15155
Author
Srdoc, Dusan; Obelic, Bogomil; Horvatincic, Nada
Title Of Article Chaper
Radiocarbon dating of millimole-sized gaseous samples
Title Of Journal Book
Radiocarbon
Volume
25
Issue
2
Pages
485-492
Collation
2 tables, 3 figs., 4 refs.
Literature Type
Serial
Literature Level
Analytic
Abstract
As an alternative to the accelerator technique, a simple, compact, small counter system has been developed and tested for routine carbon-14 dating. This small counter is an all-metal design made of the OFHC copper with quartz supports for the 25mum stainless steel anode. 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 carbon dioxide gave lower background counting rate, and it was easier to prepare and to handle. The long term run using CH<sub>4</sub> showed that the gas gain remained stable within one to two percent for months after the initial drop which followed the counter filling. A seven-day counting period was sufficient to achieve a three percent relative standard deviation which was considered acceptable for routine dating of younger samples. -- AATA
Keywords
Dating Radiocarbon Gas counter;Gas Gain Stability AATA
pub_id
15155