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RE: resuspension factors
EPA publishes an emission factors document for point sources and fugitive emissions sources. It covers a variety of industrial types processes. It can be accessed at http://www.epa.gov/ttn/chief/ap42/
Dan Hoffman
Daniel E. Hoffman, CHP,CIH,CSP
Pangea Group
743 Spirit 40 Park Dr., Ste. 232
Chesterfield, MO 63005
636-519-4856
Mobile 314-707-5606
www.pangea-group.com
-----Original Message-----
From: Thomas E. Potter [mailto:pottert@erols.com]
Sent: Friday, November 29, 2002 9:00 AM
To: RADSAFE
Subject: RE: resuspension factors
Virtually all of the resuspension factor work I have seen, including
NUREG-1720 mentioned by Eric Ablequist, applies to resuspension of
material deposited on floors, soils, or similar surfaces due to typical
mechanical forces--floor traffic, wind, etc. I seriously doubt that
they would be directly applicable to grinding or machining operations
such as those of interest to John Priest. I suspect that use of
conventional resuspension factors for those applications would greatly
underestimate the airborne radioactive material concentration.
Unfortunately, I have no alternate information sources to propose.
There may be some empirical information available in the health physics
literature, but I am unaware of any. There may also be some industrial
hygiene information relating dust load in air due to grinding
operations. That might be useful if one can estimate the average
radioactive material concentration in grindings.
Original post:
Date: Wed, 27 Nov 2002 08:22:59 -0500
From: "Abelquist, Eric" <AbelquiE@ORAU.GOV>
Subject: RE: resuspension factors
A terrific reference on the subject of resuspension factors was just
published by the U.S. Nuclear Regulatory Commission: NUREG-1720
"Re-evaluation of the Indoor Resuspension Factor for the Screening
Analysis of the Building Occupancy Scenario for NRC's License
Termination Rule", NUREG-1720; June 2002.
This NUREG provides an excellent review of past literature concerning
resuspension studies and culminates with a recommendation to use 1E-6
m-1. You can find it electronically on the following web page:
http://www.orau.gov/ddsc/dose/guidance.htm
Regards
Eric
- -----Original Message-----
From: John M Priest Jr [mailto:priestj@DTEENERGY.COM]
Sent: Tuesday, November 26, 2002 3:45 PM
To: radsafe@list.vanderbilt.edu
Subject: resuspension factors
Im looking for some input.
From: brzibung@firstenergycorp.com
To: John M Priest Jr <priestj@dteenergy.com>
Jack:
Would you have knowledge of or know of an electronic reference that
could provide me with resuspension factors for machining on a lathe -
perhaps surface grinding??
I am working on a lesson plan that will help the techs estimate the
amount of radioactivity that could be available to become airborne if,
for example, fixed radioactivity was propelled into the air from a
machining operation. I am using values of E-5 per meter to E-7 per
meter. There is an OE that discusses the machining of a valve stem that
has a stellite seat with fixed and loose contamination of 7.8E8 dpm/100
sq.cm. Consider the airborne activity if you use a resuspension factor
of E-5 per meter.
brz
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