放射 ほうしゃ せん分解 ぶんかいじゃありませんでした
hōshasembunkaijārimasendeshita

Noun
Desu Copula

The polite, past negative form of 放射線分解

1. Was not radiation decomposition.; Was not due to radiation decomposition.

Past/Perfective
Negative
Polite
Terminal Form