Testing of A Scintillating-Fiber Pet System

We are continuing the characterization of a PET module using plastic scintillating fibers coupled to position sensitive photomultipliers. The sensitivity in air and the resolution in air and water are tabulated for a source positioned at nine locations within the detector field of view. The full width half maximum resolution for a 0.5 mm diameter Na-22 source in air and water is approximately 2.5 m. The sensitivity is 19 c.p.s./(mu) Ci.