View More View Less
  • 1 Laboratory of Analytical Chemistry, Institute for Nuclear Sciences, Ghent University Proeftuinstraat 86, B-9000 Gent, Belgium
  • | 2 Laboratory of Analytical Chemistry, Institute for Nuclear Sciences, Ghent University Proeftuinstraat 86, B-9000 Gent, Belgium
  • | 3 Laboratory of Analytical Chemistry, Institute for Nuclear Sciences, Ghent University Proeftuinstraat 86, B-9000 Gent, Belgium
  • | 4 Laboratory of Analytical Chemistry, Institute for Nuclear Sciences, Ghent University Proeftuinstraat 86, B-9000 Gent, Belgium
  • | 5 Laboratory of Analytical Chemistry, Institute for Nuclear Sciences, Ghent University Proeftuinstraat 86, B-9000 Gent, Belgium
  • | 6 Laboratory for Mineralogy, Petrography and Micropedology, Geological Institute, Ghent University Krijgslaan 281, B-9000 Gent, Belgium
Restricted access

Summary  

Recently, in our laboratory an intercomparison was made of methods for the annual radiation dose determination (assessed from direct radiation counting and/or from the measurement of the K, Th and U contents) applied to luminescence dating of loess and sand sediment, whereby the emphasis was put on their precision and accuracy. Although these properties are important, the duration of the measurement is also a practically relevant aspect. Indeed, direct alpha, beta and gamma-counting can last a week or more, and the determination of K, Th and U via NAA can take up to three weeks to enable proper gamma-ray spectrometry of the long-lived 233 Th/233Pa. Therefore, in the present work the performance of k0-based epiCd-NAA (ENAA, with irradiation under a cadmium cover) when applied to sediments is compared to k0-NAA. As concluded, with the use of k0-ENAA the analysis turnaround time could be considerably reduced from ~3 weeks to ~ 2.5days, while maintaining satisfactory accuracy, precision and determination sensitivity.