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Ionizing radiation - hdbk-1130-98_ch10199
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Beta particles


DOE-HDBK-1130-98
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-specif ic information.)
Table 1-2
Alpha Particles
Physical
Large mass (2 protons, 2 neutrons, 0 electrons).
+2 charge.
Characteristics
Very short (about 1-2 inches in air).
Range
Deposits large amount of energy in a short
distance of travel.
Few centimeters of air.
Shielding
Sheet of paper.
Dead layer of skin (outer layer).
No external hazard (dead layer of skin will stop
alpha particles).
Hazards
Internally, the source of alpha radiation is in close
contact with body tissue. It can deposit large amounts
of energy in a small amount of body tissue.
Insert facility-specific information.
Sources
7


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