人工 じんこう放射 ほうしゃ のうじゃありませんでした
jinkōhōshanōjārimasendeshita

Noun
Desu Copula

The polite, past negative form of 人工放射能

1. Was not artificial radioactivity.; Was not man-made radioactivity.

Past/Perfective
Negative
Polite
Terminal Form