| abstract |
PROBLEM TO BE SOLVED: To provide a method for estimating a plutonium concentration in a uranium-plutonium solution system and a monitoring system based on simultaneous neutron counting. SOLUTION: For the point model simultaneous equation, correction of neutron multiplication absorption effect, correction of spectral difference between (α, n) source neutron and spontaneous fission source neutron, and correction of induced nuclear fission neutron and spontaneous fission source neutron. By correcting the difference in detection efficiency, the calculation result of the neutron simultaneous count of the improved point model simultaneous equation can accurately reflect the measurement result of the neutron simultaneous count of the neutron detection system outside the uranium-plutonium solution system. , The neutron-plutonium solution system can accurately estimate the plutonium concentration. [Selection diagram] Fig. 3 |