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Confocal three‐dimensional micro‐X‐ray fluorescence (3D‐μXRF) spectroscopy based on laboratory X‐ray tube was employed to unravel the three‐dimensional (3D) distribution of metal element (Fe) inner the paper. According the distribution of the Fe in the paper, the information covered in the printed paper could be retrieved. Before the experiment, the performance of the confocal 3D‐μXRF setup was described...
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