数字对数机载Gamma Ray光谱仪
Digital Logarithmic Airborne Gamma Ray Spectrometer
摘要：
本文设计了一种新型的数字对数航空伽玛能谱仪。由于低能量脉冲信号比高能量脉冲信号具有更大的增益，谱仪采用高速高精度对数放大器（LOG114）对脉冲信号进行数字放大，提高了ADC动态范围的利用率。经过能量标定后，该谱仪在低能谱段中可以清晰地分辨出239、352、583和609keV处的四个重峰。137Cs的峰值能量分辨率由原来的7.8%提高到6.75%。此外，保持了K、U和Th这三个峰的能量分辨率，并且通过钾峰谱稳定化提高了能谱的整体稳定性。因此，可以有效地测量从20 keV到10 MeV的能量。
英文摘要：
A new digital logarithmic airborne gamma ray spectrometer is designed in this study. The spectrometer adopts a high-speed and high-accuracy logarithmic amplifier (LOG114) to amplify the pulse signal logarithmically and to improve the utilization of the ADC dynamic range, because the low-energy pulse signal has a larger gain than the high-energy pulse signal. The spectrometer can clearly distinguish the photopeaks at 239, 352, 583, and 609keV in the low-energy spectral sections after the energy calibration. The photopeak energy resolution of 137Cs improves to 6.75% from the original 7.8%. Furthermore, the energy resolution of three photopeaks, namely, K, U, and Th, is maintained, and the overall stability of the energy spectrum is increased through potassium peak spectrum stabilization. Thus, effectively measuring energy from 20keV to 10MeV is possible.
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