Radiation detector

A radiation detector comprising:

• a first scintillator portion including a plurality of first segments arranged along a predetermined direction, and a first light scattering portion formed between the first segments adjacent to each other through laser irradiation;
• a second scintillator portion including a plurality of second segments arranged along the predetermined direction, and a second light scattering portion formed between the second segments adjacent to each other through laser irradiation;
• and
• a light detection unit optically connected to a first end surface of the first segment positioned closest to one side in the predetermined direction, and a second end surface of the second segment positioned closest to the one side in the predetermined direction,
• wherein the first segment positioned closest to the other side in the predetermined direction and the second segment positioned closest to the other side in the predetermined direction are optically connected to each other,
• the first segments other than the first segment positioned closest to the other side in the predetermined direction and the second segments other than the second segment positioned closest to the other side in the predetermined direction are optically separated from each other, and
• the first scintillator portion and the second scintillator portion are arranged along a direction perpendicular to the predetermined direction.