Soviet Medical Encyclopedia

Actinium

Chemistry & Physics, Radiology & Physiotherapy

Also known as: Ac

Historical document, translated for reference. It reflects medical knowledge of the 1920s–30s and is not medical advice.

Summary

This article defines actinium as a radioactive chemical element derived from uranium. It notes that its decay product is actinium lead and that its radioactivity halves every 20 years.

Encyclopedia entry (1928–1936)

ACTINIUM (from the Greek aktis—ray), a radioactive chemical element (atomic weight 226). Its progenitor is apparently uranium, and the final product of its decay is actinium lead. The activity of actinium itself decreases by half in 20 years.

Cite this page

“Actinium.” Soviet Medical Encyclopedia. English translation of Bolshaya Meditsinskaya Entsiklopediya, 1st ed. (Moscow, 1928–1936), ed. N. A. Semashko. https://sovietmedicalencyclopedia.pages.dev/article/actinium/