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Control and Monitoring of Airborne Contamination - doe-hdbk-1113-98_reaffirm_2005_040082
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DOE-HDBK-1113-98
Module 104 Internal Dose Control
Lesson Plan
Instructor's Notes
Airborne contamination
long-term, low-volume air samples that
measurements may be
provide an average of the airborne
described in terms of
concentration over a given time;
Derived Air Concentrations
short-duration, high-volume air
(DACs) in order to
samples taken in the breathing zone of
compare with regulatory
a worker during work activities likely
limits. One DAC is the
to generate airborne contamination;
airborne concentration that
low-volume (about 2 liters per minute)
equals the Annual Limit on
breathing zone samples from personal
Intake divided by the
air monitors; and [Note: A liter is
volume of air breathed by
approximately the same volume as a
an average worker for a
quart. Use the concept of a 2-liter soda
working year of 2000 hours
bottle to describe the quantity.]
(assuming a breathing
continuous air monitors that track
volume of 2400 m3. DAC
airborne contamination levels over
time and can be set to alarm if a
values are found in
specified level is reached.
Appendices A and C of 10
CFR 835. The Annual
It is important that air samples represent
Limit on Intake is the
the actual airborne contamination levels
amount of
breathed by the worker so that accurate
radioactive material taken
intakes may be estimated. Air monitoring
into the body of an adult
is also used to detect loss of containment.
worker by inhalation or
It is important to ensure sample volumes
ingestion in a year that
and methods allow detection of airborne
would result in a
contamination levels below the level of
committed effective dose
concern.
equivalent of 5 rems or a
committed dose equivalent
of 50 rems to any
individual organ or tissue.
47


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