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本工作研究了对有铀存在的溶液不经过化学分离采用γ谱直接测定237Np的方法。扣除237Np子体233Pa在Np86keV附近的γ射线峰的影响,可以定量测定237Np的量。溶液中大量铀的存在对86keV附近的γ射线有较强的吸收,86keV附近峰面积的对数与铀浓度呈线性关系。用最小二乘法拟合线性关系,对铀的影响加以校正,即可用γ谱测定铀溶液中237Np的含量。
This work has investigated the direct determination of 237Np by gamma spectrometry without chemical separation of the solution containing uranium. The deduction of the 233Np daughter 233Pa near the gamma ray peak near Np86keV can quantify 237Np. The presence of a large amount of uranium in the solution strongly absorbs γ rays near 86 keV, and the logarithm of the peak area near 86 keV has a linear relationship with uranium concentration. The least square method was used to fit the linear relationship and the influence of uranium was corrected. The content of 237Np in uranium solution could be determined by γ-ray spectrometry.