实验室高纯锗γ谱仪的“稳谱法”研究

Study on“spectrum stabilization method”of laboratory high-purity germanium γ spectrometers

“峰漂”是影响γ谱仪测量准确度的重要因素。文中详细介绍了“天然放射性核素特征峰稳谱法”,采用天然放射性核素K-40的特征峰识别“峰漂”,并使用该峰对谱仪进行矫正。该方法具有操作简单、识峰快捷、实时准确矫正等优点,适合于实验室工艺系统样品γ核素测量。

[Background]The"peak drift"is an important factor affecting the measurement accuracy of the γ spectrometer.[Purpose]This study aims to quickly identify and correct the"peak drift"of the high-purity germanium(HPGe)γspectrometer in laboratory.[Methods]A novel"the natural radionuclide characteristic peak spectrum stabilization method"was proposed in detail.Instead of characteristic energy peak of standard radioactive source,this method made use of the characteristic peak of natural radionuclide K-40 to identify"peak drift"and correct the"peak drift"of HPGe γ spectrometer.The effectiveness of this method on the ORTEC HPGe gamma spectrometer was verified by using liquid multi nuclide standard source and standard point source 60Co.[Results&Conclusion]The results show that this"natural radionuclide characteristic peak spectrum stabilization method"has advantages of simple operation,fast peak recognition,and real-time accurate correction,which is suitable for the measurement of the γ nuclides in laboratory process system samples.