Figure 4.

Measured yields of stable chromosomal aberrations in peripheral blood lymphocytes of highly-exposed plutonium workers, moderately-exposed plutonium workers, reactor workers, and unexposed control individuals. Shown on the histograms are the number of aberrations found/number of metaphase cells examined. a, Intrachromosomal aberration (pericentric inversions, paracentric inversions, and intra-arm inversions) measured in chromosome 5. b, Interchromosomal aberrations (apparently simple translocations between any heterologous pair of chromosomes). Note the rarity of intrachromosomal aberrations in the highly exposed reactor workers (who received no plutonium exposure) and in the control group.