JP2002071885A - Radiation shielding material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radiation shielding material capable of forming the material into an appropriate shape so as to be used in various kinds of parts, and appropriately shielding the radiation corresponding to the kind and the intensity of the radiation to be shielded. SOLUTION: The radiation shielding material 10 is formed by using a plastic sheet 1 containing radiation shielding inorganic substances 3 in a plastic 2, and laminating the plastic sheet 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radiation shielding material used for shielding radiation, the radiation shielding material being formed into an appropriate shape so that it can be used in various places, and the radiation to be shielded. Corresponding to the type and strength of
The present invention relates to a radiation shielding material capable of appropriately shielding radiation.

[0002]

2. Description of the Related Art Conventionally, various radiation shielding materials have been used for shielding radiation. Conventionally, such radiation shielding materials are generally made of water, heavy concrete, polyethylene resin or the like. Hydrogen-containing substances,
Iron, lead, cadmium, tungsten, mercury, platinum, boron, lithium and the like have been used.

[0003] When using such a radiation shielding material, it is necessary to form the radiation shielding material into an appropriate shape using the above-mentioned materials and use it.
Depending on the type of material used, there were problems such as difficulty in molding the radiation shielding material into an appropriate shape.

Conventionally, as disclosed in Japanese Patent Application Laid-Open No. 52-127597, a boron compound or A sheet-shaped radiation shielding material having flexibility formed by adding a boron compound coated with a polyethylene resin at a predetermined ratio to an olefin resin, or as disclosed in JP-A-52-131097. In addition, a sheet-shaped radiation shielding material having flexibility which is formed by adding a lithium compound or a lithium compound coated with a polyethylene resin at a predetermined ratio to an olefin resin has been proposed.

However, when the radiation shielding material is simply formed into a sheet, it is difficult to appropriately shield the radiation in accordance with the intensity of the emitted radiation. When such radiation is emitted, there is a problem that various kinds of radiation cannot be appropriately shielded.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems in a radiation shielding material used for shielding radiation, and to form the radiation shielding material into an appropriate shape. It is an object of the present invention to make it applicable to various places and to appropriately shield radiation in accordance with the type and intensity of the radiation to be shielded.

[0007]

According to the first radiation shielding material of the present invention, in order to solve the above-mentioned problems, a plastic sheet containing a radiation shielding inorganic material in plastic is laminated. It was molded.

[0008] When a plastic sheet containing a radiation-shielding inorganic material in plastic is laminated and molded as in the first radiation-shielding material of the present invention, the plastic is made to correspond to the intensity of the radiation to be shielded. By appropriately changing the amount of the radiation shielding inorganic substance contained in the sheet, the number of plastic sheets to be laminated, and the like, radiation of various intensities can be appropriately shielded.

In the second radiation shielding material according to the present invention, in order to solve the above-mentioned problem, a plastic sheet containing a radiation shielding inorganic material in plastic is formed into a three-dimensional shape. It was.

In the third radiation shielding material according to the present invention, at least one plastic sheet containing a radiation shielding inorganic material in plastic and a lead sheet are laminated and molded.

Here, by appropriately changing the kind of the radiation shielding inorganic substance contained in the plastic sheet, various kinds of radiation such as α-ray, β-ray, γ-ray, X-ray, electron beam, neutron beam and the like can be obtained. It becomes possible to properly shield the radiation of various kinds.

In using the first and third radiation shielding materials according to the present invention, when molding the radiation shielding material into an appropriate three-dimensional shape, the plastic sheet is molded into a three-dimensional shape. It can be obtained by laminating plastic sheets molded into a sheet.

Here, when the plastic sheet constituting the radiation shielding material is formed into a three-dimensional shape, the plastic sheet can be formed into a predetermined three-dimensional shape by a simple forming method such as thermoforming. By stacking the plastic sheets thus formed, a radiation shielding material having an appropriate three-dimensional shape can be easily obtained.

Here, the type of plastic used for the plastic sheet is not particularly limited,
As described above, the plastic sheet can be easily formed, and it is preferable that the plastic itself has a radiation shielding property.For this reason, an aliphatic hydrocarbon polymer is used, and more preferably, polyethylene or polypropylene is used. To be used.

As the radiation shielding inorganic substance used for the plastic sheet, known inorganic substances generally used conventionally can be used. Examples thereof include lithium compounds, boron compounds, lead and lead compounds. One or two or more types can be used, and they are appropriately selected and used in accordance with the type of radiation to be shielded.

In the case where various types of radiation are emitted, a plurality of types of plastic sheets containing different types of radiation shielding inorganic materials are laminated to form a radiation shielding material, and each of the plastic sheets is formed. Corresponding radiation can be shielded by the radiation shielding inorganic substance contained in the sheet. Here, when shielding various types of radiation, in consideration of the intensity and characteristics of each radiation and the type of radiation shielding inorganic substance contained in each plastic sheet, etc., the number of laminated plastic sheets and the number of laminated plastic sheets Preferably, the order is determined.

Further, when the plastic sheet contains a material that emits fluorescence by radiation, the plastic sheet emits fluorescence when the radiation is guided to the plastic sheet, and thus the material that emits fluorescence by radiation is contained. By using the combined plastic sheets, it becomes possible to confirm the shielding state of radiation.

Here, as a material that emits fluorescence by radiation, a conventionally known material can be used, for example, calcium tungstate or zinc sulfide activated with a metal such as silver, copper, manganese, or lead. Etc. can be used.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a radiation shielding material according to an embodiment of the present invention will be specifically described with reference to the accompanying drawings.

