RE: Smear Collection Efficiency

[Marty.Bourquin@GRACE.COM]

49CFR173.443(a)(1) states you should wipe an area of 300 square cm then 

average the activity over the area smeared.  Or you can use an 

eqivalent procedure as specified in (2).



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

From: glen.vickers@EXELONCORP.COM [mailto:glen.vickers@EXELONCORP.COM]

Sent: Tuesday, April 03, 2001 1:41 PM

To: baumbaug@NOSC.MIL; alombardo@EARTHSCIENCES.NET;

radsafe@list.vanderbilt.edu

Cc: glen.vickers@EXELONCORP.COM

Subject: RE: Smear Collection Efficiency





Question:  If you wipe a large area of a package in excess of 100 cm^2

without paying attention to the total area wiped, then how do you know 

if

the shipper was in violation of contamination limits if you find 

anything?



glen.vickers@exeloncorp.com



> -----Original Message-----

> From: Joel  Baumbaugh [SMTP:baumbaug@NOSC.MIL]

> Sent: Tuesday, April 03, 2001 9:42 AM

> To: Andrew Lombardo; radsafe@list.vanderbilt.edu

> Subject: RE: Smear Collection Efficiency

> 

>  Radsafers,

> 

>  I think that we have two different "perspectives" here.  Some of us

> are 

> looking at "contamination" in an analytical sense - i.e. how much 

> contamination is actually there and how do we determine/quantify that 

> amount.  Others of us are looking at how much contamination is 

"removable"

> 

> - i.e. how much will be transferred from the surface to the person or

> thing 

> that comes into contact with it.

> 

>  When, at my work, I do a survey (not wiping a sealed source/package

> for 

> removable contamination but of a "work-surface" in a laboratory), I 

am 

> initially looking for "removable" contamination.  I'm looking for

> something 

> (anything) which will leave the surface and contaminate something 

else.

> My 

> initial swipes are typically in excess of 100 cm-2 because I'm 

"looking" 

> for "anything" that is radioactive.  After (if or when) I find 

something, 

> "THEN" I go back and "quantify" what is there and whether there are 

other 

> aspects of the contamination I should worry about - IS it readily

> removable 

> (or even still there), is it an external hazard, should I let it 

decay in 

> place or remove it and HOW to remove it (if necessary), etc., etc.  

Well,

> I 

> don't want to write a book here, but I noticed that while everyone 

was 

> "correct" in what they were saying that it seemed that the group was 

> polarizing (with a couple of exceptions) and not really seeing each

> other's 

> sides....

> 

>  Just my 2 cents (and my "own" personal opinion [NOT the U.S.

> Navy's]),

> 

> 

>  Joel Baumbaugh (baumbaug@nosc.mil)

>  SSC San Diego

> 

> 

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