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Radioactive caesium nuclids were measured in follicular fluid and seminal plasma after the nuclear power station accident of Chernobyl. Immediately after the event (June - Aug. 86) both Cs 137 and Cs 134 were negative, with the exception of one sample. Increased levels of Cs 137 were found in the next three periods of measurement (Nov. 86 - Jan. 87), (June - Aug. 87), (March 88), with the highest results one year after the accident. Increased levels of Cs 134 were found only in the last two periods of measurement. In seminal plasma, both Cs 137 and Cs 134, were elevated in some samples. An influence on the results of IVF was not registered.