University of Rome Carbon-14 Dates XIV

This list includes dates measured from January 1974 to June 1975 with previously described CO 2 proportional counters (Alessio et al , 1970b). All archaeologic and geologic samples except for Arslantepe series come from Italian territory. Chemical apparatus for CO 2 preparation and purification is unchanged (Alessio et al , 1970b). Data recording devices have recently been replaced with integrated circuits built entirely at the Lab. The logic of the circuitry was also modified to provide more stable devices and a higher relative figure of merit A/√B of each counter (A = net activity of modern standard, B = background). Consequently, the resolution of age measurements has increased appreciably. Present values of A/√B for the 4 counters in use are shown in Table 1.