@misc{oai:repo.qst.go.jp:00071506,
 author = {R.Kritsananuwat and M.Fukushi and K.Pangza and S.K.Sahoo and Ｒａｗｉｗａｎ Ｋｒｉｔｓａｎａｎｕｗａｔ and サフー サラタ クマール},
 month = {Sep},
 note = {This paper reports distribution of naturally occurring radionuclides and uranium activity ratio in marine sediments from the selected coast along the Gulf of Thailand to establish baseline data. Thailand has a plan to construct nuclear power plants (NPPs) as well as coal-fired thermal power plants to generate adequate and reliable electricity supply for rapid growth of industrialization. Therefore, it is important to focus not only security and adequacy of power system but also environmental protection and monitoring and risk assessment. To carry out environmental monitoring, baseline data play a significant role. These data should be established and available before set up of mega projects that could impact the environment and health. Therefore, we have collected samples from five areas in the Gulf of Thailand those are proposed as potential sites to set up power plants by Thailand government. A total number of fifty-four marine sediment samples were collected. Gamma spectroscopy was used to determine the concentration of natural radionuclides e.g. 226Ra, 228Ac and 40K. Activity concentrations of 226Ra, 228Ac and 40K vary from 2.91–67.17 Bq/kg with an average of 26.64±14.57 Bq/kg, 4.42–109.17 Bq/kg with an average of 43.79±23.92 Bq/kg and 3.36–1004.56 Bq/kg with an average of 393.56±208.04Bq/kg, respectively. 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. We have noticed that sediments from two sites characterized by similar geological nature of landforms with a rocky coast have higher concentration of natural radionuclides. 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 0.42–3.98 μg/g with an average of 1.93±0.95 μg/g. Activity ratio of uranium will be presented for the first time in Thailand gulf sediments. Variation in concentration of natural radionuclies at different sampling sites may be attributed to geological characteristics., International Conference on RADIOECOLOGY & ENVIRONMENTAL RADIOACTIVITY},
 title = {DISTRIBUTION OF NATURAL RADIONUCLIDES AND URANIUM ACTIVITY RATIO IN GULF OF THAILAND SEDIMENTS AS BASE LINE DATA},
 year = {2014}
}