【摘要】 通常野外环境下使用γ谱仪的工作温度范围为-20~50℃。NaI谱仪易受温度变化影响,当成形窄脉冲时尤为显著。本文设计的一种数字稳谱新方法可对每个脉冲进行实时幅度校正,在不增加系统复杂度的同时利用137Cs参考源的两个特征峰进行实时稳谱。实验结果表明,在-20~50℃温度范围内,该方法可有效改善NaI谱仪的温度稳定性。更多还原

【Abstract】 Generally,the field application gamma spectroscopy shall be capable of operating in the temperature range from-20℃ to 50℃.NaI spectroscopy is sensitive to the temperature drift and such effect will be more evident at the narrow pulse width.We designed a new digital stabilizing method to correct the amplitude of each pulses in real time.The two characteristic peaks of 137Cs are used to stabilize the spectrum in real time without increasing the system complexity.The experimental result shows that this method could efficiently improve the thermal stability of NaI spectroscopy in the temperature range from-20℃ to 50℃.更多还原