Patent ID: 8384034
Filing Date: 2013-02-26
Classification: G01T

Abstract:
1. A beta ray detector comprising: (a) an absorber scintillator disposed to face a subject emitting beta rays, and made from an organic material; (b) a backscattering scintillator made from an inorganic material exhibiting a low permeability and a high rate of backscattering as compared to the organic material; and (c) an energy detector combining the amounts of beta ray energy absorption simultaneously measured by the absorber scintillator and the backscattering scintillator to reconstruct the energy and the detection position of the beta rays emitted from the subject, wherein the energy detector comprises wherein the absorption light intensity detector and the backscattering light intensity detector are constructed by a plurality of light intensity detectors that are optically arranged at predetermined intervals on at least one of the side faces of the absorber scintillator and the backscattering scintillator, and wherein the calculator is arranged to calculate the incident positions of the beta rays from a light intensity distribution of the plurality of light intensity detectors.