I talk about 'rare' all the time but this is NEXT LEVEL rare...
Throrotrast (colloidal suspension of radioactive thorium-232 dioxide) has been discontinued since the early 1950s!...
Discontinuation was driven by recognition that Thorotrast, once injected, was retained permanently in the reticuloendothelial system (liver, spleen, bone marrow, lymph nodes)... with a biological half-life of several hundred years, resulting in lifelong chronic alpha-particle irradiation...
German Thorotrast Study: median life expectancy was shortened by 14 years, liver cancer standardized mortality ratio exceeding 12,000ā16,000, excess cancer risk persisting for over 50 years after injection... scary stuff!