I've got a full-time job http://ileniafc.altervista.org/phpBB2/profile.php?mode=viewprofile&u=47055 mofosnetwork The dating technique required the use of a specializedinstrument called a secondary ionization mass spectrometer or SIMS, of which onlythree exist in North America, Chamberlain says. The instrument analyzes a mineralsample by excavating microscopic pits (about 1 micron deep by 20 microns indiameter) in the rock sample and analyzing the isotopic compositions of the excavatedmaterial. For scale, the diameter of a human hair is roughly 100 microns,Chamberlain says.