RE: Data on Porous Surfaces

["Honerlah, Hans B NAB02" <Hans.B.Honerlah@nab02.usace.army.mil>]

You may want to look at NUREG-1507 "Minimum Detectable Concentrations With
Typical Radiation Survey Instruments for Various Contaminants and Field
Conditions".  This discusses several conditions that may impact you survey
results, (i.e. effects of oils/paints/water/dust, as well as, different
types of material wood/tile/concrete...).  I think this document can be
downloaded from the NRC home page.  Some folks at ORNL who put this together
and may have more information.  This also discusses some new MDC/total
activity equations utilizing two efficiencies - one is the instrument
efficiency - two is the source efficiency / surface efficiency.  This is
also recommending the surveyor use experimentally determined surface
efficiencies for anticipated field conditions.

Has anyone out started utilizing any of this new equations and or any
comments on their viability/cost effectiveness for decommissioning
activities?       

Hans Honerlah, USACE, Baltimore
hans.b.honerlah@usace.army.mil <mailto:hans.b.honerlah@usace.army.mil>  


		-----Original Message-----
		From:	Redmond, Randy R. (RXQ)  [mailto:RXQ@ornl.gov]
		Sent:	Wednesday, November 04, 1998 6:36 AM
		To:	Multiple recipients of list
		Subject:	Data on Porous Surfaces

		I am trying to find some data or, preferably, reports or
articles, which
		deal with the expected quantity of rad contamination which
could be
		trapped in the pores of a porous surface and remain
undetected while an
		alpha scan shows the surface to be at or below some release
criteria.
		Surely, someone has done an experimental or theoretical
study of this -
		I am just after a very rough estimate of what we might have
hidden in
		the pores of a closed cell foam rubber.  Data for large cell
porous
		ceramics or weathered wood would probably be quite relevant.


		Randy Redmond
		Lockheed Martin Energy Systems
		P.O. Box 2009
		Bldg.  9769,  MS 8081
		Oak Ridge, TN  37831-8081
		Email:  rxq@cosmail3.ctd.ornl.gov
		Phone:  423-574-5640
		Fax:  423-576-6047

	
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