PROBLEM TO BE SOLVED: To provide a radiation detector that is thin in thickness and that obtains two radiation images from one-time radiation irradiation.SOLUTION: A radiation detector is constituted by laminating : a first scintillator layer 24 sensing largely a low-energy radiation X1 to convert a radiation X into a light 26A with a first wavelength a second scintillator layer 25 sensing a high-energy radiation X2 rather than the low-energy radiation to convert the radiation X into a light 28A with a second wavelength different from the first wavelength and an organic photoelectric conversion layer 30 in which a plurality of first light detection sensors 40 constituted of organic materials and absorbing the light 26A with the first wavelength a lot compared to the light 28A with the second wavelength to convert into charges and a plurality of second light detection sensors 42 constituted of organic materials different from said organic materials and absorbing the light 28A with the second wavelength a lot compared to the light 26A with the first wavelength to convert into charges are arranged within the same plane, in the incident direction of the radiation X.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。【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シンチレータ層24と、主に前記低エネルギーよりも高エネルギーの放射線X2に感応し、放射線Xを第1波長と異なる第2波長の光28Aに変換する第2シンチレータ層25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に変換する第1光検出センサ40と、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する。【選択図】図8
