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On Sun, 11 Feb 1996, Michel Therrien wrote: > > >The resetting of the clock in 12 h with a t1/2 of 90 min does not > >follow, assuming that it takes 6 t1/2 to reach 98+% desaturation, as is > >the assumption with N2 offgassing. One would expect that a 9 h > >desaturation would be required to reset with t1/2 = 90. > > > >Comments? > > Magic! > > No, after 6 half-time, you reach approximately 98.6%. However, the math > still apply beyond that percentage. If you apply the formula, you'll never > reach 100% (or in our case, 0% residual CNS). After a 12 hours surface > interval, applying the exponential decay formula, the residual CNS% becomes > 0.39625% (which is assumed to be zero). > > If you check the residual CNS% after a 9 hours SI, it should be 1.5625%. > > However, him not sure it was proved that the CNS% is resetted at an > exponential decay rate. The NOAA guideline is simply to wait 12 hours. > > Michel Therrien > m.therrien@ne*.qc*.ca* > > -- > Send mail for the `techdiver' mailing list to `techdiver@terra.net'. > Send subscription/archive requests to `techdiver-request@terra.net'. > I just want to jump in here and ask what are all these numbers based on and how were they derived? I see debate about a few percent CNS, but shouldn't there be enough saftey margin that this negligable. Especially considering how variable our bodies are not only between people, but between days, conditions, and events. Aloha Tony ANTHONY MONTGOMERY Marine Option Program Waikiki Aquarium 1000 Pope Road MSB #203 2777 Kalakaua Ave Honolulu, Hawaii 96822 Honolulu, Hawaii 96815 Fax: (808) 956-2417 Fax: (808) 923-1771 Phone: (808) 956-6000 Phone: (808) 923-9741
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