The book of science

Tom Sharp

StockholmMorten Thrane Esmark, Jöns Jacob Berzelius elements


Atomic number 90

Radioactive stuff

Esmark and Berzelius were not aware that thorium was radioactive. Marie Curie and Gerhard Carl Schmidt independently observed its radioactivity in 1898. What you don’t know might hurt you; however, radiation from thorium is so weak that you may handle it safely; it doesn’t penetrate the skin.

See also in The book of science:

Readings on wikipedia:

Other readings:

  • Thorium,” Elementymology & Elements Multidict, by Peter van der Krogt