RE: ventilation holdup question

["Tonry, Louie L MAJ EAMC" <Louie.Tonry@se.amedd.army.mil>]

Check the NRC regulations in Nureg 8.39 or in the old 10.8 regarding xenon
gas spill calculations.  This will give you the already published procedures
for calculating spilled gas clearance times.

		Louie L. Tonry
		LOUIE TONRY, CHP
		MAJOR, MS
		Chief, Radiation Protection Division
 
Eisenhower Army Medical Center 
ATTN: MCHF-LOG-HP (Radiation Protection), Box 264
Ft. Gordon, Georgia 30905-5650

Voice:  					Facsimile: 
DSN: 773-4692/6392 			DSN: 773-3427           
Commercial: (706) 787-4692/6392	Commercial: (706) 787-3427
                            
Internet: Louie.Tonry@SE.AMEDD.ARMY.MIL


-----Original Message-----
From: Minnema, Douglas [mailto:Douglas.Minnema@ns.doe.gov]
Sent: Thursday, June 08, 2000 11:14 AM
To: Multiple recipients of list
Subject: ventilation holdup question



RADSAFErs,

I have a quick technical question that I'm sure somebody can answer off the
top of their head.

Assume that a puff of gas is released into a room that has a ventilation
system operating with X room-changes per hour.  How do I calculate the
'average' time (or whatever is the appropriate metric) for that puff to be
released from the room?  I know that this release would actually look like a
distribution curve, but all I need is an 'average holdup time' in order to
estimate the amount of decay in a short halflife isotope before it is
released.

Thanks,

Doug Minnema, PhD, CHP
Defense Programs
US DOE
<Douglas.Minnema@ns.doe.gov>


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