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Title: Optimizing detector geometry for trace element mapping by X-ray fluorescence

Journal Article · · Ultramicroscopy
 [1];  [2];  [3];  [4];  [2]
  1. Northwestern Univ., Evanston, IL (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
  3. Argonne National Lab. (ANL), Argonne, IL (United States); Northwestern Univ., Evanston, IL (United States)
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

We report that trace metals play critical roles in a variety of systems, ranging from cells to photovoltaics. X-Ray Fluorescence (XRF) microscopy using X-ray excitation provides one of the highest sensitivities available for imaging the distribution of trace metals at sub-100 nm resolution. With the growing availability and increasing performance of synchrotron light source based instruments and X-ray nanofocusing optics, and with improvements in energy-dispersive XRF detectors, what are the factors that limit trace element detectability? To address this question, we describe an analytical model for the total signal incident on XRF detectors with various geometries, including the spectral response of energy dispersive detectors. This model agrees well with experimentally recorded X-ray fluorescence spectra, and involves much shorter calculation times than with Monte Carlo simulations. With such a model, one can estimate the signal when a trace element is illuminated with an X-ray beam, and when just the surrounding non-fluorescent material is illuminated. From this signal difference, a contrast parameter can be calculated and this can in turn be used to calculate the signal-to-noise ratio (S/N) for detecting a certain elemental concentration. We apply this model to the detection of trace amounts of zinc in biological materials, and to the detection of small quantities of arsenic in semiconductors. In conclusion, we conclude that increased detector collection solid angle is (nearly) always advantageous even when considering the scattered signal. However, given the choice between a smaller detector at 90° to the beam versus a larger detector at 180° (in a backscatter-like geometry), the 90° detector is better for trace element detection in thick samples, while the larger detector in 180° geometry is better suited to trace element detection in thin samples.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357; R01GM104530
OSTI ID:
1257639
Alternate ID(s):
OSTI ID: 1247819
Journal Information:
Ultramicroscopy, Vol. 152, Issue C; ISSN 0304-3991
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 27 works
Citation information provided by
Web of Science

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Cited By (11)

Optimization-based simultaneous alignment and reconstruction in multi-element tomography journal January 2019
Eliminating the non-Gaussian spectral response of X-ray absorbers for transition-edge sensors journal November 2017
A high-throughput energy-dispersive tender X-ray spectrometer for shot-to-shot sulfur measurements journal April 2019
2016 Atomic Spectrometry Update – a review of advances in X-ray fluorescence spectrometry and its applications journal January 2016
Incremental distribution of strontium and zinc in great ape and fossil hominin cementum using synchrotron X-ray fluorescence mapping journal January 2018
Synchrotron hard X-ray chemical imaging of trace element speciation in heterogeneous samples: development of criteria for uncertainty analysis journal January 2020
Effect of mechanical noise upon X-ray fluorescence analysis journal May 2019
Joint reconstruction of x-ray fluorescence and transmission tomography journal January 2017
Incremental distribution of strontium and zinc in great ape and fossil hominin cementum using synchrotron X-ray fluorescence mapping text January 2018
Fast X-ray microfluorescence imaging with submicrometer-resolution integrating a Maia detector at beamline P06 at PETRA III text January 2016
Synchrotron hard X-ray chemical imaging of trace element speciation in heterogeneous samples: Development of criteria for uncertainty analysis text January 2020

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