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<p>Neutron activation analysis (NAA) is a commonly used, non-destructive method to determine the elemental composition of a sample. When examining elements using NAA, materials with higher thermal absorption cross-sections can reduce the overall neutron flux in the sample by absorbing incident neutrons, preventing the sample from achieving a uniform activation. This effect is labeled “neutron self-shielding” and quantifying this effect is paramount to increasing the precision of NAA. The objective of this research was to use experimental methods to determine and quantify both the thermal and epithermal neutron self-shielding effects present in three common rare-earth elements (REEs): europium, samarium, and gadolinium. Effects were negligible below 500&#xa0;μg/g and that above this concentration level, self-shielding effects should be accounted for and corrected to ensure an accurate analysis using NAA.</p>

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Neutron absorption self-shielding effects of europium, gadolinium, and samarium during neutron activation analysis

  • 期刊论文

  • 发表日期：

    2025年10月31日

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  • E. T. Ross,
  • S. Landsberger

摘要

Neutron activation analysis (NAA) is a commonly used, non-destructive method to determine the elemental composition of a sample. When examining elements using NAA, materials with higher thermal absorption cross-sections can reduce the overall neutron flux in the sample by absorbing incident neutrons, preventing the sample from achieving a uniform activation. This effect is labeled “neutron self-shielding” and quantifying this effect is paramount to increasing the precision of NAA. The objective of this research was to use experimental methods to determine and quantify both the thermal and epithermal neutron self-shielding effects present in three common rare-earth elements (REEs): europium, samarium, and gadolinium. Effects were negligible below 500 μg/g and that above this concentration level, self-shielding effects should be accounted for and corrected to ensure an accurate analysis using NAA.