Method for eliminating delayed effect of self-power neutron detector

Abstract

The invention relates to a method for eliminating delayed effect of a self-power neutron detector, which is characterized in that the expressions of a dynamical differential equation of each intermediate nuclide quantity Ni(t) related to neutron-flux density Phi(t) and detection current (I)(t) and each intermediate nuclide quantity and neutron-flux density Phi(t) are written, a relation formula of Ni(nTs) and Ni((n-1)Ts) and I((n-1)Ts) can be obtained through change of equation and expression, and relation of Phi(nTs) and Ni(nTs) and I(nTs) can be obtained; an initial value of Ni(0) and I(0) is given; sampling is carried out by measuring the current of the neutron detector to obtain the measured value Im(nTs) of the current sampling; Is(nTs) is obtained through treatment of Im(nTs), and each intermediate nuclide quantity in unit volume of the detector in a next cycle and the instantaneous value of the neutron-flux density for time delayed effect elimination at current time section can be obtained and then are output. The method for eliminating delayed effect of the self-power neutron detector overcome the current signal delay problem brought by the half life restriction; noise is introduced for filtering so as to adapt to complex detection environment of a reactor core; and no Laplace transformation and Z transformation is required.

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 there are also some shortcomings: 1) The relevant literature often only includes the first and third parts, ignoring the second part, Although this part is not the main component of Rh, its effect cannot be ign

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