Does anyone have some ballpark numbers on the average concentration of radium-226 and radium-228 in typical uranium mill tailings? (In pCi/g)? Thanks. Barbara Hamrick BLHamrick@aol.com ************************************************************************ The RADSAFE Frequently Asked Questions list, archives and subscription information can be accessed at http://www.ehs.uiuc.edu/~rad/radsafe.html