Science: v.1-v.219Moses King, 1966 |
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Стр. 1094
... Lead of the oceanic tholeiites has a varying lead - 206 : lead - 204 ratio between 17.8 and 18.8 , while leads of the alkali basalt suites from Easter Island and Guadalupe Island are very radiogenic with lead - 206 : lead - 204 ratios ...
... Lead of the oceanic tholeiites has a varying lead - 206 : lead - 204 ratio between 17.8 and 18.8 , while leads of the alkali basalt suites from Easter Island and Guadalupe Island are very radiogenic with lead - 206 : lead - 204 ratios ...
Стр. 1095
... lead content . An un- crushed block sample ( ~ 40 g ) was placed in a graphite crucible and heated to 1250 ° C in a vacuum . All samples melted at around 1100 ° to 1150 ° C , and more than 90 percent of the lead was usually recovered ...
... lead content . An un- crushed block sample ( ~ 40 g ) was placed in a graphite crucible and heated to 1250 ° C in a vacuum . All samples melted at around 1100 ° to 1150 ° C , and more than 90 percent of the lead was usually recovered ...
Стр. 1097
... lead are shown as a conven- ient frame of reference ( 18 ) . The μ and K are the conventional means of indicat- ing the atomic ratios of U238 / Pb204 and Th232 / U238 today , as calculated from the lead isotopes . The and indicate the ...
... lead are shown as a conven- ient frame of reference ( 18 ) . The μ and K are the conventional means of indicat- ing the atomic ratios of U238 / Pb204 and Th232 / U238 today , as calculated from the lead isotopes . The and indicate the ...
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Vol 153 No | 808 |
153 | 814 |
Cylindrical Inclusions in the Cytoplasm of Leaf Cells Infected with Tobacco | 883 |
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