Study of a Coincidence Detector Using a Suspension of Superheated Superconducting Grains in a High Density Dielectric Matrix for Positron Emission Tomography and γ−γγ−γ Tagging

We demonstrate the feasibility of coincidence detectors based on superheated superconducting grains (SSG) in a high density dielectric matrix (HDDM) for two applications: 1) positron cameras for small animal imaging, where two diametrically opposite cells are simultaneously hit by 511 keV gammas; 2) tagging of gamma - gamma events in electron positron colliders.