 |
|||
|
|
|||
|
|
|||
| ||||||||||
|
|  DOE-HDBK-1106-97
Lesson Plan
Instructor's Notes
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
Insert facility-specific
Always check the flow rate or pressure in ventilated
requirements.
enclosures before staring operations. Air flow is easily
measured with an inexpensive velometer.
22
|
|
Privacy Statement - Press Release - Copyright Information. - Contact Us |
Click
here for thousands of PDF manuals