GeoPIXE element maps of sample GQ1943_3

A series of element maps collected using the Maia 384 detector array on the XFM beamline at the Australian Synchrotron. Maps are both single element images and RGB composites (indicated by file name). Lower resolution versions of these files form part of a figure 1 in a paper on the application of the Maia mapping technique and are made available here to allow the full resolution images (1:1 binning of pixels) to be accessed.\nLineage: X-ray spectra were collected using the Maia 384 detector on the XFM beamline at the Australian Synchrotron. The spectral data were collected with an incident beam energy of 18.5 keV, a pixel size of 4 µm and dwell times per pixel of 0.97 msec. The Maia XFM full spectral data were analysed using the GeoPIXE software suite which uses a fundamental parameters approach, with spectral deconvolution and imaging using the Dynamic Analysis method based on fitting a representative total spectrum, and a detailed model of Maia detector array efficiency. Spectra are fitted using a X-ray line relative intensities that reflect integration of yields and X-ray self-absorption effects for the given matrix or mineral phase and the contrasting efficiency characteristics across the detector array. The result is a matrix transformation that allows projection of the full-spectral data into element maps in this collection.

本数据集包含一系列元素分布图，均采用澳大利亚同步加速器（Australian Synchrotron）XFM光束线（XFM beamline）的Maia 384探测器阵列（Maia 384 detector array）采集而成。这些图像涵盖单元素图像与RGB合成图像（RGB composites，文件名可体现图像类型）。其中低分辨率版本为一篇关于Maia绘图技术应用的论文中图1的组成部分，本次公开的完整分辨率图像（像素1:1合并）可供用户获取。
数据溯源：X射线能谱通过澳大利亚同步加速器XFM光束线的Maia 384探测器阵列采集，采集参数为入射束能量18.5 keV、像素尺寸4 µm、单像素驻留时间0.97毫秒。Maia XFM全谱数据采用GeoPIXE软件套件（GeoPIXE software suite）进行分析，该套件采用基础参数法，基于拟合代表性总能谱以及Maia探测器阵列效率的详细模型，通过动态分析方法（Dynamic Analysis method）完成能谱解卷积与成像。能谱拟合采用X射线谱线相对强度，该强度反映了给定基质或矿物相的产额积分与X射线自吸收效应，同时兼顾探测器阵列的效率差异特性。最终通过矩阵变换将全谱数据投影为本数据集所收录的元素分布图。