Patent ID: 6515286
Filing Date: 2003-02-04
Classification: G01T

Abstract:
A radiation detector comprising:a scintillator which is made of CsI doped with Tl, receives radiation corresponding to a number X of radiation quantums for each of a plurality of pixels, and converts said radiation to fluorescent light so that a number L of photons which constitute the fluorescent light are emitted in response to each radiation quantum, and; a plurality of photoelectric conversion elements each of which is provided for one of said plurality of pixels, contains Si as a main component, detects said fluorescent light, and generates charges when said fluorescent light is detected, where each of said plurality of photoelectric conversion elements has a fill factor F and a photoelectric conversion efficiency &eegr;, and is arranged so that said fluorescent light enters said each of said plurality of photoelectric conversion elements with an entrance efficiency T; and a plurality of capacitor elements each of which is connected to one of said plurality of photoelectric conversion elements, stores said charges generated by said one of said plurality of photoelectric conversion elements, and has a maximum storable charge amount Q; wherein when said radiation detector receives a 10 to 300 mR dose of said radiation, said number X, said number L, said entrance efficiency T, said fill factor F, and said photoelectric conversion efficiency &eegr; satisfy a relationship XÂ·LÂ·TÂ·FÂ·&eegr;&lE;Q.