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Use of Containment Devices cont'd
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DOE-HDBK-1113-98
Module 104 Internal Dose Control
Lesson Plan
Instructor's Notes
monitoring methods in use at
long-term, low-volume air samples that
your facilit y.
provide an average of the airborne
Airborne contamination
concentration over a given time;
measurments may be described
short-duration, high-volume air samples
in terms of Derived Air
taken in the breathing zone of a worker
Concentrations (DACs) in order
during work activities likely to generate
to compare with regulatory
airborne contamination;
limits. One DAC is the airborne
low-volume (about 2 liters per minute)
concentration that equals the
breathing zone samples from personal air
Annual Limit on Intake divided
monitors; and [Note: A liter is
by the volume of air breathed by
approximately the same volume as a
an average worker for a working
quart. Use the concept of a 2-liter soda
year of 2000 hou rs (assuming a
bottle to discribe the quantity.]
breathing volume of 2400 m3.
continuous air monitors that track
DAC values are found in
airbor ne conta minatio n levels over time
Appendices A and C of 10 CFR
and can be set to alarm if a specified
835. The Annual Limit on
level is reached.
Intake is the amount of
radioactive material taken into
It is important that air samples represent
the body of an adult worker by
the actual airborne contamination levels
inhalation or ingestion in a year
breathed by the worker so that accurate
that would result in a committed
intakes may be estimated. Air monitoring
effective dose equivalent of 5
is also used to detect loss of containment.
rems or a committed dose
It is important to ensure sample volumes
equivalent of 50 rems to any
and methods allow detection of airborne
individual organ or tissue.
contamination levels below the level of
concern.
d.
Minimization of Contamination Areas
48


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