Cesium-137
Césio 137 - O Pesadelo de Goiânia: Trilha Sonora (Otávio Garcia)
In 1987, in Goiânia, two paper collectors find a radioactive capsule and sell it to the owner of a junkyard. Once the capsule is opened, more than 250 people end up contaminated by the substance called Cesium 137, being the biggest radiological accident in the history of Brazil.