Since they cannot penetrate even the outer dead layer of our skin, they are not an external hazard.
Beta particles are electrons emitted from nucleus of atoms at nearly the speed of light.
Other familiar types of electromagnetic wave radiation include: visible light, ultraviolet light, infrared light, microwaves, and radiowaves.
These differ from X-rays and gamma rays only in wave frequency and energy.
Alpha particles consist of two protons and two neutrons and carry a positive charge.
In 1895, a German physicist named Wilhelm Roentgen fortuitously discovered X-rays while experimenting with evacuated glass tubes through which an electric current was passed.
Roentgen discovered he could take a picture of the bones in his hand with the mysterious new rays.
Ionization is the process by which radiation affects the human body and by which it can be detected as well.
There are four basic types of ionizing radiation: alpha, beta, gamma and neutron.