Digital logarithmic airborne gamma ray spectrometer

ZENG Guo-Qiang; ZHANG Qing-Xian; LI Chen; TAN Cheng-Jun; GE Liang-Quan; GU Yi; CHENG Feng

doi:10.1088/1674-1137/38/7/076001

Chinese Physics C> 2014, Vol. 38> Issue(7) : 076001 DOI: 10.1088/1674-1137/38/7/076001

Digital logarithmic airborne gamma ray spectrometer

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Abstract：
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. After energy calibration, the spectrometer can clearly distinguish photopeaks at 239, 352, 583 and 609 keV in the low-energy spectral sections. 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, it is possible to effectively measure energy from 20 keV to 10 MeV.

References

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ZENG Guo-Qiang, ZHANG Qing-Xian, LI Chen, TAN Cheng-Jun, GE Liang-Quan, GU Yi and CHENG Feng. Digital logarithmic airborne gamma ray spectrometer[J]. Chinese Physics C, 2014, 38(7): 076001. doi: 10.1088/1674-1137/38/7/076001

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Received: 2013-07-30
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Digital logarithmic airborne gamma ray spectrometer

Corresponding author: ZENG Guo-Qiang,

Received Date: 2013-07-30
Accepted Date: 1900-01-01
Available Online: 2014-07-05

Abstract: 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. After energy calibration, the spectrometer can clearly distinguish photopeaks at 239, 352, 583 and 609 keV in the low-energy spectral sections. 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, it is possible to effectively measure energy from 20 keV to 10 MeV.