[ RadSafe ] Air Sample Handling

[Bob Shannon]

Depending on subsequent processes to be carried out, I suggest setting up
such that the filter is placed into a bag (any well-sealing rad-free bag)
and is not ever removed prior to muffling. Add tracers and carrier directly
to the filter in the bag prior to ashing. This completely side-steps
concerns about losing particulate matter. 

If, however, the filter must be preserved, for example to punch and face
count a portion or the whole, folding the filter twice (outside edges
meeting in the middle with very slight overlap) eliminates loss of
particulate in the bag since it is captured within the filter itself. One
can then open the leaves to see then entire filter face and punch a section
of filter. As such there is no loss of particulate, rather it may be
somewhat redistributed. The result is a conservative (i.e. positive)"  bias"
for a section in the middle but is at least reflective of material on the
filter 

The good suggestions about different bags only improve the situation.


Bob Shannon
QRS
303-432-1137 

-----Original Message-----
From: radsafe-bounces at radlab.nl [mailto:radsafe-bounces at radlab.nl] On Behalf
Of Robert Atkinson
Sent: Wednesday, November 01, 2006 1:17 AM
To: Nielsen, Erik; radsafe at radlab.nl
Subject: RE: [ RadSafe ] Air Sample Handling

Hi,
Why don't you consider the conductive plastic anti-static bags designed for
electronic components? For example, <
http://uk.farnell.com/jsp/search2/browse.jsp?N=500015&Ntk=gensearch_001&
Ntt=anti-static+bag&Ntx=&_requestid=23922 > The black ones are bulk
conductive and should be better for this application than the silver (buried
layer) type. Even the cheap pink (static resistant) ones would be a big
improvement over a standard Ziploc.

Robert Atkinson.



-----Original Message-----
From: radsafe-bounces at radlab.nl [mailto:radsafe-bounces at radlab.nl] On Behalf
Of Nielsen, Erik
Sent: 01 November 2006 00:45
To: radsafe at radlab.nl
Subject: [ RadSafe ] Air Sample Handling

I am weighing options for handling high volume air particulate samples (4in
and 8x10" )in the field.

Currently we use commercial plastic bags (ziplock) to preserve the sample
during handling and shipping to an analytical laboratory.  We are
considering using an inner envelope of glassine to reduce the quantity of
material dislodged from the filter paper during sample handling.

I am not sure that glassine has significantly less static electricity
buildup than the plastic bags themselves and would like opions as well as
any emperical data to support a specific filter handling regime.

Erik C. Nielsen
Senior Scientist
Remote Sensing Laboratory
P.O. Box 98521, M/S RSL-47
Las Vegas, NV 89193-8521
http://www.nv.doe.gov/nationalsecurity/homelandsecurity/frmac/default.ht
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