PROBLEM TO BE SOLVED: To increase the amount of light received by a photoelectric conversion layer.SOLUTION: The radiation detector includes: a scintillator layer 24 formed into a single layer by mixing a first fluorescent material 26 for converting radiation X into light 26A of a first wavelength mainly in response to the radiation X of first energy, and a second fluorescent material 28 for converting radiation X into light 28A of a second wavelength mainly in response to radiation X2 of second energy a first photoelectric conversion layer 30 which is arranged in a side closer to an irradiation surface 300 of the radiation X than the scintillator layer 24, is constituted by a first organic material, absorbs more the light 26A of the first wavelength than the light 28A of the second wavelength, and converts the light into a charge Q1 and a second photoelectric conversion layer 34 which is constituted by a second organic material different from the first organic material, absorbs more the light 28A of the second wavelength than the light 26A of the first wavelength, and converts the light into a charge Q2.COPYRIGHT: (C)2012,JPO&INPIT【課題】光電変換層が受光する受光量を増す。【解決手段】主に第1エネルギーの放射線X1に感応して放射線Xを第1波長の光26Aに変換する第1蛍光材料26と、主に第2エネルギーの放射線X2に感応して放射線Xを第2波長の光28Aに変換する第2蛍光材料28とを混合して単層にして構成されたシンチレータ層24と、シンチレータ層24よりも放射線Xの照射面300側に配置されており、第1有機材料で構成され、第2波長の光28Aに比べ第1波長の光26Aを多く吸収して電荷Q1に変換する第1光電変換層30と、第1有機材料とは異なる第2有機材料で構成され、第1波長の光26Aに比べ第2波長の光28Aを多く吸収して電荷Q2に変換する第2光電変換層34と、を備える。【選択図】図8
