Uranium Contents of Ancient Man-Made Glass

See allHide authors and affiliations

Science  15 May 1964:
Vol. 144, Issue 3620, pp. 841-842
DOI: 10.1126/science.144.3620.841


The concentrations of uranium impurities in a variety of ancient man-made glasses have been determined by counting the sites of neutron-induced fissions. There appears to be a chronological trend from low to high and back to low uranium contents over the past three millennia. Crude estimates of ages by fission-track counting should be possiblewith considerable labor for the group of glasses which was found to have the highest concentration of uranium.