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Plutonium material gamma radiation field calculating method

A calculation method and radiation field technology, applied in radiation measurement, neutron radiation measurement, measurement devices, etc., can solve problems such as inability to monitor, low gamma ray energy, and inability to carry out radiation safety assessments for workers

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

However, the energy of gamma 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 carry out radiation safety assessment for workers , then 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. When operating highly enriched plutonium, it is not appropriate to use a simple point source attenuation model due to the short distance from the source, so another calculation method should be considered to solve the problem
The present invention proposes a method for calculating the gamma radiation field of highly enriched plutonium materials, which solves the problems of rationality, scientificity, and accuracy of the calculation of the gamma radiation field of highly enriched plutonium materials, and provides a basic basis for staff radiation safety assessment

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  • Plutonium material gamma radiation field calculating method
  • Plutonium material gamma radiation field calculating method
  • Plutonium material gamma radiation field calculating method

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Embodiment Construction

[0034] Below is a spherical highly enriched plutonium material with a diameter of 2 mm ( 239 The attenuation of γ-rays emitted by Pu with an abundance greater than 90% in water is taken as an example to illustrate the method for calculating the γ-radiation field described in this paper.

[0035] 1. Analysis of Radiation Characteristics of Highly Enriched Plutonium Materials

[0036] Highly enriched plutonium material mainly contains 239 Pu and a small amount 240 Pu, 241 Pu and 241 Am, can emit α, β, X, γ rays. also, 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.

[0037] 2. Analysis of the formation mechanism of highly enriched plutonium gamma radiation field

[0038] Taking into ac...

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Abstract

The invention relates to a plutonium material gamma radiation field calculating method, which comprises the following steps: analyzing radionuclides and possible emitted rays in plutonium material; analyzing energy and intensity of gamma rays emitted by each radionuclide in the plutonium material; taking proportion of the radionuclides into overall consideration, and calculating fission gamma emission rate and surface emission rate; and through analysis of radionuclide characteristics, ray characteristics and structural material of plutonium, calculating external gamma ray air absorption doserate of the plutonium material.

Description

technical field [0001] The invention relates to a method for calculating the penetrating radiation field, and more specifically relates to a method for calculating the gamma radiation field of highly enriched plutonium material. Background technique [0002] Highly enriched plutonium materials can produce gamma 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 gamma 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 carry out radiation safety assessment for workers , then it is necessary to theoretically calculate the penetrating radiation field of highly enriched plutonium. To ensu...

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Application Information

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