Penetrating Powers of Ionizing Radiation Image
ALPHA Particles
Stopped by a sheet of paper
and cannot penetrate the
outer dead layer of skin
BETA Particles
Stopped by a layer of clothing
or a thin sheet of a substance,
such as aluminum
GAMMA Rays and X-Rays
Stopped by several feet of
concrete or a few inches of
^pCMV Environmental Protection RadTown Radiation Exposure Activity Set	EPA 402-B-19-038
' * Agency -Powers-lonizing-Radiation