[ RadSafe ] Stack Emission Limits

[John R Johnson]

Otto

I didn't know that non SI units were "American units"-:)

John
 _________________
John R Johnson, Ph.D.
*****
President, IDIAS, Inc
4535 West 9-Th Ave
Vancouver B. C.
V6R 2E2
(604) 222-9840
idias at interchange.ubc.ca
*****

-----Original Message-----
From: radsafe-bounces at radlab.nl [mailto:radsafe-bounces at radlab.nl]On
Behalf Of Otto Raabe
Sent: February 7, 2007 10:51 AM
To: Franz Schonhofer; RADCHEM-LIST (RADCHEM-LIST); RADSAFE
Subject: [ RadSafe ] Stack Emission Limits


February 7, 2007

10 CFR Part 20 sets annual average limitation for stack emissions in the
United States.  For example, for carbon-11 monoxide, the annual average
concentration is given as 2E-6 microcuries per milliliter of air. [Sorry
about the American units.] .

My question concerns a brief ultra-high concentration emission that may
occur only occasionally and last only a few seconds. Is there a peak limit
for such an emission? I can always run my exhaust fans for a year to get
the average down to the allowed annual average, but even if the exhaust
fans were turned off after an emission event there is no real difference in
potential exposure risk.  But it seems that I can meet the release limit by
simply running my fans while there are no emissions.

Comments please.

Otto

**********************************************
Prof. Otto G. Raabe, Ph.D., CHP
Center for Health & the Environment
University of California
One Shields Avenue
Davis, CA 95616
E-Mail: ograabe at ucdavis.edu
Phone: (530) 752-7754   FAX: (530) 758-6140
***********************************************
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