JP2021051017A - Radiation shielding method, radiation shielding structure, and clay with lead balls - Google Patents

Abstract

To provide a radiation shielding technique involving the use of a radiation shielding member that can be easily manufactured and transported.SOLUTION: A radiation shielding method of the present invention comprises mixing a plurality of lead balls with clay to produce clay with lead balls, filling gaps between radiation shielding walls with the clay with lead balls, and curing the clay with lead balls so as to shield radiation at the gaps with the clay with lead balls.SELECTED DRAWING: Figure 3

Description

The present invention relates to a radiation shielding technique.

There are radiation devices that emit radiation for various purposes. Radiation devices include X-ray imaging devices that irradiate patients with X-rays for diagnostic imaging of lesions, radiotherapy devices that irradiate affected areas with X-rays or gamma rays for treatment of affected areas, and X-rays of the atomic structure of samples. There is an X-ray diffractometer that irradiates a sample with X-rays for analysis by line diffraction. In the radiation equipment room where the radiation equipment is installed, it is necessary to shield the radiation indoors.

As a radiation shielding method, there is a method in which a wall having a hollow inside is provided and a radiation shielding member is filled inside the wall (for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 9-21169

The above method has a problem that the production of the wall is very costly and time consuming. As a radiation shielding method, a method of providing a lead plate for shielding radiation in a room is generally known.

FIG. 1 is a perspective view showing lead plates 21, 22, 100 for shielding radiation.
When the lead plates 21 and 22 are used indoors for shielding radiation, a gap 23 is formed at the joints of the lead plates 21 and 22. In order to prevent radiation from leaking from the gap 23, a lead plate 100 is installed on one of the lead plates 21 and 22 so as to cover the gap 23. The lead plate 100 is configured by laminating a plurality of lead plates 100A to 100C having a predetermined thickness according to the required shielding amount of radiation corresponding to the gap 23. The lead plates 100A to 100C are adhered with tape or the like. The lead plate 100A of the base is wider than the lead plates 100B and 100C to be laminated. In order to reduce the amount of lead plate used, a lead plate having a width as short as 100C of the upper layer is used.

This method has a problem that a plurality of lead plates 100A to 100C having different widths must be produced.

FIG. 2 is a perspective view showing lead plates 21, 22, 110 for shielding radiation.
In order to prevent radiation from leaking from the gap 23, it is conceivable to use a lead plate 110 having a thickness corresponding to the assumed maximum size of the gap 23. In this case, there is a problem that the weight of the lead plate 110 becomes larger than necessary, which causes a great disadvantage in production and transportation.

An object of the present invention is to provide a radiation shielding technique using a radiation shielding member that is easy to produce and transport.

