放射 ほうしゃ せい核種 かくしゅでしょう
hōshaseikakushudeshō

Noun
Desu Copula

Expresses probability in a polite manner ("probably…") of 放射性核種

1. Probably radioactive.; It will likely be a radioisotope.

Polite
Presumptive
Conjecture
Physics