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Lopes¹, Costa, de Jesus EF

¹Laboratorio de Instrumentacao Nuclear, COPPE-UFRJ, Rio de Janeiro, Brazil. ricardo@lin.ufrj.br

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Summary

This study developed quasi-monochromatic X-ray beams using filters of various elements and thicknesses. This method enhances differential tomography for elemental identification, improving imaging techniques.

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Area of Science:

Medical Physics
Materials Science
Radiological Imaging

Background:

X-ray beam quasi-monochromatization is crucial for advanced imaging techniques.
Developing effective filters is key to improving X-ray beam quality.
Differential tomography requires precisely controlled X-ray energy spectra.

Purpose of the Study:

To investigate the production of quasi-monochromatic X-ray beams using filters made of Mo, Sb, Cs, Ce, and Gd in a boric acid matrix.
To analyze the impact of filter thickness (50-300 microm) on X-ray beam resolution (FWHM) and intensity reduction.
To evaluate the application of these filtered beams in differential tomography for elemental identification.

Main Methods:

Fabrication of filters using a boric acid matrix with elements Mo, Sb, Cs, Ce, and Gd.
Systematic variation of filter thickness from 50 to 300 microm.
Operation of a high voltage X-ray tube from 30 to 70 kVp.
Measurement of beam resolution (Full Width at Half Maximum - FWHM) and beam intensity reduction.
Comparison of conventional and differential tomography images.

Main Results:

Filter thickness significantly affects X-ray beam resolution and intensity.
Optimal filter thicknesses were determined for different elements and X-ray tube voltages.
Differential tomography using these filtered beams successfully identified elements like Zr, Nd, Ba, and Sm.
The method demonstrated potential for enhancing elemental contrast in tomographic imaging.

Conclusions:

The developed filter method effectively produces quasi-monochromatic X-ray beams.
This technique improves differential tomography for elemental analysis in medical and materials imaging.
The study provides a foundation for optimizing X-ray imaging systems for specific elemental detection.