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The Four Basic Types of Ionizing Radiation cont'd - hdbk-1130-98_ch10057
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Radiological Worker Training - index
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Beta particles cont'd


DOE-HDBK-1130-98
Module 1: Radiological Fundamentals
Instructor's Notes
Table 1-2
Alpha Particles
Large mass (2 protons, 2 neutrons, 0
Physical
electrons).
Characteristics
+2 charge.
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).
Hazard
Internally, the source of alpha radiation is
s
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
2.
Beta particles
a.
Physical characteristics
1) The beta particle has a small mass and is positively or
negatively charged. Positively charged beta particles are
called positrons and have an electrical charge of plus one.
Negatively charged beta particles are high-energy electrons and
have an electrical charge of minus one.
2) A negatively charged beta particle is physically identical to an
electron.
EO6 Identify the four basic
types of ionizing radiation
and the following for each
type:
a. Physical characteristics
b. Range
c. Shielding
d. Biological hazards
e. Sources
10


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