Summary Following the Chernobyl catastrophe the natural ecosystem of the Tatra's has been seriously radioactively contaminated. The radioactive 137Cs, 134Cs, 90Sr, 239+240Pu, 238Pu, 241Pu and 241Am were the artificial radionuclides found in the Park. The α, β, γ-radionuclides were introduced into the natural environment by nuclear tests conducted in the middle of the 20-th century, and - in 1986 - as a result of the failure of the Chernobyl nuclear reactor. However, some radionuclides (for example 40K) are natural isotopes existing since the earth has formed.
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