Ядерна фізика та енергетика Nuclear Physics and Atomic Energy   ISSN: 1818-331X (Print), 2074-0565 (Online)   Publisher: Institute for Nuclear Research of the National Academy of Sciences of Ukraine   Languages: Ukrainian, English, Russian   Periodicity: 4 times per year   Open access peer reviewed journal

Full text (ru)

Abstract: Problem of optimization of sampling procedure for evaluating the median of specific activity and accumulation coefficients of the ¹³⁷Cs and ⁹⁰Sr for the populations of different species of fish lived in the pond was observed. Estimates of the geometric standard deviation of the specific activity (1.2 ÷ 1.9) and accumulation coefficients (1.8 ÷ 2.3) of radionuclides for different species of fish were obtained. Minimum number of samples required for evaluating the median of the specific activity and corresponding accumulation coefficients of ¹³⁷Cs and ⁹⁰Sr with desired relative error was determined. In order to obtain the median value of the specific activity of ¹³⁷Cs with relative error δ = 20 % and confidence level of p = 0.95 at the time of harvest the following numbers of fish samples should be selected for the activity measurement: 16 - 20 samples of pike, perch, sunder, rudd and grass carp; 10 - 13 samples of catfish, bream, tench, carassius, pelecus cultratus; 8-9 samples of bream, roach, carp (common carp), bighead carp; and 5 samples of chub.

Keywords: ¹³⁷Cs, ⁹⁰Sr, fish, specific activity, accumulation coefficients, Chornobyl accident.

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