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Radiocarbon Dating with Liquid CO2as Diluent in a Scintillation Solution

 

作者: G. W. Barendsen,  

 

期刊: Review of Scientific Instruments  (AIP Available online 1957)
卷期: Volume 28, issue 6  

页码: 430-432

 

ISSN:0034-6748

 

年代: 1957

 

DOI:10.1063/1.1715899

 

出版商: AIP

 

数据来源: AIP

 

摘要:

The use of the scintillation technique for radiocarbon dating has until now been retarded by the difficulties encountered in the chemical procedure. This paper shows it to be feasible to use the carbon dioxide obtained by combustion of the sample, without any further chemical conversion, as a diluent in a scintillation solution. Up to 80% by weight and possibly more liquid carbon dioxide can be dissolved in toluene+5 g/l diphenyloxazole (PPO). However, the presence of CO2in the scintillator interferes somewhat with the light emission in such a way that the decrease in pulse height, as compared with pure toluene+5 g/l PPO, is 50% for 20% by weight dissolved CO2. This limits the percentage of CO2that can be used effectively to about 30%.The counting rate due to modern carbon is 9.1 c/min, and the background is 15.5 c/min. Measurements indicate however that both these figures can be improved considerably, so as to make this technique at least comparable with the gas‐counting technique.

 

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