RE: Low energy x-ray (8 kev) survey meter

["Dunn, Wes" <WDunn@intiso.com>]

The only thing I would add to Ted's very clear synopsis is that for a
mixed use x-ray facility (e.g., all sorts of critters, plus some EMs),
it is often useful to use a scintillator for a quick and dirty survey to
find any stray leaks.  Then use a pancake GM to locate the leaks (the
scintillator will generally saturate long before you can do more than
generalize the area).  Then one can use an ion chamber to quantify the
leak (if needed). 

Wes

Wesley M. Dunn, CHP, Director, Environmental Health & Safety
International Isotopes, Inc.
3100 Jim Christal Road
Denton, Texas  76207
Wdunn@intiso.com <mailto:Wdunn@intiso.com>
Corporate Website:  http://www.intiso.com
940-484-9492; 940-484-0877 (fax)


	-----Original Message-----
	From:	TDC@ehssun.lbl.gov [SMTP:TDC@ehssun.lbl.gov]
	Sent:	Tuesday, June 09, 1998 7:23 PM
	To:	Multiple recipients of list
	Subject:	Re: Low energy x-ray (8 kev) survey meter

	Let me chime in on this one.

	I read the two previous responses and agree with Ron that an ION
chamber
	would be the best to MEASURE with BUT there are serious geometry
	considerations that make accurate measurements non-trivial - to
say the
	least.

	....
	I seldom find any good reason to attempt to measure the primary
beam - ONLY
	in accident reconstruction.  This is another process that
requires great
	care and consideration.