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VNU Journal of Science: Mathematics – Physics, Vol. 35, No. 2 (2019) 22-31
Assessment of Natural Radioactivity and Associated Radiation
Hazards in Soils samples from Khammuan Province, Laos
Somsavath Leuangtakoun1, 2,*, Bui Van Loat1, Bui Thi Hong1,
Duong Duc Thang3, Sounthone Singsoupho2
Faculty of Physics, VNU University of Science, 334 Nguyen Trai, Hanoi, Vietnam
National University of Laos, P.O.Box: 7322, Dongdok Vientiane, Lao
Institute for Nuclear Science and Technology, 179 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam
Received 25 January 2019
Revised 23 April 2019; Accepted 24 April 2019
Abstract: In order to assessment of Natural Radioactivity and Associated Radiation Hazards in
soil samples, activity concentration of naturally occurring radionuclides was measured by using a
gamma spectrometer with a high energy resolution HPGe detector. The average radioactivity
concentrations of 226Ra, 232Th and 40K in the surface layers (5‑30 cm depth) collected from
Khammuan province, Laos, were 32.57± 3.35 Bq.kg-1,41.10±3.04 Bq.kg-1 and 295.07± 17.36
Bq.kg-1respectively. From the activity concentration of 226Ra,232Th and 40K, we derived the
parameters using the assessment of the radiological hazard from exposure to these soil samples.
The average absorbed dose rate of all measured samples is 52.02±4.09nGy.h -1, while the average
annual effective dose in the outdoor due to gamma radioactivity is found to be (0.060±0.005)
mSv.y-1.The average values for radium equivalent activity, external and internal hazard indices
were found to be (114.07± 4.70) Bq.kg-1, (0.31± 0.02) and (0.39± 0.03) respectively.
Keywords: Natural radionuclides, Radium Equivalent Activity, Absorbed gamma dose rate,
Annual effective dose rate, Khammuan province.