Novel approach in k₀-NAA for highly concentrated REE Samples

Area of Science:

• Nuclear Chemistry
• Analytical Chemistry
• Geochemistry

Background:

• Accurate quantification of rare earth elements (REEs) is crucial in mineral analysis.
• Traditional methods often face challenges with complex matrices and long analysis times.
• Neutron Activation Analysis (NAA) offers a sensitive technique, but requires optimization for specific applications.

Purpose of the Study:

• To develop and validate a new k0-NAA approach for accurate REE quantification.
• To reduce analysis time for REEs in high-content mineral matrices.
• To improve the reliability of REE measurements by addressing interferences and self-attenuation effects.

Main Methods:

• Experimental evaluation and improvement of REE k0 and Q0 values, spectral and nuclear interferences using standard solutions.
• Investigation of iterative gamma-ray self-attenuation and neutron self-shielding correction methods.
• Preparation of powder standards from rare earth oxides diluted with silica oxide.

Main Results:

• The new k0-NAA method demonstrated accurate REE quantification in a certified reference material (REE-2).
• Determined REE concentrations showed uncertainties below 7% (95% confidence level).
• Results exhibited good consistency with certified values for a wide range of REE concentrations.

Conclusions:

• The developed k0-NAA method provides accurate and efficient quantification of REEs in challenging mineral matrices.
• The iterative self-attenuation and self-shielding corrections enhance measurement precision.
• This approach offers a valuable tool for geological and materials science applications requiring rapid REE analysis.