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通过分析铁电核辐射探测工作原理及电路响应过程,建立电学信号与材料性能及辐射场波形的理论关系,利用程序GEANT4模拟了CFBR-Ⅱ堆泄漏中子和伽马在具有代表性的锆钛酸铅镧(PLZT)铅基陶瓷、钽酸锂单晶以及聚偏氟乙烯(PVDF)典型铁电材料中的能量沉积状况,获得了3种典型铁电材料用于核辐射探测的性能。3种探测器的探测灵敏度约为10~(-25)~10~(-27)C·m~(-2),其中PVDF探测器灵敏度最低,但其信号98%是由脉冲中子场贡献,因此PVDF探测器可用于高强度快中子脉冲波形测量。
By analyzing the working principle and circuit response process of the ferroelectric nuclear radiation detection, the theoretical relationship between the electrical signal and the material properties and the wave field of the radiation field was established. The program GEANT4 was used to simulate the leakage of neutron and gamma in the CFBR- Three kinds of typical ferroelectric materials have been obtained for the detection of nuclear radiation by energy deposition in typical lead-acid lanthanum (PLZT) lead-based ceramics, lithium tantalate single crystals and polyvinylidene fluoride (PVDF) ferroelectric materials. The detection sensitivity of the three detectors is about 10 ~ (-25) ~ 10 ~ (-27) C · m ~ (-2). The sensitivity of the PVDF detector is the lowest, but 98% of the signal is contributed by the pulsed neutron field , PVDF detectors can be used for high-intensity fast neutron pulse waveform measurement.