Radiation image scanner

A radiation image scanner that reads a radiation image from an imaging plate, the radiation image scanner comprising:

• a stage that holds the imaging plate;
• an excitation light source that irradiates the imaging plate held by the stage with excitation light;
• and
• a photodetector that detects light emitted from the imaging plate based on the excitation light, wherein
• the stage includes
• a stage body that includes a supporting surface in surface contact with a back surface of the imaging plate, and
• a positioning mechanism that includes a positioning surface in contact with an edge portion of the imaging plate supported on the supporting surface and positioning the edge portion from outside along the supporting surface while pressing the edge portion against the supporting surface,
• wherein
• the positioning mechanism includes a pair of opening and closing positioning holders,
• at least one of two opposing surfaces of the pair of opening and closing positioning holders forms at least a part of the positioning surface, and
• movement of at least one of the pair of opening and closing positioning holders adjusts an interval between the pair of opening and closing positioning holders, and
• wherein the radiation image scanner further comprises:
• a stage moving mechanism that moves the stage between a setting position where the imaging plate is set with respect to the stage and a reading position where the photodetector reads the radiation image according to the excitation light from the excitation light source;
• and
• a positioning holder operating mechanism that closes the pair of opening and closing positioning holders in accordance with movement of the stage from the setting position to the reading position by the stage moving mechanism.