Abstract
The radiological hazards from natural radionuclides in soil at the border area between the northeast of Thailand and Laos were studied and evaluated. The 33 surface soil samples from Khong Chiam and Sirinthon districts in Ubon Ratchathani province were collected and measured the specific radioactivity (226Ra, 232Th and 40K). The radioactivity of all soil samples was analyzed from gamma ray spectrums using hyper-pure germanium detector. The results applied for calculating the radiological hazards which were radium equivalent activity (Raeq), absorbed dose rate (D), annual effective dose equivalent (AEDEout) and external hazard index (Hex). The experimental results obtained the radioactivity concentrations in a range of 10.64 to 46.67 Bqkg−1 with average value of 22.82 ± 3.59 Bqkg−1, 6.35 to 44.72 Bqkg−1 with average value of 15.49 ± 3.57 Bqkg−1 and 31.22 to 521.57 Bqkg−1 with average value of 130.44 ± 28.46 Bqkg−1 for 226Ra, 232Th and 40K, respectively. The calculation results of Raeq, D, AEDEout and Hex showed significantly lower than the radiological hazard levels which are recommended by the United Nations Scientific Committee on the Effects of Atomic Radiation. The results of this study reveal that people can live and travel along the border area in the northeast of Thailand.
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