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Energy-Dispersive X-Ray Spectrum Simulation with NIST DTSA-II: Comparing Simulated and Measured Electron-Excited
Dale E Newbury1, Nicholas W M Ritchie1
1National Institute of Standards and Technology, Gaithersburg, MD 20899, USA.
NIST DTSA-II software accurately simulates energy-dispersive spectrometry (EDS) spectra for quantitative elemental analysis. This tool aids in predicting X-ray intensities, optimizing measurements, and developing strategies for trace element detection.
Area of Science:
- Materials Science
- Analytical Chemistry
- Physics
Background:
- Quantitative elemental analysis using electron-excited X-ray microanalysis with energy-dispersive spectrometry (EDS) relies on software for accurate intensity extraction and physical interaction corrections.
- The development of robust software is crucial for reliable EDS quantification and measurement optimization.
Purpose of the Study:
- To introduce NIST DTSA-II as a comprehensive, open-access software platform for EDS quantification, measurement optimization, and spectrum simulation.
- To validate the accuracy of DTSA-II's spectrum simulation capabilities by comparing predicted and measured X-ray intensities.
Main Methods:
- Utilizing NIST DTSA-II software for energy-dispersive spectrometry (EDS) spectrum simulation.
- Predicting EDS spectra for various target compositions based on specified electron dose, spectrometer solid angle, and window parameters.
- Comparing absolute intensities of simulated spectra with experimentally measured spectra for characteristic X-ray peaks and continuum.
Main Results:
- Spectrum simulation with DTSA-II shows good agreement with measured spectra, with K-shell and L-shell peaks within ±25% for 1–11 keV.
- M-shell intensity predictions exceeded measured values by a factor of 1.4–2.2 in the 1–3 keV range.
- The X-ray continuum (bremsstrahlung) generally agreed within ±10% across the 1–10 keV range.
Conclusions:
- NIST DTSA-II provides accurate spectrum simulations, crucial for quantitative elemental analysis via EDS.
- The software is a valuable tool for measurement optimization and developing analytical strategies, particularly for challenging trace detection levels.
- The validated simulation capabilities enhance the reliability and applicability of EDS in materials analysis.