The gist of the present invention is as follows.
(1) Multiple lead balls are mixed with clay to produce clay containing lead balls.
The clay containing lead balls is filled in the gaps of the radiation shielding wall, and the clay is filled.
A radiation shielding method in which the lead ball-containing clay is hardened and radiation is shielded in the gap by the lead ball-containing clay.
(2) In the radiation shielding method according to (1), the clay is a radiation shielding method in which two agents, a prepolymer of an epoxy resin and a curing agent, are mixed.
(3) Multiple lead balls are mixed with clay to produce clay containing lead balls.
Apply the clay containing lead balls on the wall and
A radiation shielding method in which the lead ball-containing clay is hardened and radiation is shielded by the lead ball-containing clay.
(4) Multiple lead balls are mixed with clay to produce clay containing lead balls.
The clay containing lead balls is laminated on the outer surface of the housing including the curved surface portion, and the clay is laminated.
A radiation shielding method in which the lead ball-containing clay is hardened and the radiation to the article is shielded by the lead ball-containing clay.
(5) Multiple lead balls are mixed with clay to produce clay containing lead balls.
The clay containing lead balls was laminated over the entire outer surface of the article,
A radiation shielding method in which the lead ball-containing clay is hardened and the radiation to the article is shielded by the lead ball-containing clay.
(6) Multiple lead balls are mixed with clay to produce clay containing lead balls.
A radiation shielding method in which the clay containing lead balls is poured into a mold and radiation is shielded by the clay containing lead balls.
(7) In the radiation shielding method according to any one of (3) to (6), the clay is a liquid clay.
(8) In the radiation shielding method according to any one of (1) to (7), the radiation shielding method in which the diameter of the lead ball is 0.1 to 0.5 mm.
(9) Radiation shielding wall with a gap and
A clay containing clay and a plurality of solid lead balls mixed with the clay, filling the gaps and shielding radiation in the gaps, and a clay containing lead balls.
Radiation shielding structure with.
(10) A clay containing lead balls, which contains clay and a plurality of solid lead balls mixed with the clay, and can block radiation in the gaps by being filled in the gaps of the radiation shielding wall and cured.
(11) A clay containing a clay and a plurality of solid lead balls mixed with the clay, which is hardened while covering the entire outer surface of the article and shields radiation to the article.
(12) Multiple lead balls are mixed with clay to produce clay containing lead balls.
The clay containing lead balls is poured into the box body through the opening of the box body, and the clay is poured into the box body.
A method for manufacturing a shielding member, which manufactures a shielding member that shields radiation by closing the opening with a closing member.
(13) Clay and clay containing lead balls containing a plurality of solid lead balls mixed with the clay,
A radiation shielding member including a box-shaped member for accommodating the clay containing lead balls inside.

It is a perspective view which shows the lead plate 21, 22, 100 for shielding the radiation in the conventional example. It is a perspective view which shows the lead plate 21, 22, 110 for shielding the radiation in the conventional example. It is a figure which shows the radiation shielding structure 1 using the clay 3 containing a lead ball in 1st Embodiment. It is a figure which shows the radiation shielding structure 1A in the 2nd Embodiment. It is a figure which shows the radiation shielding structure 1B in 3rd Embodiment. It is a figure which shows the radiation shielding structure 1C in 4th Embodiment. FIG. 5 is a cross-sectional view of a housing 41 in which clay 3D containing lead balls is laminated in the fifth embodiment. It is sectional drawing of the structure which covers the housing 41 in the conventional example with lead plates 120 to 122. It is sectional drawing of the clay 3E containing a lead ball laminated on the article 42 in 6th Embodiment. It is sectional drawing of the radiation shielding member 8 in 7th Embodiment. It is sectional drawing for demonstrating the radiation shielding method in 8th Embodiment.

Hereinafter, embodiments will be described with reference to the drawings.
(First Embodiment)
The lead ball-containing clay 3 shown in FIG. 3B can be used as a shielding member for radiation such as X-rays, gamma rays, and beta rays. As shown in FIG. 3A, the lead ball-containing clay 3 is produced by mixing a plurality of lead balls 31 with the clay 32. As the lead ball 31, a solid lead ball 31 having a diameter of 0.1 to 0.5 mm and having a predetermined value within a range of 0.1 to 0.5 mm is used. The diameter of the lead ball 31 is preferably 0.1 to 0.5 mm. When the diameter of the lead ball 31 is 0.5 mm or less, the lead ball 31 can be arranged sufficiently densely, and the radiation shielding ability of the lead ball-containing clay 3 can be improved. If the diameter of the lead ball 31 is 0.1 mm or more, the lead ball 31 on the market can be used (the lead ball 31 having a diameter smaller than 0.1 mm is difficult to obtain because it is a special one).

As long as the clay 32 can be mixed with lead balls 31 and can be filled in gaps and holes in the wall and hardened after the filling, an appropriate material can be used. Clay 32 can also be rephrased as an adhesive or putty. Here, an example in which epoxy clay is used as the clay 32 will be described. Clay 32 is a mixture of an epoxy resin prepolymer and a curing agent. The clay 32 may also be a rubber material, and lead balls 31 may be added to the rubber (clay 32) in the manufacturing process. Further, the clay 32 may be a resin such as a thermoplastic polyethylene resin, and is soft at a temperature higher than the glass transition point (melting point) and has fluidity, and solidifies at a temperature lower than the glass transition point. There may be. An appropriate material can be used as the clay 32. In the present embodiment, the clay 32 that can be kneaded and can maintain a three-dimensional shape is used.

