Method for determining composition and parameters of self-powered neutron detector delay elimination circuit

Abstract

A method for determining the composition and parameters of a self-powered neutron detector delay elimination circuit comprises the following steps: writing a relationship among the current I(t), the number of each nuclide and the neutron flux density phi(t) according to the physical process of a detector emitter electrode material in a neutron field; finding a response current to a pulse neutron flux, that is an impulse response, and then finding a current response function under a step neutron flux; performing Laplace transform, finding the inverse function of the current response function toobtain a delay correction transfer function G(s) = phi(s)/I(s); and designing the circuit according to the transfer function G(s). The circuit can correct the delay current signal of a self-powered neutron detector, and can overcome the signal delay caused by the half-life of the middle nuclide; in the method, impulse response is firstly found, and then the Laplace transform and inverse functionfinding of the step response obtained by a convolution relationship are carried out, so complicated operation of direct Laplace transform of differential equations is avoided; and the transfer function is used to directly determine the parameters of the delay correction circuit, so the method is simple and convenient.

Description

technical field [0001] The invention belongs to the technical field of neutron detection, in particular to a method for eliminating the delay effect of a self-powered neutron detector. Background technique [0002] Nuclear energy is the most promising future energy source for mankind. In a nuclear reactor, the neutron flux density is the physical quantity that can most intuitively reflect the power of the reactor and the status of the reactor. At the same time, people also control the reactor by controlling the neutron flux density in the reactor. Due to the particularity of nuclear reactors and the importance of safe operation of nuclear reactors, neutron detection plays a vital role in the detection of various particles and rays in the reactor. [0003] The internal detection environment of the reactor core is complex, and its requirements for neutron detectors are relatively high, such as high temperature resistance, radiation resistance, simple structure and miniaturiza...

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Problems solved by technology

[0007] At present, many scholars at home and abroad have done a lot of research on rhodium self-sufficient energy detectors, and have obtained a lot of results, but also have some shortcomings: 1) the relevant literature often only contains the first and third

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