Initial-spectrum-independent method for determining neutron energy spectrum in reactor steady-state neutron field

A technology for determining methods and neutron fields, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as low calculation efficiency and dependence on initial spectra

Inactive Publication Date: 2015-04-29
NORTHWEST INST OF NUCLEAR TECH
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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 stead...

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  • Initial-spectrum-independent method for determining neutron energy spectrum in reactor steady-state neutron field
  • Initial-spectrum-independent method for determining neutron energy spectrum in reactor steady-state neutron field
  • Initial-spectrum-independent method for determining neutron energy spectrum in reactor steady-state neutron field

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Embodiment Construction

[0065] Basic idea of ​​the present invention is:

[0066] 1) The present invention determines the neutron energy spectrum based on multi-activation foil detection technology. The activation method is one of the main methods for detecting neutrons at present. The multi-activation foil detection technology based on the activation method has insensitivity to gamma rays, low interference to the original field, pulse measurability, and ease of operation. A series of advantages such as good economy make it widely used in the determination of neutron energy spectrum in reactors, accelerators and other devices. Therefore, the present invention chooses to determine the neutron energy spectrum of the steady-state neutron field based on the multi-foil activation detection technique.

[0067] 2) The present invention establishes a global optimized neutron spectrum analysis method based on the energy spectrum entropy function and the principle of maximum entropy. In the fields of thermod...

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Abstract

The invention provides an initial-spectrum-independent method for determining neutron energy spectrum in a reactor steady-state neutron field, and discloses a global optimization method for determining neutron energy spectrum by proposing an entropy function for representing neutron energy spectrum distribution and applying a corresponding maximal entropy principle. The initial-spectrum-independent method comprises the following steps of determining a neutron group structure, measuring and recording mononuclear activity of each nuclide, calculating and recording a microscopic cross section of each group of each nuclide, establishing a discrete activation equation set, establishing a probability distributing table of the neutron energy spectrum, and the like. According to the initial-spectrum-independent method disclosed by the invention, the problem that an existing method is dependent on initial spectrum and low in calculating efficiency is solved.

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-activation 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 ...

Claims

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Application Information

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IPC IPC(8): G06F19/00
Inventor 长孙永刚陈伟张文首于青玉苏春磊邬泽鹏
Owner NORTHWEST INST OF NUCLEAR TECH
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