Search Results
You are looking at 31 - 32 of 32 items for :
- Author or Editor: A. De Wispelaere x
- Chemistry and Chemical Engineering x
- Refine by Access: All Content x
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 k 0-based epiCd-NAA (ENAA, with irradiation under a cadmium cover) when applied to sediments is compared to k 0-NAA. As concluded, with the use of k 0-ENAA the analysis turnaround time could be considerably reduced from ~3 weeks to ~ 2.5days, while maintaining satisfactory accuracy, precision and determination sensitivity.
