Patent ID: 6570160
Filing Date: 2003-05-27
Classification: G01T

Abstract:
A radiation detecting apparatus comprising:a light shielding film for transmitting therethrough first and second radiation rays while shielding out other light; a first scintillator for emitting a first light in response to the first radiation ray transmitted through the light shielding film, said first scintillator emitting the first light having a first emission center wavelength determined based on the first radiation ray, wherein the first emission center wavelength is a wavelength of the first light emitted in the first scintillator and having a peak emission intensity in an emission wavelength band of the first scintillator; a second scintillator for emitting a second light in response to the second radiation ray transmitted through the light shielding film, said second scintillator emitting the second light having a second emission center wavelength that is different than said first emission center wavelength and is determined based on the second radiation ray, wherein the second emission center wavelength is a wavelength of the second light emitted in the second scintillator and having a peak emission intensity in an emission wavelength band of the second scintillator; and detection means having at least one photo-detector for detecting the first light emitted from the first scintillator and the second light emitted in the second scintillator, wherein said second scintillator has an incident surface on which the first and second radiations are incident and a back surface opposite to the incident surface, said detection means comprises first and second photo-detectors each having a sensitive surface sensitive to each of the first and second lights; a first filter mounted on the sensitive surface of the first photo-detector; and a second filter mounted on the sensitive surface of the second photo-detector, said first filter being adapted to transmit therethrough only the fist light emitted from the first scintillator, said second filter being adapted to transmit therethrough only the second light emitted in the second scintillator, and wherein said first filter is arranged to be away from the back surface of the second scintillator at a predetermined interval so that an air layer is interposed between the back surface of the second scintillator and the first filter, and said second filter is closely optically adhered on the back surface of the second scintillator.