Author:
Srdoč Dušan,Obelić Bogomil,Horvatinčić Nada
Abstract
As an alternative to the accelerator technique, a simple, compact, small counter system has been developed and tested for routine 14C dating. Our small counter is an all-metal design made of the OFHC copper with quartz supports for the anode (25μm stainless steel). Careful selection of materials for the counter construction was made based on the measurements of the alpha contamination. Methane as the counter filling gave better resolution and gas gain stability, whereas CO2 gave lower background counting rate and it was easier to prepare and to handle. The long term run using CH4 showed that the gas gain remained stable within 1–2% for months after the initial drop which followed the counter filling. A 7-day counting period was sufficient to achieve a 3% relative standard deviation which was considered acceptable for routine dating of younger samples.
Publisher
Cambridge University Press (CUP)
Subject
General Earth and Planetary Sciences,Archaeology
Reference4 articles.
1. Srdoč D , in press, Surface emission of alpha particles from materials used in low-level radioactivity technique, in Internatl conf on low-level activity measurements and applications, 2nd Proc: High Tatras, Czechoslovakia.
2. Mini-Radiocarbon Measurements, Chemical Selectivity, and the Impact of Man on Environmental Pollution and Climate
3. Carbon dioxide proportional counters: Effects of gaseous impurities and gas purification methods
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