In this embodiment, as shown in FIG. 1, a plastic sheet 1 made of polyethylene or polypropylene containing a radiation shielding inorganic material 3 made of a lithium compound, a boron compound, lead or a lead compound. Was used.

Then, as shown in FIG. 2, a plurality of (four in the example shown) plastic sheets 1a to 1d in which the radiation shielding inorganic substance 3 is contained in the plastic 2 as described above are laminated. Radiation shielding material 10 in plate shape
I got

Here, each of the plastic sheets 1a to 1d
The types of the plastics 2 and the types of the radiation shielding inorganic substances 3 used in the above may be the same or different, and a plurality of radiation shielding inorganic substances 3 may be added to each of the plastic sheets 1a to 1d. It may be.

Further, it is also possible to add a material which emits fluorescence by radiation to the plastic sheet 1a or 1d on one side of the radiation shielding material 10, so that the radiation shielding state can be confirmed.

In the radiation shielding material 10 of this embodiment, a plurality of plastic sheets 1a to 1a in which the radiation shielding inorganic material 3 is contained in the plastic 2 are provided.
1d was laminated and formed into a plate shape. For example, as shown in FIG. 3, a plastic sheet 1 containing a radiation shielding inorganic substance 3 in a plastic 2 was molded into a thermoforming mold 20. After forming the radiation shielding material 10 having a groove shape by laminating a plurality of (three in the example shown in the figure) plastic sheets 1a to 1c formed in the shape of a groove. It is also possible to get.

[0025]

As described in detail above, the radiation shielding material of the present invention is formed by laminating plastic sheets containing a radiation shielding inorganic substance in plastic, so that the intensity of radiation to be shielded is increased. Corresponding to, the amount of radiation shielding inorganic substances contained in the plastic sheet, the number of plastic sheets to be laminated and the like can be appropriately changed, and radiation of various intensities can be appropriately shielded, By appropriately changing the type of radiation shielding inorganic material contained in plastic, various types of radiation such as α-rays, β-rays, γ-rays, X-rays, electron beams, and neutron rays can be appropriately shielded. Became.

In the radiation shielding material according to the present invention, the plastic sheet constituting the radiation shielding material is formed into a three-dimensional shape by a simple molding method such as thermoforming, and the plastic sheets thus molded are laminated. By doing so, a radiation shielding material having an appropriate three-dimensional shape can be easily obtained.

In the radiation shielding material according to the present invention, when a plurality of types of plastic sheets containing different types of radiation shielding inorganic substances are laminated, even when various types of radiation are emitted. ,
Each radiation can be properly shielded.

Further, in the radiation shielding material of the present invention, if the plastic sheet contains a material that emits fluorescence by radiation, the plastic sheet emits fluorescence when the radiation is guided to the plastic sheet.
By combining and using a plastic sheet containing a material that emits fluorescence by radiation as described above, the shielding state of radiation can be confirmed.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view of a plastic sheet in which a radiation shielding inorganic material is contained in plastic in a radiation shielding material according to an embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view of a radiation shielding material formed by laminating a plurality of the plastic sheets shown in FIG. 1 into a plate shape in the embodiment of the present invention.

FIG. 3 is an explanatory cross-sectional view showing a state in which the plastic sheet shown in FIG. 1 is formed into a groove-shaped cross section using a thermoforming mold in the embodiment of the present invention.

FIG. 4 is a schematic cross-sectional view of a radiation shielding material formed into a groove by laminating a plurality of plastic sheets formed into a groove as shown in FIG. 3 in the embodiment of the present invention; .

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 1a, 1b, 1c, 1d Plastic sheet 2 Plastic 3 Radiation shielding inorganic substance 10 Radiation shielding material 20 Thermoforming mold

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4F100 AA00B AA00C AA00H AA18B AA30B AA31B AB23A AK01B AK01C AK02B AK02C AK04B AK04C AK07B AK07C BA02 BA03 BA07 BA08 BA10A BA10B J13 J06 J06 J06 J06 J06 J06 FD207 GR01

Claims (9)

[Claims] 1. A radiation shielding material which is formed by laminating plastic sheets containing a radiation shielding inorganic substance in plastic. 2. A radiation shielding material, wherein a plastic sheet containing a radiation shielding inorganic substance in plastic is formed into a three-dimensional shape. 3. A radiation shielding material characterized by being formed by laminating at least one plastic sheet containing a radiation shielding inorganic substance in plastic and a lead sheet. 4. The radiation shielding material according to claim 1, wherein the plastic sheet is formed into a three-dimensional shape, and the plastic sheets thus formed are laminated. 5. The radiation shielding material according to claim 1, wherein the plastic used for the plastic sheet comprises a polymer of an aliphatic hydrocarbon. 6. The radiation shielding material according to claim 1, wherein the plastic used for the plastic sheet is made of polyethylene or polypropylene. 7. The radiation shielding material according to claim 1, wherein the radiation shielding inorganic substance contained in the plastic sheet is selected from a lithium compound, a boron compound, a lead and a lead compound. A radiation shielding material comprising at least one kind of radiation shielding material. 8. The radiation shielding material according to claim 1, wherein a plurality of types of plastic sheets containing different types of radiation shielding inorganic materials are laminated. Characteristic radiation shielding material. 9. The radiation shielding material according to claim 1, wherein at least one plastic sheet to be laminated contains a material that emits fluorescence by radiation. Shielding material.