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>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*
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