Radium mainly emits what's called alpha radiation, which are clumps of two neutrons and two protons.

镭主要释放所谓的α辐射，即两个中子和两个质子的团块。

It has somewhat higher energy than alpha radiation, but it can still be stopped by a sheet of aluminum foil or the top layers of your skin.

它的能量比阿尔法辐射高一些，但仍然可以被一张铝箔纸或皮肤表层阻挡。