Natalia Borul EVOLUTION of Cs-137 CONTENT of PRIVATE SECTOR
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View metadata, citation and similar papers at core.ac.uk brought to you by CORE 80 ISSN 1813-1166 print / ISSN 2306-1472 online. Proceedings of the National Aviation University. 2014. N 3(60): 80-86 UDC 504.75.(477)(045) Natalia Borul EVOLUTION OF Cs-137 CONTENT OF PRIVATE SECTOR MILK PRODUCED IN SETTLEMENTS OF DUBROVYTSIA DISTRICT OF RIVNE REGION National Aviation University Kosmonavta Komarova avenue 1, 03680, Kyiv, Ukraine Е-mail: [email protected] Abstract. In the article a problem of radioactive contamination of private sector milk produced in Dubrovytsia district of Rivne region which is the most affected by the Chernobyl accident has been considered. The monitoring results of Cs-137 content in milk of settlements under study have been analyzed for a period of 1988-2010. Keywords: Chernobyl accident; Cs-137; internal radiation dose; private sector milk; radioactive contamination. 1. Introduction Due to its solubility Cs-137 joins the human food chain, and, therefore population of contaminated A problem of radioactive contamination of the food territories gets 90 % of exposure exactly as a result products that are daily consumed by the North of local food products consumption. Polissia population affected by the Chernobyl accident is extraordinarily urgent today. Taking into account a long half-decay period of The level of radioecological danger for a Cs-137 (30 years), as well as a significant role of population living on contaminated territories after milk in a daily food ration of population residing at the Chernobyl accident together with other factors the territories contaminated as a result of the can be essentially characterized just by the value of Chernobyl accident, the problem of Cs-137 content radioactive contamination of the products consumed in milk, as a basic dose-forming factor of internal by population. irradiation, continues to be the subject of interest for Although 28 years have already passed after the many experts [1, 4, 6, 7]. Chernobyl accident, about half of Cs-137 activity The purpose of the article is to analyse the passes to rural population organisms with results of radiation monitoring of Cs-137 content in radiocontaminated milk [2, 4, 6]. milk at the most affected by the Chernobyl accident Therefore, the investigation of evolution of Cs-137 settlements of Dubrovytsia district of Rivne region. content in private sector milk, as a basic dose- 3. Radioactive contamination of the territory of forming food product for certain settlements from Dubrovytsia district investigated district, is undoubtedly a vital task. Radioactive contamination of a considerable amount 2. Literature overview of agricultural lands of Belarus, Russia, Ukraine and Considerable areas of Ukrainian Polissia and other some European countries resulted from the territories became radiocontaminated, as a result of Chernobyl accident in 1986. the Chernobyl accident. Radioactive contamination of the environment The wide range of forms and composition of and deterioration of population health, as a result of emitted radioactive substances, duration of the Chernobyl accident, became the subject of emissions and their non-monotonic nature, weather scientific research for many Ukrainian and foreign modification resulted in complicated field patterns scientists. of the areas contaminated with radionuclides. It is a leading topic of different scientific, popular The structure of contaminated areas of Chernobyl science, and theoretical and practical publications. origin is uneven, spotted, extended along the stream Wide areas of six “northern” districts of Rivne lines [5]. region (Berezne, Volodymerets, Dubrovytsia, In turn, surface activity on radiocontaminated Rokytne, Zarichne and Sarny districts) were territories, type, composition and structure of soil as radiocontaminated after the Chernobyl accident. well as chemical properties of radionuclides Today, Dubrovytsia district of Rivne region still determine the values of radionuclide contents in remains one of the most affected by the Chernobyl plant products, pasture and meadow vegetation [3]. accident. Copyright © 2014 National Aviation University http://www.nau.edu.ua N. Borul. Evolution of Cs-137 content of private sector milk produced in settlements of Dubrovytsia district of Rivne region 81 According to 1989 data about the actual radiation It happened due to natural disintegration, situation formed at the investigated area as a result carryover of Cs-137 together with a harvest, vertical of the Chernobyl accident, the average surface and horizontal migration of radionuclide in the soil activity on radiocontaminated territory varied from profile. 0.8 to 8.4 Ci/km2. The radioactive contamination of soils in the The maximum level of soil radioactive most affected by the Chernobyl accident settlements contamination was registered in the Village of of Dubrovytsia district of Rivne region, namely Rudnya – 13.7 Ci/km2. agricultural lands, pastures and woodlands in the The most radiocontaminated villages were the Villages of Budymlia, Perebrody, Myliachi, Velykiy following: Veliun – 8.4 Ci/km2, Zagreblia – 7 Ci/km2, Cheremel, Velyki Ozera, Zhaden, Shahy, became Liudyn – 6.5 Ci/km2, Partizanske – 6.2 Ci/km2. Cs-137 the subject of our research. content in milk exceeded a permissible level in all It is known that sandy and peaty soils, which are without exception settlements of Dubrovytsia district. characteristic for the above mentioned villages, do Almost all the Dubrovytsia forestry territory was not promote Cs-137 fixation in soil, and, therefore, radiocontaminated. plants actively absorb radionuclides in mobile forms During 1989 the radiological situation control from the soil solution nearby root systems. group of Dubrovytsia district Sanitary and Subsequently, the population living on the Epidemiological Service gathered and studied a territories of these settlements receives higher doses great number of samples of farm products and of internal irradiation due to the consumption of private sector milk. local food products compared to population of other In accordance with the data obtained throughout settlements of Dubrovytsia district. the above mentioned studies, it was defined that the worst radioecological situation was formed in the 4. Radioactive contamination of private sector Villages of Budymlia, Perebrody, Myliachi, Velykiy milk in settlements under investigation Cheremel, Velyki Ozera, Zhaden, Shahy, Veliun, For conducting investigations of Cs-137 content in Liudyn, where there were observed high values of private sector milk in the above mentioned exceeded temporally permissible levels of settlements Sanitary and Epidemiological Service of radionuclide contents in food products (ТPLs-88). Dubrovytsia district has a certified testing The monitoring results of Cs-137 content in laboratory. private sector milk exactly in these settlements will Evolution of Cs-137 content in private sector be further presented in this study. milk for the period of 1988–2010 was retraced Such pattern of radioactive contamination of the using the results of investigation of private sector given district was predefined by the fact that the milk samples in six settlements of Dubrovytsia forests, meadows and pastures, especially in the district of Rivne region, that are considered to be the Polissia region on territory of which Dubrovytsia most affected after the Chernobyl accident. district is located, are the most dangerous territories In addition, most rural residents of the given according to the radiological indicators, as they have territories live in small settlements with undeveloped higher values of radionuclide’s transition infrastructure, and therefore have near natural coefficients from soil to vegetation in comparison with arable lands and soils of other regions affected lifestyle. by the Chernobyl accident. The data representing Cs-137 content in private According to data collected in 2006 by Rivne sector milk in settlements of Dubrovytsia district Regional State Project and Technological Centre of (Villages of Budymlia, Perebrody, Myliachi, Soil Fertility and Products Quality Protection as Velykiy Cheremel, Velyki Ozera, Zhaden, Shahy) result of monitoring of radionuclide content in soil for a period of 1988–2010, are given in Table 1. of control plots, agricultural lands in Dubrovytsia Permissible level of specific Cs-137 activity in district with surface activity over 1 Ci/km2 make up milk according to PLs-2006 is 100 Bq/l. 6.7 thousands hectares (17.1 %), and with surface Figure presents changes of the indicators of activity over 5 Ci/km2 – 130.3 hectares (0.3 %). radiation environment on basis of average annual The major part of radiocontaminated territories values of Cs-137 content in private sector milk has 1-2 Ci/km2 surface activity. samples in the most affected after the Chernobyl There is no doubt that surface Cs-137 activity of accident settlements of Dubrovytsia district of Rivne soils has decreased compared to 1986-1991. region. 82 ISSN 1813-1166 print / ISSN 2306-1472 online. Proceedings of the National Aviation University. 2014. N 3(60): 80-86 Radioactive contamination of milk produced in settlements of Dubrovytsia district for a period of 1988–2010 The given data concerning radioactive contamination In 1990, there were conducted 126 test analyses of private sector milk and its graphic interpretation allow aimed at determining radioactive contamination of making a conclusion that the risk associated with receipt private sector milk with Cs-137 in settlements