Concentrations of 232Th and activity ratios of 228Th to 232Th and 230Th to 232Th were determined in autopsy samples from five former employees of a thorium refinery. The ranges of 232Th activity concentrations (mBq per gram of wet tissue) were 0.17-94 in lungs, 3.9-1210 in pulmonary lymph nodes, 0.14-1.19 in bones, 0.015-0.68 in liver, 0.97-5.8 in spleen, and 0.009-0.068 in kidneys. These concentrations are 10 to 1,000 times greater than have been reported for persons not occupationally exposed to thorium. In most of the samples, the ratios of 228Th to 232Th and 230Th to 232Th activity at death of the subject were 0.2-0.4 and 0.1-0.2, respectively. 228Th to 228Ra activity ratios (+/- standard errors) of 0.86 +/- 0.11 in lungs and 1.18 +/- 0.13 in lymph nodes of one subject were obtained by calculation from ratios of 228Th to 232Th.
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