大体积NaI(Tl)数字式车载γ能谱仪的研制

Developement of Large Volume NaI(Tl) Digital Carborne γ Spectrometer

车载γ能谱仪主要应用于区域放射性核素活度测量、放射源搜索及核污染检测,而数字化技术是提高车载γ能谱仪灵敏度与快速响应的有效方法。本文研制了可支持1~5个4L大体积NaI（Tl）的数字式车载γ能谱仪系统。该系统采用数字核脉冲处理技术独立获取多个NaI（Tl）晶体的能谱,并通过无线WiFi、快速以太网、RS232等3种方式发送谱线数据给军用计算机。本系统在计算机上实现了实时核素识别、数字成图、色差能谱显示、ROI监控、数据回放等功能。结果表明,本系统采用数字技术后提升了车载γ能谱仪的能量分辨率、低能射线识别度和能量线性度,且具备更加稳定精确的数字稳谱效果。该系统不仅可用于放射性资源勘查,也可用于快速核应急、核污染检测、放射源搜索等。

The carborneγspectrometer is mainly used in the areas of radionuclide activity measurement,searching for radioactive sources and nuclear pollution detection,and the digital pulse processing technology is an effective way to improve the sensitivity and rapid response of carborneγspectrometer.The system of digital carborneγspectrometer was developed to support 1-5 4Llarge volume NaI（Tl）crystals in this paper.The system used digital pulse processing nuclear technology to obtain multiple independent NaI（Tl）spectra,and transmittes spectrum data to the military computer via WiFi,fast Ethernet,RS232.This system achieves the functions of nuclide identification,digital mapping,color spectrum display,ROI monitoring and data playback.The results show that the system using digital technology can enhance the energy resolution of carborneγspectrometer,identification ability of low-energy ray and energy nonlinearity,and has a more stable and accurate digital spectrum stabilization effect.The system is stable and reliable,and can be used for radiation resource exploration,fast nuclear accident emergency,nuclear contamination monitoring,and radiation source search.