We compared the methods of sampling and analysis of radionuclide concentrations in samples of common reed in the Chornobyl Exclusion Zone. Selection and analysis of samples were generated using two methods. The first one is consistent with the current regulations, which allow selection and analysis of the whole plant of common reed and calculations of radionuclide concentrations in relation to the wet sample's weight. The second method, adopted in applied ecology, directs the selection of individual plant organs and the calculation of radionuclide concentrations in relation to the weight of the dry sample. It has been established experimentally that when applying the second observation method, the statistical uncertainty of measurement is 2.5 times smaller, which makes this method more suitable for radiological control and monitoring.

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