A composite fast neutron detector module based on the 6Li(n,α) 3H reaction in 6Li-enriched GS20® scintillating glass has been engineered to be compact, robust, and tunable. The solid scintillating composite consists of only three components, all commercially sourced, and can be optically coupled to silicon photomultipliers (SiPMs) to create a highly capable and portable neutron detector module. The composite provides moderation of incident fast neutrons through an optically transparent organic matrix and achieves high gamma rejection by the use of small scintillating particles. The performance of the module was assessed by measurements of the die-away time and the sensitivity to both gammas and neutrons. Controlled scintillation light losses enable determination of the neutron capture location along the length of the cylindrical composite. Optical raytracing was used to predict the light-transport efficiencies and the longitudinal position dependency of scintillation events within the module. These assessments indicate that this module can be effective in the detection of nuclear material for nonproliferation, safeguards and security applications, and in fundamental and applied science.
Radiographic imaging represents a vital capability within non-destructive assessment, quality control and fundamental science. This study focuses on Gd2O2S:Tb3+ based scintillating composites incorporated into pixelated-metallic aperture screens, attached to amorphous silicon-based flat panels. Performance metrics are explored through coupled MCNP6- FRED simulations; here, scintillation light transport is investigated as a function of pixelated screen geometry and optical characteristics. For the first time, we demonstrate image acquisition with a 100 micron thick pixelated metallic aperture screen. The results demonstrate promising improvements to x-ray interaction rates while maintaining image quality.
Garnet based scintillators have been shown to have high light yield with fast scintillation decay constants. The availability of high refractive index resin enables the fabrication of translucent garnet based scintillating composites; here, this study investigates optical transport improvements through reducing the refractive index difference between composite constituents. The results of this study will demonstrate radiation response characteristics of garnet based scintillating composites, support hard-radiation imaging applications, basic science and explore optical transport limitations in composite technology.
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