Abstract:Radionuclides contents in soil and plants of light rare earth mining area were studied. Distribution of pollutants in soil was analyzed by Nemero comprehensive analysis method, and distribution characteristics of radionuclides in plants were analyzed by enrichment coefficient and transfer coefficient. Together 11 sampling points were set up, and the soil and 5 dominant plants were determined by γ-ray spectrometer. The results show that radionuclides content in soil of mining area is not higher than background value of China or the world, but higher than background value of Baotou City control group. Radionuclides content in soil is the highest in northwest and the lowest in southeast, which causes light pollution. Enrichment, transport and root retention coefficients of five plants are 0.01-0.05, 0.10-0.45, 0.55-0.90, respectively. Enrichment, transport and retention coefficients of thorium nuclides range from 0.01 to 0.09, 0.26 to 0.84, and 0.16 to 0.74, respectively. Enrichment and transport coefficients of 5 dominant plants are all less than 1, and thorium radionuclides is higher than uranium radionuclides. Tolerance of local plants is conducive to ecological restoration of uranium and thorium in soil.