Hoang Huu Duc, Nguyen Duc Minh, Phan Viet Cuong, Le Toan Anh, Loat Bui Van, Somsavath Leuangtakoun

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This paper studies the soil-to-plant transfer factors of natural occurring radioisotopes (238U and 232Th) on Luong My Tea farm, Tan Thanh district, Luong Son commune, Hoa Binh province. The activity concentrations in leaves, trunk and roots of the tea tree at no harvest period (winter break) were determined. The measurements were carried out using gamma spectroscopy with high puritygermanium detector HP(Ge). The research results show that the activity of 238U and 232Th is higher in the tea tree’s leaves than in its trunk and roots. The soil-leave transfer factors (TF) for 238U and 232Th were determined as follows: TFU-238 = 0.52 – 0.87; TFTh-232 = 0.25 – 0.43.

Keywords: Relative efficiency curve, low background gamma spectroscopy


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