noun
decay chain; decay series
Technical term in nuclear physics for the sequence of radioactive decays from a parent nuclide to a stable daughter.
ウラン238の崩壊系列は最終的に鉛206になる。
The decay chain of uranium-238 eventually leads to lead-206.
Compound of 崩壊 (ほうかい, 'decay, collapse') and 系列 (けいれつ, 'series, sequence').