[Localization of lung cancer in persons exposed to plutonium-239]

Pulmonary cancer site was studied in 131 workers engaged into radioactive chemicals production and 178 examinees of control group. All examinees died in 1965-1989. Incorporation of plutonium-239 increased the number of lower lobe pulmonary cancers (upper-0.49; medium-0.06; lower-0.45) compared to 0.72; 0.03; 0.25 in control group. Ratio of cancer sites attributing to plutonium-239 was calculated for various levels of relative risk. Cancer site in the lower lobe appeared to show high probability attributing to plutonium-239 with relative risk over 1.39; in the case of upper lobe the relative risk was 3.67.