discuss the application of our approach to other fluorescence microscopy methods.

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Section: A Mcp Pmt With Position Readout Via Delay-linesmentioning

confidence: 99%

A wide-field TCSPC FLIM system based on an MCP PMT with a delay-line anode

Becker

Hirvonen

Milnes

et al. 2016

Review of Scientific Instruments

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“…An inspection system featuring both FNRR and DDEG techniques will combine the capability of low-Z objects detection and substance-identification with high-Z selectivity. A Time-Resolved-Event-Counting-Optical-Radiation (TRECOR) detection system which combines imaging and energy spectroscopy of both fast neutrons and high-energy gamma-rays was developed in recent years by the ACCIS project (Automatic Cargo container screening system) of the German-Israeli Science and Technology (GIST) collaboration [6][7][8]. TRECOR utilizes plastic scintillator and LYSO crystals for the respective imaging of fast neutrons and gamma-rays.…”

Section: Jinst 10 P03030mentioning

confidence: 99%

A comprehensive simulation study of a Liquid-Xe detector for contraband detection

Israelashvili¹,

Cortesi²,

Vartsky³

et al. 2015

J. Inst.

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Recently, a new detector concept, for combined imaging and spectroscopy of fast-neutrons and gamma was presented. It encompasses a liquid-xenon (LXe) converter-scintillator coupled to a UV-sensitive gaseous Thick Gas Electron Multiplier (THGEM)-based imaging photomultiplier (GPM).In this work we present and discuss the results of a systematic computer-simulation study aiming at optimizing the type and performance of LXe converter. We have evaluated the detector spectral response, detection efficiency and spatial resolution for gamma-rays and neutrons in the energy range of 2-15 MeV for 50 mm thick converters consisting of plain LXe volume and LXe-filled capillaries, of Teflon, Polyethylene or hydrogen-containing Teflon (Tefzel). Neutron detection efficiencies for plain LXe, Teflon-capillaries and Tefzel-capillaries converters were about 20% over the entire energy range. In polyethylene capillaries converters the neutron detection efficiency was about 10% at 2 MeV and increased up to about 20% at 14 MeV. Detection efficiencies of gammas in Teflon, Tefzel and polyethylene converters were ~35%. The plain-LXe converter provided the highest gamma-ray detection efficiency, of ~40-50% for 2-15 MeV energy range. Optimization of LXe-filled Tefzel capillary dimensions resulted in spatial resolution of ~1.5mm (FWHM) for neutrons and up to 3.5 mm (FWHM) for gamma-rays.Simulations of radiographic images of various materials using two discrete energy gammarays (4.4 MeV and 15.1 MeV) and neutrons in broad energy range (2-10 MeV) were performed in order to evaluate the potential of elemental discrimination.

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“…In TRECOR the CCD camera is replaced by a pulse counting image intensifi er [20], capable of individually detecting each neutrons position and ToF. Energy dependent image acquisition is obtained on single event basis.…”

Section: Fast Neutron Imaging Detectorsmentioning

confidence: 99%