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Washington State University Natural Radiocarbon Measurements II

This list of radiocarbon age measurements is for the period 1972–1974. Most of the samples are of archaeologic interest. The pretreatments of samples used are basically those described by Ralph and Michael (1971). All samples were converted to methane using the method developed by Fairhall, Schell, and Takashima (1961) and counted in .5L counting tubes at 2 to 4atm of pressure. The WSU Radiocarbon Laboratory has been relocated to the basement of Dana Hall (three stories) and additional shielding has been added. The backgrounds of the counting tubes are .90 counts/min and have an atmospheric pressure dependence of –.035 counts/min/cm Hg.