放射 ほうしゃ せい崩壊 ほうかい系列 けいれつじゃありません
hōshaseihōkaikeiretsujārimasen

Noun
Desu Copula
Negation Auxiliary

The polite negative form of 放射性崩壊系列

1. Is not a radioactive decay series.; It's not a radioactive decay series.

Negative
Polite
Terminal Form
Physics