On the fabrication and characterization of heterogeneous composite neutron detectors with triple-pulse-shape-discrimination capability

Albert Foster, Amira Barhoumi Ep Meddeb, Marc Wonders, Marek Flaska, Manish Sharma, Zoubeida Ounaies, Igor Jovanovic

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Abstract

This paper describes the fabrication and characterization of a novel triple-pulse-shape-discrimination (PSD) capable heterogeneous composite neutron detector that utilizes fast neutron-sensitive scintillating polyvinyl toluene (PVT) and 6Li-glass rods. The objective of this study was twofold: 1) Assess the effect of PPO (primary dopant) loading on the mechanical properties of the PVT, and 2) fabricate a triple PSD-capable composite detector using PPO-doped PVT and 6Li-glass rods. Thermal and mechanical characterization reveals that, as the weight content of the PPO in PVT increases, the glass transition temperature (Tg) of the PVT decreases. This decrease in Tg leads to a mechanically soft polymer which is undesirable for machining and susceptible to damage and deformation. Therefore, a crosslinking agent (divinylbenzene, DVB) was introduced to control the mechanical properties while still exploiting the PSD capabilities of the high PPO content PVT. The composite was then fabricated using the crosslinked PVT as the fast neutron and gamma sensitive material and 6Li-glass rods as the thermal neutron sensitive material. The final fabricated composite sample has a glass weight content of 6% and dimensions of 2.5 cm x 2.5 cm. A UV/Vis spectrometer was used to characterize the optical properties of the composite sample. A 252Cf source was used to test the PSD capabilities and intrinsic efficiency of the sample. The figure of merit for the fast neutron and gamma rays was measured to be ∼1, while the thermal neutrons and gamma rays exhibit a figure of merit of ∼3. A 60Co source was used to measure the gamma rejection of the sample, which was found to be 10−5. The capture efficiency of the small prototype sample for unmoderated neutrons was measured to be 0.09%, closely matching the result of simulation (0.11%).

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Neutron detectors
neutron counters
Toluene
discrimination
toluene
Polyphenylene oxides
Neutrons
Fabrication
fabrication
composite materials
Composite materials
pulses
fast neutrons
Glass
rods
glass
thermal neutrons
figure of merit
Gamma rays
rays

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Instrumentation

Cite this

@article{ad3b5023f5224b119350a74e39542779,
title = "On the fabrication and characterization of heterogeneous composite neutron detectors with triple-pulse-shape-discrimination capability",
abstract = "This paper describes the fabrication and characterization of a novel triple-pulse-shape-discrimination (PSD) capable heterogeneous composite neutron detector that utilizes fast neutron-sensitive scintillating polyvinyl toluene (PVT) and 6Li-glass rods. The objective of this study was twofold: 1) Assess the effect of PPO (primary dopant) loading on the mechanical properties of the PVT, and 2) fabricate a triple PSD-capable composite detector using PPO-doped PVT and 6Li-glass rods. Thermal and mechanical characterization reveals that, as the weight content of the PPO in PVT increases, the glass transition temperature (Tg) of the PVT decreases. This decrease in Tg leads to a mechanically soft polymer which is undesirable for machining and susceptible to damage and deformation. Therefore, a crosslinking agent (divinylbenzene, DVB) was introduced to control the mechanical properties while still exploiting the PSD capabilities of the high PPO content PVT. The composite was then fabricated using the crosslinked PVT as the fast neutron and gamma sensitive material and 6Li-glass rods as the thermal neutron sensitive material. The final fabricated composite sample has a glass weight content of 6{\%} and dimensions of 2.5 cm x 2.5 cm. A UV/Vis spectrometer was used to characterize the optical properties of the composite sample. A 252Cf source was used to test the PSD capabilities and intrinsic efficiency of the sample. The figure of merit for the fast neutron and gamma rays was measured to be ∼1, while the thermal neutrons and gamma rays exhibit a figure of merit of ∼3. A 60Co source was used to measure the gamma rejection of the sample, which was found to be 10−5. The capture efficiency of the small prototype sample for unmoderated neutrons was measured to be 0.09{\%}, closely matching the result of simulation (0.11{\%}).",
author = "Albert Foster and {Barhoumi Ep Meddeb}, Amira and Marc Wonders and Marek Flaska and Manish Sharma and Zoubeida Ounaies and Igor Jovanovic",
year = "2018",
month = "1",
day = "1",
doi = "10.1016/j.nima.2018.11.140",
language = "English (US)",
journal = "Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment",
issn = "0168-9002",
publisher = "Elsevier",

