BE493942A - - Google Patents

Description

       

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   METHOD OF MANUFACTURING NOTRAM CONNSTRUCTION MATERIALS
CONCRETE MENT, FOR PROTECTION AGAINST PENETRANT RADIATION.
The present invention relates to a process for the manufacture of materials, of construction absorbent for various radiations: neutrons, gamma rays, x-rays, alpha rays, beta rays.
These materials are based on binders, to which are added radiation absorbing products.

   These binders can be aerial or hydraulic, such as concrete, mortar, cement, plaster, anhydrite or the like; can also be used as binders, Synthetic resins, Magnesian cement, Zinc cement, Silicates, Asphalt, Betume, Tar or the like-
In a large number of applications it is necessary to have a Radiation-absorbent Building Material capable of producing harmful biological actions.
For example, in the case of atomic energy generators, you have to protect yourself against Neutrons and Gamma Rays, which are produced in large quantities.

   In other cases, especially in Therapeutic applications of Radium or in the use of X-rays for Radiodiagnosis and for Radiotherapy, it is important to protect against Radiation.
As a result, for example, in atomic energy production installations, the protection of personnel assigned to handling operations and of persons staying in the vicinity must be ensured.
For a long time it was considered that protection against Gamma Rays and against X-Rays was provided by the interposition of a sufficient thickness of lead or a heavy metal.

   Protection against Neutrons appears to be 'at best assured by the interposition of plates of paraffin, water of sufficient thickness or the hydrogenated medium.
Fairly good protection can also be achieved against Gamma Rays by ordinary concrete, provided sufficient thicknesses are available. This same concrete under the same conditions also already provides some protection against Neutrons.

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These various methods known to date, however, in practice have multiple drawbacks. They are bulky and expensive. Lead, which protects against Gamma Rays, absorbs relatively little Neutrons.



  Paraffin which absorbs Neutrons is practically transparent to Gamma Rays, Ordinary Concrete requires often prohibitive thicknesses. -
The object of the present invention is a manufacturing process which, while obviating the drawbacks of the processes known to date, makes it possible to obtain a Construction Material which provides, under an admissible thickness, at the same time protection against Neutrons. and against Gamma Rays.



  For this purpose, a special uniform concrete with a dense structure, very absorbent for the various radiations, is made; offering high resistance, having regular and normal mass hardening and at low cost.
For this purpose, according to the invention, the raw materials used for the manufacture of concrete consist of:
1) binder; added at the same time of fine elements (sand), of larger elements (stones, etc.); or Asbest; or Iron filings; ouanalogues.-
2) absorbent medium for Neutrons, for this purpose, either Boron or a Boron compound is used;

   either Cadmium or one of the compounds of Cadmium, in fine distribution.
According to the invention, the fine elements (sand) and the coarse elements (stones) of the mixture will preferably be from the category of compact, heavy elements at high density, such as barite, barite or the like. The coarse elements (stones) of the mixture can be replaced by the fine elements (sand) compact and heavy.
According to the invention, the boron can be replaced by any other form of industrial product containing boron, boron glass for example, or a suitable boron compound in fine distribution.

   Cadmium can also be introduced into the mass in the form of an industrially manufactured product containing Cadmium or one of the Cadmium compounds in fine distribution.
According to the invention, the absorbents can be used, for example, in the form of a seed or powder, or else of pieces of suitable size.
Example 1.- Stone 4,800 Kgs., Sand 1,300 Kgs., Cadmium sulfate 100 Grs., Cement 700 Grs., Water 300 cm3.-
Example 2. - Crushed baryl 12.Kgs., Barite sand 2.500 Kgs., Cadmium oxide 125 Grs., Cement 1.750 Kgs., Water 700 cm3
Example 3. - Crushed Barite Sulfate-15,300 Kgs., Baryte Sulfate Sand 3 Kgs., Boron Carbide 75 Grs.

   Cement 2.100 Kgs., Water 900 cm3 .-
Example 4.- Barite 7.650 kgs. Boric acid 90 Grs., Plaster 1.100 Kgs., Water 525 cm3.-
Example 5.- Barite 6.250 Kgs., Boric acid 100 Grs., Asphalt 2.100 Kgs., Tar 120 Grs.- @
It goes without saying that the above numerical indications are given only by way of example, not limiting .-
CLAIMS.

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Claims (1)

1) Manufacturing process for Construction Materials, absorbent for various Radiations: Neutrons, Gamma Rays, X Rays, Alpha Rays, Beta Rays, with binders solidifiable by setting, such as Concrete, Mortar, Cement, Plaster, Anhydrite, Lime, Synthetic Resins, Magnesian Cement, Zinc Cement, Silicates, Asphalt, Bitumen, Tar, or the like, characterized by the fact that it is incorporated binders or materials solidifiable by setting, boron or cadmium, or one of their compounds. <Desc / Clms Page number 3> 2) Method according to claim 1, characterized that the raw materials usually used for the manufacture of concrete, mortars; or asbestos or fiber cement mortars, for example, boron or one of the boron compounds, or cadmium or one of the cadmium compounds are added. - 3) Method according to claims 1 and 2, characterized in that the raw materials used in the manufacture of concretes, mortars, will preferably be of the category of stones, sands, compacts, heavy at very high density, for example, of barite, barite; iron shot or the like. 4) Method according to claims 1 to 3, characterized in that the boron can be replaced by any other form of industrial products, containing boron or a boron compound, for example, from glass to boron. 5) Method according to claims 1 to 4, characterized in that the cadmium can also be introduced into the mass in the form of an industrially produced product, containing cadmium or a compound of cadmium. - 6) Process for manufacturing Construction Materials with a compact and dense structure, absorbent for the various radiations: Neutrons, Gamma rays, X-rays, Alpha rays, Beta rays, as described above. -