Cytogenetic monitoring of nuclear power plant workers in Finland

Twenty nuclear power plant (NPP) workers from the two plants in Finland are scored annually for chromosomal aberrations. Results from the first two years of surveillance show that the NPP workers had significantly higher frequencies of radiation-related chromosome-type aberrations in their lymphocytes than the controls. The frequencies if dicentric and ring chromosomes were, however, well within the range that could be expected on the basis of their cumulative radiation exposures. Lymphocyte micronucleus analysis did not reveal any differences between the exposed and the controls. (author)