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| Preliminary Assessments of Radioactivity Levels in Drinking Water if Guidance Levels are Exceeded |
| XU Jia-ang, HAO Wen-yuan, CHEN Ying-min, YANG Shu-hui |
| Institute of Radiation Medicine, Shandong Academy of Medicine Sciences, Jinan 250062 China |
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Abstract Objective To preliminary discuss the analysis to determine and the assessment if the radioactivity levels in drinking water exceeded the guidance levels of "Standards for Drinking Water Quality"(GB 5749-2006).Methods The drinking waters were determined in this paper according to the methods of "Standard Examination Methods for Drinking Water radiological Parameters"(GB/T 5750.13-2006) and "Gamma Spectrometry Method for Analysis of Radionuclides in Water"(GB/T 16140-1995).A preliminary analysis and evaluation is discussed according to "Basic Standards for Protection Against Ionizing Radiation and for the Safety of Radiation Sources" (GB 18871-2002)and "Guidelines for Drinking-water Quality, Fourth Edition".Results The results showed that, the four activities of gross α and three activities of gross β were exceeded the guidance values of "Standards for Drinking Water Quality"(GB 5749-2006) in the four drinking water samples, respectively. Then activity concentrations of radium-226, thorium-232, potassium-40, uranium-238 and plumbum-210 were further determined by gamma spectrometry method. Our preliminary results indicated that the annual effective doses from drinking-water ingestion were beyond the WHO recommended value 0.1 mSv/a.Conclusion If either of the gross alpha and gross beta guidance levels is exceeded, then the specific radionuclides, such as radium-226, thorium-232, potassium-40, uranium-238, plumbum-210,polonium-210 and other radionuclides related to the levels of total radioactivity, should be identified and measured. As soon as possible, to revise or make evaluation standard for drinking water if either of the gross alpha and gross beta levels is exceeded.
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Received: 06 April 2017
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