Flexible neutron radiation protection material and protective article preparation method

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...

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 limit of the lead K shell layer is 88keV, and the absorption limit of the L layer is 40keV, and there is a weak photon absorption region (40keV~88keV), which is unfavorable for the protection of secondary inelastic scattering and captured photons

In addition, heavy metals such as lead, cadmium and chromium have high biological toxicity. Lead and its compounds can be deposited in human bones and brain organs for a long time, replacing calcium in calcium phosphate and causing biological damage. Cadmium and chromium compounds can cause cancer ; Lead alloy also has the characteristics of relatively low melting point and low Mohs hardness, poor machining performance, and belongs to the radiation protection material that will be eliminated

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