n.[化]钍(符号Th;原子序90)
Marie found another called thorium. 玛丽发现了另一种物质,叫钍。
A radioactive isotope of thorium with mass number228. 射钍钍的放射性同位,质量数为
This is clearly confirmed by the detection of thorium. 这显然证实了检测钍.
They recognized that in a thorium province Pb208 would present complications. 他们承认,含钍区内的Pb208会产生干扰。
Followed by the slow decomposition of uranium to another element thorium. 铀元素随后缓慢分解为另一种元素钍。