アクチニウム系けい列れつ

noun

actinium series

Refers to the radioactive decay chain starting with uranium-235 and ending with lead-207, named after actinium-227 which appears in the chain. The gloss 'Actinides' is a broader term and less precise here.

• アクチニウム系けい列れつはウラン235から始はじまる崩ほう壊かい系けい列れつです。