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The results described herein are measurements performed in 1961. Sample preparation and conversion into acetylene have been described (Wendt, Schneekloth and Budde, 1962). In calculating errors we did not follow the procedure used in our Date List I, where only the standard deviations of counting rates were used. The errors attached to the dates listed below include systematic errors due to sample preparation and small changes in the counting characteristics of sample, background, and standard counting gas.
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). 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 14 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 137 source. In case the gas shows bad plateau characteristics, it is converted by a new process into ethane, using H 2 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.
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