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RE: Smear Collection Efficiency
In addition:
NRC Reg Guide 1.86 Table 1 footnote (e) and 10CFR835 Appendix D, footnote (4)
both include the statement:
"The amount of removable radioactive material per 100cm(2) of surface area
should be determined by wiping the area with dry filter or soft absorbent paper,
applying moderate pressure, and assessing the amount of radioactive material on
the wipe with an appropriate instrument of known efficiency".
Marty.Bourquin@GRACE.COM on 04/04/2001 08:49:02 AM
Please respond to Marty.Bourquin@GRACE.COM
To: radsafe@list.vanderbilt.edu
cc: (bcc: Brian Keele/Contract/SWEC)
Subject: RE: Smear Collection Efficiency
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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