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On Fri, 21 Apr 1995, Richard Pyle wrote: > > 200' on air for 20 minutes. > > > > With 100% O2, total dive is 44minutes, 26.9% CNS dose. > > With 80% O2, total dive is 43minutes, 24.0% CNS dose. > > > > 200' on air for 20 minutes, 40% O2 in travel bottle > > > > With 100% O2, total dive is 41minutes, 28.5% CNS dose. > > With 80% O2, total dive is 41minutes, 25.2% CNS dose. > > > > Looks like a definate WIN for 80%. Less deco time, less O2 dose. > > Lemme get this straight: The profiles compare 80% O2 at 30, 20, and 10 > foot stops with 100% O2 at 20 and 10-foot stops. If that's the case, then > I see 100% O2 as the winner. My logic is this: it appears as though the > Maximum PO2 partial pressure exposure is essentially the same for both > (1.6), and the decompression times and CNS "dose" are essentially > identical (the differences you list are physiologically meaningless). > Oxygen is the winner, then, because you don't have to deal with mixing > compressor-air with high-pressure pure Oxygen. (i.e., you don't have the > risks and costs associated with blending Nitrox-80). Ok, then once again we find that there often isn't a single solution. In your case, 100% O2 makes perfect sense, it's the hands-down winner. Since I don't mix my own gas, and it costs me the same to get 80% or 100%, I'll stick with 80%. -Eric ----------------------------------------------------------------------- Eric Lundquist, Systems Manager School of Oceanography, Box 357940 ericl@oc*.wa*.ed* University of Washington (206) 543-0594 102 ORB Seattle, WA, USA 98195-7940 http://www.ocean.washington.edu/people/staff/ericl/ ----------------------------------------------------------------------- Check out my Puget Sound area scuba diving WWW page! http://diver.ocean.washington.edu
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