Some articles on pb, pb ratios:
... Geochron was mainly attributed to Clair Cameron Patterson’s application of Pb-Pb dating on meteorites in 1956 ... The Pb ratios of three stony and two iron meteorites were measured ... thorium, while the crust and mantle would contain higher U/Pb ratios ...
Famous quotes containing the word ratios:
“Typography is not only a technology but is in itself a natural resource or staple, like cotton or timber or radio; and, like any staple, it shapes not only private sense ratios but also patterns of communal interdependence.”
—Marshall McLuhan (19111980)