Author:Vogel, JCDate:1938The high capital cost of coal hydrogenation plant makes it essential that oil output be maintained at high level as possible as this factor must primarily govern the choice of the coal to be used or the decision as to whether as coal is ...Read more
Author:Vogel, JCDate:Mar 2002Cosmic ray production of the radioactive carbon isotope C-14, which is the basis for the radiocarbon dating method, has not remained constant over time. The result is that radiocarbon dates show significant deviations from the true age. The ...Read more
Author:Vogel, JC; Visser, E; Fuls, ADate:2001Ostrich eggshell from archaeological sites remains largely free of more recent carbon contamination and as such is suitable material for radiocarbon dating. The carbonate fraction of the shell does, however, display an initial deficit in C14, ...Read more