SETTING METHOD FOR TIME OF ESTIMATION OF RADIOACTIVE CLOUD CONTRIBUTION DOSE

摘要

PURPOSE:To find precise dose of radioactive contribution by subtracting the dose rate of natural radioactive rays from the dose in fixed time zones located before and behind a time zone wherein the standard deviation value of the dose rate exceeds a fixed threshold value and by multiplying the same. CONSTITUTION:The time zones set by adding a time of 5-20min to the front and rear of the time zone wherein a time fluctuation rate expressed by the standard deviation value or gradient of the dose rate exceeds a fixed threshold value set beforehand is deemed to be influenced by the radioactive cloud contribution, and the estimation of the dose of the radioactive cloud contribution is made for these time zones.