5:15 PM - 6:45 PM
[MIS05-P01] Toward quantitative measurement by XRF core scanner (ITRAX) in KCC: the Japan Sea sediment standard sample measurement
Keywords:XRF core scanner, ITRAX, Kochi Core Center (KCC), The Japan Sea, quantitative measurement, measurement precision
The X-ray fluorescence (XRF) core scanner, which facilitates non-destructive, high-speed, and high spatial resolution measurements, has recently been extensively used to measure element variability in sediment (Rothwell and Croudace, 2015). The ITRAX installed at Kochi Core Center (KCC) also produce various research results during last decades (e.g. Seki et al., 2019, Dunlea et al., 2020, Mondal et al., 2021, Kuwae et al., 2022).
However, a quantitative analysis method using results obtained with the XRF core scanner needs a lot of time and effort (Weltje et al. 2015), and XRF core scanner was usually used as a semi-quantitative tool in numerous studies (e.g. Hsiung et al., 2021). Although the element peak area count ratios are most commonly used to report the results of XRF core scanners, identifying the precision and concentration of the elements in their results is essential to elucidating the variations recorded in the sediments.
In this study, we performed standard sample measurements to establish a quantitative analytical method, and provide a database of the X-ray tube aging effect, measurement precision, and calculation equation for each element. The sediment standard samples using the Japan Sea sediment (Dunlea et al., 2020), commercially available sediment standard samples, and reference glass equipped with ITRAX were measured using ITRAX at KCC from 2015 to 2023. The Japan Sea sediment obtained by IODP Exp. 346 and measured by ITRAX were also measured by conventional XRF method. From the results of these measurement, we propose a new method to calculate element concentration from already obtained ITRAX XRF results measured at KCC.
Since ITRAX use non-destructive method, the XRF results is affected by sample surface condition and water content, and S/N ratio is larger than other quantitative method such as XRF and ICP. Although some uncertainty exists, the database and method proposed in this study provide a useful information to all researches that used KCC ITRAX XRF core scanners.
However, a quantitative analysis method using results obtained with the XRF core scanner needs a lot of time and effort (Weltje et al. 2015), and XRF core scanner was usually used as a semi-quantitative tool in numerous studies (e.g. Hsiung et al., 2021). Although the element peak area count ratios are most commonly used to report the results of XRF core scanners, identifying the precision and concentration of the elements in their results is essential to elucidating the variations recorded in the sediments.
In this study, we performed standard sample measurements to establish a quantitative analytical method, and provide a database of the X-ray tube aging effect, measurement precision, and calculation equation for each element. The sediment standard samples using the Japan Sea sediment (Dunlea et al., 2020), commercially available sediment standard samples, and reference glass equipped with ITRAX were measured using ITRAX at KCC from 2015 to 2023. The Japan Sea sediment obtained by IODP Exp. 346 and measured by ITRAX were also measured by conventional XRF method. From the results of these measurement, we propose a new method to calculate element concentration from already obtained ITRAX XRF results measured at KCC.
Since ITRAX use non-destructive method, the XRF results is affected by sample surface condition and water content, and S/N ratio is larger than other quantitative method such as XRF and ICP. Although some uncertainty exists, the database and method proposed in this study provide a useful information to all researches that used KCC ITRAX XRF core scanners.