一种252Cf裂变中子源的中子、γ射线飞行时间谱测量新方法
TOF spectrum measurement of 252Cf source fission neutron and gamma ray
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摘要: 针对252Cf快中子、γ射线的飞行时间谱测量要求，提出并建立一种基于高速数据采集卡的新型测量系统。采用1 GHz高速A/D转换单元和现场可编程门阵列高速处理单元，进行脉冲时间序列的在线检测，时间精度为1 ns。使用相关函数法，通过PC机的数据处理、互相关函数计算和数值统计等实现中子、γ射线飞行时间谱的测量。实验结果表明，该系统可以获得252Cf自发裂变中子源的中子、γ射线飞行时间谱，与经典的飞行时间谱测量方法相比较，其图谱表达及数值结果有着很高的吻合度。Abstract: For the measurement of flight time spectrum for 252Cf fast neutron and gamma ray, a new measuring system based on high-speed data acquisition card is put forward and constructed. The data acquisition card uses high speed A/D converting unit(1 GHz) and high speed processing unit. It can accomplish on-line time detecting of pulse sequence at 1 ns precision. The measurement of flight time spectrum is done by correlation function. Through data processing arrangement and cross correlation function calculation designed on PC, flight time spectra of 252Cf Source fission neutron and gamma ray can be obtained. The results agree with those from the classical measuring system in a degree of 99.9%, which consists of time-amplitude converter and multi-channel analyzer.
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