PROBLEM TO BE SOLVED: To obtain two radiographic images through one-time irradiation with radial rays while reducing a thickness.SOLUTION: A radiation detector is configured by stacking a scintillator layer 24 and an organic photoelectric conversion layer 30 in an incident direction of radial rays X. In the scintillator layer 24, a first fluorescent material 26 and a second fluorescent material 28 are mixed. The first fluorescent material 26 is induced mainly to low-energy radial rays X1 and converts the radial rays X into light 26A of a first wavelength, and the second fluorescent material 28 is induced mainly to high-energy radial rays X and converts the radial rays X into light 28A of a second wavelength whose peak is different from the first wavelength. In the organic photoelectric conversion layer 30, a plurality of first photodetection sensors 40 and second photodetection sensors 42 are disposed within the same plane. Each of the first photodetection sensors 40 is comprised of an organic material, absorbs the light 26A of the first wavelength more than the light 28A of the second wavelength, and converts the absorbed light into an electric charge Q1. Each of the second photodetection sensors 42 is comprised of an organic material different from that of the first photodetection sensors 40, absorbs the light 28A of the second wavelength more than the light 26A of the first wavelength, and converts the absorbed light into an electric charge Q2.COPYRIGHT: (C)2012,JPO&INPIT【課題】厚みが薄く、放射線の1回照射で2つの放射線画像を得ることができる。【解決手段】主に低エネルギーの放射線X1に感応し、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、主に高エネルギーの放射線Xに感応し、放射線Xをピークが第1波長と異なる第2波長の光28Aに変換する第2蛍光材料28とが混合されたシンチレータ層24と、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光検出センサ40と、前記有機材料とは異なる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光検出センサ42と、が同一面内に複数配置された有機光電変換層30と、を放射線Xの入射方向に積層して構成した。【選択図】図8
