Siloxane-based 6LiF composites for flexible thermal neutron scintillation sensors with high efficiency: effects of 6LiF crystals size and dispersion homogeneity

TL;DR

This study develops flexible, high-efficiency thermal neutron detectors using siloxane-based composites with optimized 6LiF crystal size and dispersion, achieving performance comparable to commercial detectors with enhanced mechanical properties.

Contribution

It introduces a novel flexible detector design employing tailored siloxane binders and controlled 6LiF crystal size for improved neutron detection performance.

Findings

Flexible detectors with high neutron efficiency achieved

Crystal size and dispersion significantly affect detector performance

Performance comparable to commercial detectors with better robustness

Abstract

The production of flexible and robust thermal neutron detectors with improved properties as compared to the commercial ZnS:Ag based phosphors is here pursued, exploiting a siloxane binder, whose intrinsic properties as related to the chemical features of the functional groups and to the optical properties are investigated and tailored in correlation with the final performances of the detectors. Two different siloxanes either with pendant phenyl groups or with aliphatic groups have been used, the former being intrinsically fluorescent and with higher polarizability than the latter. Moreover, 6LiF crystals have been synthesized by co-precipitation method and the solvent/co-solvent ratio has been changed in order to tune the crystal size. Then, the size effect on the detector efficiency to thermal neutrons has been investigated as related to the energy loss of thermal neutron reaction products inside the crystal and the dispersion homogeneity of the crystals into the composite. To complete the characterization of the produced flexible detectors, the response to {\gamma}-rays has been measured and compared to a commercial detector. The careful choice of both the base resin and the 6LiF crystals size allows to produce flexible detector for thermal neutrons with performances comparable to the commercial standard and with higher mechanical robustness and stability.