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|  DOE-HDBK-1130-98
Module 1: Radiological Fundamentals
Instructor's Notes
b.
Range
1)
The alpha particle deposits a large amount of
energy in a short distance of travel.
2)
This large energy deposit limits the penetrating
ability of the alpha particle to a very short
distance.
3)
Range in air is about 1-2 inches.
c.
Shielding
Most alpha particles are stopped by a few centimeters
of air, a sheet of paper, or the dead layer (outer layer)
of skin.
d.
Biological hazards
1)
Alpha particles are not considered an external
radiation hazard. This is because they are easily
stopped by the dead layer of skin.
2)
Internally, the source of the alpha radiation is in
close contact with body tissue and can deposit
large amounts of energy in a small volume of
living body tissue.
e.
Sources
(Insert facility-specific information.)
9
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