[Irradiation doses of population in mountainous Adjara region of Georgia].

Radionuclide content of food and water in high mountainous regions of Georgia - Adjara (Keda, Shuakhevi, Khulo) has been studied, internal and total irradiation doses for the population have been defined and preventive measures for its reduction have been proposed. Internal irradiation dose for the population caused by K-40 was identified as 0,63 mSv/y, total irradiation dose - 1,73 mSv/y, that slightly exceeds acceptable levels, due to this it seems desirable to provide some measures with aim to reduce the radiation dose of the population and conduct further observation of the radiation situation. Measures intended to reduce irradiation doses includes: provision of population with less radioactive water sources, the regulation of medical radiation procedures (mostly - X-ray diagnostic procedures), the rational use of fertilizers with 40K content, construction of buildings on the territories with the lowest values of gamma radiation and radon release from soil, use of materials with low content of natural radionuclides for building construction, provision of premises with effective ventilation and radiation monitoring of buildings at any stages of construction, reconstruction or repair.

[Radioecological situation of Racha-Lechkhumi region of Georgia and hygienic assessment of external irradiation doses of population].

Radioecological situation in Racha-Lechkhumi region of Georgia (Ambrolauri, Oni, Lentekhi, Tsageri districts) and annual effective doses of external irradiation of population have been studied. It was found that outdoor radiation background in Racha-Lechkhumi region is 58.0-169.0 nGy/h; average index is 108.9 nGy/h. Indoor radiation background is 68.0-192.0 nGy/h; average index is 137.4 nGy/h. The average annual effective dose of external irradiation of population in Racha-Lechkhumi region is 0.81 mSv/y, which exceeds the dose of similar type registered in most of countries. The implementation of adequate preventive measures for its reduction is required.

[The radiation background and hygienic assessment of external irradiation doses of population in some mountainous regions of Georgia].

The radioecological situation of Mtskheta-Mtianeti region of Georgia has been studied. Doses from external irradiation were determined and estimated. The average value of radiation background (RB) of open areas in Mtskheta-Mtianeti region accounts 84.6 nGy/h, which is nearly equal to the average values in the countries of western Europe. This shows that investigated territories have high natural radiation background, which considering the geographical position and geophysical situation of Georgia is normal. The average value of radiation background of buildings in investigated territories accounts 120.4 nGy/h, which is little more than worldwide average value. The average annual dose from external irradiation (without radon component) for population of Mtskheta-Mtianeti region accounts 0.99 mZv/y, which is slightly more than worldwide average value. Since approximately 2/3 of effective equivalent dose comes from internal radiation and 1/3--from external radiation, it's reasonable to suppose that the radiation load of population of Mtskheta-Mtianeti region is significant and requires implementation of radiation dose reduction measures.