Experimental Measurement of Neutron Noise Time Interval Distribution and Theoretical Research on Calculation Method

Experimental research on the measurement of the reactor dynamic parameters is carried out by the time interval distribution method（Babala method）.This paper describes how to acquire the distribution of the lengths of intervals between neutron pulse counts using MSP430 Single-Chip Computer and how to transfer the data to the PC.The interval distribution of neutron signals on the sub-critical facility at Depart-ment of Engineering Physics in Tsinghua University is measured,and the results are analyzed,to study the calculation method for the eigen value α based on the measured data.Further more,Feynman method and Rossi-α method are used to calculate the value of α,which are compared with the Babala method.The results indicate that Babala method for dynamic parameter measurement could reduce the measurement time and im-prove the accuracy of measurement results.This paper also gives out the statistical distribution difference be-tween the source neutrons and reactor neutrons.