Glasgow University Radiocarbon Measurements VI

Abstract

The following list presents results obtained during 1970-1971 and is a continuation of research of which data have been pub. previously (Baxter et al. , 1969; Ergin et al. , 1970; Baxter and Walton, 1970; Harkness and Walton, 1972; Ergin et al. , 1972). The major research efforts at Glasgow are aimed at evaluation of (a) natural annual C 14 levels and (b) burdens and residence times of artificial C 14 in the environment and human tissues. The results of these studies are presented as δC 14 and Δ values based on age-corrected activities, although this correction is very small. The errors quoted are counting uncertainties only, expressed at the 1 σ level. Pretreatment procedures are outlined in the text and analytical methods are essentially unchanged. Gas proportional counting of both CO 2 and CH 4 is employed in 2.6L and 0.5L detectors, respectively. Mass spectrometric analyses are performed to a precision of 0.1‰ (± 2 σ ) on a V.G. Micromass 602B stable isotope mass spectrometer.