| 释义 |
ac·ti·non
\ˈaktəˌnän\ noun
(-s)
Etymology: New Latin, from actinium + -on
: a heavy radioactive gaseous isotope of the group of inert gases that is isotopic with radon and thoron, is formed from actinium X, emits alpha rays, and lives only a few seconds (mass number 219) — called also actinium emanation; see actinium series |