Patent ID: 7378662

Claim:
A plurality of radiation detector elements, each comprising: a rod-shaped first electrode; a semiconductor device which surrounds an ambience of said first electrode and comes into contact with said first electrode and into which radiation enters; and a second electrode provided for a side surface of said semiconductor device, wherein a part of said first electrode is projected from an edge surface of said semiconductor device where said second electrode is not provided; a plurality of radiation detector elements, in which one of said first electrode and said second electrode is a signal output electrode for outputting a radiation detection signal and the other electrode is a voltage applying electrode; an element holding member which detachably holds said plurality of radiation detector elements and has a plurality of first electric connecting portions which come into contact with said signal output electrode and a plurality of second electric connecting portions which come into contact with said voltage applying electrode; an integrated circuit for processing the radiation detection signal outputted from said signal output electrode of each of said plurality of radiation detector elements; and an integrated circuit holding member on which said integrated circuit is arranged.