}

TY - JOUR

T1 - On the fabrication and characterization of heterogeneous composite neutron detectors with triple-pulse-shape-discrimination capability

AU - Foster, Albert

AU - Barhoumi Ep Meddeb, Amira

AU - Wonders, Marc

AU - Flaska, Marek

AU - Sharma, Manish

AU - Ounaies, Zoubeida

AU - Jovanovic, Igor

PY - 2018/1/1

Y1 - 2018/1/1

N2 - This paper describes the fabrication and characterization of a novel triple-pulse-shape-discrimination (PSD) capable heterogeneous composite neutron detector that utilizes fast neutron-sensitive scintillating polyvinyl toluene (PVT) and 6Li-glass rods. The objective of this study was twofold: 1) Assess the effect of PPO (primary dopant) loading on the mechanical properties of the PVT, and 2) fabricate a triple PSD-capable composite detector using PPO-doped PVT and 6Li-glass rods. Thermal and mechanical characterization reveals that, as the weight content of the PPO in PVT increases, the glass transition temperature (Tg) of the PVT decreases. This decrease in Tg leads to a mechanically soft polymer which is undesirable for machining and susceptible to damage and deformation. Therefore, a crosslinking agent (divinylbenzene, DVB) was introduced to control the mechanical properties while still exploiting the PSD capabilities of the high PPO content PVT. The composite was then fabricated using the crosslinked PVT as the fast neutron and gamma sensitive material and 6Li-glass rods as the thermal neutron sensitive material. The final fabricated composite sample has a glass weight content of 6% and dimensions of 2.5 cm x 2.5 cm. A UV/Vis spectrometer was used to characterize the optical properties of the composite sample. A 252Cf source was used to test the PSD capabilities and intrinsic efficiency of the sample. The figure of merit for the fast neutron and gamma rays was measured to be ∼1, while the thermal neutrons and gamma rays exhibit a figure of merit of ∼3. A 60Co source was used to measure the gamma rejection of the sample, which was found to be 10−5. The capture efficiency of the small prototype sample for unmoderated neutrons was measured to be 0.09%, closely matching the result of simulation (0.11%).

AB - This paper describes the fabrication and characterization of a novel triple-pulse-shape-discrimination (PSD) capable heterogeneous composite neutron detector that utilizes fast neutron-sensitive scintillating polyvinyl toluene (PVT) and 6Li-glass rods. The objective of this study was twofold: 1) Assess the effect of PPO (primary dopant) loading on the mechanical properties of the PVT, and 2) fabricate a triple PSD-capable composite detector using PPO-doped PVT and 6Li-glass rods. Thermal and mechanical characterization reveals that, as the weight content of the PPO in PVT increases, the glass transition temperature (Tg) of the PVT decreases. This decrease in Tg leads to a mechanically soft polymer which is undesirable for machining and susceptible to damage and deformation. Therefore, a crosslinking agent (divinylbenzene, DVB) was introduced to control the mechanical properties while still exploiting the PSD capabilities of the high PPO content PVT. The composite was then fabricated using the crosslinked PVT as the fast neutron and gamma sensitive material and 6Li-glass rods as the thermal neutron sensitive material. The final fabricated composite sample has a glass weight content of 6% and dimensions of 2.5 cm x 2.5 cm. A UV/Vis spectrometer was used to characterize the optical properties of the composite sample. A 252Cf source was used to test the PSD capabilities and intrinsic efficiency of the sample. The figure of merit for the fast neutron and gamma rays was measured to be ∼1, while the thermal neutrons and gamma rays exhibit a figure of merit of ∼3. A 60Co source was used to measure the gamma rejection of the sample, which was found to be 10−5. The capture efficiency of the small prototype sample for unmoderated neutrons was measured to be 0.09%, closely matching the result of simulation (0.11%).

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U2 - 10.1016/j.nima.2018.11.140

DO - 10.1016/j.nima.2018.11.140

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JO - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

JF - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

SN - 0168-9002

ER -