| 摘要 |
PURPOSE:To realize constantly highly accurate radioactive contamination measurement without being influenced by a position of a subject. CONSTITUTION:A detection sensitivity curve indicating sensitivity characteristics of respective radiation detectors 1a to 1c is obtained from counted values when a moving means 14 for moving a radiation source 13 for calibration to respective positions in a measurement area formed by the plurality of radiation detectors 1a to 1c and the radiation source 13 are placed at the respective positions in the measurement area. A radioactive contamination monitor comprises a calibration constant calculating means 10 for determining a calibration constant corresponding to a ratio of an average value wherein an envelope of the above detection sensitivity curve is averaged with radiation source intensity of the radiation source 13 and a correcting means 10 for correcting the counted value wherein radioactive rays from a subject is detected by the respective radiation detectors la to 1c with the calibration constant determined by the calibration constant calculating means 10.
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