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Method for predicting experiment result of screen-grid ionization chamber for measuring neutron-induced nuclear reaction

An experimental result and ionization chamber technology, applied in the field of radiation detection, can solve problems such as inability to identify, fail in experiments, and not found, and achieve the effect of small computer resource occupation, simple calculation method, and easy implementation.

Pending Publication Date: 2021-05-28
PEKING UNIV
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Problems solved by technology

The particles produced by these interference reactions will all contribute to the energy spectrum finally measured by the ionization chamber (that is, the energy-corresponding count relationship measured by the anode and cathode of the ionization chamber) due to the deposition of energy in the ionization chamber and being detected, while the ionization The energy spectrum measured in the chamber is the sum of the contributions of the reaction to be measured and all other interference reactions, so if the energy spectra of the interference reaction and the nuclear reaction to be measured overlap, it may not be possible to distinguish them, so that the energy spectrum obtained by the experimental measurement cannot be found at all. The particle of the nuclear reaction to be tested, which finally caused the experiment to fail

Method used

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  • Method for predicting experiment result of screen-grid ionization chamber for measuring neutron-induced nuclear reaction
  • Method for predicting experiment result of screen-grid ionization chamber for measuring neutron-induced nuclear reaction
  • Method for predicting experiment result of screen-grid ionization chamber for measuring neutron-induced nuclear reaction

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Embodiment Construction

[0043] The method of the present invention will be described below through specific examples, but the present invention is not limited thereto.

[0044] This example uses a double screen grid ionization chamber pair 58 Ni(n,α) 55 Fe reaction is measured, and the measured particles are 58 Ni(n,α) 55 α particles produced by Fe reaction, the sample used is pure 58 Ni foil samples, neutrons are accelerated by the 4.5MV electrostatic accelerator of Peking University and deuterium ion beams bombard the deuterium gas target to generate 2 H(d,n) 3 The He reaction is obtained, and the layout of the double-screen ionization chamber measurement experiment is as follows figure 2 shown. The experimental plan is to measure neutron energy at 5.00 MeV 58 Ni(n,α) 55 Fe reaction, this is the reaction to be measured, and the α particles produced by this reaction are the particles to be measured. Simultaneously, 58 After the Ni sample is irradiated by 5.00MeV neutrons, it will also occ...

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Abstract

The invention discloses a method for predicting an experiment result of a screen-grid ionization chamber for measuring a neutron-induced nuclear reaction. The method comprises the steps of obtaining the energy of charged particles generated by a to-be-measured reaction and other possible interference reactions, the emergent direction information, and the energy loss and range information of the charged particles through a Monte Carlo simulation method, and quantitatively obtaining the energy-counting relationship of the emergent particles of the reaction to be measured. By changing simulation conditions such as sample thickness, working gas type in an ionization chamber, air pressure, neutron energy and the like, a corresponding energy-counting relationship for reflecting the emergent charged particles is obtained, so that an experiment result is more visually obtained through the relationship, and various experiment conditions are optimized. The method can guide the formulation of an ionization chamber nuclear reaction measurement experiment plan, and can determine the measurement efficiency.

Description

technical field [0001] The invention belongs to the field of radiation detection, and in particular relates to a method for predicting experimental results of neutron-induced reactions measured in an ionization chamber. Background technique [0002] Screen ionization chamber (hereinafter referred to as ionization chamber) is used to measure fast neutrons (neutron energy E n >1MeV) induced light charged particle exit nuclear reaction, such as (n,α) reaction common detector. The inside of the ionization chamber is filled with working gas (generally more than 90% inert gas + less than 10% polyatomic gas, such as CO 2 or H 2 ), and mainly consists of a cathode and two anodes, two shielding poles and two grids, a total of 7 parallel plates, forming a structure of shielding pole-anode-grid-cathode-grid-anode-shielding pole , the main concern in the experimental measurement is the cathode and the anode, so the cathode and the anode are mainly discussed in this specification, ...

Claims

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Application Information

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IPC IPC(8): G01T1/36G01T1/38
CPCG01T1/36G01T1/38
Inventor 崔增琪江浩雨张国辉白怀勇王志敏胡益伟刘杰白浩帆
Owner PEKING UNIV
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