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Chromosome analyses have been performed on peripheral blood lymphocytes from 54 men with estimates of plutonium body burdens in excess of 296 Bq. Both stable and unstable aberrations were scored using a banding technique and breakpoints noted. In discussing the significance of aberration frequencies the relative proportions of the different types of aberration and their distribution have been considered and account has been taken of external radiation exposure. It is suggested that significant depositions of plutonium do cause an increase in chromosome aberrations. The distribution of the breakpoints in the controls showed an excess in chromosomes 7 and 14. The formation and survival of radiation-induced breakpoints was randomly distributed amongst the chromosomes according to length. The distribution of the breakpoints within the chromosomes showed an excess in the centromeres and telomeres. Possible hot spots occurred in some of these regions and also in certain bands of the intermediate regions of the chromosomes.
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