珠三角土壤238U·226Ra·232Th和40K含量水平研究

摘要

[Objective]The research aimed to investigate the content and the distribution of natural radionuclide in the soil. [Method] The natural radionuclide (238U,226Ra,232Th and 40K) concentrations in 796 soil samples were deteimined from the Pearl River Delta Economic Zone,using high resolution γ-ray spectroscopic system based on the characteristic spectral peaks. [Result]The mean activity values for 238U,226Ra,232Th and 40K were found to be 142.4,135.9,196.9 and 670.2 Bq/kg, respectively. [Conclusion] The contents of natural radionuclides in soil of Pearl River Delta Economic Zone were higher than the national background content,and the contents of uranium and thorium in the most of the soil were higher.%[目的]为了调查土壤中天然放射性核素的水平和分布.[方法]利用高纯锗γ谱仪,调查珠三角区域内采集的796个土壤样品的天然放射性水平.[结果]土壤放射性核素238U、226Ra、232Th和40K的平均含量分别为142.4、135 9、196.9、670.2 Bq/kg.[结论]珠三角土壤中主要天然放射性核素含量高于全国背景含量,主要表现为土壤铀、钍含量较高.