Оцінка внеску 228Ra в дозу опромінення мешканців м. Києва, які споживають артезіанську воду

• Main Authors: Buzynnyi, M., Pryhodko, R., Mykhailova, L., Panasiuk, M.
• Format: Article
• Language: Ukrainian
• Published: State Scientific and Technical Center for Nuclear and Radiation Safety 2024
• Online Access: https://nuclear-journal.com/index.php/journal/article/view/1152

The article describes the introduction of highly sensitive methods for determining the activity of radium isotopes in drinking water and an example of using these methods to estimate public exposure doses from natural radionuclides caused by the consumption of artesian water in Kyiv. An α/β liquid scintillation spectrometer (LSC) and a semiconductor gamma spectrometer were used to measure the activity concentration of 226Ra, 228Ra and the sum of uranium isotopes (∑U). The characteristic feature of the introduced methods is a minimum number of technological steps. We applied commonly used ion-exchange resins to concentrate the radium, and the columns were made from commonly used materials. Uranium was extracted with a tributyl phosphate solution in o-xylene aiming the ∑U determination by the LSC technique. Exposure doses were estimated as a lifetime dose. We take into account age-dependent dose coefficients and corresponding weighting coefficients. Artesian water samples, a total of 25 studied, represent water used for municipal water supply, beverages and bottled water production, as well as alternative water supply stations in Kyiv. The activity concentration of 228Ra in the studied samples varies from 7 mBq/l to 99 mBq/l. These values correspond to a lifetime dose of 6 to 90 μSv per year, which for different sources is from 79.2 % to 97.5 % of the total exposure dose from the intake of uranium and radium isotopes with drinking water.