Distribution and dosimetry of Thorotrast in USUR case 1001

The distribution of radioactivity and the associated doses were evaluated postmortem for USUR Case 1001, a female who had been injected with Thorotrast some 36 y prior to death. The distribution was determined for four nuclides: 232Th and its decay products, 228Ra and 228Th; and 230Th, a contaminant associated with Thorotrast. More than 90% of the activity was associated with the reticuloendothelial system. Approximately 32% of the total activity was found in the total skeleton (mineral bone and bone marrow), which is somewhat higher than expected from the literature. The 44% found in the liver and 12% in the spleen were somewhat lower than expected. This difference may be attributable, in part, to the initial deposition as influenced by colloidal particle size and to the radiation-induced hyposplenism, splenic atrophy, and slight hepatic atrophy observed at autopsy. In addition, roughly 3% of the activity was found in the Thorotrastoma and surrounding carotid artery tissue. Estimated lifetime absorbed doses from the 232Th series were 15 Gy to the liver, 121 Gy to the spleen, 4 Gy to the skeleton, and 16 Gy to the Thorotrastoma. Comparable dose equivalents to these tissues are 300, 2420, 80, and 320 Sv, respectively, assuming a quality factor of 20 for alpha irradiation.