PROBLEM TO BE SOLVED: To provide a radiation detector, X-ray CT (Computer Tomography) apparatus and a method of manufacturing the radiation detector wherein a compartment of a scintillator is accurately aligned with a collimator.SOLUTION: The radiation detector includes: a collimator plate a scintillator that generates fluorescence upon receipt of radiation and a plurality of photoelectric conversion elements for converting the fluorescence into an electric signal. The radiation detector further includes: a photoelectric conversion means disposed on a first major surface of the scintillator an optical reflection part for partitioning the scintillator for each of the photoelectric conversion elements and an aligning means that is disposed on a second major surface opposed to the first major surface of the scintillator so that the aligning means is opposed to the optical reflection part, and that aligns the position of the collimator plate with the position of a compartment of the scintillator.COPYRIGHT: (C)2010,JPO&INPIT【課題】本発明は、シンチレータの区画とコリメータとの位置を精度よく合わせることができる放射線検出器、X線CT装置、及び放射線検出器の製造方法を提供する。【解決手段】コリメータ板と、放射線を受けて蛍光を発するシンチレータと、前記蛍光を電気信号に変換する光電変換素子を複数有し、前記シンチレータの第1の主面に設けられた光電変換手段と、前記光電変換素子毎に前記シンチレータを区画する光反射部と、前記シンチレータの第1の主面と対向する第2の主面に、前記光反射部と対向させて設けられ、前記コリメータ板の位置を前記シンチレータの区画の位置に合わせる位置合わせ手段と、を備えたことを特徴とする放射線検出器が提供される。【選択図】図1
