Patent ID: 7683336

Claim:
A gamma-ray spectrometer comprising a plastic scintillation body for receiving gamma-rays and creating photons therefrom, a photon detector optically coupled to the scintillation body so as to receive and detect the photons, and a reflective layer in planar contact with selected regions of the surface of the scintillation body so as to promote specular reflection of the photons from these selected regions, wherein the scintillation body is elongate and is substantially rectangular in cross section at positions along its length such that the surface of the scintillation body comprises two faces and two edges which are substantially parallel to the axis of extent, and two ends which are substantially perpendicular to the axis of extent, and wherein the photon detector is optically coupled to a one of the ends, and wherein the selected regions are the edges of the scintillation body, and do not comprise all of the surface of the scintillation body that is not coupled to the photon detector.