Studying the Process of Dispersing Gamma Radiation, Radioactive Gas (Radon, Thoron) in Rare Earth Mines

Faculty of Environment, Hanoi University of Mining and Geology, Vietnam

Abstract: In order to serve the national industrialization and modernization process, many mineral mines have been promoted and exploited to serve socio-economic development, including mineral deposits. radiation. When the exploration and exploitation process is carried out, it is necessary to have the impact of artificial factors to upset the rock layers, breaking the natural position of the ore bodies, increasing the dispersion process, leaching… makes the process of dispersing radioactive substances into the environment more and more powerful and complicated. Studying theoretical models and empirical surveys shed light on the spread of radionuclides emitting gamma radiation, radioactive radon, thoron on rare earth ore bodies containing radioactivity. Survey results on rare earth ore bodies cause gamma radiation dose rate with amplitude 0.6  7.7 Sv/h, radon concentration has amplitude (30 ÷ 45).103 Bq/m3, concentration degree thoron amplitude (45 ÷ 70).103 Bq/m3.