A kind of flexible neutron radiation protection material and preparation method of protective articles

Abstract

The invention discloses a flexible neutron radiation protection material. The material includes a 4-layer structure. The materials of the first layer structure are 10-40 parts by weight of rare earth ore powder, 1-20 parts by weight of tungsten-nickel alloy and 50-40 parts by weight of rare earth ore powder. 90 parts by weight of natural rubber, the materials of the second layer structure are 5-20 parts by weight of rare earth mineral powder, 50-80 parts by weight of natural rubber, 5-20 parts by weight of aluminum, and 5-30 parts by weight of tungsten-nickel alloy ; The material of the 3rd layer structure is the natural rubber of 50-100 parts by weight, the aluminum of 5-25 parts by weight, the tungsten-nickel alloy of 5-40 parts by weight; The material of the 4th layer structure is the gadolinium of 1-10 parts by weight, 50-85 parts by weight of natural rubber, 20-40 parts by weight of aluminum, 2-10 parts by weight of B 4 C. The material of the invention has certain radiation resistance performance, and can meet the radiation protection requirements of personnel, equipment and devices especially when working near strong neutron radiation sources such as nuclear reactors and where there is a complex nuclear radiation background.

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...

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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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