Radon Behavior And Its Effect On Gamma-ray Radiation Field In The Air

In the environmental assessment, it needs to conduct gamma radiation field measurement. It was affected by many factors, and the atmospheric radon is one of these factors. It impacts on gamma radiation field differently. When the weather changes especially, radon can influence it further. Radon can result in some errors on the results of gamma-ray spectra measurements. In this paper, which had the atmospheric radon and gamma radiation field measurement, and the relationship were analyzed between them.The low level Zn (Ag) scintillation chamber detector was used for atmospheric radon measurement. According to survey results, there were obvious changes in the law of atmospheric radon. Radon concentration in the highest value were attained at 6 am to 9 am and the lowest from 16pm to 19pm.For seasonally changes, the average radon in winter was higher than that of in spring, and the radon average radon concentration was 10.64 Bq/m3in winter and 8.87 Bq/m3 in spring separately. The relationship between radon and weather factors were analyzed, and radon and air temperature was weak negative correlation. The radon in spring was changefully because of the complex and changeable weather.This article studied the radon transportation model. On the basis of studying MM5-scale weather patterns, it was combined with measurement data, and the radon vertical transport model was discussed. Model of the earth-air communication was used to calculate the radon concentration in 1m air.The article focuses on the impaction of atmospheric radon on dose rate, and conducted many experiments to study the relationship between them. The results showed :the correlation between radon in air and dose rate was obvious. Experimental results showed that the range of impact which atmospheric radon to absorbed dose rate was 1.7% - 20.5%. The average radon concentration increased 2.43 Bq/m3, and the dose rate was found increased by 5.2%. The max correlation coefficient of atmospheric radon and dose rate in winter and spring was 0.75. The rain influenced dose rate also, and the absorbed dose rate after rain increased by 26.8% than before. On the basis of experiments, the impact of atmospheric radon on gamma-ray spectrometry was discussed in this paper. The results showed that when the atmospheric radon concentration increased by 25.2% , the area of 609 keV energy peak in full spectra data increased by 14.8%.