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To: rnairne@sy*.DI*.oz*.au* (Rodney Nairne)
Subject: Re: Final decompression gas choice?
From: story@be*.en*.sg*.co* (David Story)
Cc: chris@de*.de*.co*.uk*
Cc: techdiver@opal.com
Date: Tue, 18 Apr 1995 12:07:47 -0700 (PDT)

Rodney Nairne writes:
> 
> Chris,
>   The 1991 NOAA tests had some interesting results. Apparently,  a convulsion
>occured on mixed gas after 40mins at a po2 of 1.6. For pure oxygen, the lowest
> po2 to produce a convultion was 1.76 ata.
:
> BTW, one highly respected doctor stated that the probability of a convulsion
> for divers at 9mtrs on 02 was 1 in 12000. Durations/prior exposures were not
> mentioned.

I strongly recommend that folks read Dr. Kenneth Donald's _Oxygen and
the Diver_ which goes into great (and interesting) detail on the
oxygen breathing programs of the US Navy, Royal Navy, and others.  

In it he gives a convincing picture of the unpredictability of CNS O2
toxicity, and the routine predictability of pulmonary O2 toxicity.

I'd go so far as to say "don't dive pure O2 without reading that book!"
It's not too expensive, either, only around US$40 from Best Publishing.

Cheers,

David Story                        	        Silicon Graphics, Inc.
story@sg*.co*					Mountain View, California

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