A Nuclear Facility Site Area The Distribution Of Radionuclides In The Plant - Soil

The majority papers which describe the transfer of radioactive nuclide from soil to plant still focus on ¹³⁷Cs, ⁹⁰Sr, ¹³¹I ¹⁴C,³H nowadays. However, reports about ²³⁸U, ²³²Th, ⁴⁰K are few. Therefore, it is important to study the transfer of radioactive nuclide from soil to plant about ²³⁸U, ²³²Th, ⁴⁰K.Element content such as Uranium, Thorium and Potassium in soil, plants and parts of plants is determined by neutron activation analysis (NAA) after soil and plants sample is collected and treated around a nuclear facility. The disciplinarian for elements' distribution and migration is analyzed in order to understand radioactive situation for soil and plants affected by radioactive stratum. The research attempts to find scientific evidence for burying safely the lowest radioactive waste and evaluating environmental effect from radioactivity.Samples such as vary plants and soil around their roots are collected. According to requirement of analytical method, samples of plants and soil pretreated properly. Content for uranium, Thorium and Potassium is determines by NAA. The analytical result is used to calculate enrichment factor for plants. Some plants class parts. Element content in difference parts is analysis in order to understand element distribution in plants' part. pH value is determined so that we understand how pH affects element enrichment and migration. Otherwise, soil sample is sifted in difference particle size in order to determine element content in soil with difference particle size.Correlation for element content between abnormal zone and comparison zone is analysis basing on statistic theory. However, no matter whether element content and Th/U ratio have not existed correlation for element content and ratio in these zones. Therefore, little external nuclide comes into the abnormal zone.After element content is analyzed, we find large difference between herbaceous plant and fern. There is commonness for element enrichment between herbaceous plants and ferns, respectively. Enrichment factors for Uranium and Thorium in any plants is less than 1. Enrichment factor for potassium in stem and leaf is bigger than in root. Enrichment factor for the majority of stems and leaves is bigger than 1. Enrichment factor for some plants' root is bigger than 1, too. Correlation between soil pH and enrichment factor for vary plants' part. In short, Uranium and Thorium easily enriches in root. However,...