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A fast neutron spectrum measurement system and method

A measurement system and fast neutron technology, applied in the field of radiation detection, can solve the problems of low measurement accuracy and complex system, and achieve the effects of high measurement accuracy, easy radiation shielding, and easy realization

Active Publication Date: 2019-06-07
PEKING UNIV +1
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Problems solved by technology

[0003] In order to overcome the problems of low measurement accuracy and complex system in the prior art, the present invention provides a new measurement system and method for fast neutron energy spectrum

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  • A fast neutron spectrum measurement system and method
  • A fast neutron spectrum measurement system and method
  • A fast neutron spectrum measurement system and method

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Embodiment Construction

[0026] Let the neutron energy range to be measured be E 0 ~E n , according to the measurement accuracy requirements and system resolution, it is divided into several energy intervals [E 0 ,E 1 ),[E 1 ,E 2 ),...,[E n-1 ,E n ], each interval [E j-1 ,E j ] energy in E j Approximately, the intensity distribution is represented by x j means (j=1,2,...,n), then X=(x 1 ,x 2 ,...,x n ) is the desired neutron energy spectrum distribution. The simulated calculation or experimental measurement of the incident neutron energy takes E in turn j The Doppler broadening energy spectrum formed by the characteristic gamma rays produced by the reaction with the target nucleus in the gamma spectrometer, and the system response function matrix H j (E γ )(j=1,2,...,n). Gamma pulse amplitude distribution H j (E γ ) is a function of gamma ray energy E γ function of the gamma spectrometer pulsed multi-channel analyzer in H i,j The form is given, i is the track site corresponding to ...

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Abstract

The invention provides a fast neutron spectrum measurement system and method. The system mainly comprises a target material and a gamma spectrum instrument, wherein a to-be-measured neutron and nuclide in the target material react to generate characteristic gamma rays having the Doppler-broadening effect, and to-be-measured neutron spectrum can be acquired through measuring and analyzing the broadening gamma pulse amplitude spectrum. The system is advantaged in that the system is simple and simple, neutron spectrum measurement is converted into gamma spectrum measurement, and high measurement precision is realized.

Description

technical field [0001] The invention belongs to the field of radiation detection, and in particular relates to a fast neutron energy spectrum measurement system and method. Background technique [0002] Neutron energy spectrum is the intensity distribution of neutrons according to energy. Its accurate measurement is a key technology in the field of radiation detection, and it is also a difficult problem. Common neutron spectrum measurement methods are based on Bonner sphere detectors or liquid scintillator detectors, but the accuracy is not high. In particular, Bonner sphere detectors need to process a series of moderators with different thicknesses, making the system complex. Contents of the invention [0003] In order to overcome the problems of low measurement accuracy and complex system in the prior art, the present invention provides a new measurement system and method for fast neutron energy spectrum. [0004] Based on a conventional gamma spectrometer, the inventio...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01T3/00
CPCG01T3/001
Inventor 卢毅张国辉王志敏白怀勇张陆雨江浩雨
Owner PEKING UNIV
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