Nd同位素溯源铀矿石浓缩物产地研究

铀矿石浓缩物(UOC)是核法证学中溯源研究的核材料之一，通过测量其中Nd同位素丰度比能提供地理指示信息。本文基于TRU树脂对铀和稀土元素的吸附特性，通过条件实验获得了最佳淋洗酸度和体积，分离稀土元素和大量铀基体；利用LN树脂分离镧系元素的特性，分离具有同量异位素干扰的Sm，使用TRU和LN树脂联用方式有效分离了Nd，建立了一种能分离UOC中U、Sm和Nd的方法。应用该方法对UOC样品进行多次测量，洗脱液中U含量低于5 ng/g，有效实现了UOC中大量U与微量Nd的分离。采用多接收电感耦合等离子质谱对Nd同位素进行测量，测量精度达0.002%，满足Nd同位素测量需求。该方法已用于实际UOC样品中的Nd分离，并进行了初步溯源研究。

Traceability Research of Neodymium Isotope in Uranium Ore Concentrate

Uranium ore concentrate (UOC) is one of the nuclear materials for traceability research in nuclear forensics. It can provide geographic indication information by measuring the neodymium isotope abundance ratio. Based on the adsorption characteristics of TRU resin for uranium and rare earth elements, the optimal leaching acidity and volume were obtained through condition experiments, and the rare earth elements and a large amount of uranium matrix were separated. Samarium with isobaric interference was separated from lanthanide by LN resin. The combination of TRU and LN resin was used to effectively separate neodymium, and a method was established to separate uranium, samarium, and neodymium from the UOC. The uranium content in the eluent is less than 5 ng/g. The neodymium isotope was measured by multi acceptance inductively coupled plasma mass spectrometry. The accuracy of the result is 0.002% and meets the requirements of neodymium isotope measurement. This method was used for the separation of neodymium in actual UOC samples and traced the source preliminarily.