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Research articles

ScienceAsia 47S (2021):ID 120-129 |doi: 10.2306/scienceasia1513-1874.2021.S016

Measurement of radionuclides in surface soil and beach sand samples from Rayong Province (Thailand) and the evaluation of excess lifetime cancer risk

Prasong Kessaratikoona,*, Ruthairat Boonkrongcheepa, Sitthipong Polthumb

ABSTRACT:     Specific activities of natural (40K, 226Ra, and 232Th) and anthropogenic (137Cs) radionuclides in 230 surface soil and beach sand samples collected from the densely populated areas of industrial activities in Rayong Province, Thailand, were analyzed. Experimental results were obtained using a high-purity germanium detector and gamma spectrometric analysis system. The frequency distributions of the four radionuclides were investigated and calculated as suitable medium values of all distributions. According to asymmetrical distribution, medium values of the specific activities of all required radionuclides should be median values. Furthermore, the median values of the three natural radionuclides were also used to evaluate absorbed dose rates in the air (D), radium equivalent (Raeqex), annual effective dose rate (AEDout), and excess lifetime cancer risk (ELCR) in the studied areas. The results were compared with data obtained from the annual report of Thailandís Office of Atoms for Peace, the global radioactivity measurements, and the evaluations and recommended values proposed by the United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR). It was found that most of the results were significantly lower than the recommended values of UNSCEAR except for the median value of specific activity of 226Ra. Moreover, the radioactive contour map for the investigated areas was constructed.

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a Nuclear and Material Physics Research Unit, Department of Basic Science and Mathematics, Faculty of Science, Thaksin University, Songkhla 90000 Thailand
b Thailand Institute of Nuclear Technology (Public Organization), Ongkharak, Nakhon Nayok 26120 Thailand

* Corresponding author, E-mail: prasong_mi@hotmail.com

Received 11 Nov 2020, Accepted 18 Jun 2021