| 摘要 |
It is an object of the present invention to allow a gamma-ray-source's existing position direction to be detected using a small-volume gamma-ray detector. A gamma-ray's direction detecting apparatus including a plurality of detection pixels for detecting gamma rays, a memory device for memorizing a correspondence relationship in advance, the correspondence relationship being established for indicating, with respect to predetermined gamma-ray's incoming directions, what kind of actual-measurement frequency data should be acquired using the plurality of detection pixels, and a measurement/calculation unit which measures the gamma-ray's actual-measurement frequency data detected using the plurality of detection pixels, and calculates a gamma-ray's incoming direction by using the actual-measurement frequency data and the correspondence relationship memorized into the memory device.
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