Abstract
Identification of clay minerals and depositional environment in soil at Ben Tre Province—South Vietnam was studied in this work by using laboratory HPGe gamma spectrometry through the evaluation of 232Th, 238U, 226Ra and 40K natural radionuclide distributions in soil versus depths. The calculated values of activity concentration ranged from 2.13 ± 0.13 to 6.64 ± 0.40 ppm for 238U, from 1.97 ± 0.12 to 4.95 ± 0.30 ppm for 226Ra, from 8.87 ± 0.53 to 21.30 ± 1.27 ppm for 232Th and from 0.85 ± 0.05 to 2.01 ± 0.12% for 40K. The results showed that clay minerals at the investigated site can be divided into two major groups: montmorillonite (the Th/K ratio from 6.61 to 10.47) and kaolinite (from 12.37 to 19.79) which are in accordant with the previous studies at the investigated area.
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