人工 じんこう放射 ほうしゃ のうじゃなかったです
jinkōhōshanōjanakattadesu

Noun
Desu Copula

The polite, past negative form of 人工放射能

1. Wasn't artificial radioactivity.; Wasn't man-made radioactivity.

Past/Perfective
Negative
Polite
Casual Register