A method for determining the neutron energy spectrum in the steady-state neutron field of a reactor independent of the initial spectrum

Abstract

The invention provides a neutron energy spectrum determination method in a reactor steady-state neutron field that does not depend on the initial spectrum, proposes an entropy function that characterizes the distribution of the neutron energy spectrum, and applies the corresponding maximum entropy principle to establish a global system for determining the neutron energy spectrum Optimization methods, including determining the neutron group structure, measuring and recording the single-nuclear activity of various nuclides, calculating and recording the microscopic cross-section of each group of various nuclides, establishing discrete activation equations, and establishing the probability distribution of neutron energy spectrum Table and other steps to solve the problems of existing methods relying on the initial spectrum and low computational efficiency.

Description

technical field [0001] The invention relates to a method for determining the neutron energy spectrum of the reactor steady-state field, in particular to a method for determining the neutron energy spectrum of the reactor steady-state field based on multi-activation foil detection data. Background technique [0002] Obtaining accurate neutron spectrum information is crucial in research in the fields of nuclear physics experiments and dose assessment. A certain neutron energy spectrum determination method is based on a specific detection technology and spectral solution method. At present, the despectral method based on multi-activated foil detection technology data belongs to the optimized despectral method, which is mainly established based on the least square principle, minimum divergence principle, Monte Carlo algorithm or neural network and other theoretical principles. There are global optimization methods and There are two kinds of local optimization methods, and the t...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a neutron energy spectrum determination method, which is based on multi-activation foil detection data and is used to determine the neutron energy spectrum of a steady-state neutron field through high-efficiency calculations under the premise of no initial spectrum, so as to solve the existing problems. The method depends on the initial spectrum and the problem of low computational efficiency

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