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| THE APPLICATION OF DIGITAL SPECTROSCOPIC TECHNIQUETO AIRBORNE GAMMARAY INVESTIGATION |
| ZENG Guo-qiang 1，GE Liang-quan 1，XIONG Sheng-qing 2, NI Wei-chong 3, LAI Wan-chang 1 |
| 1. College of Applied Nuclear Technology and Automation Engineering，Chengdu University of Technology, Chengdu 610051, China; 2. China Aero Geophysical Survey and Remote Sensing Center for Land and Resources, Beijing 100083, China; 3. Airborne Survey and Remote Sensing Center of Nuclear Industry , Shijiazhuang 050002, China |
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Abstract Analog spectroscopy based on peak sampling and holding circuit can't realize the airborne spectral measurement that uses several large size NaI(Tl) crystals This system makes use of Y/U double channel digital controlled gain amplifier to adjust the spectral drift. The designed digital spectroscopy uses high speed ADC and CPLD to complete baseline restore and peak height acquisition, thus improving the energy resolution. With this method, the maximum pulse through output rate is 100 k/s, the spectral drift is ±1 channel, and the start energy is less than 20 keV. This system has low power dissipation, small volume and high reliability. It can be used to perform airborne spectra measurement.
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Received: 10 August 2009
Published: 10 April 2010
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