Patent ID: 8110809

Claim:
A radiation detector, comprising: a semiconductor detector including a plurality of semiconductor detection devices configured to generate electron-hole pairs based on entry of the radiation, wherein the semiconductor detector includes n number of semiconductor detection device arrays, each of which is formed of semiconductor crystalline substrate, provided on a board, the plural semiconductor detection devices are arranged in a first direction with a designated gap, the n number of the semiconductor detection device arrays are arranged in a second direction perpendicular to the first direction to form a 1 st line through an nth line, the semiconductor detection device arrays of the 1 st line through the nth line are arranged in order from the 1 st line to the nth line so as to be shifted at any of 0, 1/n, . . . , (n−1)/n of the designated gap from a reference position in the first direction, where n is an integer number and equal to or greater than 2, each of the semiconductor detection device arrays of the 1 st line through the nth line includes a protection member situated at an end part in the first direction of the semiconductor detection device arrays so that the end parts are situated at the same length from the reference position, and a groove part is formed between said protection member and one of said semiconductor detection devices adjacent to said protection member.