The density of the lead spheres 31 with respect to the clay 32 is preferably 60% or more from the viewpoint of ensuring a sufficient radiation shielding ability. The density of the lead balls 31 may be adjusted to a preferable value according to the usage pattern of the clay 3 containing lead balls. For example, when the lead ball-containing clay 3A and 3D are applied to the wall portion 11 (second embodiment) and laminated on the housing 41 (fifth embodiment), the density of the lead ball 31 is the lead ball-containing clay 3A and 3D. May be adjusted to a value that adheres well to the wall portion 11 or the housing 41.

FIG. 3C is a cross-sectional view showing the radiation shielding structure 1.
The radiation shielding structure 1 is a wall structure of a radiation apparatus room in which a radiation apparatus such as a dental X-ray imaging apparatus is installed. In the radiation shielding structure 1, lead plates 21 and 22 are provided on the indoor side of the wall portions 11 and 12 of the radiation apparatus room as a shielding wall for radiation such as X-rays by bonding with tape or the like. As a result, the radiation shielding structure 1 is designed to prevent radiation from leaking to the outside.

Here, at the inside corners of the wall portions 11 and 12, the lead plates 21 and 22 are adjacent to each other in a posture orthogonal to each other. A gap 23 is formed between the lead plates 21 and 22 along the vertical direction of the paper surface in FIG. 3C due to the seams of the lead plates 21 and 22 and the like. In this case, radiation may leak from the gap 23 to the outside.

Therefore, the worker mixes the epoxy resin prepolymer and the curing agent at the site to produce clay 32. Then, the worker mixes a plurality of lead balls 31 with the clay 21 to generate the clay 3 containing lead balls.

Subsequently, the worker fills the entire gap 23 of the lead plates 21 and 22 with the lead ball-containing clay 3 before the lead ball-containing clay 3 is cured. The worker cures the lead ball-containing clay 3 by leaving the lead ball-containing clay 3 for a curing time set in the clay 32 or by heating the lead ball-containing clay 3 to a set temperature.

In the present embodiment, the clay 3 containing lead balls can shield the radiation in the gap 23, and can prevent the radiation from leaking from the gap 23 to the outside. In the present embodiment, the lead ball-containing clay 3 is used as the radiation shielding member. As the lead ball-containing clay 3, commercially available clay 32 and lead ball 31 can be used, so that the production is easy.

Conventionally, lead plates 100 and 110 (FIGS. 1 and 2) have been provided as radiation shielding members for the gap 23, and the lead plates 100 and 110 are large and difficult to transport. In the present embodiment, the lead ball-containing clay 3 is used as the shielding member of the gap 23. Since the lead ball-containing clay 3 only needs to be able to fill the gap 23, the required volume of the gap 23 as the radiation shielding member is larger than that of the conventional one. It can be significantly reduced.

Further, since the raw materials clay 32 and lead ball 31 have indefinite shapes, they can be put in an appropriate container and easily transported to the site. And clay 32 is lighter than lead. From the above, the lead ball-containing clay 3 (clay 32 and lead ball 31) as the shielding member of the gap 23 is much easier to transport to the site than the conventional ones (lead plates 100 and 110).

In the present embodiment, the gap 23 may be filled with a very lightweight clay 3 containing lead balls, so that the construction becomes much easier than before. In this embodiment, the slurry-like clay 3A containing lead balls, which will be described later, may be used.

(Second Embodiment)
FIG. 4B is a diagram showing a radiation shielding structure 1A.
In the radiation shielding structure 1A, the lead ball-containing clay 3A is applied to the indoor side of the wall portion 11 of the radiation device room, and the layer of the lead ball-containing clay 3A prevents leakage of radiation to the outside.

