RE: (Another question )RE: Smear Collection Efficiency

["Stokes, James" <StokesJ@TTNUS.COM>]

 I was trained in doing surveys by some of the Defense Programs personnel

that developed and did contamination surveys.  They stated that the

philosophy behind the smear, was to determine how much contamination could

be picked up through incidental contact with contaminated material;  not to

determine how much was on the surface, but how much could be transfered by

contact with that surface.



I realized that codifying saomething into a regulation, can change all of

that.  I was just wantd to provide the historical perspective relative to

intent of the survey.



Jim Stokes RRpt



-----Original Message-----

From: Harald Weiss

To: radsafe

Sent: 4/6/01 5:31 PM

Subject: Re: (Another question )RE: Smear Collection Efficiency



Emil Murat schrieb:

> 

> The question:

> 

> Is a loose contamination, is a smearable?

> 

> 1.1 I had an impression that smear refers to

> "smearable"

> contamination i.e. what can get onto smear.

> So it is irrelevant if all of it gets onto smear or

> only 10% of it.

> 

AFAIK, the result of the smear test has to be corrected with the

"smearing efficiency" in order to find the *removable* (not smearable)

contamination. A value of 10 % is used, if the efficiency is not known.

Normally this value is used. In the few cases I saw, where the

efficiency was measured, it amounted to up to 70 % on smoothly painted

surfaces.



Greetings, 

Harald



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