放射 ほうしゃ のう汚染 おせんではありませんでした
hōshanōosendewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 放射能汚染

1. Was not radioactive contamination.; Was not radioactively contaminated.

Past/Perfective
Negative
Polite
Formal Register