A cobalt bomb, also known as a salted bomb or a cobalt-thorium G, is a type of radiological weapon that uses radioactive cobalt isotopes as the primary source of radiation. Due to the destructive effects of cobalt bombs, there are various synonyms for this term that have emerged over time. These include doomsday device, salted warhead, cobalt radiological bomb, and radioactive dirty bomb. Regardless of the synonym used, the use of cobalt bombs is a major international concern due to the long-lasting and devastating effects they can have on human life and the environment.