放射 ほうしゃ せい指示 しじ やくじゃなかったです
hōsha seishi jiyakujanakattadesu

Noun
Desu Copula

The polite, past negative form of 放射性指示薬

1. Wasn't a radiotracer.; Wasn't a radioactive indicator.

Past/Perfective
Negative
Polite
Casual Register