Protective container

 

(57) Abstract:

Usage: in the nuclear industry. The inventive container is made in the form of a vertical glass cover. The container has a double membrane, the inner layer which is made of a composite material of the following composition, wt. %: polystyrene 10-15; polymethylsiloxane lead the rest, and the outer layer is made of polyethylene. The container is provided with a bayonet catch. 1 C.p. f-crystals, 1 Il., table 4.

The invention relates to the nuclear industry, in particular for the manufacture of radiation-protective containers from CT x-ray and gamma radiation and Assembly on the basis of the transport packagings for the transport of radioactive substances.

Known protective metal container with double metal walls (lead or steel), filled in between with polyurethane foam [1] the Disadvantage of this technical solution is the lack of reliable sealing, resulting in the danger of radiological leaks. This means that there have not been completely solved the problem of protecting humans and the environment.

The closest in technical essence and the achieved result is protect izgotovlenie of the metal lead [2] in accordance with the requirement THAT 95.656-79.

The disadvantage of this protective container is not sufficiently high reliability sealing, and therefore the possibility of a radiation leak, the environmental risk of contact staff with metallic lead and chemical corrosion (dissolution) in acidic and alkaline environments. The latter circumstance makes it difficult decontamination of lead containers.

The purpose of the invention to increase the reliability of sealing, environmental and radiation safety protective containers KT intended for storage and transport of radioactive sources.

This goal is achieved thanks to the fact that radiation-protective shell of the container is made of two-layer polymer shell: a protective polymer composite of high impact polystyrene, such as the brand MTC (GOST 28250-89) filled with highly dispersed hydrophobic oligomer - polymethylsiloxane lead in the following ratio, wt.

Polystyrene 10-15

Polymethylsiloxane lead the Rest

and the outer layer (shell) made of polyethylene with a bayonet catch. Used low-density polyethylene (HDPE).

The filler for polistirena particles is not more than 2 μm, in which atomic lead is chemically bound in the siloxane chain (=Si-O-Pb-O)nand does not represent a biological hazard. In terms of the elementary composition of the lead content in the filler is me. Polymethylsiloxane lead has hydrophobic properties, i.e., not wetted by water (increases waterproofing properties) and it is compatible with the polystyrene matrix.

Polystyrene composition with polymethylsiloxane lead is a thermoplastic mass, being formed in items (parts of the container, the Cup and cover) by hot pressing.

Thus, the proposed protective container differs from the known containers replacement of metallic lead to a new type of two-layer thermoplastic polymer composition.

The technical essence of the invention is illustrated in the drawing.

Protective container consists of a cylindrical glass 1 with the cover 2. It is made of two-layer polymer membranes: the inner protective 3 and the outer shell 4. Inside the shell of the Cup 1 and the lid 2 is the cavity (chamber) 5 for insertion of a retail container 6 with a radioactive substance. Between the lid and the Cup is rubber seal 7., the e is fixed, for example by using foam pads 8. The container is equipped with bayonet catch 9.

For testing radiation-protective properties of the protective layer were made five samples of the material proposed in the present invention (see tab. 1).

The test results radiation-protective properties of the samples listed in table. 1, are presented in table. 2.

The thickness of the outer layer of polyethylene covering not less than 2 mm

From table. 2 shows that the polymer composite is made of the proposed protective container has a high radiation-protective characteristics. With respect to the metal lead radiation-protective properties below just in 3-3,5 times. However, given that the density polymer composite (3,85-3,9 g/cm3) 2.9 times less in comparison with the density of lead (11,34 g/cm3), equivalent protection is achieved by increasing the thickness of the protective layer of polymer composite container just 2-2,4 times (table. 3). So we offer you the type of protective container, for example CT-Bel adequate well-known container CT or container CT-Bel adequate container CT and so on (table. 3). Mass adequate types of containers (proposed and known) ptx2">

From table. 4 shows that the proposed protective container has a high reliability seal, and therefore a higher radiation safety without elements of the outer transport packaging (protective packaging type TOO). In known protective container KT reliable sealing is ensured only if the packaging transport kit thanks to the sealing metal Bank (GOST 5981-82), at the opening of which is broken sealing of the container at the workplace.

Thus, the proposed protective container is a work complex reusable and durable. This is due to its chemical indifference (in contrast to the known protective container against acidic and alkaline aqueous solutions, which allows, if necessary, to carry out the decontamination of the container data solutions.

The proposed container provides and environmental safety work in accordance with the norms of the SES when working with lead materials.

Technical efficiency of the proposed solutions is to achieve high technological process thermoplastic molding materialsscience in the production of protective containers that will contribute to the improvement of working conditions.

Application of the proposed technical solution will significantly expand the range of radiation-protective containers.

1. Protective container made in the form of a vertical cylindrical Cup with lid, characterized in that it is made of double-layer polymeric shell, in which the inner protective layer using the polymer composite polystyrene-filled polymethylsiloxane lead in the following ratio, wt.

Polystyrene 10 15

Polymethylsiloxane lead the Rest

and the outer layer sheath made of polyethylene.

2. The container under item 1, characterized in that provided with a bayonet catch.

 

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