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La Jolla Natural Radiocarbon Measurements VII

Published online by Cambridge University Press:  18 July 2016

T W Linick
T W Linick*
Affiliation:
Mt Soledad Radiocarbon Laboratory, Department of Chemistry University of California, San Diego, La Jolla, California 92093
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Radiocarbon dating of many types of samples has continued at the La Jolla Radiocarbon Laboratory since the last date list was published (Bien and Pandolfi, 1972). Since the 1969 relocation of the laboratory to its present location on Mt Soledad, at least 5 low-level 14C systems have generally been in operation. The laboratory has continued to employ acetylene gas proportional counting. Samples were usually measured for 2 to 3 days in each of 2 different detectors. The properties of the 5 counters used in the measurements of samples are as follows (background and net standard counts per minute, respectively, with acetylene of 900mmHg pressure are given in parentheses): 1) Bern counter: Oeschger-type counter-guard ring unit with 1.7L sensitive center volume (2.1, 21.5), 2) MBLE counter: Oeschger-type counter-guard ring unit with 1.6L center volume (1.3, 17.4), 3) 1L counter with separate Q-gas flow guard ring (4.2, 12.9), 4) 0.4L counter with separate guard ring (1.2, 4.2), and 0.1L counter with separate guard ring (0.7, 1.2).

Type
Research Article
Information
Radiocarbon , Volume 19 , Issue 1 , 1977 , pp. 19 - 48
Copyright
Copyright © The American Journal of Science 

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