[ RadSafe ] Air monitor question

[Brennan, Mike (DOH)]

Hi, John.

Just a thought:  Would the system allow for an upstream baffle?  That
would cause turbulence even in low flow situations.  A fancier fix would
be something either spring loaded or vertically hinged, so in high flow
it would be pushed out of the way, providing less resistance, but would
automatically deploy in low flow situations.  

Both of these might provide places for undesirable things to build up,
but that's why I am a "big picture" guy.

-----Original Message-----
From: radsafe-bounces at health.phys.iit.edu
[mailto:radsafe-bounces at health.phys.iit.edu] On Behalf Of
JOHN.RICH at sargentlundy.com
Sent: Thursday, March 11, 2010 3:53 PM
To: radsafe at health.phys.iit.edu
Subject: [ RadSafe ] Air monitor question

Radsafers

we have a plant vent monitor with the following problem: 

On occasion, the airflow is reduced to the point were there isn't enough

to produce turbulent flow, mixing, or a velocity anywhere  near the that

needed for isokinetic sampling. 

If anybody has had a similar situation, I'd like to discuss our proposed

"fix" with you.  The thinking at the moment is to develop a conservative

compensation factor that would be applied to the releases measured and 
recorded during these periods.  But there are could be hidden traps in 
this approach that will cause problems down the road.

thanx  in advance
 - - jmr


John Rich
312-269-3768
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