Below is the a paper that provides the details of looking for dinosaurs with a gamma scintillator.
Jones, R.R. and Chure, D.J., 1998. The recapitation of a Late
Jurassic theropod dinosaur. GAIA: revista de geociências, (15), p.103-110.
http://www.arca.museus.ul.pt/ArcaSite/obj/gaia/MNHNL-0000774-MG-DOC-web.PDF
Other publications
Jones, R.D. and Burge, D., 1995, January. Radiological surveying
as a method for mapping dinosaur bone sites. In Journal of
Vertebrate Paleontology (Vol. 15, suppl. 3, pp. 38A-38A)
Yours,
Paul H.