Alpha is identical to a helium nucleus so it is two protons and two neutrons
It’s the least penetrating and can be absorbed by skin
Beta radiation had high energy electrons emitted from the nucleus and don’t come from a energy shell they come from when a nucleus splits into a proton
Can penetrate air and paper but stopped by a thin sheet of aluminium
Gamma has a short wavelength and high frequency and is electromagnetic so it can travel long distances
Most penetrating and can penetrate air paper and thin metal and can only be stopped by lead and lots of concrete
