Problems of Radiation Medicine and Radiobiology

H. M. Chobotko, L. A. Raichuk, V. P. Landin

Institute of Agroecology and Environmental Management, National Academy of Agrarian Sciences of Ukraine, 12 Metrologichna str., Kyiv, 03143, Ukraine

CHARACTERISTICS AND PROGNOSIS OF THE INTERNAL EXPOSURE DOSES OF THE UKRAINIAN POLISSYA RURAL POPULATION IN THE REMOTE PERIOD AFTER THE ACCIDENT AT THE CHERNOBYL NUCLEAR POWER PLANT (MONITORING STUDY)

Objective: Estimation of the forest ecosystem influence on the formation of annual effective internal exposure doses (¹³⁷Cs) of the Ukrainian Polissya population in the remote period after the Chornobyl accident and predictive modeling of the internal exposure doses of the region residents.
Materials and methods. Dosimetric control of the population (adults and children of school age, for 80 people in the group on average in the settlement) of the Kyiv region was conducted during 2003–2011 with the Scriner-3M spectrometer according to «Methodical recommendations for conducting measurements using whole body counters for dosimetric certification of settlements» [9]. Gamma-spectrometric analysis of the samples was conducted by the spectrometric method (DSTU 3743-98) with SEG-005, the BEDG-63 detector. Experimental data were analyzed using Microsoft Excel 2016 and OriginPro 9. Computer modeling was carried out in the mathematical software MAPLE 10.
Results. Annual effective internal exposure doses of Ukrainian Polissya inhabitants determine by the contamination level of certain ecosystems, first of all so-called critical ones. For the region under study these are primarily forest ecosystems and natural forage areas which can cause significant body burdens of the population due to the consumption of milk and forest food products like wild-breed mushrooms, forest berries, game, etc. The approximation of experimental data by seasons, obtained on the WBC-measurements results, confirmed the hypothesis of the exponential distribution for spring and the lognormal one for autumn. The exponential distribution is typical for statistical ensembles, formation factors of which are little variable or permanent. Thereby, neither of dos-forming factors, for instance, any food product, is determinative in spring.
Conclusions. The probability of receiving annual effective internal exposure doses by the population increases significantly in autumn versus spring as a result of forest food products consumption like mushrooms, berries, game meat, etc.
Key words: forest ecosystem, mathematical model, effective internal exposure dose, ChNPP.

Problems of radiation medicine and radiobiology.
2018;23:216_228. doi: 10.33145/2304-8336-2018-23-216-228.

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