| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for determining a prevalent incidence direction (incidence direction from a horizontal direction when an apparatus is installed perpendicularly) of gamma rays on a plane. SOLUTION: In the method for discriminating a prevalent incidence direction of gamma rays, a shielding body for allowing angular response of a cylindrical gamma ray detection section to have directional dependence and to rotate around the detection section for changing the position is covered on the detection section, and then is rotated by a fixed angle, thus determining the prevailing incidence direction according to the difference in a plurality of measurement values being measured each time. COPYRIGHT: (C)2004,JPO
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