核辐射,或通常称之为放射性,存在于所有的物质之中,这是亿万年来存在的客观事实,是正常现象。核辐射是原子核从一种结构或一种能量状态转变为另一种结构或另一种能量状态过程中所释放出来的微观粒子流。核辐射可以使物质引起电离或激发,故称为 Nuclear radiation, or what is commonly called radioactivity, is present in all matter and is an objective fact for billions of years and is a normal phenomenon. Nuclear radiation is the flow of microscopic particles released by a nucleus from one structure or one energy state to another or from another energy state. Nuclear radiation can make the material cause ionization or excitation, so called