Biological Half-life info?

[Grneydminx@aol.com]

Hello, 
    
    I am looking for information on reference materials / web sites etc... 
Specifically info on Biological Half-life's of various Isotopes.  Not 
necessarily just medical isotopes either, but isotopes in general.
    
    Please e-mail me directly, as I do not want to take up Radsafe space with 
any responses I may receive.  

Thank You 
R. Scarborough
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