RE: ventilation holdup question

["Goff, Tom" <gofft@wipp.carlsbad.nm.us>]

The equation is (from ICRP 37 - Appendix B)

send me your fax number and I'll send it to you.

Tom Goff
WIPP Radiological Engineering
(505) 234-8861
(fax)  234-6027
e-mail  GoffT@WIPP.Carlsbad.NM.US
page (505) 234-8850  (pager 479)
P.O. Box 2078
Carlsbad, NM 88221
Radiological Engineering:  Anticipating Radiological Problems
             Developing Techniques to Deal with Them


-----Original Message-----
From: Minnema, Douglas [mailto:Douglas.Minnema@ns.doe.gov]
Sent: Thursday, June 08, 2000 9:15 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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