New consistency tests for high-accuracy measurements of X-ray mass attenuation coefficients by the X-ray extended-range technique.

IF 1.8 4区材料科学

Acta Crystallographica Section A Pub Date : 2012-03-01 Epub Date: 2012-01-05 DOI:10.1107/S0108767311044990

C T Chantler, M T Islam, N A Rae, C Q Tran, J L Glover, Z Barnea

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引用次数: 12

Abstract

An extension of the X-ray extended-range technique is described for measuring X-ray mass attenuation coefficients by introducing absolute measurement of a number of foils - the multiple independent foil technique. Illustrating the technique with the results of measurements for gold in the 38-50 keV energy range, it is shown that its use enables selection of the most uniform and well defined of available foils, leading to more accurate measurements; it allows one to test the consistency of independently measured absolute values of the mass attenuation coefficient with those obtained by the thickness transfer method; and it tests the linearity of the response of the counter and counting chain throughout the range of X-ray intensities encountered in a given experiment. In light of the results for gold, the strategy to be ideally employed in measuring absolute X-ray mass attenuation coefficients, X-ray absorption fine structure and related quantities is discussed.

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用x射线增程技术高精度测量x射线质量衰减系数的新一致性测试。

介绍了x射线增程技术的一种扩展，通过引入对多个箔片的绝对测量来测量x射线质量衰减系数——多独立箔片技术。用38- 50kev能量范围内的金的测量结果说明了该技术，表明它的使用可以选择最均匀和定义良好的可用箔，从而导致更准确的测量;它允许测试独立测量的质量衰减系数绝对值与厚度传递法获得的绝对值的一致性;它测试计数器和计数链在给定实验中遇到的x射线强度范围内的响应线性度。根据金的实验结果，讨论了测量绝对x射线质量衰减系数、x射线吸收精细结构及相关量的理想策略。

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来源期刊

Acta Crystallographica Section A 化学-晶体学

自引率

11.10%

发文量

审稿时长

3 months

期刊介绍： Acta Crystallographica Section A: Foundations and Advances publishes articles reporting advances in the theory and practice of all areas of crystallography in the broadest sense. As well as traditional crystallography, this includes nanocrystals, metacrystals, amorphous materials, quasicrystals, synchrotron and XFEL studies, coherent scattering, diffraction imaging, time-resolved studies and the structure of strain and defects in materials. The journal has two parts, a rapid-publication Advances section and the traditional Foundations section. Articles for the Advances section are of particularly high value and impact. They receive expedited treatment and may be highlighted by an accompanying scientific commentary article and a press release. Further details are given in the November 2013 Editorial. The central themes of the journal are, on the one hand, experimental and theoretical studies of the properties and arrangements of atoms, ions and molecules in condensed matter, periodic, quasiperiodic or amorphous, ideal or real, and, on the other, the theoretical and experimental aspects of the various methods to determine these properties and arrangements.