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Medientyp:
E-Artikel
Titel:
Hannover Radiocarbon Measurements III
Beteiligte:
Geyh, Mebus A.;
Schneekloth, Heinrich
Erschienen:
Cambridge University Press (CUP), 1964
Erschienen in:Radiocarbon
Sprache:
Englisch
DOI:
10.1017/s0033822200010729
ISSN:
0033-8222;
1945-5755
Entstehung:
Anmerkungen:
Beschreibung:
<jats:p>The following list covers the measurements in our institute from January 1962 to March 1963. Sample preparation and conversion into acetylene are described by Wendt, Schneekloth and Budde (1962).</jats:p><jats:p>An Oeschger counter with an effective volume of 1.5 L came into operation in 1962. It is shielded by 4 cm of iron and 10 cm of lead. The background amounts to 2.24 cpm, the standard C<jats:sup>14</jats:sup> counting-rate 17.05 cpm. In routine measurements, the impure acetylene, after a four-week storing period, is put into the counters. Examination of purity of the gas is carried out by means of an external Cs<jats:sup>137</jats:sup> source. In case the gas shows bad plateau characteristics, it is converted by a new process into ethane, using H<jats:sub>2</jats:sub> and a palladium catalyst. Thereby, the plateau characteristics improve considerably. The 50%-voltage then is 200 v lower, the slope of the plateau only amounts to 0.2 %/100 v (with external source), and the plateau length increases from 600 v to 1200 v. The additional work amounts to 1/2 hour.</jats:p>