一种252Cf裂变中子源的中子、γ射线飞行时间谱测量新方法

 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。

TOF spectrum measurement of 252Cf source fission neutron and gamma ray

For the measurement of flight time spectrum for ~(252)Cf 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 ~(252)Cf Source fission neutron and gamma ray can be obtained. The results a-gree with those from the classical measuring system in a degree of 99. 9%, which consists of time-amplitude converter and multichannel analyzer.