Specific activity of natural and anthropogenic radionuclides and radiological hazard assessment in surface soil samples collected along the Andaman sea coast in southern region of Thailand

International Nuclear Science and Technology Conference 2014

Kessaratikoon, P.^1 ; Boonkrongcheep, R.^1 ; Benjakul, S.^1 ; Udomsomporn, S.^2

Department of Physics, Faculty of Science, Thaksin University, Muang, Songkhla, Thailand^1

Office of Atoms for Peace (OAP), 16 Vibhavadi Rangsit Rd, Chatuchak, Bangkok, Thailand^2

关键词: Absorbed dose rate;    Annual effective dose;    Anthropogenic radionuclides;    External hazard index;    Gamma spectrometry;    High purity germanium detectors;    Radiological hazard;    Radium equivalent activity;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/611/1/012021/pdf
DOI  :  10.1088/1742-6596/611/1/012021

来源: IOP

【 摘 要 】

The specific activities of natural (40K,226Ra and232Th) and anthropogenic radionuclides (137Cs) in 314 surface soil samples collected from three provinces (Phuket, Phang-Nga and Krabi) along the Andaman sea coast in southern region of Thailand were studied and evaluated. Experimental results were obtained by using a high-purity germanium (HPGe) detector and gamma spectrometry analysis system. It was found that the mean values of specific activities of40K,226Ra,232Th and137Cs were 2859.63 ± 209.83, 157.10 ± 8.06, 137.16 ± 7.26 and 4.88 ± 2.34 Bq/kg, respectively. Furthermore, four radiological hazard indices which are absorbed dose rate in air (D), radium equivalent activity (Raeq), external hazard index (Hex) and annual effective dose rate (AEDout) in the area under consideration were also calculated and came out to be 277.11 ± 16.96 nGy/h, 575.16 ± 34.67 Bq/kg, 1.55 ± 0.09 and 0.34 ± 0.02 mSv/y, respectively. The experimental results were also compared and found to be comparable with national and global radioactivity measurements and evaluations. Moreover, the radioactive contour maps of the investigated area were also created and presented in this paper.