Radiation detector and radiation detection apparatus

A radiation detector comprising:

• a semiconductor substrate having a first surface and a second surface located on the opposite side from the first surface;
• a light detecting unit provided on a side of the first surface of the semiconductor substrate;
• a first insulating film provided on the first surface to cover the light detecting unit;
• a second insulating film covering the first insulating film;
• a scintillator provided on the second insulating film, and converting radiation into visible light;
• a first opening penetrating through the semiconductor substrate and the first insulating film;
• an interconnection provided between the first insulating film and the second insulating film, and connected to the light detecting unit;
• a first electrode connected to the interconnection through a bottom portion of the first opening, the first electrode being provided on a bottom surface and a side surface of the first opening and on part of the second surface;
• a second electrode provided on a region in the second surface of the semiconductor substrate, the region opposing at least a part of the light detecting unit;
• a second opening provided in the semiconductor substrate, the second opening being located in a region, the region surrounding the first electrode and not surrounding the second electrode;
• and
• an insulating resin layer covering the first electrode, the second electrode, the first opening, and the second opening, the insulating resin layer having a third opening and a fourth opening provided therein, the third opening leading to the first electrode, the fourth opening leading to the second electrode.