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Radiological Assessor Training
DOE-HDBK-1141-2001
Student's Guide
3. Tertiary - Room and associated ventilation systems
Effluent recovery systems
Emergency containment systems
H. Airborne tritium controls
1. Differential room pressure zones - The air
ventilation system plays a key role in controlling
the spread of contamination. In addition to
providing the necessary humidity and
temperature control for a building, differential
pressure zones should be established within a
building to ensure that the air flows from areas
with lower hazardous contamination potential to
areas with more hazardous contamination
potential.
2. Dilution ventilation - Dilution ventilation is the
once-through flow technique of exchanging
outside air for inside air for comfort and basic
contamination control.
3. Room-air detritiation systems - Such a system
uses tritium monitors located in the room
exhaust to activate (close) fast acting dampers.
The dampers then route the exhaust through a
special oxidation/drying system and return the
air to the room.
3. Local exhaust ventilation - The primary
advantage of local exhaust ventilation
techniques is the removal of airborne tritium,
regardless of its evolution rate or chemical or
physical form. In addition, these techniques
use relatively low flow rates compared to
normal ventilation requirements.
Module 7 - 9


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