Experiences with XRF-Scanning of Long Sediment Records

Experiences with XRF-Scanning of Long Sediment Records
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对长沉积物记录进行 XRF 扫描的经验

DOI:
10.1007/978-94-017-9849-5_13
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发表时间:
2015
期刊:
影响因子:
--
通讯作者:
Enters D.
Enters D.
中科院分区:
--
文献类型:
--
作者:
Ohlendorf;Wennrich V;Enters D.

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用ITRAX XRF岩心扫描仪分析了在两个深钻项目(PASADO和El'gygytgyn)框架内获得的100多米长的湖相沉积物序列。岩心长度和这些记录的300-8000小时的长的总扫描时间使得有必要考虑下岩心岩性变化和管老化。为了解释这些,实现了两种不同的方法来通过XRF扫描获取元素数据。此外,X射线管老化记录的标准参考玻璃定期测量后,每次核心运行。所获得的数据表明,由于几个原因,XRF原始数据的标准化是可取的。(1)为了消除观察到的导致计数率降低从而降低元素强度的初级管功率长期下降的影响。(2)为了使使用不同X射线管电流设置测量的切片之间的元素轮廓偏移保持水平。从测试的归一化程序,由相干辐射(coh)的强度划分的元素原始强度产生了最好的结果与中高原子序数的元素。然而,具有低原子序数的元素较少受到与管老化相关的计数率降低的影响,因此,coh校正可能过度补偿这些元素。因此,对于轻元素,通过计算具有可比原子序数的元素的比率(例如Si/Ti)来校正表观能量损失是有利的。
Lacustrine sediment sequences of more than 100 m in length obtained in the framework of two deep drilling projects (PASADO and El’gygytgyn) were analysed with ITRAX XRF-core scanners. Core length and the long total scan time of 300–8000 h for these records made it necessary to consider downcore lithological changes and tube ageing. To account for these, two different approaches were realised for the acquisition of element data by XRF-scanning. Additionally, X-ray tube ageing was documented by regular measurements of a standard reference glass after each core run. The data obtained suggest that a normalisation of XRF raw-data is advisable for several reasons. (1) To level out effects of the observed long-term decrease in primary tube power that lead to lower count rates and thus lower element intensities. (2) To level out shifts in element profiles between sections that were measured with different X-ray tube current settings. From the tested normalisation procedures a division of element raw intensities by the intensity of coherent radiation (coh) yielded the best results for elements with mid to high atomic numbers. However, elements with low atomic numbers are less affected by a lowering of count rates related to tube ageing, and thus, the coh correction might over-compensate for this for these elements. Thus, for light elements it is advantageous to correct for the apparent energy loss by calculating ratios of elements with comparable atomic numbers (e.g. Si/Ti).
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