@misc{oai:repo.qst.go.jp:00065509,
 author = {Kritsananuwat, R. and M.Fukushi and H.Arae and Chanyotha, S. and Sahoo, S.K. and Ｒａｗｉｗａｎ Ｋｒｉｔｓａｎａｎｕｗａｔ and 新江 秀樹 and サフー サラタ クマール},
 month = {May},
 note = {The natural radioactivity and uranium activity ratio in soil samples from four provinces in southern Thailand have been studied. These four selected provinces are proposed as potential sites to set up thermal power plants by Thai government, since the government has planned to construct nuclear power plants (NPPs) as well as coal-fired thermal power plants to generate adequate and reliable electricity for supply a rapidly growing industrialization. It is important to focus not only on security and adequacy of power system but also on environmental protection and monitoring and risk assessment. To carry out environmental monitoring and radiation risk assessment, the concentration of natural radionuclides and radiation hazard parameter play significant roles. These data should be established and available before construction and during operation of power plants. For this reason, a total number of thirty-seven soil samples were collected from those four provinces. The concentration of natural radionuclides including 226Ra, 228Ac and 40K were determined by using gamma spectroscopy. Activity concentrations of 226Ra, 228Ac and 40K vary from 3–160 Bq/kg with an average of 50 Bq/kg, 5–225 Bq/kg with an average of 70 Bq/kg and 0–1425 Bq/kg with an average of 330 Bq/kg, respectively. We have notice that most of the soil samples corrected from one of the four provinces show higher activity concentrations of radionuclides than others. This province is one of the high uranium and thorium level area in Thailand, reported by the Department of Mineral Resource, Thailand. The radiation hazard parameters including absorbed dose rate (D), annual effective dose equivalent (AEDE), radium equivalent activity (AGDE) and external hazard index (Hex) were calculated and compared with the international recommended values. Concentration of uranium was determined using the inductively coupled plasma mass spectrometry (ICP-MS) and isotopic composition of 234U/238U and 235U/238U were determined using thermal ionization mass spectrometry (TIMS). Concentrations of U vary from 1.5–32 μg/g with an average of 9.0 μg/g. Activity ratio of uranium will be presented for the first time in southern Thailand soils., Second International Conference on Radiation and Dosimetry in Various Fields of Research)},
 title = {Natural radionuclides and radiation risk assessment in southern Thailand soils},
 year = {2014}
}