Flexible neutron radiation protection material and protective article preparation method

A radiation protection and neutron technology, applied in shielding, nuclear engineering, reactors, etc., can solve problems such as unfavorable protection, high biological toxicity, low melting point and Mohs hardness

Active Publication Date: 2020-03-06
山东双鹰医疗器械有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For protective materials under the action of neutron bombardment for a long time, the deposited radiation energy will cause material changes and the gas swelling effect is obvious, resulting in a short service life of the protective materials
At the same time, the high-density polyethylene material has a very high hydrogen nucleus component, and when it is used as a moderator or shielding material, thermal neutron bombardment is easy to cause 1 H nuclide radiation capture reaction, 1 H(n,γ) 2 H releases high-energy γ-rays (E≈2.2MeV), which is not suitable for radiation protection of high-flux medium-energy and low-energy neutrons
The atomic number of the lead nuclide is 82, and the mass density is 11.3g/cm 3 , the absorption lim

Method used

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  • Flexible neutron radiation protection material and protective article preparation method
  • Flexible neutron radiation protection material and protective article preparation method
  • Flexible neutron radiation protection material and protective article preparation method

Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0065] 1) Neutron source item: According to the actual neutron energy spectrum of the radiation field, an isotropic point neutron source located in the very center of the shield is simulated, and the neutron energy is 0.0253eV for thermal neutrons and 100keV for neutrons Neutrons (neutron production accounted for 70%: 30%).

[0066] 2) Calculation model and material composition. A hollow spherical shield with an inner diameter of 0.5cm and an outer diameter of 2.5cm is established. The shield is divided into 4 layers, and the thickness of each layer is 0.5cm. The ingredients contained in each layer are the same, but the proportion of each mass component are not the same, see Table 1, and the established shielding body model is shown in image 3 . Rare earth mineral powders contain natural radionuclides, including 238 U0.74%; 232 Th1.23%; 226 Ra0.51%; 40 K1.13%, purchased from Sichuan Jiangtong Rare Earth Co., Ltd., natural rubber is a kind of natural polymer compound wit...

experiment example 2

[0074] 1) Neutron source item: According to the actual neutron energy spectrum of the radiation field, an isotropic point neutron source located in the very center of the shield is simulated, and the neutron energy is 0.0253eV for thermal neutrons and 100keV for neutrons Neutrons (neutron production accounted for 70%: 30%).

[0075] 2) Calculation model and material composition. A hollow spherical shield with an inner diameter of 0.5cm and an outer diameter of 2.5cm is established. The shield is divided into 4 layers, and the thickness of each layer is 0.5cm. The ingredients contained in each layer are the same, but the proportion of each mass component Not the same, as shown in the above example, see Table 2.

[0076] Table 2. The mass composition of the shielding material components of the neutron source (thermal neutron and neutral neutron) model

[0077]

[0078] 3) Result analysis

[0079] There are two types of energy neutrons produced by the point neutron source. ...

experiment example 3

[0083] Neutron-photon mixed radiation field evaluation. The shielding effects of two kinds of neutron flexible shielding materials on photons were compared, see Figure 10 and Figure 11 . It can be seen that the shielding body doped with tungsten-nickel alloy has better shielding performance on photons than that of aluminum alloy doped material.

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Abstract

The invention discloses a flexible neutron radiation protection material. The material comprises four layers of structures, wherein the first-layer structure comprises the materials in parts by weight: 10 to 40 parts of rare earth mineral powder, 1 to 20 parts of a tungsten-nickel alloy and 50 to 90 parts of natural rubber; the second-layer structure comprises the materials in parts by weight: 5 to 20 parts of rare earth mineral powder, 50 to 80 parts of natural rubber, 5 to 20 parts of aluminum and 5 to 30 parts of a tungsten-nickel alloy; the third-layer structure comprises the materials inparts by weight: 50 to 100 parts of natural rubber, 5 to 25 parts of aluminum and 5 to 40 parts of a tungsten-nickel alloy; and the fourth-layer structure comprises the materials in parts by weight: 1-10 parts of gadolinium, 50-85 parts of natural rubber, 20-40 parts of aluminum and 2-10 parts of B4C. The material provided by the invention has certain radiation resistance, and can meet the radiation protection requirements of personnel, equipment and devices especially when working in places with complex nuclear radiation backgrounds near strong neutron radiation sources such as nuclear reactors and the like.

Description

technical field [0001] The invention relates to a radiation protection material, in particular to a flexible neutron radiation protection material and a preparation method of a protective article. Background technique [0002] The rapid development of nuclear energy and nuclear technology application industry has promoted the continuous progress of radiation protection material manufacturing technology. From the perspective of radiation protection in a broad sense, radiation protection materials refer to materials that can absorb or dissipate radiation energy and protect the human body or equipment. Material properties are divided into rigid (such as concrete protective walls, lead-steel protective materials, glass bodies, etc.) or flexible (such as lead-containing protective rubber, resin, etc.) and other protective materials. In traditional radiation protection materials, a large number of lead, cadmium, chromium, phenols, and epoxy resin organic substances are used as th...

Claims

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Application Information

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IPC IPC(8): G21F1/10G21F1/12B29B7/00B29C35/02B29C43/24B29C43/58
CPCB29B7/005B29B7/007B29C35/02B29C43/245B29C43/58B29C2043/5816G21F1/106G21F1/125
Inventor 王英曹磊兰长林戚大军郭少嘉林志凯洪博戚玮许凤奎潘小东
Owner 山东双鹰医疗器械有限公司
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