A hunting we will go!

["David Levy" <david.levy@fernald.gov>]

     Folks,
     
     For the sake of an excavation/remediation project, we are assuming 
     that there are 360 pounds of Th-232 buried in a waste pit full of 
     other contaminants.  We don't know exactly where in the pit this 
     material is or quite how deep.  What we do know is that it may be 
     pyrophoric and, we suspect, it is concentrated in one location.
     
     We would like to find this material before it finds us.  We're 
     thinking of using gamma spectroscopy to search for the Ac-228 .991 MeV 
     gammas.
     
     Any advice?  Thanks in advance!
     
     David Levy
     Health Physicist
     david.levy@fernald.gov
     (513) 648-3816