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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Characterization of materials embedded in thick objects using spectral small-angle x-ray scattering
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Characterization of materials embedded in thick objects using spectral small-angle x-ray scattering

机译：使用光谱小角X射线散射嵌入在厚物体中的材料的特征

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Small-angle x-ray scattering (SAXS) can identify a material based on its scattering features. However, SAXS techniques have been limited to the study of thin samples in the mm scale. We investigated the use of spectral SAXS (sSAXS) in the 30-45 keV energy range to identify embedded materials in up to 5 cm thick objects. A prototype sSAXS system was built by integrating a polychromatic x-ray source and a 2D spectroscopic detector in a two-pinhole collimation setup. The elastically scattered x-rays at deflection angles smaller than 10 degrees were measured without collimating the scattered rays or filtering the energy spectrum. Using caffeine as a target material in 1 to 5 cm polymethyl methacrylate (PMMA) slabs, we demonstrate the capability of sSAXS technique to identify caffeine targets in all cases with 600 s acquisition times. The distinct Bragg peaks of caffeine at 8.44 and 18.64 nm(-1) were recovered with a q-resolution of 0.6 nm(-1) after attenuation and background corrections. Furthermore, we show the effect of PMMA thickness and target location to estimate the caffeine amount from the recovered signal using area-under-the-peak (AUP) analysis. We found that AUPs were slightly overestimated due to signal contamination by PMMA when the scattered photons from the caffeine target traverse through 1 to 3 cm PMMA slabs. This effect was more significant in the 5 cm thick PMMA with an average transmission factor of 24%, where the AUP was overestimated approximately by 34%.
机译：小角度X射线散射（萨克斯）可以基于其散射特征识别材料。然而，SAXS技术仅限于MM规模中的薄样本的研究。我们调查了在30-45keV能量范围内使用光谱纱氏（SSSAX），以识别嵌入式材料，最多5厘米厚的物体。通过将多色X射线源和2D光谱检测器集成在双针孔准直设置上来构建原型SSAX系统。测量偏转角处的弹性散射的X射线，而不在不准直的散射光线或过滤能谱的情况下进行测量。使用咖啡因作为甲基丙烯酸甲酯（PMMA）板的1至5cm的靶材料，我们证明了SSAXS技术在所有情况下鉴定了600次采集时间的咖啡因靶标的能力。在衰减和背景校正后，用0.6nm（-1）的Q分辨率回收8.44和18.64nm（-1）的咖啡因的明显布拉格峰。此外，我们展示了PMMA厚度和目标位置的效果，以使用峰值（AUP）分析来估计来自回收信号的咖啡因量。我们发现，当来自咖啡因靶的散射光子横移1至3cmmMA板坯时，由于PMMA的信号污染，AUP略微高估。该效果在5cm厚的PMMA中更显着，平均传输因子为24％，其中AUP大约高估了34％。

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