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

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.