PROBLEM TO BE SOLVED: To stabilize optical characteristics of a radiation detector.SOLUTION: A radiation detector comprises: a first support member extending in a longitudinal direction； a second support member that is engaged with the first support member and extends in the longitudinal direction； a fluorescent body that is supported by the second support member and extends in a longitudinal direction to convert radiation into light； and a sensor section that is supported by the first support member and senses light from the fluorescent body.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2020,JPO&INPIT【課題】放射線検出器の光学特性を安定化する。【解決手段】長手方向に延びた第１の支持部材と、第１の支持部材と嵌合する、長手方向に延びた第２の支持部材と、第２の支持部材に支持され、長手方向に延びた、放射線を光に変換する蛍光体と、第１の支持部材に支持され、蛍光体からの光を感知するセンサ部と、を備える。【選択図】図１
