PHƯƠNG PHÁP XÁC ĐỊNH CÁC THAM SỐ VẬT LÍ ẢNH HƯỞNG ĐẾN NỒNG ĐỘ RADON TRONG ĐẤT

Abstract

The study presents the procedures for determining three physical parameters affecting radioactive concentration of radon in soils, including radioactive concentrations of ²²⁶Ra, emanation coefficient, and diffusion coefficient of radon. The activity content of ²²⁶Ra in soils was analyzed by gamma-ray and alpha-particle spectrometry. For alpha-particle spectrometry, MnO₂ discs were used to preconcentrate ²²⁶Ra from the soil samples. Coefficicent emanation and diffusion coefficient of radon were determined in the laboratory and in the field by using a specialized equipment for radon measurement - RAD7 and a sample storage system designed in this study. To verify the reliability and suitability of the applied methods, Student’s paired t-test was performed and compared with the mean of the results. The differences of the results from each method were acceptable with the confidence of 95%.