放射 ほうしゃ年代 ねんだい測定 そくていでしょう
hōshanendaisokuteideshō

Noun
Desu Copula

Expresses probability in a polite manner ("probably…") of 放射年代測定

1. Probably radiodating.; Likely radiometrically dated.

Polite
Presumptive
Conjecture