The present paper presents a new approach for k₀-NAA for accurate quantification with short turnaround analysis times for rare earth elements (REEs) in high content mineral matrices. REE k₀ and Q₀ values, spectral interferences and nuclear interferences were experimentally evaluated and improved with Alfa Aesar Specpure Plasma Standard 1000 mg kg^-1 mono-rare earth solutions. The new iterative gamma-ray self-attenuation and neutron self-shielding methods were investigated with powder standards prepared from 100 mg of 99.9% Alfa Aesar mono rare earth oxide diluted with silica oxide. The overall performance of the new k₀-NAA method for REEs was validated using a certified reference material (CRM) from Canadian Certified Reference Materials Project (REE-2) with REE content ranging from 7.2 mg kg^-1 for Yb to 9610 mg kg^-1 for Ce. The REE concentration was determined with uncertainty below 7% (at 95% confidence level) and proved good consistency with the CRM certified concentrations.

本文提出了一种用于k ₀ -NAA的新方法，该方法可对高含量矿物基体中的稀土元素（REE）进行较短的周转分析时间，从而进行准确的定量分析。使用Alfa Aesar等离子体标准1000 mg kg ^-1单稀有稀土溶液对REE k ₀和Q ₀值，光谱干扰和核干扰进行了实验评估和改进。使用由100毫克经氧化硅稀释的99.9％Alfa Aesar单稀土氧化物制成的粉末标准品，研究了新的迭代伽马射线自衰减和中子自屏蔽方法。新k ₀的整体性能使用加拿大认证参考材料项目（REE-2）的认证参考材料（CRM）验证了REEs的-NAA方法，其REE含量范围从Yb的7.2 mg kg ^-1到Ce的9610 mg kg ^-1。确定的REE浓度的不确定度低于7％（置信水平为95％），并证明与CRM认证浓度具有良好的一致性。