Radiation detector, and radiation detector array

A radiation detector comprising:

• a scintillator including a pair of end surfaces opposing each other in a first direction, and a first side surface and a second side surface opposing each other in a second direction intersecting the first direction and coupling the pair of end surfaces, the scintillator having a rectangular shape when viewed in the first direction;
• a first semiconductor photodetector including a first semiconductor substrate disposed to oppose the first side surface;
• a second semiconductor photodetector including a second semiconductor substrate disposed to oppose the second side surface;
• a first wiring member electrically connected to the first semiconductor photodetector;
• and
• a second wiring member electrically connected to the second semiconductor photodetector, wherein
• a length of the scintillator in the first direction is longer than both of a length of the scintillator in the second direction and a length of the scintillator in a third direction parallel to the first side surface,
• a length of the first side surface in the first direction is longer than a width of the first side surface in the third direction,
• a length of the second side surface in the first direction is longer than a width of the second side surface in the third direction,
• the first semiconductor substrate includes
• a first portion covered with the first side surface, and
• a second portion disposed with the first portion in the first direction and exposed from the first side surface,
• the second semiconductor substrate includes
• a third portion covered with the second side surface, and
• a fourth portion disposed with the third portion in the first direction and exposed from the second side surface,
• each of the first semiconductor photodetector and the second semiconductor photodetector includes a plurality of photodetection regions including at least one avalanche photodiode arranged to operate in Geiger mode, and at least one quenching resistor electrically connected in series with one of an anode or a cathode of a corresponding avalanche photodiode of the at least one avalanche photodiode,
• the first semiconductor photodetector includes
• a plurality of first electrodes electrically connected to the at least one quenching resistor included in the first semiconductor photodetector and included in a corresponding photodetection region of the plurality of photodetection regions, and
• a second electrode electrically connected to another of the anode or the cathode of the avalanche photodiode included in the first semiconductor photodetector and included in the corresponding photodetection region of the plurality of photodetection regions,
• the second semiconductor photodetector includes
• a plurality of third electrodes electrically connected to the at least one quenching resistor included in the second semiconductor photodetector and included in the corresponding photodetection region of the plurality of photodetection regions, and
• a fourth electrode electrically connected to another of the anode or the cathode of the avalanche photodiode included in the second semiconductor photodetector and included in the corresponding photodetection region of the plurality of photodetection regions,
• the plurality of photodetection regions included in the first semiconductor photodetector are disposed in the first portion,
• the plurality of first electrodes and the second electrode are disposed in the second portion,
• the plurality of photodetection regions included in the second semiconductor photodetector are disposed in the third portion,
• the plurality of third electrodes and the fourth electrode are disposed in the fourth portion,
• the first wiring member includes a plurality of conductors electrically connected to a corresponding first electrode of the plurality of first electrodes, and a conductor connected to the second electrode, and
• the second wiring member includes a plurality of conductors electrically connected to at least one of the third electrodes of the plurality of third electrodes, and a conductor connected to the fourth electrode.