thorium-228
短语释义与例句
n.
-
1.
A radioactive isotope of thorium, 22890Th, having a half-life of 1.9 years; it occurs naturally in small amounts, as member of the thorium-232 decay chain.
不可数 物理
A radioactive isotope of thorium, 22890Th, having a half-life of 1.9 years; it occurs naturally in small amounts, as member of the thorium-232 decay chain.