PROBLEMS OF compliance OF THE RADIONUCLIDS CONTENT IN FUEL WOOD with THE HYGIENIC REGULATIONS IN NORTHERN DISTRICTS OF KYIV AND ZHYTOMYR REGIONS
DOI:
https://doi.org/10.31548/dopovidi2018.01.003Keywords:
specific activity, fuel wood, 90Sr, 137Сs, hygienic norms, fuel power plantsAbstract
The purpose of this work was to carry out research on the establishment of pollution of 137Cs and 90Sr fuel wood from the forest areas of the northern districts of the Kiev and Zhytomyr regions and assessment of its compliance with the SSSAR-2005.
Using preliminary experience of conducting similar surveys and recommendations for monitoring, in 2017 pilot sites were selected and a concurrent sampling of soil and wood samples from the Polissya district of the Kyiv region and the Narodychy, Ovruch and Korosten districts of Zhytomyr region was conducted.
A total of 137Cs and 90Sr content of 17 soil samples and 20 samples of neo-coral wood were selected and analyzed. The samples of wood were taken from the most widespread forests wood species in these regions - pine and birch. In all selected samples with using standard methods of gamma, beta spectrometry and radiochemistry, was measured activity of 137Cs and 90Sr.
It was found that the specific activity of 137Cs in a 30 cm layer of forest soils was 74 ± 15 - 6380 ± 64 Bq/kg, 90Sr was in the range from 1 ± 0.5 to 65 ± 5.4 Bq/kg. The specific activity of 137Cs in the samples of wood was in the range of <9 - 744 ± 16 Bq/kg, and 90Sr - from 31 ± 0.5 to 1503 ± 193 Bq/kg. It is shown that 90 % of samples of wood exceed SSSAR-2005 for 90Sr (60 Bq/kg), while for 137Cs only 5 % of samples do not meet this norm (600 Bq/kg).
The conducted studies confirmed the high probability of obtaining wood from radioactive contaminated forest areas, which does not correspond to the SSSAR-2005.
It is concluded that taking into account the total specific activity of 137Cs and 90Sr in the studied samples of wood and low ash contenting of this fuel, there is a high probability of obtaining an ash residue with a specific activity of more than 10 kBq/kg which corresponds to the OSPU-2005 criterion for low-level radioactive waste
The obtained results confirmed the necessity of thorough radiological control of the use of fuel wood on the territories affected by the Chornobyl catastrophe and prove the need for further research on the estimation and prediction of radioactive contamination of wood and obtaining conclusions about the possibility of safe use of this type of fuel. Based on the data obtained, the need to revise the normative for 137Cs and 90Sr in fuelwood is confirmed, as well as addition separate regulations normative for wood fuel wich using as fuel for industry power plants.
Continued research on the contamination of 137Cs and 90Sr of fuel wood from radioactive contaminated forest areas and assessment of its compliance, SSSAR-2005, will reduce the social tension in the society related to the concern of the population about the possibility of using local wood as a fuel and will facilitate the optimization of radiation control system, improvement of the radiological situation and, as a consequence, the living standard and the health of the local population.
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