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RADIOACTIVITY OF TAP WATER OF TBILISI CITY (GEORGIA) AND ESTIMATION OF RADIOLOGICAL RISK FOR POPULATION
Abstract
Long-term periodic measurements of content of radioactive gas – radon Rn-222 in tap water for different districts of Tbilisi city depending on time (during the period from January, 2009 till December, 2009) were carried out. It is shown, that according to the level of radon content in tap water the investigated districts can be divided conditionally into 2 groups: with rather big radon content – more than 1 Bq L-1 (ranged in the interval 2.15 ± 1.17 Bq L-1, districts Vake, Saburtalo, Ortachala), and districts with rather small radon content - less than 1 Bq L-1 (ranged in the interval 0.36 ± 0.35 Bq L-1, districts Digomi, Isani, Vazisubani). It is underlined, that this radon distribution can be connected with presence of two qualitatively distinguished sources of tap water supply of Tbilisi - underground (artesian wells near settlements Natakhtari, Bulachauri, Mukhrani) and surface (the Tbilisi reservoir filled with waters of the rivers Aragvi and Iori) for which conditions of aeration and degassing by radon have essentially different character. There are marked also some other features in character of radon distribution. Estimates of radiological risk for population were made: estimated values of the committed effective dose and dose equivalent to stomach are: 0.0060 ± 0.0033 mSv y-1 and 0.16 ± 0.09 mSv y-1 for 1st group of districts, and 0.0010 ± 0.0009 mSv y-1 and 0.026 ± 0.025 mSv y-1 for 2nd group of districts.
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References13
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