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RE: Plasma Torch Cutting



Dear Dave,



(1) Chemistry: You are non-specific on the type of contamination on the

surface. But this item is important in order to understand the possible

chemical reactions that can take place.



As an example, C-14 contamination in an oxygen-rich environment (air) (+

heat) would prove a much different sort of radiological hazard (e.g., via CO

and CO2 formation) than would, say, Cs-137 contamination.



(2) The physics describing the release of contaminants or other particles

adhered to surfaces due to heating is a fairly well-known subject (adhesion

w.r.t. volatiles). This is a surface physics item that ought to be familiar

to semiconductor and optics people.



(3) The most significant and typical contributions may be due to the action

of air currents on loose particulate contamination.



The radiological protection issues can be better addressed by the experts

once you obtain and provide more information, particularly item (1).



Best regards,



Grant





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

From: Dave Biela [mailto:Dave.Biela@wvnsco.com]

Sent: Wednesday, August 13, 2003 3:51 PM

To: radsafe@list.vanderbilt.edu

Subject: Plasma Torch Cutting





We are doing some work using a plasma cutter on contaminated stainless

steel and would like to discuss lessons learned with others who have

used this method.



One of the main questions is:  What were your ratios of airborne

contamination concentrations in the work area to contamination levels on

the cut surfaces?



If your interested in a discussion, contact me directly at

dave.biela@wvnsco.com  or

716-942-4423



Thanks

Dave Biela

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