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The oxygen "window" is the determinant, and the delivery gas is important in that it must not cause other problems, like narcosis in the argon and the fact that the molecule is huge. Neon is exptremely expensive , and again, does nothing. The total of the inert gases is what is important, not the makeup thereof. In other word, if you mix argon , neon, nitogen with 21 persent oxygen, you still have the basic decompression effect of using air for both on and off gassing, but here are other complications and speed variables. Just the lack of a gas is not so important as the presence of the oxygen. Oxygen also displaces other gases, can saturate the tissues and blood, and is metabolized, not all of which is true with other gases. Others will disagree with this, bnut the studies, inclduing the most recent wrok indicates that what I am saying is true, and then again there is the fact that I actually do a massive amount of this, which gives me the added edge of knowing for sure. See Bennett and Elliot for some discussion of the "window", and other important issues of ogygen , inert gas, and deco. Don't pay even the slightest attention to what the agencies say, or the deco weenies. - G On Thu, 23 May 1996, harpaj@ee*.bh*.ac*.uk* (Andrew Harp) wrote: >I know this may be a dumb question, but... >I've checked quite a bit of literature and doing the deco after a long >dive all the information and courses I've seen talk about doing the >6m and 3m stops on 100% O2 (or 80% O2, 20% N2 as a bit of a buffer at >the 6m stop). Now, with respect to the few O2 hits I've seen reported >on these stops and the hammering it gives your system, why dont more >people use something like a mix of argox (sp ?) or neox - like a 20% >O2, balance inert gas, for the deco stops. It seems like this would >give you the same tissue gradients for off-gassing the nitrogen and >helium as pure O2, with little increase in the deco requirements (or >is that wrong). Does O2 give some metabolic advantages as well ? > >Cheers, >Andy. >-- >Send mail for the `techdiver' mailing list to `techdiver@terra.net'. >Send subscription/archive requests to `techdiver-request@terra.net'. > >
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