【作者】 葛良全； 曾国强； 赖万昌； 范正国； 倪卫冲； 熊盛青；

【Author】 GE Liang-quan~1,LAI Wan-chang~1,ZENG Guo-qiang~1,FAN Zhen-guo~2, NI Wei-zhong~3,XIONG sheng-qing~2 (1.Chengdu University of Technology,Chengdu of Sichuan Prov.610059,China; 2.China Aerogeophysical Survey and Remote Sensing Center for Land and Resources,Beijing 100083,China; 3.Airborne Survey and Remote Sensing Center of Nuclear Industry,Shijiazhuang of Hebei Prov.050002,China)

【机构】 成都理工大学地学核技术省重点实验室； 中国国土资源航空物探遥感中心； 核工业航测遥感中心；

【摘要】 航空伽玛能谱测量技术已经成为寻找放射性铀、钍矿床和非放射性的多金属矿、贵金属矿、钾盐、石油等,以及环境放射性污染调查与评价、核设施监测、核事故应急事件监测等主要的支撑技术。论述了具有自主知识产权的航空数字化伽玛能谱测量系统的最新研制成果。该测量系统以NaI（Tl）晶体（10 mm×10 mm×40 mm）和光电倍增管构成的闪烁计数器为伽玛射线探测器,采用4条下测晶体和1条上测晶体组合成航空伽玛能谱测量系统的探头,设计了温度传感器、电流反馈型前置放大器和低纹波高压供电电路,实现了伽玛光子与核信号的转换;采用Y/U双通道数控增益放大器、双回路自动稳谱电路和算法实现了谱漂的精细调节和自动稳谱,通过高速ADC与CPLD实现模拟核信号的数字化。研制的航空数字化伽玛能谱测量系统可接入NaI（Tl）闪烁计数器伽玛探测器数20条,可探测能量范围为0.02～10.0 MeV,采样周期为0.5^-1s,最大计数通过率大于100 k/s,1024道谱漂±1道。更多还原

【Abstract】 Airborne Gamma-ray Spectrometry（AGS） is a main supporting technique for looking for uranium deposits and other non-radioactive mineral deposit,as well as for investigating environmental radiation pollution and monitoring nuclear equipment.This paper describes the newest achievements about the AGS instrument developed by Chengdu university of Technology.Those are:1) the probe of AGS is composed of 5 NaI（Tl）+PMT scintillation counters with 10×10×40mm size, and a special temperature sensor,preamplifier with circuit negative feedback and high voltage with lower electronic noise have been designed.2)A YAJ double channel digital controlled gain amplifier for adjusting the spectrum drift finely and high speed ADC and CPLD are designed to perform digitalized spectroscopy and to improve the energy resolution and pulse through output rate（more than 100k/s）.3) Two self-stabilization spectrum loops have been designed for spectrum stability: The first loop is roughly adjusted by temperature and the second loop is finely by Kalman filter.4) The significant characters of new AGS system are:the detective gamma energy range is 0.02-10.0 MeV,the spectrum drift is±1 channel,the collecting period is 0.5^-1 s,and 20 Nal（Tl） +PMT scintillation counters can be operated at the same time.更多还原