Application of Digital Spectroscopic Technique to Airborne Gamma-Ray Investigation

• 责任者：Zeng Guoqiang (College of Applied Nuclear Technology and Automation Engineering ; Chengdu University of Technology ; Chengdu 610051 ; China) ; Ge Liangquan
• 刊名：Geophysical and Geochemical Exploration
• 出版年：2010
• 卷期：34(2)
• 关键词：航空放射性测量 ; aeroradiometric surveys ; 伽玛能谱测量 ; gamma-spectrometry
• 页码：p.209-213
• 图表：7 illus., 6 refs.
• 分类号：1500
• issnNo：ISSN1000-8918
• isbnNo：CN11-1906/P

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.