| Autor: |
De Neve, K., Strijckmans, K., Vandeputte, K., Dams, R. |
| Zdroj: |
Journal of Radioanalytical and Nuclear Chemistry; July 1997, Vol. 221 Issue: 1-2 p79-83, 5p |
| Abstrakt: |
Abstract: In the14C-dating by accelerator mass spectrometry (AMS) iron and copper oxide are used during sample preparation. In an investigation on the origin of the14C-blank, which in practice determines the dating limit of AMS, the carbon contamination was measured in both reagents by deuteron activation analysis via the12C(d,n)13N reaction. A first batch of iron was analysed radiochemically and a carbon concentration of 37.6 mgrg/g was found with a standard deviation of 2.7 mgrg/g (3 analyses). In a second batch of iron concentrations between 66 and 150 mgrg/g were found for 6 instrumental analyses, suggesting an inhomogeneous distribution of carbon. The carbon content in copper oxide was 17.8 (3.5) mgrg/g for 3 instrumental analyses, but preference should be given to a radiochemical analysis. These figures indicate that the carbon impurities found in iron and copper oxide are possible causes of the14C-blank. However, a final conclusion can only be drawn if the14C concentration of the contaminating carbon and the amount of carbon released during sample preparation are known. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
|
Full text from SpringerLink