My new Amer. Min. article on improving sensitivity in EPMA is out:
http://ammin.geoscienceworld.org/content/gsammin/101/8/1839.full.pdf
john
I've got a link for downloading my new Amer. Min. paper as a pdf here:
http://epmalab.uoregon.edu/publ/A%20new%20EPMA%20method%20for%20fast%20trace%20element%20analysis%20in%20simple%20matrices.pdf
john