Detectors of fast neutrons based on semi-insulating GaAs with neutron converter layers

Šagátová-Perd’ochová, Andrea; Dubecký, F.; Затько, Б.; Chodák, Ivan; Ladziansky, M.; Nečas, Vladimı́r

doi:10.1016/j.nima.2007.01.120

Cited by 13 publications

(3 citation statements)

References 8 publications

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“…Detectors based on bulk semi-insulating (SI) GaAs are promising due to high radiation resistance, good detection characteristics and low cost [12][13][14]. The main drawback of these devices is the high sensitivity to γ-rays, therefore γ-background radiation shielding [12,14] or using of such detectors at partial depletion mode [7] are required.…”

Section: Introductionmentioning

confidence: 99%

Fast neutron detector based on surface-barrier VPE GaAs structures

Черных

Didenko

et al. 2015

J. Inst.

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Surface-barrier structures based on thin high-purity GaAs epilayers with a polyethylene converter were studied as fast neutron detectors. A continuous Schottky barrier with a large area of 5 × 5 mm 2 to the high-purity GaAs epilayers was fabricated using a Pt/TiN/Au metallization system. Results of measurement of electric parameters and α-particle spectra are presented. The fast neutron spectra from the 241 Am-Be source measured by the recoil proton method for various thicknesses of the polyethylene converter and various operating biases are shown as well. The proposed detectors have shown high neutron detection efficiency of 1.30 • 10 −3 puls./neutr. and an acceptable signal-to-background ratio (at level of 50) as well as the capability to operate efficiently without any external bias.

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Section: Introductionmentioning

confidence: 99%

Fast neutron detector based on surface-barrier VPE GaAs structures

Черных

Didenko

et al. 2015

J. Inst.

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“…The mentioned neutron detectors are mostly based on silicon. Bulk GaAs detectors proved to be effective devices for detection of high energy charged particles and photons with energies typically used in nuclear medicine [1] and also for fast or thermal neutrons, when coated by an appropriate converter layer [2,3]. Moreover, the relatively high resistance of bulk SI (semiinsulating) GaAs against high-energy photons [4] and neutrons [5] predestine this material as a prospective candidate suitable for neutron detector fabrication.…”

Section: Introductionmentioning

confidence: 99%

Semi-insulating GaAs detectors optimized for fast neutron detection

et al. 2013

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Semi-insulating (SI) GaAs detectors with a HDPE (High Density PolyEthylene) conversion layer were optimized for detection of fast neutrons (from 0.5 MeV to 12 MeV). Based on previous simulations of neutron transport in HDPE and SI GaAs carried out by the Monte Carlo radiation transport computer code MCNPX (Monte Carlo N-Particle eXtended, version 2.5.0) we used a SI GaAs wafer with a larger thickness of 270 µm. The area of a single AuZn Schottky contact was enlarged from 6.25 mm 2 to 7.36 mm 2 . Thanks to the pixel structure of the new metallization the breakdown voltage increased from 60 V to 280 V as deduced from the measured I −V characteristics. Various thicknesses of HDPE layers in the range from 100 µm to 2000 µm were used with SI GaAs detectors for neutron conversion. The measured relative detection efficiency for fast neutrons using SI GaAs detectors with various HDPE thicknesses varied from 0.07 to 0.12% at lower applied voltages, with a maximum for a 500 µm thick conversion layer.

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“…In the previous work we have studied fast neutron detectors based on SI GaAs coated by two types of hydrogen containing neutron conversion layers [11]. They were able to detect fast neutrons, however they performance was not satisfactory enough.…”

Section: Introductionmentioning

confidence: 99%

Detection of fast neutrons using detectors based on semi-insulating GaAs

et al. 2011

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Detectors with AuZn square Schottky contact of the area of 2.5 × 2.5 mm 2 were fabricated. On the back side, the whole area AuGeNi eutectic ohmic contact was evaporated. The thickness of the base material (semi-insulating GaAs) was 220 µm. The connection of 4 detectors in parallel was tested to get the detection area of 25 mm 2 . The 239 Pu-Be fast neutron source with energies between 0.5 and 12 MeV was used in experimental measurements. We have investigated the optimal thickness of HDPE (high-density polyethylene) conversion layer for fast neutron detection. The spectra of the neutrons were measured by detectors covered by HDPE converter of different thicknesses. The fast neutron detection efficiency proved experimentally was compared with results from simulations performed by MCNPX (Monte Carlo N-Particle eXtended) code.

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Detectors of fast neutrons based on semi-insulating GaAs with neutron converter layers

Cited by 13 publications

References 8 publications

Fast neutron detector based on surface-barrier VPE GaAs structures

Fast neutron detector based on surface-barrier VPE GaAs structures

Semi-insulating GaAs detectors optimized for fast neutron detection

Detection of fast neutrons using detectors based on semi-insulating GaAs

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