As shown in FIG. 4 (A), the lead ball-containing clay 3A is produced by mixing lead balls 31A having a diameter within a range of 0.1 to 0.5 mm, which is roughly aligned with a predetermined value, with the clay 32A. Clay 32A is a milky liquid synthetic resin emulsion clay in which fine particles of a water-insoluble synthetic resin are dispersed and mixed in water. The plasticity of the synthetic resin emulsion clay is lower than that of the epoxy clay of the first embodiment. The clay 32A may be any liquid clay having properties as a fluid before solidification, and in addition to synthetic resin emulsion clay, epoxy resin-based, synthetic resin-based, acrylic resin-based, urethane resin-based, silicon resin-based, etc. It may be a liquid agent (liquid clay) such as a fluororesin type. The liquid agent (liquid clay) may be a one-component agent or a two-component agent used by mixing a curing agent with a main agent. The same applies to the following embodiments.

At the site, for example, the worker puts clay 32A and lead ball 31A in a bucket 91 and mixes the clay 32A and lead ball 31A with a spatula 92 or the like to generate clay 3A containing lead balls in a slurry form. As shown in FIG. 4B, the worker applies the lead ball-containing clay 3A to the indoor side of the wall portion 11 of the radiation apparatus room with a spatula 92 or the like. The worker hardens the lead ball-containing clay 3A by drying the lead ball-containing clay 3A by leaving it to stand or the like, and forms a layer of the lead ball-containing clay 3A on the wall portion 11. The thickness of the layer may be adjusted depending on how much radiation leakage is desired from the irradiation amount of radiation and the like, and may be set according to the purpose.

In the present embodiment, radiation can be shielded by a layer of clay 3A containing lead balls on the wall portion 11. By forming the lead ball-containing clay 3A over the entire indoor side of the wall portion 11, a layer of lead ball-containing clay 3A can be formed as a radiation shielding member instead of the lead plates 21 and 22. To form the layer of the clay 3A containing lead balls, it is only necessary to apply the clay 3A containing lead balls to the wall portion 11 with a spatula 92 or the like, and the construction is easy. This embodiment also has the advantage that commercially available clay 32A and lead ball 31A can be used as raw materials for the clay 3A containing lead balls, and that the production is easy and that the clay 32A and lead balls 31A are easily transported to the site. In addition to completely shielding the radiation, shielding the radiation may be described as meaning to reduce the amount of passing radiation.

(Third Embodiment)
FIG. 5 is a diagram showing a radiation shielding structure 1B.
In the radiation shielding structure 1B, the wall portion 11 of the radiation apparatus room includes an R-shaped wall portion 11B which is a side wall. The lead plates 21 and 22 cannot be attached to the outer curved surface of a round bend or a circular object, and cannot be attached to the R-shaped wall portion 11B. Therefore, conventionally, it has been difficult to provide a shielding member on the R-shaped wall portion 11B.

In the present embodiment, the lead ball-containing clay 3B is provided on the R-shaped wall portion 11B as a radiation shielding member. In the present embodiment, the lead ball-containing clay 3B is made into a slurry in which lead balls are mixed with liquid clay, which is an epoxy resin-based liquid agent, so that it can be applied and easily provided on the wall portion 11B. The lead ball-containing clay 3B may be made by mixing lead balls with epoxy clay or the like that can maintain a three-dimensional shape. In this case as well, the lead ball-containing clay 3B follows the outer surface shape of the wall portion 11B. Is good, so it can be easily provided on the wall portion 11B. In the present embodiment, in the R-shaped wall portion 11B, the leakage of radiation to the outside can be prevented by the layer of the clay 3B containing lead balls.

FIG. 5 shows a state in the middle of the installation work of the clay 3B containing lead balls on the wall portion 11B. As the clay 3B containing lead balls, an appropriate one can be used as long as the lead balls and clay are mixed. It is preferable to use iron balls having a diameter approximately equal to a predetermined value within the range of 0.1 to 0.5 mm. Lead plates 21 and 22 may be provided on the flat wall portion 11 as radiation shielding members, or clays 3, 3A and 3B containing lead balls may be provided. When the lead plates 21 and 22 are provided, the clay 3 containing lead balls may be filled at the joints of the lead plates 21 and 22.

