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A temperature-controlled fluid neutron spectrometer, its measurement method, and analysis and processing system

A technology of a neutron spectrometer and a measurement method, applied in the field of neutron energy spectrum measurement, can solve the problems of inability to detect neutrons above 20MeV, mutual interference of detection systems, poor compliance in high-energy regions, etc.

Active Publication Date: 2022-03-01
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention provides a temperature-controlled fluid neutron spectrometer, its measurement method, and an analysis and processing system. The technical problem to be solved is: the conventional multi-sphere neutron spectrometer cannot detect neutrons above 20 MeV, and multiple detection systems in the multi-sphere detector Mutual interference and inconvenient use, and the poor coincidence of the high-energy region due to the insufficient number of spectral equations and the reliance on genetic algorithms for the prompt gamma neutron spectrometer

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  • A temperature-controlled fluid neutron spectrometer, its measurement method, and analysis and processing system
  • A temperature-controlled fluid neutron spectrometer, its measurement method, and analysis and processing system
  • A temperature-controlled fluid neutron spectrometer, its measurement method, and analysis and processing system

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Embodiment 1

[0063] It is known that neutrons and different nuclides in other substances will undergo capture (n, γ) and inelastic scattering reactions (n, n'γ). In a short time (less than 10-13s), characteristic gamma rays are emitted. The detection of thermal neutrons can obtain the energy spectrum information of the neutron field to be measured through the energy and intensity information of thermal neutrons, or detect the energy and intensity of characteristic gamma rays. If the material and structure of the substance are known, use the characteristic The energy and intensity information of gamma rays can also obtain the energy spectrum information of the neutron field to be measured.

[0064] Based on the characteristics of the above-mentioned neutrons, a temperature-controlled fluid neutron spectrometer provided by the present invention includes at least a base, a fluid chamber and a detector fixed on the base, and a fluid pool communicated with the fluid chamber; The fluid chamber ...

Embodiment 2

[0076] see Figure 8 , the present embodiment provides a measurement method of a temperature-controlled fluid neutron spectrometer, which can be applied to a temperature-controlled fluid neutron spectrometer described in Embodiment 1, comprising the steps of:

[0077] S1. According to the thermal neutron counts or prompt gamma counts of the neutron field to be measured measured by the detector 5 in different temperature ranges, calculate the thermal neutron count rate or gamma characteristic peak count rate and compile it into a corresponding response matrix.

[0078] The step S1 specifically includes:

[0079] Heating fluid 8, using neutron detector 5 to measure T in M ​​temperature intervals M The actual counting rate of thermal neutrons is obtained by counting the thermal neutrons generated in the fluid chamber 9 followed by Compiled into M actual count rate matrices with 1 row and j columns;

[0080] Alternatively, use the gamma ray detector 5 to measure T in m tempe...

Embodiment 3

[0110] Embodiment 3 of the present invention also provides an analysis and processing system 10 of a temperature-controlled fluid neutron spectrometer, which can be used in the temperature-controlled fluid neutron spectrometer described in Embodiment 1, such as Figure 9 As shown, it includes a signal collection unit 101 , a data processing unit 102 and a display unit 103 connected in sequence.

[0111] The signal collection unit 101 is used to connect to the detector 5 of the temperature-controlled fluid neutron spectrometer, so as to obtain the thermal neutron count or instantaneous gamma count and fluid temperature measured by the detector 5 . The signal collection unit 101 can adopt a data transmission line to be connected between the signal output end of the detector 5 and the signal input end of the data processing unit 302; Interactively, the corresponding pulse signal can be obtained.

[0112] The data processing unit 102 is used to perform the measurement method of a...

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Abstract

The invention relates to the field of neutron energy spectrum measurement, and specifically discloses a temperature-controlled fluid neutron spectrometer, a measurement method, and an analysis and processing system. The temperature-controlled fluid neutron spectrometer includes a fluid chamber filled with fluid, a detector surrounded by the fluid chamber, a heating element for heating the fluid, etc., thereby realizing changing the fluid density in the fluid chamber by controlling the temperature and improving the The sensitivity of neutrons above 10MeV can realize the energy spectrum measurement of 0-1000MeV thermal neutrons; the same detector is used for measurement, and there is no problem of mutual interference between multiple measuring instruments; at the same time, the temperature control method is used to change the fluid density, which can quickly form a A series of continuous moderator fluids of different densities provides a sufficient number of measurements for spectrum resolution. The measurement method, based on a sufficient number of measured values ​​provided by the detector, adopts a function simulation method to construct a response matrix and a characteristic equation to obtain the neutron energy spectrum, which ensures the accuracy and stability of the measurement, and solves the problem that the high-energy region meets poor degree problem.

Description

technical field [0001] The invention relates to the field of neutron energy spectrum measurement, in particular to a temperature-controlled fluid neutron spectrometer, a measurement method, and an analysis and processing system. Background technique [0002] In order to protect the health of radiation workers, the public, sympathizers and visitors, and monitor the normal operation of nuclear facilities, it is necessary to analyze the neutron flux and neutron energy spectrum (the distribution of neutron flux rate with energy in nuclear facilities and the environment) ) to measure. [0003] Nowadays, multi-sphere neutron spectrometers, namely Bonner spheres, are mostly used to measure neutron energy spectra. It uses neutron detectors with polyethylene moderator spherical shells of different thicknesses to measure them sequentially. However, it is mainly aimed at neutrons within the energy range of 20 MeV, and has low measurement sensitivity for high-energy neutrons above 20 M...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01T3/00G01T1/36
CPCG01T3/00G01T1/365G01T1/36
Inventor 杨剑波王昌铭庹先国成毅王洪辉李锐彭颖
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING