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Title: COMPREHENSIVE RADIOLOGICAL AND HYGIENIC MONITORING OF PARTICULAR SETTLEMENTS OF KYIV REGION IN 2019.
Author: Vasylenko VV, Zadorozhna GM, Kuriata MS, Lytvynetz LO, Novak DV, Iskra NI, Mischenko LP.
Journal: Probl Radiac Med Radiobiol; 2020 Dec; 25():188-203. PubMed ID: 33361835.
Abstract:
OBJECTIVE: to identificate the main factors and assess their impact on the formation of radiation doses to the population of radioactively contaminated areas of Kyiv region at the current stage of the accident based on complexradiation and hygienic monitoring in the reference settlements in 2019. MATERIALS AND METHODS: Comprehensive radiological and hygienic monitoring was carried out in eight settlementsof Kyiv region - villages of Ragivka, Lygovyky, Mar'yanivka, Zelena Poliana of Polis'kyi district and villages ofHornostaipil, Dytiatky , Pisky, Karpylivka of Ivankiv district. The content of incorporated 137Cs was determined withdirect measurement on whole body counters (WBC) samples of basic foodstuffs were collected to determine the content of radionuclides 90Sr and 137Cs, residents were interviewed about the levels of consumption of these products,and work was performed to estimate external radiation doses. Mathematical, dosimetric, radiochemical methods areused in the work. RESULTS: There was a further decrease in annual doses of internal radiation in the surveyed settlements in 1.3 times, bothin Polis'kyi district (0.041 mSv · year-1 in 2016, 0.030 mSv · year-1 in 2019) and in Ivankiv district (0.023 mSv · year-1in 2016, 0.018 mSv · year-1 in 2019). It is possible to state a slowdown in the reduction of radiation doses comparedto previous years: from 2010 to 2013, the annual doses of internal radiation in the surveyed settlements decreasedby 1.8-2.4 times, from 2013 to 2016 - by 2.3-3.6 times. The content of 137Cs and 90Sr in milk and potatoes in theinspected settlements is lower than the permissible level of the Hygienic Standard HS 6.6.1.1-130-2006 and the useof these foods can not significantly affect the formation of the internal radiation dose. The content of 90Sr in milksamples in the settlements of Ivankiv district is in the range of 2.1-9.9 Bq · kg-1 (in 2016: 1.3-7.4 Bq · kg-1), whichdoes not exceed the permissible level of 20 Bq · kg-1, but due to the dynamics needs further monitoring. The content of 137Cs in samples of dried mushrooms collected from residents of Kyiv region in 2019, as in previous years, issignificantly (up to 100 times) higher than permissible level, and has a high uncertainty - from 1.4 kBq · kg-1 to223.7 kBq · kg-1. CONCLUSIONS: It is established that the annual effective radiation doses of the population in the surveyed settlements in the current year are formed due to internal radiation doses that do not exceed 0.46 mSv · year-1 in Ivankivdistrict and 0.51 mSv · year-1 in Polis'kyi district, which below the RCT criterion 1 mSv · year-1. The main factor that forms the dose of internal radiation of the residents of the surveyed state of emergency of Kyiv region is the intake of 137Cs in the body with forest products, primarily mushrooms. Meta: vyznachennia osnovnykh chynnykiv ta otsinka ïkh vplyvu na formuvannia doz oprominennia naselennia radioaktyvno zabrudnenykh terytoriĭ Kyïvs'koï oblasti na potochnomu etapi avariï na osnovi provedennia kompleksnogoradiatsiĭno-gigiienichnogo monitoryngu v repernykh naselenykh punktakh (NP) u 2019 r.Materialy i metody. Provedeno kompleksnyĭ radiatsiĭno-gigiienichnyĭ monitoryng u vos'my NP Kyïvs'koï oblasti – ss. Ragivka, Lugovyky, Mar’ianivka, Zelena Poliana Polis'kogo raĭonu ta ss. Gornostaĭpil', Dytiatky, Pisky,Karpylivka Ivankivs'kogo raĭonu. Bulo provedeno vyznachennia vmistu inkorporovanogo 137Cs shliakhom priamogovymiriuvannia na lichyl'nykakh vyprominiuvannia liudyny (LVL), zibrano proby osnovnykh produktiv kharchuvanniadlia vyznachennia vmistu v nykh radionuklidiv 90Sr ta 137Ss, opytano meshkantsiv shchodo rivniv spozhyvannia tsykh produktiv ta provedeno roboty z otsinky doz zovnishn'ogo oprominennia. V roboti vykorystano matematychni, dozymetrychni, radiokhimichni metody.Rezul'taty. Zareiestrovano podal'she znyzhennia richnykh doz vnutrishn'ogo oprominennia v obstezhenykh NP u 1,3raza, iak v Polis'komu raĭoni (0,041 mZv · rik-1 u 2016 r.; 0,030 mZv · rik-1 u 2019 r.), tak i v Ivankivs'komu raĭoni(0,023 mZv · rik-1 u 2016 r.; 0,018 mZv · rik-1 u 2019 r.). Mozhna konstatuvaty upovil'nennia znyzhennia dozoprominennia u porivnianni z poperednimy rokamy: z 2010 po 2013 richni dozy vnutrishn'ogo oprominennia u obstezhenykh NP znyzylys' u 1,8–2,4 raza, z 2013 po 2016 – u 2,3–3,6 raza. Vmist 137Cs ta 90Sr u molotsi ta kartopli v obstezhe-nykh NP nyzhchyĭ vid dopustymogo rivnia Gigiienichnogo normatyvu GN 6.6.1.1-130-2006 i vzhyvannia tsykh produktivkharchuvannia ne mozhe suttievo vplyvaty na formuvannia dozy vnutrishn'ogo oprominennia. Vmist 90Sr u probakh moloka v NP Ivankivs'kogo raĭonu lezhyt' v intervali 2,1-9,9 Bk · l-1 (u 2016 rotsi: 1,3-7,4 Bk · l-1), shcho ne perevyshchuiedopustymyĭ riven' 20 Bk · l-1, ale, zvazhaiuchy na dynamiku, potrebuie podal'shogo monitoryngu. Vmist 137Cs u pro-bakh grybiv sushenykh, zibranykh u meshkantsiv Kyïvs'koï oblasti u 2019 rotsi, iak i v poperedni roky, znachno (do 100raziv) perevyshchuie dopustymyĭ riven', i maie velyku nevyznachenist' – vid 1,4 kBk · kg-1 do 223,7 kBk · kg-1.Vysnovky. Vstanovleno, shcho richni efektyvni dozy oprominennia naselennia v obstezhuvanykh NP v potochnomu rotsiformuiut'sia za rakhunok doz vnutrishn'ogo oprominennia, iaki ne perevyshchuiut' 0,46 mZv · rik-1 u Ivankivs'komu raĭoni ta 0,51 mZv · rik-1 u Polis'komu raĭoni, shcho nyzhche kryteriiu radioaktyvno zabrudnenykh terytoriĭ 1 mZv · rik-1.Osnovnym faktorom, iakyĭ formuie dozu vnutrishn'ogo oprominennia meshkantsiv obstezhenykh NP Kyïvs'koï oblasti,ie nadkhodzhennia 137Cs v organizm z lisovymy produktamy, nasampered, grybamy.

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