Patent Number: 
Section: claims

1. A neutron monitoring method comprising the steps of: counting negative pulse signals output from a neutron detector that outputs negative pulse signals upon detecting neutron flux;  counting positive pulse signals from the neutron detector; and  measuring the neutrons based on said negative pulse signals and said positive pulse signals so as to reduce influence by noise pulses. 2. A neutron monitoring system comprising: a neutron detector that outputs negative pulse signals upon detecting neutron flux;  a first pulse count rate measurement means provided with the pulse signals output from said neutron detector for counting the negative pulses per unit time;  a second pulse count rate measurement means provided with the output pulse signals from said neutron detector for counting positive pulses per unit time; and  a pulse count correction means for obtaining a corrected count rate excluding the fluctuation of the pulse count rate caused by the influence of the electric noises, by computing a pulse count of first pulse count rate measurement means and a pulse count of said second pulse count rate measurement means.