基于坎贝尔定理的中子监测技术的研究

摘要

In unit volume unit time , the number of neutron fission occurring in nuclear reactor is proportional to the neutron flux rate .Traditional nuclear reactor use BF 3 , compensation ionization chamber and non -compen-sated ionization chamber detector to achieve neutron monitoring of Ex -core Nuclear Instrumentation System . However , with "third generation"nuclear technology promotion , the advantage of fission chamber neutron de-tection technology in the reactor accident monitoring has been recognized by the industry .Meanwhile , the fis-sion chamber detector's high reliability and high SNR performance can meet the "three generations"Ex-core Nuclear Instrumentation System .The article is based on Campbell's theorem for neutron monitoring techniques are discussed .%随着＂三代＂核电技术的推广，裂变室中子探测技术在反应堆事故后监测的优势已经为业界认可，同时，裂变室探测器的高可靠性和高信噪比性能满足＂三代＂堆外核测量系统的技术要求。本文主要探讨了裂变室中子探测器在高中子注量率的情况下，脉冲重叠（105～1010 cps）时的处理理论（即：坎贝尔定理），然后针对坎贝尔定理中要求提出了一种RMS电压测试电路，并使用ADI公司的AD637[1]集成电路实现了裂变室中子探测器在高中子注量率下的中子注量率测量方法。该方法有着工艺简单、响应时间快、线性度好、精度高等特点。