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    Re: Radium illumination
    From: Marcel Tschudin
    Date: 2010 Sep 8, 14:53 +0300

    It is a very long time ago when I was interested once to find for
    certain substances their lethal volume. I don't remember in detail how
    I proceeded. So please take what I remember with caution. Douglas
    Denny may eventually recognise what I remember wrong and may
    eventually correct/clarify it.
    
    The lethal quantities for poisons are generally given in grams, with
    the density one obtains the volume.
    
    For radioactive material there were two aspects, the lethal
    radioactive dose or/and its property as a poison which depends also on
    the human organ which receives the material.
    
    The most severe of these poisons turned out to be Plutonium where a
    very, very tiny volume was lethal when it reached the most sensitive
    organ.
    
    Tritium was mentioned in the context of marking dials. The tritium gas
    (heavy hydrogen) itself is not so dangerous. However, when it comes
    into the air it produces a vapour of tritium-water which is very, very
    toxic. One sniff of it through your nose is lethal.
    
    The problem is not always the radioactivity of a substance, but also
    its toxicity.
    
    Marcel
    
    
    
    

       
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