CONTENT OF CS-137 IN HOMEMADE PRESERVES OF MUSHROOMS PICKED IN 2014 BY LOCAL RESIDENTS IN AREAS AFFECTED BY RADIOACTIVE CONTAMINATION AFTER CHERNOBYL NPP ACCIDENT

Radiacionnaâ Gigiena

K. V. Varfolomeeva¹ 

[1] Saint-Petersburg Research Institute of Radiation Hygiene after Professor P.V. Ramzaev, Rospotrebnadzor, Saint-Petersburg, Russia;

关键词: cs-137;    the bryansk region;    chernobyl npp accident;    dried mushrooms;    pickled mushrooms;    homemade mushroom preserves;    radioactive contamination of soil;    culinary reduction;   

DOI  :  

来源: DOAJ

【 摘 要 】

The article presents results of the study made in 2014 on evaluation of the content of Cs-137 in different homemade dried and pickled mushrooms picked by residents of most contaminated areas of the Bryansk region. The aim of the study was to evaluate actual content levels of Cs-137 in homemade preserves of dried and pickled mushrooms picked in the Bryansk region areas with high level of radioactive contamination after Chernobyl accident. Sampling was conducted in residential settlements in proximity to most visited forest areas located at different distances to residential settlements in the range from 0.3 to 5 kilometers, with different forest types, with different soil surface contamination density by Cs-137 in the range from 33 to 944 kBq/m2 (Tentative levels of surface contamination of forest soil are evaluated based on the results of gammaspectrometry measurements in soil samples). The sampling was done at voluntary consent of local residents. In the frameworks of the research in ten settlements with 6112 residents altogether 25 samples were selected (8 samples of dried and 17 of pickled mushrooms).The analyses of study results resulted in the following conclusions: specific activity in samples of different kinds of dry and pickled mushrooms picked by residents of south-west areas of the Bryansk region vary in broad range from 32 to 34000 Bq/kg. The most part of homemade preserves of dried and pickled mushrooms of the local residents exceeds normative levels of permissible mushroom contamination. Cs-137 content in pickled mushrooms is not explicitly dependent on the level of soil surface contamination whereas specific activity of dry mushrooms increases along with the level of surface contamination increase. In the process of mushroom pickling, the additional reduction of Cs-137 content is observed: from 17% to 67% which averages to 37%. Due to the gradual reduction of transfer coefficients for Cs-137 into forest mushrooms and significant contribution of mushroom consumption into internal radiation dose as well as due to a wide scatter of transfer coefficients of the radionuclide into different kinds of mushrooms, the robust forecasting of the expected levels of population exposure requires further study of dynamics of time-dependent changes of the transfer coefficient.

【 授权许可】

Unknown