| 摘要 |
PROBLEM TO BE SOLVED: To precisely measure a dose inside an isolation chamber without moving a detector by a constitution wherein at least four flat sheetlike neutron detectors which are dispersed and arranged at outer faces of the isolation chamber are provided and a neutron radiation can be detected simultaneously. SOLUTION: In this apparatus which measures the dose of a neutron radiation source inside an isolation chamber such as a large glove box(GB) 11, e.g. four sheetlike detectors 13 are arranged on outer faces of the GB 11, and two sheetlike detectors 15 are arranged respectively on its ceiling face and its side face. In the sheetlike detectors 13, 15, their measuring operations are performed synchronously, and neutrons due to a nuclear fission from the neutron radiation source are detected. In addition, small detectors 17a, 17b which measure the total amount of incident neutrons are arranged on the ceiling face and the bottom face. Then, the counting rate of all the neutrons by the respective detectors and the counting rate of a simultaneous measurement are processed by a prescribed algorithm, and a dose in which the difference in the position of the neutron radiation source is corrected and in which the leak amount of the neutrons, e.g. from an adjacent GB or the like is corrected is measured.
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