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A neutron energy spectrum measurement device and method based on prompt gamma ray neutron activation analysis technology

A technology of gamma rays and neutrons, applied in the field of radiation detection

Active Publication Date: 2021-10-19
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a new detection method and system for neutron energy spectrum measurement, which overcomes the shortcomings of traditional neutron energy spectrum measurement methods by means of prompt gamma ray neutron activation analysis technology

Method used

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  • A neutron energy spectrum measurement device and method based on prompt gamma ray neutron activation analysis technology
  • A neutron energy spectrum measurement device and method based on prompt gamma ray neutron activation analysis technology

Examples

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Embodiment 1

[0029] Measurement of the neutron energy spectrum of the Am-Be source neutron field

[0030] In this example, the neutron spectrum of the Am-Be source neutron field is measured. First, a standard sample is prepared. Composed of 5% boron-containing polyethylene plates, the size of each part is 10cm×10cm, and the sodium chloride solution is placed in a container made of plexiglass. The structure and material of the standard sample are shown as figure 2 shown. The surface of the sample is 20cm away from the surface of the BGO scintillator detector, and a metal bismuth plate with a thickness of 5cm is used around the detector to shield gamma rays from other sources. Select the characteristic peaks of 5 elements in the standard sample, and divide the neutron energy range to be measured into J energy groups. Under this geometric arrangement, use the Monte Carlo method to simulate the response function R i (E j ), that is, the count rate of the i-th characteristic peak produced ...

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Abstract

The invention relates to a neutron energy spectrum measurement device and method based on prompt gamma ray neutron activation analysis technology, which uses a gamma ray detector to measure a standard sample containing multiple elements placed in a neutron field to obtain each The characteristic peak count rate N of the element; the standard sample with known content of each element is prepared and the response function R(E) of each characteristic peak count rate in the detector to neutrons of different energies is obtained by Monte Carlo simulation; the measured The count rate of each characteristic peak can be expressed as the cumulative sum of the product of the response function and the corresponding neutron fluence rate, and the neutron fluence rate of each energy range can be obtained by solving the above equations, so as to realize the measurement of neutron energy spectrum. The invention makes the neutron energy spectrum measurement simpler, economical and time-saving through the preparation of the standard sample and the simulation of the Monte Carlo method, and at the same time ensures higher measurement accuracy.

Description

technical field [0001] The invention relates to the field of radiation detection, in particular to a neutron energy spectrum measurement device and method based on prompt gamma ray neutron activation analysis technology. Background technique [0002] In neutron detection, in addition to neutron flux measurements, the distribution of neutron fluence rate with energy - ie neutron energy spectrum - is often required. Neutron energy spectrum measurement is a basic research in neutron physics, which is of great significance to nuclear physics research. The measurement accuracy of the traditional commonly used neutron spectrum measurement methods is generally not high and each has its own limitations. For example, the Bonner sphere method needs to add moderator layers of different thicknesses to multiple thermal neutron sensitive detectors, and then obtain their response functions separately, which is expensive and the system is complex. [0003] Prompt gamma ray neutron activat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01T3/00G01N23/222
CPCG01N23/222G01T3/00
Inventor 黑大千贾文宝赵冬程璨李佳桐蔡平坤孙爱赟汤亚军
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS