新型AGRSS航空伽玛能谱测量系统设计及其性能测试

Design and application test of new airborne gamma ray spectrometry system( AGRSS)

新型AGRSS航空伽玛能谱测量系统(简称AGRSS)采用自主开发的数字化多道分析器和数据通讯技术,实现了对航空伽玛能谱测量过程中航放数据的采集与控制,并且系统的设计易于维护和升级.文中详细介绍了AGRSS系统的组成、主要性能指标,校准与测试等方面的内容.AGRSS系统主要包括3箱Na I(Tl)晶体,航空伽玛能谱多道分析器和通讯接口、航空物探综合测量收录系统、电源分配器和辅助设备等.对AGRSS进行长时间测量和试验区测试飞行,测试了其性能.测试结果表明,该系统的技术指标达到或优于航空伽玛能谱测量规范要求,其性能稳定、具有较好的一致性,采集的数据信息可信.成功研发的AGRSS航空伽玛能谱测量系统可以在地质填图、区域地质研究和寻找放射性矿产方面发挥其特有的作用.

Using digital multi-channel analyzer and data communication technology developed by Airborne Survey and Remote Sensing Center of Nuclear Industry, radioactive data of airborne survey can be recorded and controlled with the new airborne gamma ray spectrometry system（ AGRSS）. Maintenance and upgrade of the system are easier. This paper describes the component,main performance, calibration and test of AGRSS.AGRSS system mainly includes 3 boxes of Na I（ Tl） crystal,aerial gamma spectrum multichannel analyzer and communication interface,recording system and auxiliary equipment. Through long time measurement and test flight,its performance was tested. The window data of spectrum changed between- 0. 94% - 0. 94%,the change of peak positions of208Tl（ 2. 614 Me V） is less than 0. 6channel; Down and up crystal resolution for137Cs（ 0. 662 Me V）were 9. 66% and 9. 63% respectively; Stripping coefficient for each window（ α、β、γ） were 0. 3067,0. 3827,0. 7477 respectively;Equivalent height gamma attenuation coefficient of TC,K,U,Th window were 0. 0068（ m- 1）,0. 0090（ m- 1）,0. 0083（ m- 1）,0. 0063（ m- 1） respectively; Relative deviation of twice total count of test flight is 13. 11%,potassium content is 9. 04%,uranium content is 1. 55%,and thorium content is 6. 50%. Test results show that the technical indexes can meet or are better than the airborne gamma ray spectrometry specifications. The system has a stable performance and a good consistency, data collection is credible. AGRSS can exert its role in the field of geological mapping, regional geological research and radioactive minerals exploration.