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DOE-HDBK-1106-97
E.
Ventilation Control
1. Airflow
Airflow should be from the areas of least contamination to areas of most
contamination (e.g., clean to contaminated to highly contaminated areas) such as
fume hoods, gloveboxes, etc.
2. Pressure differential
Slight negative pressure is maintained in buildings/rooms where potential
contamination exists.
3. High Efficiency Particulate Air (HEPA) filtration.
HEPA filters, which remove radioactive particles from the air, may be used. This
is commonly required for higher levels of airborne radioactivity such as
concentrations exceeding 10 percent of the Derived Air Concentration (DAC) for
a particular radionuclide. Charcoal filters are required for specific radionuclides
such as iodine. Ventilation system requirements should be determined in
consultation with the Radiological Control Organization.
A DAC is the radionuclide airborne concentration. Breathing an air concentration
of 1 DAC for 1 working year (2,000 hours) will result in committed dose
equivalent equal to an annual limit, i.e., 5 rem whole-body or 50 rem to any
organ or tissue.
4. Flow rate
Always check the flow rate or pressure in ventilated enclosures before starting
operations. Air flow is easily measured with an inexpensive velometer. Refer to
facility-specific flow rate measurement requirements.
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