Feasibility study for a low-cost 3D gamma-ray camera

A novel gamma-ray camera is proposed based on Positron Annihilation Compton Scattering Imaging (PACSI). The camera comprises a positron source and a fast, position-sensitive gamma-ray detector. Monte Carlo simulations of the camera have demonstrated that it should be capable of forming 3-D images of objects that can only be viewed from one side. A simple 1-D PACSI camera has been constructed and tested in the laboratory. Prospects for the construction of a full 3-D prototype camera are discussed.