High resolution, high efficiency liquid scintillator capillary array for gamma imaging

Abstract

We fabricated a liquid scintillator capillary array (LSCA) for gamma imaging with the aim of developing a one-dimensional detector system utilizing a streak camera for high temporal and spatial resolution pulsed gamma radiation detection. The detector's performance was studied in a simulation and via an experiment. The maximum efficiency of the LSCA's emission was at a wavelength of 420 nm. To establish a high fidelity representation of the detector's edge spread function and modulation transfer function (MTF), a slanted edge algorithm was introduced to calculate the edge spread function of the discrete sampling array's image screen. The simulation results showed that the spatial resolution of the LSCA was better for 14 MeV neutrons than for 1.25 MeV gamma radiation. The experimental results show that in comparison with a 6-mm-thick LaBr image plate, the LSCA had a higher temporal and spatial resolution when used as a gamma detector. The spatial resolution was 1.1 lp/mm (MTF = 0.1) for the LSCA. In addition, when an ultra-violet streak camera was coupled with the LSCA, it had a comparable sensitivity to that of a 6-mm-thick LaBr image plate.

Experimental Demonstration of a Tunable Energy-Selective Gamma-Ray Imaging System Based on Recoil Electrons

“…A novel imaging system has been introduced for gamma-ray energy-selective imaging predicated on the detection of recoil electrons [18], as illustrated in Figure 2a. This system is constructed around three integral components:…”

“…A novel imaging system has been introduced for gamma-ray energy-selective imaging predicated on the detection of recoil electrons [ 18 ], as illustrated in Figure 2 a. This system is constructed around three integral components: Radiation Conversion Target, which utilizes a Beryllium foil to facilitate the interaction between gamma rays and electrons, thereby generating recoil electrons; Achromatic Point-to-Point Imaging Structure, featuring an odd-symmetric configuration of two dipole electromagnetic coils designed to accurately image recoil electrons across a spectrum of divergence angles and energy distributions, while also correcting for chromatic aberrations to maintain imaging clarity and precision; Image Plate, which is responsible for capturing and recording the spatial distribution of electron positions, subsequently transforming this information into image data for further analysis and processing.…”