An Optimal Design Method for the Structure of a Self-Energy Neutron Detector

Abstract

An optimal design method of a self-powered neutron detector structure comprises the steps of 1, selecting shape and parameters of self-powered neutron detector geometry; 2, establishing a basic geometric characteristic layer in a program; 3, imparting a material to the basic geometric characteristic layer; 4, defining energy, position and incoming direction of primary incoming neutrons; 5, adding a required physical process; 6, simulating a process where the incoming neutrons physically react with the material, recording quantity of secondary electrons drifting from an emitter or an insulator to a collector and arrival time, and outputting based on class; 7, calculating a neutron sensitivity and transient current ratio of the self-powered neutron detector; 8, saving a data point, and judging whether returning to step 2 occurs; 9, acquiring a variation curve of detector performance with detector parameters; 10, determining the structure and size of the detector as required finally in order to improve the detector performance. The method of the invention can provide professional optimal design for neuron spectrums of any reactor.

Description

technical field [0001] The invention relates to the technical field of reactor neutron flux measurement, in particular to an optimal design method for a self-powered neutron detector structure. Background technique [0002] Because of its high energy density, nuclear energy occupies an irreplaceable position in the sustainable energy structure. But nuclear safety is a key issue that must be solved in the application of nuclear energy. In nuclear reactors, the neutron flux density is a key physical quantity to monitor and control the normal operation of the reactor. Due to the high temperature, high pressure and strong radiation environment of the reactor core, general detectors are not competent. The self-powered detector has become an important detector for monitoring the neutron flux of the reactor core due to its characteristics of no bias voltage, simple structure, small size, solidification of the whole body, and simple electronic equipment. Its typical structure is ...

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Problems solved by technology

[0007] The size of the emitter, insulator and collector is different, the proportion of the number of neutrons that can enter the emitter is different, the ratio of gamma photons generated by neutron capture into current is also different, and the particles released during the decay process are converted into current. The proportion of the neutron detector is also different, so the change of the size of the emitter, the insulator and the collector will change the neutron sensitivity and the proportion of the transient current of the self-powered neutron detector, thus affecting the whole self-powered neutron detector. performance

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