Hajir Al Hamrashdi
Many fields in the nuclear industry utilise imaging systems that only detect a single type of particles, i.e. neutrons or gammas. However, there are many instances where it is recommended or even necessary to detect neutrons and gammas simultaneously. In these instances, a dual-particle imaging system can offer a practical solution.
There is often a trade-off between efficiency and spatial resolution in existing dual-particle imaging systems, which often limits the efficacy of these systems in real applications. This PhD study aims to design a neutron-gamma imaging system that combines two existing imaging techniques: Compton camera and coded aperture camera. The combining of these is expected to boost the performance of conventional dual particle imaging systems, and at the same time overcome the low efficiency and/or poor resolution problems.
The main goal of this proof-of-concept study is to design a system that is capable of detecting simultaneously neutron and gamma ray sources with high efficiency and high spatial resolution. The provisional design is based on three layers of scintillation detectors.
The plan is to complete this proof-of-concept design through three main stages. The first stage will be devoted in studying each layer individually, that is to test different scintillation materials and different material thicknesses. In the second stage, an optimum three-layer design will be investigated. Finally, the design will be experimentally tested. Once the third stage is complete, the effect of data reconstruction methods on the image quality will be studied.
By the end of this PhD project, we hope the study will prove the feasibility of constructing a transportable dual-particle imaging system that can be used in a wide range of applications.