RADIATION & RISK
Bulletin of the National Radiation and Epidemiological Registry
since 1992
About the Journal : 2015 : vol. 24, No. 1 : Long-term monitoring airborne I-131 in the surface layer in Obninsk city, Kaluga region

Long-term monitoring airborne I-131 in the surface layer in Obninsk city, Kaluga region

«Radiation and Risk», 2015, vol. 24, No. 1, pp.96-107

Authors

Ageevа N.V. – Researcher. RPA "Typhoon", Obninsk. Contacts: 4 Pobeda str., Obninsk, Kaluga region, Russia, 249030. Tel.: (484) 397-15-39; e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
Kim V.M. – Lead. Researcher, C. Sc., Phys.-Math. RPA "Typhoon", Obninsk, Россия.
Vasilieva K.I. – Lead. Researcher, C. Sc., Phys.-Math. RPA "Typhoon", Obninsk, Россия.
Katkova M.N. – Head of Lab., C. Sc., Biol. RPA "Typhoon", Obninsk, Россия.
Volokitin A.A. – Lead. Engineer. RPA "Typhoon", Obninsk, Россия.
Polyanskaya O.N. – Researcher. RPA "Typhoon", Obninsk, Россия.

Abstract

Monitoring airborne 131I in Obninsk city was widely discussed some time after the Chernobyl accident, however, the latest data were not reported. The article presents data on volume activity of airborne 131I in the surface layer collected at the meteorological site RPA “Typhoon” in Obninsk City and its surroundings from 1989 to 2013. Main radiation dangerous facilities in Obninsk and the radiation monitoring network in the city of Obninsk and its neighborhoods, as well as characteristics of air-filtering device for registration of radioactive iodine are described. Correlation coefficient (0.9) between the annual release of radionuclides from the Branch of the “Karpov Institute of Physical Chemistry” and registered average volume activity of 131I in the city of Obninsk was calculated. Meteorological conditions on days of registration of increased level of 131I volume activity were analyzed, and the ratio of molecular and aerosol fractions of 131I (the number of cases of detected 131Im/131Ia varied from 1.5 to 16.5 with a mean of 2.6) was evaluated. Radiation risk from inhalation of 131I (2.3·10-9 with the dose coefficient used in the NRB-99/2009) as a conservative estimate was calculated. Its value 10-6 was 3 orders lower than the negligible risk for the population.

Key words
Volume activity of radionuclides, radioactive iodine, air-filtering device, radiation-dangerous object, SSC RF-IPPE, Branch of the “Karpov Institute of Physical Chemistry”, molecular fraction, aerosol fraction, meteorology, radiation risk.

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Full-text article (in Russian)