RE: Airborne Radioactivity Area and radon

["Huston, Thomas E" <HustonThomasE@UAMS.EDU>]

It would not be an "Airbone Radioactivity Area" for NRC licensees unless the

source of the radon was licensed materials.  See definitions of "Airborne

Radioactivity Area", "Occupational Dose", and "Background Radiation" in 10

CFR Part 20.



Tom



-----Original Message-----

From: epirad@mchsi.com [mailto:epirad@mchsi.com]

Sent: Wednesday, April 17, 2002 1:20 PM

To: RadSafe

Subject: Airborne Radioactivity Area and radon





It is my understanding that "an airborne radioactivity 

area would exist in an area where an employee worked for 

40 hours per week and the radon-222 concentration in 

the area exceeded 7.5 picocuries per liter. An airborne 

radioactivity area requires employee monitoring and 

restricted access to the area by the public."



Does anyone know of even one instance where this has 

been enforced for radon?

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