Rays and x - rays have great penetrating power and can pass through human body 厚厚的铅板能隔阻射线及射线
2.
A sheet of aluminium can stop 铝片能隔阻粒子
3.
Paraffin can stop neutrons 石蜡能隔阻中子
4.
A sheet of paper can stop 纸能隔阻粒子
5.
Particles is the lowest among all types of ionizing radiation . a particles can be stopped easily by the outer layer of skin or a sheet of paper 因此，它的能量亦散失得较快，穿透能力在众多电离辐射中是最弱的，人类的皮肤或一张纸已能隔阻粒子。
6.
The alpha particles released from polonium - 210 have a very low penetrating power and can be stopped easily by the outer layer of skin or a sheet of paper . it is unlikely that the particles can affect human body through direct irradiation . however the ionization power of alpha particles is very high 钋210释放的阿尔法粒子穿透能力很弱，人类的皮肤或一张纸已能隔阻它，粒子经照射影响人体的机会很微，不过由于它的电离能力很强，如果人类吸入或进食含有钋210的物质，其释放的阿尔法粒子就能直接破坏内脏细胞，即使所吸收的份量不多，也会损害身体健康，急性高剂量阿尔法辐射可以引致辐射中毒。
