| 摘要 |
PROBLEM TO BE SOLVED: To achieve weight reduction of a detector, improvement of detection efficiency of radiations, refinement of detection information by measurement in a half-circular and a circular direction, and improvement of operability by simplification of setting. SOLUTION: The detector detects the incident direction of radiations, and comprises a plurality of scintillators (41, 42, 43) and (101, 102, 103) that are arranged to at least partly overlay in a circumferential direction so as to mutually form shadows to radiations incident from the circular direction and are made of the same material and disenable luminescence of a certain scintillator to enter into other scintillators, and light-receiving elements (51, 52, 53) and (111, 112, 113) that have light-receiving surfaces optically connected with each scintillator. In each scintillator the combinations of the rates of radiations directly entered therein and the radiations of shadows of other scintillators indirectly entered therein are different depending on incident directions in the circumferential direction. COPYRIGHT: (C)2006,JPO&NCIPI
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