RE: resuspension factors

["Thomas E. Potter" <pottert@erols.com>]

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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