嵌入式异构模型下低分辨率γ能谱实时解析方法研究

针对γ能谱测量中（NaI(TI)或LaBr3(Ce)）探测器有限的能量分辨率致使谱参量提取复杂化，进而导致谱处理算法对系统响应产生时延的难题。本项目拟构建多节点输出的嵌入式异构系统实验模型，研究软硬件协同任务调度算法与各个节点间的通信机制，满足运算节点与主控节点之间实时谱数据传输。综合考虑实际应用环境中存在放射性的统计涨落，将重点采用反卷积联合寻峰与重峰分解、最小二乘拟合求取净峰面积、最优线性联想神经网络（OLAM）核素识别及活度计算等实时能谱解析方法；提取实时获取重叠峰的各个参数，校正死时间与随机加和效应而产生的计数丢失。解决实时能谱数据处理、谱峰参数控制、谱数据高速传输等软硬件于一体的便携式谱仪关键技术问题。研制适用于低分辨率γ能谱实时解析的嵌入式异构实用模型。为应用在江西丰富的矿产资源勘探及放射性环境监测等领域中新型智能化核仪器的理论与实践研究奠定坚实基础。

The extraction of spectral parameters is very difficult because of the limited enegry resolution for NaI(TI) and LaBr3(Ce) gamma-ray detectors, and it takes more time for system response to finish processing complicated algorithms. Then, An Embedded Heterogeneous System with multiple output nodes is proposed. By studying co-scheduling algorithms between hardware and software, communication mechanism among the nodes, high-speed data transmission between computing node and control node become available.For statistical fluctuation of radioactivity under complex environment,some methods are proposed to solve the problem. These methods include adopting some energy-spectra real-time decomposition algorithm such as combined peak search and overlapped peak decomposition based on deconvolution,peak net area calculating based on least square method,nuclide identifying and nuclide activity computing based on Optimal Linear Associative Memory neural network(OLAM), obtaining real-time various parameters of overlapping peaks and correcting counting loss which is produced from dead time and random increment effect.On this basis,key technical issues of portable spectrometer which has some key features such as real-time nuclear spectral data processing, control of spectral parameters and high-speed transmission of spectrum data will be solved. Finally a real-time parsing model for low-resolution γ spectrometry based on embedded heterogeneous system is construted. At last, in academic aspect, the new instrument will contribute to developing theory of intelligent nuclear instrument. In application aspect, the device will be widely used to mineral exploration and radioactive monitoring in Jiangxi province.