X-Message-Number: 28467
Date: Tue, 19 Sep 2006 21:09:05 -0400
From: Francois <>
Subject: Time limit on cryonic preservation?

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Lets assume we have a functionally perfect vitrification and cryonic 
preservation procedure. By that I mean that it causes no additional damage to 
the preserved organs, even down at the molecular level. The bodies prepared with
this technique are stored in liquid nitrogen, which effectively stops all 
chemical interractions within their tissues. In principle, they would be 
preserved forever, provided that the supply of liquid nitrogen is reliably 
maintained. But, would they in fact be preserved indefitely?


We all exist in a mildly radioactive environment. Our very bodies contain 
radioactive isotopes, most notably carbon 14 and potassium 40. Radioactive 
material occurs in small amounts in the soil and many of the rocks that make up 
the ground we walk on. Cosmic rays are always bombarding us from the depths of 
space. All of this adds up to a small but not insignificant annual dose of 
radiation. Life has evolved ways to cope with this, but the preserved bodies in 
their cryogenic storage have no way to repair the damage caused by this 
radiation. It will therefore slowly accumulate, eventually making reanimation 
impossible. Has any estimate been made of how much time it would take to reach 
that stage? If this time is measured in millions of years, then it could be 
safely ignored, I don't think it will take that long to invent the technology 
needed for reanimating a preserved person. If, however, that time is measured in
mere centuries, then it does become a matter of great concern.

Francois
Good health is merely the slowest
possible rate at which one can die.


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