GAMMA RADIATION HAZARD EVALUATION AND EXCESS LIFETIME CANCER RISK ASSESSMENT IN SURFACE SOIL SAMPLES IN PLUAK DAENG DISTRICT IN RAYONG PROVINCE, THAILAND
Keywords:
Specific activity, surface soil, gamma radiation hazard, excess lifetime cancer risk, radioactive contour mapAbstract
The specific activity of natural (226Ra, 232Th, and 40K) and anthropogenic (137Cs) radionuclides in 20 surface soil samples collected from Pluak Daeng district in Rayong province (Thailand) were measured and analysed systematically by using High Purity Germanium (HPGe) detector and gamma-ray spectrometry system. By using the statistic computer program, the specific activity distribution of required radionuclides were studied and presented in this study. It was found that all of distributions of 226Ra, 232Th, 40K, and 137Cs were asymmetrical with the median values of 75.14±1.74, 29.61±0.83, 186.51±7.09, and 1.20±0.22 Bq/kg, respectively. Hence, the median values of 226Ra, 232Th, and 40K would be chosen and used to evaluate the consequential gamma dose and the corresponding radiation hazard for the investigated area and were found to be within the permissible limits. Furthermore, the excess lifetime cancer risk (ELCR(outdoor)) would also be evaluated for the studied area. The results were also compared with the Office of Atoms for Peace (OAP) annual report data, Thailand and global radioactivity measurement and calculations. Moreover, the radioactive contour maps (RCM) of the investigated area were also created and presented in this paper.
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