Most of the costliest metals belong to an ... 1,500 tons of coal in generating power. The demand for this radioactive metal ...

Californium, a metal synthesised in 1950, is the most expensive material in the world because of its extreme rarity and its applications in medicine, industry and security. This metal, synthesised for ...

Orphan radioactive sources or other radioactive material are sometimes unintentionally collected as scrap metal destined for recycling. Over the past decades, there have been several accidents ...