(Fourth Embodiment)
FIG. 6 is a diagram showing a radiation shielding structure 1C.
In the radiation shielding structure 1C, the wall portion 11C of the ceiling has a dome shape, and the clay 3C containing lead balls is provided on the wall portion 11C as a radiation shielding member. FIG. 6 shows a state in the middle of the installation work of the clay 3C containing lead balls on the wall portion 11C. As the clay 3C containing lead balls, a slurry in which lead balls are mixed with liquid clay is used so that it can be easily applied. As the clay 3C containing lead balls, a mixture of epoxy clay or the like capable of maintaining a three-dimensional shape and lead balls may be used.

Also in this embodiment, in the dome-shaped wall portion 11C, the leakage of radiation to the outside can be prevented by the layer of clay 3C containing lead balls. Lead plates 21 and 22 and clays 3, 3A to 3C containing lead balls may be provided on the flat wall portion 11 as radiation shielding members.

(Fifth Embodiment)
FIG. 7 is a cross-sectional view of the housing 41 in which the clay 3D containing lead balls is laminated.
In the radiation shielding method (method for manufacturing a radiation shielding structure) of the present embodiment, the worker first mixes a plurality of lead balls with clay to produce clay 3D containing lead balls. As the clay 3D containing lead balls, a slurry in which lead balls are mixed with liquid clay is used, but a clay in which lead balls are mixed with epoxy clay or the like capable of maintaining a three-dimensional shape may be used.

Subsequently, the worker stacks the lead ball-containing clay 3D on the outer surface of the housing 41 (article) by coating on the region including the curved surface portion 411. When the lead ball-containing clay 3D using epoxy clay or the like is used, the lead ball-containing clay 3D may be directly attached to the outer surface of the housing 41, or may be attached to the outer surface of the housing 41 using an adhesive, tape, or the like. .. The same applies to the third and fourth embodiments when the lead ball-containing clays 3B and 3C using epoxy clay or the like are used.

Examples of the housing include a housing 41 of a device that is expected to be used indoors in a radiation device, a housing 41 of a device that emits radiation, for example, a housing 41 of a nuclear reactor. It is particularly effective to laminate the lead ball-containing clay 3D on the outer surface of the housing 41 in the region including the curved surface portion 411, but the clay 3D may be laminated on the outer surface of the housing 41 in the region including only the flat portion.

Subsequently, the worker hardens the lead ball-containing clay 3D by drying or the like to form a layer of the lead ball-containing clay 3D on the housing 41. In the present embodiment, the radiation to the housing 41 is shielded by the clay 3D containing lead balls.

As shown in FIG. 8, conventionally, when the housing 41 is covered with the lead plates 120 to 122, the lead plates 120 to 122 are attached to the outer surface of the housing 41. At the joint portion between the adjacent lead plates 120 to 122, for example, the ends of the lead plates 120 to 122 are overlapped with each other in order to prevent radiation leakage. For example, the ends of the lead plates 122 on the curved surface portion 411 are overlapped on the ends of the lead plates 120 and 121 on both sides. In this configuration, the lead plate 122 on the curved surface portion 411 has poor followability to the curved surface portion 411, becomes an uneven shape, creates a gap between the lead plate 122 and the curved surface portion 411, and reduces the radiation shielding ability.

In the present embodiment, since the clay 3D containing lead balls is used as the radiation shielding member, the productivity and transportability are good as described above. Moreover, since the lead ball-containing clay 3D has good followability to the curved surface portion 411, radiation can be better shielded by installing the lead ball-containing clay 3D than by installing the lead plates 120 to 122.

