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|  Radiological Assessor Training
DOE-HDBK-1141-2001
Instructor's Guide
B. Gamma radiation
Gamma radiation is normally not the controlling
factor at uranium facilities. However, significant
gamma fields can exist in areas where large
quantities of uranium are stored. Appropriate
actions including time, distance, and shielding
considerations should be taken to maintain
radiation doses ALARA.
C. Neutron radiation
compounds should also be considered in
determining potential external radiation hazards.
VI.
Internal dose control
Show OT 6.10.
Intakes
In most uranium facilities, the primary
radiological hazard is the potential for internal
intakes of uranium. This hazard must be
controlled by appropriate facility and equipment
design, contamination control procedures, and
protective clothing.
Inhalation is the primary route of concern.
Uranium transported from the lungs is deposited
in the bone (22%), kidney (12%), or other
tissues (12%), or excreted (54%), according to
International Commission on Radiological
Protection (ICRP) Publication 30.
Control must be verified by a bioassay program.
Urinalysis is the most common technique, but
fecal analysis and in vivo monitoring may also
be appropriate.
Module 6 10
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