| 摘要 |
PURPOSE:To provide a dust radiation monitor system capable of sharply reducing the number of dust radiation monitors installed as compared with the number of radioactivity measuring points, capable of shortening the missing time to the extent possible, and having the improved responsiveness when the radiation level is abnormally fluctuated. CONSTITUTION:A dust radiation monitor system measuring the radiation level of dust contained in the air with a pair of a radiation detector 4 and a radiation measuring unit 5 at multiple sampling points (S1-S12) is provided with multiple selector valves B1-B12 arranged on pipes P1-P12 and capable of switching the flow of air, a sequence circuit 6 giving the switching command to the selector valves B1-B12 in sequence at the cycle of the minimum time required for measuring the radiation level, and an integrating unit 7 calculating the fluctuation between the present value and the previous value of the radiation level measured by the radiation measuring unit 5 is calculated for each channel and integrating the fluctuation calculated for each channel within the preset time.
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