Protective container

 

(57) Abstract:

Use: in the manufacture of radiation-protective containers for storage and transport of radioactive sources. The inventive protective container is made in the form of a vertical lead of a cylindrical Cup with a lid. The container has an outer two-layer membrane inner layer which is made of polymeric compositions in the following ratio, wt.%; polystyrene 8-15; polyethylsiloxane sodium 0,5-1; iron oxide rest, and the outer polyethylene. 1 C.p. f-crystals, 4 tab., 1 Il.

The invention relates to the nuclear industry, in particular for the manufacture of radiation-protective containers KT intended for storage and transport of radioactive sources.

Known protective container with double metal walls (lead or steel), filled in between with polyurethane foam [1] the Disadvantage of this solution is that during transportation of the container is not reliable sealing, and therefore remains the danger of radiation that is harmful to the environment.

The closest tekhnicheskiky vertical glass cover (cork), made of metal lead [2] in accordance with the requirement THAT 95.656-79.

The disadvantage of this protective container, made on the basis of metallic lead, is the fact that when E > 100 Kev the photoabsorption process is accompanied by the emission characteristic of the induced radiation, whose energy is 90 Kev. In addition, these containers without transport packaging does not provide a reliable seal, and therefore radiation safety. Health regulations prohibited contact the exposed parts of the body with metallic lead.

The technical result increased radiation-protective properties, reliability sealing and environmental protective containers CT.

This is because a protective lead container includes an optional external double-layer thermoplastic membrane made of a polymer protective composite on the basis of high impact polystyrene brand UPM (GOST 28250-89), filled with modified politicaleconomy sodium (TU-6-02-696-86) and finely dispersed iron oxide in the following ratio, wt.

Polystyrene 8-15

Polyethylsiloxane intothree is I (HDPE) with inetnum gate.

Used superfine iron oxide (FeO, hematite), previously heat-treated at 500oC-modified politicaleconomy sodium in a ball mill (particle size of 5-10 microns). Modification of iron oxide is made for compatibility of the filler with a non-polar polystyrene matrix. Polystyrene composition with modified iron oxide is a thermoplastic mass, being formed in a part of the container (glass cover) by hot pressing.

The outer layer sheath made of polyethylene with a thickness of 1-2 mm, can be decorative.

Thus, the proposed protective container differs from the known container by creating an additional double-layer protective thermoplastic shell around a lead glass (tube) to ensure the full integrity of the container.

The drawing shows the proposed protective container.

The container consists of lead glass 1 and the lead cover 2. Lead glass 1 and the lead cover 2 outside has a two-layer shell: inner 3, 4 and outer 5, 6. Inside the Cup 1 has a camera 7, and places the consumer packagings 8 with a radioactive substance. From the diagram, the inner shell 4 and the outer shell 6 are thermoplastic tube. In the joint between thermoplastic glass and thermoplastic tube is a rubber seal 9. The exterior of the container is provided with a bayonet catch 10. The free space in the chamber 7 after insertion of a retail container 8 with a radioactive substance is filled bulk sorbent.

For testing properties of the material of the inner protective sheath was made five samples (see tab.1)

The test results radiation-protective properties of the samples listed in table.2.

In table. 3 shows the protective properties of the various types offered and known containers

From table.2 shows that the protective polymer composition on the basis of polystyrene filled with iron oxide has a relatively high linear attenuation coefficient of photon radiation in a wide energy range of the spectrum, especially in the x-ray range. This protective polymer composite can significantly reduce the emission of characteristic guidance from the lead wall radiation 1,02 cm-1).

At an energy characteristic of the guidance) is the first screen in the following form:(see tab.3).

From table. 3 shows that the proposed protective container provides significant absorption emission characteristic induced by a lead radiation with an energy of 90 Kev. As a result, the exposure dose rate at the external surface of the container reaches the background level (15-16 μr/h conditions of the experiment) that has no place in the known container. For other levels of energies of gamma rays from radioactive sources placed in the proposed protective container is provided by reducing the exposure dose rate on the outer surface of the container by 20-40% compared with the known container.

Protective polymer shell made of composite material based on high impact polystyrene, filled with modified iron oxide has a high physical-mechanical and chemical characteristics: mechanical compressive strength not less than 70 MPa, water absorption not more than 0.1 wt. heat resistant up to 150oC; full chemical resistance to acid and alkaline solutions.

The outer plastic shell to offer protective container with bayonet catch provides complete sealing of the container (bubble test method for P=1 aclocal radiation protection indicators almost ensures a complete sealing of the container, the possibility of holding (if necessary) decontamination of the exterior surface of the container, prevents environmental hazard upon contact staff with lead. Significantly improves the appearance of the container.

The application of the proposed technical solutions will allow us to expand the range of protective containers will improve the radiation situation and working conditions.

1. Protective container made in the form of a vertical lead of a cylindrical Cup with lid, characterized in that it further includes an outer two-layer membrane, the inner layer which is made of a polymer composite in the following ratio of components, wt.

Polystyrene 8 15

Polyethylsiloxane sodium 0,5 1

Iron oxide Rest

and the outer polyethylene.

2. The container under item 1, characterized in that the outer plastic shell executed with bayonet catch.

 

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