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thorium abundance?



Does anyone know where I can find the values of the naturally-occurring
isotopic abundances of thorium?  

Thanks in advance!

-- 
Melissa Woo                       | University of Illinois at Urbana-Champaign
Health Physicist                  | Environmental Health & Safety Bldg., MC225
office phone: 1.217.244.7233      | 101 S. Gregory St., Urbana, IL  61801
m-woo@uiuc.edu                    | http://www.cso.uiuc.edu/ph/www/m-woo