thorium series

noun

, Chemistry.

1. the radioactive series that starts with thorium and ends with a stable isotope of lead of mass number 208.

thorium series

noun

1. a radioactive series that starts with thorium-232 and ends with lead-208

Example Sentences

Furthermore, in the thorium series 6 alpha particles are lost before reaching the end product, which again is perhaps the chemical analogue of lead.

From Project Gutenberg