A Multi-Counter System for High Precision Carbon-14 Measurements

Hildegard Schoch; Michael Bruns; Karl Otto Münnich; Marianne Münnich

doi:10.1017/S0033822200009747

Abstract

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A new 14C detector system containing nine, independently working, CO2 proportional counters is described. The system is designed for a sufficient measuring capacity at a precision level better than σ = ± 2‰, which requires a counting time of about one week per sample. The size of the installation requires a simple and economic design of counters and electronics. A single anticoincidence shield for all counters consists of five newly developed flat counters. The modern counting rate (52cpm) is sensitively checked by running Heidelberg sodium carbonate standard samples wth a counting rate of about 10 times modern. A microcomputer (DEC PDP-11 /03) is used for data acquisition. Recent developments in laboratory techniques (preparation and gaschromatographic purification of samples) are also reported.

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A Multi-Counter System for High Precision Carbon-14 Measurements

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