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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/40389

Title: Choosing optimal exposure times for XRF core-scanning: suggestions based on 2 the analysis of geological reference materials
Authors: Kuo-Yen Wei
Jyh-Jaan Huang
Ludvig Löwemark
Queenie Chang
Tzu-Yu Lin
Huei-Fen Chen
Sheng-Rong Song
Contributors: 國立臺灣海洋大學:應用地球科學研究所
Date: 2016-03
Issue Date: 2017-01-18T03:47:09Z
Publisher: Geochemistry Geophysics Geosystems
Abstract: Abstract: X-ray fluorescence (XRF) core-scanning is a fast and nondestructive technique to assess elemental variations of unprocessed sediments. However, although the exposure time of XRF-scanning directly affects the scanning counts and total measurement time, only a few studies have considered the influence of exposure time during the scan. How to select an optimal exposure time to achieve reliable results and reduce the total measurement time is an important issue. To address this question, six geological reference materials from the Geological Survey of Japan (JLK-1, JMS-1, JMS-2, JSD-1, JSD-2, and JSD-3) were scanned by the Itrax-XRF core scanner using the Mo- and the Cr-tube with different exposure times to allow a comparison of scanning counts with absolute concentrations. The regression lines and correlation coefficients of elements that are generally used in paleoenvironmental studies were examined for the different exposure times and X-ray tubes. The results show that for those elements with relatively high concentrations or high detectability, the correlation coefficients are higher than 0.90 for all exposure times. In contrast, for the low detectability or low concentration elements, the correlation coefficients are relatively low, and improve little with increased exposure time. Therefore, we suggest that the influence of different exposure times is insignificant for the accuracy of the measurements. Thus, caution must be taken when interpreting the results of elements with low detectability, even when the exposure times are long and scanning counts are reasonably high.
Relation: 17(4)
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/40389
Appears in Collections:[應用地球科學研究所] 期刊論文

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