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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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