SPACE DOSE EVALUATING METHOD FROM ATOMIC POWER FACILITIES

摘要

PURPOSE:To easily and surely measure the dose of radiations occuring in the radioactive clouds from atomic power facilities by identifying whether there is an effect of radioactive clouds or not by the use of the standard deviation values of dose rate changes. CONSTITUTION:The standard deviation values are obtained from the measured outputs of the peripheral space dose rate measuring apparatus disposed around the atomic power facilities and when they exceed the predetermined threshold value, it is identified that there is an effect of the radioactive clouds from the atomic power facilities in the measured outputs. The measured output mean values just before and after the time zone where the indentification was made are compared with the highest frequency of the natural radiation dose rate frequency distribution where there is no effect of the radioactive clouds from the facilities at the nonrainfall time extending over a relatively longtime, at the nonrainfall time and with the minimum value of the time zone where the identification was made at the rainfall, and th minimum value out of these is subtracted from the measured output of the time zone where the identification was made, and the remaining amounts are integrated.