Use of highly energetic (116 keV) synchrotron radiation for X-ray fluorescence analysis of trace rare-earth and heavy elements

Abstract

This study has revealed the advantages of the use of 116 keV X-rays as an excitation source of X-ray fluorescence (XRF) analyses. This technique is suitable for nondestructive multielemental analyses of heavy elements such as rare-earth elements. The lowest MDL value evaluated for the bulk analysis of a JG-1 standard reference sample (granite rock) was 0.1 ppm for W for a 500 s measurement. The spectrum of standard glass samples of SRM612 demonstrated clearly resolved K-line peaks of more than 30 elements, including all the existing rare-earth elements, at 50 ppm levels. The calibration curve for the determination of a rare-earth element shows a linear relation between the XRF intensity and concentrations from 10 to 0.03 ng. This powerful technique should be useful for nondestructive analyses of rare-earth and heavy elements in geological, geochemical and archaeological samples as well as industrial materials.

Synchrotron RadiationX‐Ray Fluorescence Spectrometry

“…(134) After the commissioning of the high-energy third-generation storage ring of SPring-8, monochromatic X-rays of more than 100 keV were applied to the analysis of the rare-earth elements, as shown in Figure 18, and a detection limit of less than 50 ppm was attained. (135) Recently, advanced total-reflection mirror optics for micro-focusing in the X-ray energy range 30-100 keV were developed, and a focusing spot of around 0.35 μm 2 was obtained with an X-ray energy of 80 keV. ( Other mirror systems that have enough working distance have also been developed and a beam size of 1.3 μm (V) × 1.5 μm (H) was obtained with an X-ray energy of 20-37.7 keV.…”

Capability of aTES microcalorimeter SEM‐EDS system for forensic analysis of automotive paint and gunshot residue

“…It seems that the use of LA-ICP-MS has already gained wide acceptance as a powerful technique for the discrimination of trace evidence found at crime scenes, such as automotive paint and glass fragment samples. On the other hand, high-energy SR-XRF analysis was first developed by one of the present authors [5,6] and introduced to the forensic analysis of trace material evidence concerning arsenic murders committed in Japan. [6,7] The results have produced solid evidence to the courts, and this was the first application of SR to actual forensic analysis.…”

Determination of the vibrational density of states and emission spectrum of lutetium monoxide

“…From Equation (14) it follows that the averaged emission spectrum, within the quasi-harmonic approximation, is approximately majorized by a quantity inversely proportional to the cube of e and also inversely proportional to the frequency range.…”