北美XRF仪器的精细标定

今天读了一点北美的资料, Raphael A.J. Wust and Xiaojun Cui两位作者的文章,From X-Ray Fluorescence (XRF) to Mechanical Profiling for Better Well Completion. Valuable Analytics for the Exploration Toolbox!,论文在这里

原来北美也做过类似事情,而且手笔更大!

对比仪器:

现场也是能量色散型仪器,Bruker Tracer IV ED-XRF instrument (energy-dispersive XRF) with a Rh target and 50 kV tube and a Silicon Drift Detector (SDD, XFlash®) was used, which detects elements between Na and U.

实验室波长色散型仪器,Bruker S8 TIGER WD-XRF (wavelength-dispersive XRF) 4 kW instrument with a Rh x-ray tube, 60 kV, HighSense detectors and specialized and application-calibrated GeoQuant-M and GeoQuant-T programs (for majors and traces) were used to analyze these samples.注意一下,主量元素和痕量元素的标定程序是不同的!!!

XRD仪器,Bruker D4 Endeavor instrument equipped with a Co X-ray tube (40 kV, 40 mA) and a Lynx-Eye detector. The scan range spanned 3-70° 2Theta.

标准物质:USGS shale standards SBC-1 and SGR-1b

都是Bruker的,这下好了,用你家的WD-XRF、ED-XRF和XRD测量同样的样品,一定得给出一个满意的结果。

当然更恐怖的是样品数量,做了1400m岩心,仅仅是用来做XRF标定的样品数量就超过450个,确保XRF的分析结果可靠!

在建立XRF计算矿物模型的时候,使用了600个样品的数据库来标定。

文章里反复强调要准确标定,果然,数量是基础!

标定是XRF的硬伤,看来我们的感受是对的。

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