Correlation Study On Tritium Content In Soil In The Surrounding Environment Of Qinshan Nuclear

As the only radioactive isotope of hydrogen,strontium(3H,T)is one of the main nuclei for the evaluation of radioactive doses in nuclear facilities.With the continuous development of nuclear energy,there are bound to be more and more cockroaches released into the environment,causing potential harm to the environment.The cockroaches released into the environment can easily enter the soil and cause harm to the human body through the food chain and internal irradiation,in order to evaluate the radioactive hazard of 3H in the soil,it is necessary to grasp and understand the migration and transformation behavior of 3H in the soil and the impact of related environmental factors.This paper takes Qinshan Nuclear Power Base as the research object,in January and May 2018,and selects two different soils(non-cultivated and cultivated soil)of five different sampling points(Zhongjiaqiao,Qinlian Village,Xizhangmen,Ganpu,Yanjiaqiao)in its peripheral environment,collect soil samples in different soil layers(0-2cm,0-5cm,5-10 cm,10-15 cm,15-20 cm,20-25cm),study on the species and quantity of hydrogen-containing microorganisms,physical and chemical properties,content of deuterated water(HTO)and organic germanium(OBT)in soil samples and their correlations.The results showed that the number of hydrogen-containing microorganisms was the highest in the uncultivated surface layer,and the cultivated soil was the most in the deep layer.The number of sampling points was the largest in Zhongjiaqiao,and it increased first and then decreased with the depth of the soil layer.In general,non-cultivation The number of hydrogen-containing microorganisms in the soil is twice that of cultivated soil.The content of organic matter was the highest in the surface layer(0-2 cm),and it showed a downward trend with the increase of soil depth.The organic matter content of Qinlian sampling point was the highest.The water content of the soil ranges from 19.56% to 32.13%,which basically decreases with the deepening of the soil layer.The concentration of HTO activity was the highest at the sampling point of Zhongjiaqiao,and it decreased with the increase of soil depth.The highest concentration of HTO activity in winter appeared deep(10-25cm),and in spring it was in the surface layer.The activity concentration of HTO in winter soil is more than twice that in spring,and the activity concentration of HTO in non-cultivated soil is greater than that in cultivated soil.The maximum concentration of OBT activity in the soil generally appears in the surface layer(0-5 cm),and gradually decreases with the depth of the soil layer.The changes of OBT concentration in winter and spring were different.The concentration of OBT in the soil of Yanjiaqiao and Qinlian was higher than that in spring,and the other three sampling points were opposite.In general,the concentration of OBT in non-cultivated soil is greater than that of cultivated soil.Correlation analysis showed that there was no correlation between HTO concentration in soil and the number of hydrogen-containing microorganisms and organic matter;there was an indirect correlation between HTO and OBT concentration and water content and OBT concentration in soil and hydrogen-containing microorganisms and organic matter content.The arithmetic mean of the OBT/HTO ratio in the soil is 0.644,and the winter ratio is less than the spring;the tillage soil ratio is twice the ratio of the uncultivated soil at the corresponding sampling point.In winter,the maximum value appears in the deep layer,and the minimum value appears in the surface layer,but the spring maximum appears on the surface layer.Through this study,it is found that the environmental behaviors of alfalfa in cultivated soil and non-cultivated soil are different at the same sampling point,and the content of radon in different layers varies with seasons,the changes of HTO and OBT contents in soils with different depths in uncultivated soil were stronger than those of corresponding tillage soils.Therefore,non-cultivated soil should be collected as a sample when monitoring and evaluation of plutonium in the soil around the nuclear facility.At the same time,the parameters of the radon concentration prediction model in the soil should be selected for different seasons and different depths.