Washington State's Public Health Laboratories Th - Thorium A long halflife radioactive metal, thorium was identified in 1821and isolated by J. J. Berzelius in 1828 in Sweden.
Thorium is used in gas lamp mantles and nuclear breeder reactors.
The oxide is a weak base. Crystal are face centered cubic. Click mass number for decay process, product for element page. MeV Pa-237 237.0 MASS abund. This is not a publication of Phoenix College.