(Sixth Embodiment)
FIG. 9A is a cross-sectional view of the lead ball-containing clay 3E laminated on the article 42, and FIG. 9B is a cross-sectional perspective view of the lead ball-containing clay 3E laminated on the article 42.
In the radiation shielding method of the present embodiment, the worker first mixes a plurality of lead balls with clay to produce clay 3E containing lead balls.

Subsequently, the worker stacks the lead ball-containing clay 3E on the entire outer surface of the article 42. In the present embodiment, the article 42 is a spherical article, but an appropriate article 42 can be used. When a slurry of lead balls mixed with liquid clay is used as the lead ball-containing clay 3E, the lead ball-containing clay 3E can be laminated on the entire outer surface of the article 42 by immersing the article 42 in the lead ball-containing clay 3E in the container. .. When a lead ball-containing clay 3E obtained by mixing lead balls with an epoxy clay or the like capable of maintaining a three-dimensional shape is used, the lead ball-containing clay 3E is laminated on the outer surface of the article 42 by attaching, pasting, or the like.

Subsequently, the worker hardens the lead ball-containing clay 3E by drying or the like to form a layer of the lead ball-containing clay 3E on the entire outer surface of the article 42. The clay 3E containing lead balls laminated on the article 42 in this way contains clay and a plurality of solid lead balls mixed with the clay, and is cured in a state of covering the entire outer surface of the article 42. In the present embodiment, the lead ball-containing clay 3E shields the radiation to the article 42.

In the present embodiment, the lead ball-containing clay 3E having good followability to the surface shape is used as the radiation shielding member for covering the article 42. Therefore, the clay 3E containing lead balls can be adhered to and laminated on the entire surface of the article 42, and radiation can be well shielded.

(7th Embodiment)
FIG. 10A is a cross-sectional view of the radiation shielding member 8.
The radiation shielding member 8 can be transported and installed at a desired location. For example, the radiation shielding member 8 can be used as a radiation shielding wall by stacking along the inner wall of the radiation apparatus room. Further, the radiation shielding member 8 can be used to cover a portion that cannot be covered by the radiation shielding wall or a gap in the radiation shielding wall.

The radiation shielding member 8 includes clay and a clay containing lead balls 3F containing a plurality of solid lead balls mixed with clay, and a box-shaped member 43 containing the clay 3F containing lead balls inside. As the lead ball-containing clay 3F, for example, a slurry using liquid clay can be used. The box-shaped member 43 includes a box main body 431 having an opening 4311 at the upper end, and a closing member 432 that closes the opening 4311.

In the radiation shielding method of the present embodiment, the worker first mixes a plurality of lead balls with clay to generate clay 3F containing lead balls, and as shown in FIG. 10 (B), the clay 3F containing lead balls is used in the box body 431. Pour into the box body 431 through the opening 4311. Then, as shown in FIG. 10A, the worker can manufacture the radiation shielding member 8 that shields radiation by closing the opening 4311 with the closing member 432.

(8th Embodiment)
FIG. 11 is a cross-sectional view for explaining a radiation shielding method.
The worker first mixes a plurality of lead balls with clay to produce clay 3G containing lead balls. As the ball-filled clay 3G, for example, a slurry using liquid clay can be used.

Subsequently, the worker pours the lead ball-containing clay 3G into the mold 44 and shields the radiation with the lead ball-containing clay 3G. The formwork 44 can be installed, for example, on the inner wall of the radiation equipment room or on the outside of the nuclear reactor. The formwork 44 refers to a wall-like structure having a hollow inside. A radiation shielding structure 1G is formed by including a lead ball-containing clay 3G and a mold 44.

In the present embodiment, since the ball-filled clay 3G is installed by flowing the slurry-shaped ball-filled clay 3G through the mold 44, the ball-filled clay 3G can be thickly installed on the radiation shielding wall.

(Modification example)
The diameters of the lead balls 31, 31A may be smaller than 0.1 mm, larger than 0.5 mm, and may be, for example, 0.05 mm, 1 mm, 2 mm, or 5 mm. The diameter of the lead ball 31 does not have to be uniform to a predetermined value. The diameter of the lead ball 31A does not have to be uniform to a predetermined value.

