| 摘要 |
PURPOSE:To accurately find a calibration constant in a short time and without making an operating mistake. CONSTITUTION:A source fixation jug 20 in which individual radiation sources 22-1 to 22-8 have been installed in positions faced with individual radiation detectors 1-1 to 1-8 is arranged in the measuring area of a radioactive contamination monitor. In a first calibration process, counted values of the individual radiation detectors 1-1 to 1-8 in a state that a beta-ray shielding plate 23 has been attached are found. Then, in a second calibration process, counted values of the individual radiation detectors 1-1 to 1-8 in a state that the beta-ray shielding plate 23 has been detached are found. Then, in a third calibration process, individual calibration constants with reference to the individual radiation detectors 1-1 to 1-8 are computed from the individual counted values obtained by the first and second calibration processes.
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