“…The first provable example of this mode of radiological terrorism was the murder of former Russian spy Alexander Litvinenko in 2006 by polonium-210 ingestion.In September 1987, in Goiania, Brazil, scavengers lifted a metal canister containing 1,375 curies of cesium-137 from a radiotherapy machine in an abandoned cancer clinic and eventually gave it to a junkyard. The junk dealer opened the canister, causing the dispersal of radioactive material through runoff and wind, resulting in the contamination of 200 people, the death of 4 people, and radiation injury to 28 people, which shows how hazardous radioactive waste from medical sources can be[13].…”