Simulation of a gamma-ray imaging technique using detector response patterns

Abstract

We introduce a novel gamma-ray imaging technique that uses detector response patterns. This method employs multiple shielding cubes randomly positioned in a three-dimensional configuration. Within the volume defined by these cubes, a unique gamma-ray flux pattern is formed based on the incidence direction of the gamma rays. This pattern can be measured using the responses of several scintillator cubes. By pre-measuring the detector response pattern and incidence direction of the gamma rays, the incidence direction can be estimated using an unfolding technique. Simulations were performed using a 137Cs point source. Our results show that a 10 MBq 137Cs source, located 3 m away from the imager, can be imaged with an angular resolution close to 10°. These findings suggest that our new method is comparable to existing gamma-ray imaging techniques. Potential applications of this imaging method include nuclear power plant decommissioning, nuclear medicine, security, and astronomy.

An experimental feasibility study of a 4π gamma-ray imager using detector response patterns

“…This false image has also been observed in a simulation. 34) Figure 11 shows the line profiles in the θ and f cross-sections of configurations 1 and 2. The width of peaks 1 and 3 was 5°(1 pixel).…”

“…The details of the principle are described in previous research, 34) and we provide only a brief explanation here. Our proposed method can be seen as a 3D extension of the coded mask camera.…”

“…Compared to these conventional methods, our proposed approach simplifies the circuit and reconstruction algorithm, reducing development costs and enhancing system reliability. In previous simulations, 34) it has been demonstrated that combining eight Gd 3 Al 2 Ga 3 O 12 (GAGG) (Ce) scintillator cubes with 18 lead shielding cubes can achieve the 4π imaging of 137 Cs with an angular uncertainty of approximately 10°. This study aims to experimentally validate the simulation results by constructing a prototype gamma-ray imager and conducting a 4π imaging experiment using a 137 Cs source.…”