Radioactive ray detecting apparatus

A radioactive ray detecting apparatus equipped with Edge-On type radioactive ray detectors, each having a substrate, on which plural numbers of semiconductor elements enabling to detect radioactive rays are fixed, wherein

• each of said plural numbers of semiconductor elements has plural numbers intra-element pixel regions on a surface thereof, on which said radioactive rays are incident,
• said plural numbers of radioactive ray detectors are aligned along with an X-direction in such disposition that said substrates of the plural numbers of radioactive ray detectors are in parallel with, respectively, when defining said X-direction and a Y-direction on a plane view,
• each of said radioactive ray detectors has said plural numbers of semiconductor elements, which are aligned in said Y-direction, respectively, on one surface and other surface of said substrate,
• when assuming that distance between said semiconductor elements, being provided with putting said substrate therebetween, is “XG1”, while distance from said semiconductor element of one of said radioactive ray detectors up to said semiconductor element of other radioactive ray detectors, facing to said semiconductor element and neighboring with said one radioactive ray detector, is “XG2”, and
• distance between said semiconductor elements alighted in said Y-direction is “YG1”, and further assuming that
• a horizontal pitch of a predetermined pixel pitch to be used as said radioactive ray detector is “a” and a vertical pitch thereof is “b”, width of a surface of each of said plural numbers of semiconductor elements, upon which the radioactive rays are incident, is “c” and length thereof is “d”, and among said plural numbers of intra-element pixel regions of respective one of said plural numbers of semiconductor elements, assuming that length of the intra-element pixel regions, which are positioned at both end portions of respective one of said plural numbers of semiconductor elements, is “e”, respectively, and length of each one of said plural numbers of intra-element pixel regions, being put between the intra-element pixel regions, which are positioned at both end portions of each of said plural numbers of semiconductor elements, is “f”, respectively,
• the following relationships are satisfied:
• c=a−(XG1+XG2)/2
• d=b−YG1=2e+(n−2)f
• e=b/n−YG1/2
• f=b/n (however, “n” is a positive integer).