As lead ball-containing clays 3,3A to 3G clays 32,32A, gypsum-based clays that start to harden when kneaded with water are used, calcium carbonate-based clays that harden when dried are used, or polyester. Polyester-based clay produced by mixing two agents, a resin prepolymer and a curing agent, may be used. As clays 3, 3A to 3G containing lead balls, depending on the size, location, and shape of the target area to be painted or laminated, use a slurry-like clay that is easy to apply, or one that can maintain its shape and be cured. You just have to decide. Further, the hardness of the lead ball-containing clays 3, 3A to 3G before solidification and the hardness after solidification can be appropriately set depending on the material of the clays 32 and 32A.

The lead ball-containing clays 3, 3A to 3G may be provided on an appropriate radiation shielding wall such as lead plates 21 and 22 in order to improve the radiation shielding ability. The lead ball-containing clays 3, 3A to 3G may be provided outside the wall portions 11, 11B, 11C of the radiation apparatus room.

3,3A-3G ... Clay with lead ball, 11,11B, 11C ... Wall part, 21,22 ... Lead plate (radiation shielding wall), 23 ... Gap, 31,31A ... Lead ball, 41 ... Housing, 42 ... Article, 43 ... Box-shaped member, 44 ... Formwork, 411 ... Curved surface, 431 ... Box body, 4311 ... Opening.

Claims (13)

Multiple lead balls are mixed with clay to produce lead ball-containing clay.
The clay containing lead balls is filled in the gaps of the radiation shielding wall, and the clay is filled.
A radiation shielding method in which the lead ball-containing clay is hardened and radiation is shielded in the gap by the lead ball-containing clay. The radiation shielding method according to claim 1, wherein the clay is a mixture of a prepolymer of an epoxy resin and a curing agent. Multiple lead balls are mixed with clay to produce lead ball-containing clay.
Apply the clay containing lead balls on the wall and
A radiation shielding method in which the lead ball-containing clay is hardened and radiation is shielded by the lead ball-containing clay. Multiple lead balls are mixed with clay to produce lead ball-containing clay.
The clay containing lead balls is laminated on the outer surface of the housing including the curved surface portion, and the clay is laminated.
A radiation shielding method in which the lead ball-containing clay is hardened and the radiation to the housing is shielded by the lead ball-containing clay. Multiple lead balls are mixed with clay to produce lead ball-containing clay.
The clay containing lead balls was laminated over the entire outer surface of the article,
A radiation shielding method in which the lead ball-containing clay is hardened and the radiation to the article is shielded by the lead ball-containing clay. Multiple lead balls are mixed with clay to produce lead ball-containing clay.
A radiation shielding method in which the clay containing lead balls is poured into a mold and radiation is shielded by the clay containing lead balls. The radiation shielding method according to any one of claims 3 to 6, wherein the clay is a liquid clay. The radiation shielding method according to any one of claims 1 to 7, wherein the lead ball has a diameter of 0.1 to 0.5 mm. Radiation shielding walls with gaps and
A clay containing clay and a plurality of solid lead balls mixed with the clay, filling the gaps and shielding radiation in the gaps, and a clay containing lead balls.
Radiation shielding structure with. A clay containing a clay and a plurality of solid lead balls mixed with the clay, and the clay containing the lead balls capable of shielding radiation in the gaps by filling and hardening the gaps of the radiation shielding wall. A clay containing clay and a plurality of solid lead balls mixed with the clay, which is hardened while covering the entire outer surface of the article and shields radiation to the article. Multiple lead balls are mixed with clay to produce lead ball-containing clay.
The clay containing lead balls is poured into the box body through the opening of the box body, and the clay is poured into the box body.
A method for manufacturing a shielding member, which manufactures a shielding member that shields radiation by closing the opening with a closing member. Clay and clay containing lead balls containing multiple solid lead balls mixed with the clay,
A radiation shielding member including a box-shaped member for accommodating the clay containing lead balls inside.

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