SPAN gas

["Jim F. Herrold" <Herrold@uwyo.edu>]

Can somebody tell me what the composition of SPAN gas is? It has slipped my
mind (or my mind has slipped) this Tuesday morning (which is starting out
more like a Monday).

Thank you

Jim F. Herrold
Radiation Safety Officer
herrold@uwyo.edu

University of Wyoming
Environmental Health & Safety 
303 Merica Hall
Laramie, WY 82071

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