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Plutonium material neutron radiation field calculating method

A calculation method and radiation field technology, applied in the field of neutron radiation field calculation of highly concentrated plutonium materials, can solve the problems of inability to carry out radiation safety assessment for staff, low energy of neutron rays, and inability to monitor and so on.

Inactive Publication Date: 2018-03-16
NAVAL UNIV OF ENG PLA
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Problems solved by technology

However, the energy of neutron rays emitted by highly enriched plutonium is relatively low, which puts forward higher requirements on the response capability of general radiation monitoring instruments, and in some cases it cannot be monitored (such as in the feasibility demonstration stage), and it is impossible to conduct radiation safety for workers. At this time, it is necessary to theoretically calculate the penetrating radiation field of highly enriched plutonium. To ensure the accuracy and scientificity of the calculation, the diversity of radionuclides and the complexity of energy lines contained in highly enriched plutonium must be considered. At this time, for the staff operating highly enriched plutonium, it is inappropriate to use the simple point source attenuation mode due to the short distance from the source, so another calculation method should be considered to solve the problem
The present invention proposes a calculation method for the neutron radiation field of highly enriched plutonium materials, which solves the problems of rationality, scientificity and accuracy of the calculation of the neutron radiation field of highly enriched plutonium materials, and provides a basic basis for staff radiation safety assessment

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  • Plutonium material neutron radiation field calculating method
  • Plutonium material neutron radiation field calculating method
  • Plutonium material neutron radiation field calculating method

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[0035] Below is a spherical highly enriched plutonium material with a diameter of 2 mm ( 239 Take the attenuation of neutrons emitted by Pu with an abundance greater than 90% in water as an example to illustrate the calculation method of the gamma radiation field described in this paper.

[0036] 1. Analysis of Radiation Characteristics of Highly Enriched Plutonium Materials

[0037] 239 Pu and 240 Pu is a transuranium element that can produce spontaneous fission neutrons. 241 The (α, n) reaction between Am and impurities produces neutrons, so the gamma rays emitted by plutonium, spontaneous fission neutrons, multiplication neutrons and neutrons produced by (α, n) reactions may form external radiation to the staff.

[0038] 2. Analysis of the formation mechanism of highly enriched plutonium gamma radiation field

[0039] The neutrons of plutonium materials are mainly composed of neutrons radiated by spontaneous fission and neutrons released by α decay of plutonium through ...

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Abstract

The invention relates to a plutonium material neutron radiation field calculating method, which comprises the following steps: analyzing radionuclides and possible neutrons in a highly-enriched plutonium material; analyzing a neutron generation mechanism of the highly-enriched plutonium material, and calculating plutonium isotope spontaneous fission radiation neutron yield and neutron yield obtained after alpha released in alpha decay process is subjected to (alpha, n) reaction; and when neutrons pass through unit thickness material, analyzing probability of the neutrons separating from a neutron group higher than some energy threshold and entering a neutron group having lower energy, and based on the removal cross section theory, calculating neutron dose equivalent rate of the highly-enriched plutonium.

Description

technical field [0001] The invention relates to a calculation method for a penetrating radiation field, in particular to a calculation method for a neutron radiation field of highly enriched plutonium material. Background technique [0002] Highly enriched plutonium materials can produce neutron rays with strong penetrating ability, which can cause external radiation hazards to operators. Due to the short contact distance and long time, the radiation hazards are worthy of attention. However, the energy of neutron rays emitted by highly enriched plutonium is relatively low, which puts forward higher requirements on the response capability of general radiation monitoring instruments, and in some cases it cannot be monitored (such as in the feasibility demonstration stage), and it is impossible to conduct radiation safety for workers. At this time, it is necessary to theoretically calculate the penetrating radiation field of highly enriched plutonium. To ensure the accuracy and...

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Application Information

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IPC IPC(8): G01T3/02
CPCG01T3/02
Inventor 朱敏杨永新王丽婷黄桂王宋赵大磊马敬伟詹维徐子剑
Owner NAVAL UNIV OF ENG PLA
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