【摘要】 研究了测量U的过程中,后处理中常见基体元素Na、Al、Ru、Cs、Pd、Nd、Fe、Ce、Sr、Y、Mo、Zr等对U测量的影响。结果表明,基体元素Na、Fe、Al、Ru、Cs、Pd、Nd、Ce质量浓度在1 000 mg/L以下,对U的测量无显著影响。对U测量影响较大的元素为Sr、Y、Mo、Zr,当基体元素Sr、Y、Zr、Mo质量浓度在1 000 mg/L以下时,采用银靶散射线可以在一定程度上校正基体对U的影响;但质量浓度大于1000 mg/L时,校正效果不理想。U的Lα线强度对数和基体元素的质量浓度呈现很好的线性关系。通过数学校正法可以有效校正Sr、Y、Zr、Mo对U的影响。更多还原

【Abstract】 The influence of matrix elements that usually exist in spent nuclear fuel reprocessing,such as Na,Al,Ru,Cs,Pd,Nd,Fe,Ce,Sr,Y,Mo,and Zr,on the determination of uranium by highly oriented pyrolytic graphite(HOPG) pre-diffraction EDXRF is studied.The results show that the influence of matrix elements Na,Fe,Al,Ru,Cs,Pd,Nd,and Ce is negligibly small when their mass concentrations are lower than 1 000 mg/L.The influence of matrix elements Sr,Y,Mo and Zr is somewhat greater,and can be corrected to some degree by correction with scattered line of the silver target if their mass concentrations are lower than 1 000 mg/L.For higher mass concentration of these elements,their influence can be corrected by extrapolation of their mass fraction to zero by using the linear relationship between the logarithm of the uranium line intensity and the mass fraction of these elements.更多还原