Re: chemical question

[don@radpro.uchicago.edu]

The specific activity given by another responder is probably for U natural or 
Th natural.  If the bottles are really old, a significant amount of daughters 
may have grown back in, so the activity will be much higher.  Also note that 
radon is in the decay series of both, so you want to keep the bottles well 
sealed to prevent radon daughters from plating out on the surroundings.

___________________________________________________________________

Don Jordan                          Tel. (312) 702-6299
Office of Radiation Safety          Fax        702-4008
The University of Chicago           email: don@radpro.uchicago.edu
1101 East 57th Street, Room 11
Chicago, Illinois  60637  
                -- Any opinions are the author's --