Radiation-hygienic assessment of the concentration and distribution of <sup>90</sup>Sr and <sup>137</sup>Cs in ichthyofauna of the Ob’-Irtysh river system-Reference-Cited by-同舟云学术

Radiation-hygienic assessment of the concentration and distribution of ⁹⁰Sr and ¹³⁷Cs in ichthyofauna of the Ob’-Irtysh river system

Published:2019-10-09 Issue:3 Volume:12 Page:16-26
ISSN:2409-9082
Container-title:Radiatsionnaya Gygiena = Radiation Hygiene
language:
Short-container-title:Radiac. gig. (2008)

Author:

Trapeznikov A. V.¹,Nikolkin V. N.¹,Korzhavin A. V.¹,Trapeznikova V. N.¹

Affiliation:

1. Continental radioecology Department of the Institute of Plant and Animal Ecology, Russian Academy of Science, Ural branch

Abstract

The aim of the work is the radiation-hygienic assessment of 90Sr and 137Cs content in fish of the Ob-Irtysh river system and the study of the basic laws of the radionuclides accumulation in the ichthyofauna of these rivers. To perform this task, long-term results of radioecological studies of fish from the Techa, Irtysh and Ob rivers for the period 2004-2016 were used. Fish as a food product was evaluated according to two criteria: a) permissible levels of radionuclides specific activity (SanPiN 2.3.2.1078-01); b) using the indicator of conformity В and uncertainty of its definition ΔВ (GOST 32161-2013 and GOST 32163-2013). It is shown that a higher content of radionuclides is observed in the ichthyofauna of the Techa river (1379.1 Bq/kg for 90Sr and 41.9 Bq/kg for 137Cs). On the Ob and Irtysh rivers, the average specific activity of radionuclides in fish was significantly lower and slightly changed during the surveyed area: for 90Sr in the range of 6.0 ÷ 8.1 Bq/kg (mean 6.8), for 137Cs – 0.6 ÷ 1.9 Bq/kg (mean 1.3). Assessment for compliance with radiation safety criteria using the indicator of compliance and its uncertainty (В+ΔВ) confirmed the unsuitability of use for food purposes by the radiation factor of all studied fish species from the Techa river (45÷55 >1). Fish from all other studied areas of the Ob-Irtysh river system can be used for food without restrictions (0,06÷0,53 < 1). The distribution of 90Sr and 137Cs in the ichthyofauna of the Ob-Irtysh river system part over a 2400 km is presented in the form of empirical regression models. The models describe a sharp decrease in the radionuclides specific activity in fish in the Techa and Iset rivers by two orders for 90Sr (from 2000 to 20 Bq/kg), and by one order for 137Cs (from 40 to 2 Bq/kg). With a high degree of reliability (R2>0.86 for 90Sr and R2>0.92 for 137Cs), the presence of power relationships between the content of radionuclides in the ichthyofauna and their content in water was shown, with adequacy confirmed by Fisher’s F-criteria. This can be used for a preliminary assessment of the radionuclides level in fish based on the results of measurements of the average annual concentrations of these radionuclides in water.

Publisher

SPRI of Radiation Hygiene Prof. PV Ramzaev

Subject

Radiology Nuclear Medicine and imaging

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