Non-Destructive Study of Bulk Crystallinity and Elemental Composition of Natural Gold Single Crystal Samples by Energy-Resolved Neutron Imaging.
Non-Destructive Study of Bulk Crystallinity and Elemental Composition of Natural Gold Single Crystal Samples by Energy-Resolved Neutron Imaging.
复制标题
通过能量分辨中子成像对天然金单晶样品的块体结晶度和元素组成进行无损研究。
DOI：
10.1038/srep40759
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发表时间：
2017-01-19
影响因子：
4.6
通讯作者：
Vogel SC
中科院分区：
文献类型：
--
作者：
Tremsin AS;Rakovan J;Shinohara T;Kockelmann W;Losko AS;Vogel SC
能量分辨中子成像使得能够对体结构和元素组成进行非破坏性分析，由于中子计数探测器的最新发展和改进，这可以在明亮的脉冲中子源处以高空间分辨率来分辨。这种技术，适用于许多应用，在这里演示了一个特定的研究~5-10毫米厚的天然金样品。通过对中子吸收共振的分析，绘制了钯（平均元素浓度为~0.4原子%和~5原子%）在金样品中的空间分布图。在同一时间，在热和冷能制度的相干中子散射的分析揭示了样品具有单晶体结构，通过整个样品体积。空间分辨分析是可能的，因为中子透射谱同时测量在超热，热和冷能量范围内的每个探测器像素。在像素尺寸为55 μm，探测器面积为512 × 512像素的情况下，共同时测量了262，144个中子透射谱。我们的实验结果表明，高分辨率能量分辨中子成像是一个非常有吸引力的分析技术的情况下，其他传统的非破坏性的方法是无效的，由于样品的不透明性。
Energy-resolved neutron imaging enables non-destructive analyses of bulk structure and elemental composition, which can be resolved with high spatial resolution at bright pulsed spallation neutron sources due to recent developments and improvements of neutron counting detectors. This technique, suitable for many applications, is demonstrated here with a specific study of ~5–10 mm thick natural gold samples. Through the analysis of neutron absorption resonances the spatial distribution of palladium (with average elemental concentration of ~0.4 atom% and ~5 atom%) is mapped within the gold samples. At the same time, the analysis of coherent neutron scattering in the thermal and cold energy regimes reveals which samples have a single-crystalline bulk structure through the entire sample volume. A spatially resolved analysis is possible because neutron transmission spectra are measured simultaneously on each detector pixel in the epithermal, thermal and cold energy ranges. With a pixel size of 55 μm and a detector-area of 512 by 512 pixels, a total of 262,144 neutron transmission spectra are measured concurrently. The results of our experiments indicate that high resolution energy-resolved neutron imaging is a very attractive analytical technique in cases where other conventional non-destructive methods are ineffective due to sample opacity.