JP2008101934A - Radiation shielding structure and shielding skeleton - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide radiation shielding structure capable of maintaining stably a radiation shielding effect, capable of reducing a concrete amount required for constructing a wall and an upper floor slab by replacing one-parts of the wall and the upper floor slab constituting a skeleton, with a sediment containing water having the radiation shielding effect, allowing thereby simple structure, and capable of facilitating thereby execution, and a shielding skeleton using the radiation shielding structure. <P>SOLUTION: This radiation shielding structure used at least as one-parts of the wall and the upper floor slab constituting the skeleton for covering a chamber 1 installed with a radiation generating device is provided with an inner plate body 2a arranged in the chamber 1, an outer plate body 2b arranged with a space in an outside of the inner plate body 2a, and a plurality of shielding bodies 3 filled between the inner plate body 2a and the outer plate body 2b, and each of the shielding bodies 3 is filled with the sediment 5 containing the water in a water-tight bag 4, and an opening part 6 of the bag 4 is sealed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a radiation shielding structure used for a building housing in which a radiation generator or the like is installed, and a shielding housing using the same.

Radioisotopes (RIs) and radiation generators are widely used in various fields such as medicine, agriculture, and industry for applications such as radiation diagnosis and treatment, sterilization and sterilization, nondestructive inspection and analysis. .
In buildings of facilities where such radiation generators are installed, a radiation shielding structure is adopted for the housing structure in order to prevent radiation such as high-energy neutrons generated inside from leaking to the external environment. There is a need to.

For this reason, generally in this kind of building, the shielding housing which used the wall and upper floor slab which comprise the housing as the thick reinforced concrete structure excellent in the radiation shielding effect is used.
However, since the radiation is absorbed while being scattered in the reinforced concrete, the thickness dimension of the reinforced concrete for obtaining a desired shielding effect becomes 2 m to 4 m depending on the amount of radiation generated.

  As a result, the above-mentioned shielding housing has a problem in that it has an excessive strength design in terms of structural mechanics, so that the weight of the housing is excessively large, the amount of concrete to be placed is large, and the economy is inferior. In addition, when dismantling due to the aging of the above facilities, there is a problem that a large amount of work is required for operations such as hanging and cutting with a large machine and a large amount of waste concrete is generated.

On the other hand, water is known as a substance having an excellent radiation absorption effect.
Therefore, in the following Patent Document 1, the present inventors laid a water shielding sheet in an upper floor slab of a living room where a radiation generator is arranged, and used a hardener such as soil cement, sand, or the like thereon. The water-impregnated filler is provided in the water-impervious filler, and a water-permeable material excellent in moisture content and water supply efficiency is provided in the water-impervious filler. A shielding structure containing a continuous part from the material was proposed.

According to the shielding structure having the above-described configuration, water in the water storage tank is supplied to the shielding filler by using the capillary phenomenon due to the osmotic pressure of the water-permeable material, and the moisture content is constantly kept constant. It is possible to reduce the amount of concrete required for building a floor slab by using the water shielding effect of water, and the unit volume weight of the shielding filler is constant. By maintaining the thickness, it is possible to obtain an effect of ensuring the filling degree and maintaining the radiation shielding function.
JP-A-10-68797

  However, in the above-described shielding structure, it is necessary to provide a water storage tank or a pipe for sending water from the water storage tank to the shielding filler outside the structure, which increases the equipment cost. There is a problem.

  In addition, the moisture content of the shielding filler must be managed at all times, and there is a problem that a lot of labor is required for maintenance and inspection. Furthermore, in addition to the above-mentioned water shielding sheet, it is necessary to construct a watertight seal between the shielding filler and the surroundings, and there is also a problem that the construction requires a lot of labor and skill,

  The present invention has been made in view of such circumstances, and can stably maintain the radiation shielding effect, and a part of the wall and the upper floor slab constituting the housing can be used for water having a radiation shielding effect. It is possible to reduce the amount of concrete required for constructing the above-mentioned walls and upper floor slabs by replacing them with earth and sand, and use a radiation shielding structure that is simple and easy to construct. It is an object of the present invention to provide a shielded housing.

  In order to solve the above-mentioned problem, the invention according to claim 1 is a radiation shielding structure used as at least a part of a wall of an enclosure and an upper floor slab covering a chamber in which a device for generating radiation is installed. The inner plate disposed on the chamber side, the outer plate disposed on the outer side of the inner plate, and a plurality of shields filled between the inner plate and the outer plate The shielding body is characterized in that a bag having watertightness is filled with earth and sand containing water and the opening of the bag is sealed.

  The invention according to claim 2 is the powdery or granular filler between the plurality of shields filled between the inner plate and the outer plate in the invention according to claim 1. Is closely packed.

  Furthermore, the invention described in claim 3 is a shielding housing that covers a chamber in which a device for generating radiation is installed, and the wall and the upper floor slab covering the chamber are provided with the radiation according to claim 1 or 2. It has a shielding structure.

  According to the shielding structure according to claim 1 or 2, or the shielding casing according to claim 3, the bag is filled with hydrous sand between the inner plate and the outer plate arranged at intervals. In addition, since the plurality of shields whose openings are sealed are filled, a high radiation shielding effect can be obtained by the water in the shield. In addition, because some of the walls and upper floor slabs that make up the frame are replaced by earth and sand containing water that has a radiation shielding effect, the amount of concrete required to construct the walls and upper floor slabs is reduced. Can be reduced.

In addition, it is preferable to use the reinforced concrete or steel plate which is excellent in the radiation shielding effect as said inner side board body and outer side board body.
Further, the inner plate body and the outer plate body are adjusted by appropriately setting the interval between the inner plate body and the outer plate body according to the amount of radiation generated in the room and adjusting the moisture content of the earth and sand in the shield. This can be handled easily without increasing the amount of concrete or the like for constructing.

In addition, since the opening of the bag is hermetically sealed, the shield does not change the moisture content, and therefore has a high radiation shielding effect over a long period of time without separately managing the moisture content or performing maintenance and inspection. Can be obtained stably.
In addition, construction during the construction of the enclosure is easy, and when the enclosure is activated and needs to be dismantled, the earth and sand in the shield is contained in a sealed bag. Construction and waste disposal are easy.

  Here, in particular, according to the invention described in claim 2, since the space between the plurality of shielding bodies between the inner plate body and the outer plate body is further closely filled with a powdery or granular filler, The shielding effect can be improved, and the shielding body can be stably held between the inner and outer plate bodies. In addition, the shield can be easily separated at the time of dismantling.

(First embodiment)
FIG. 1 shows a first embodiment in which the radiation shielding structure according to the present invention is applied to a wall 2 of a casing covering a chamber 1 in which a device for generating radiation is installed.
In FIG. 1 (a), reference numeral 2a is a reinforced concrete inner wall (inner plate) which is disposed on the chamber 10 side and constitutes a part of the wall, and reference numeral 2b is spaced outside the inner wall 1. It is an outer wall (outer plate) made of reinforced concrete. The space between the inner wall 2a and the outer wall 2b is filled with a plurality of shields 3.

  As shown in FIG. 1 (b), the shield 3 is a bag 4 filled with earth and sand 5 containing water, and the opening 6 of the bag 4 is sealed. Here, the bag 4 is made of a synthetic resin having water tightness such as a waterproof sheet in which a polymeric plasticizer is blended with a vinyl chloride resin, for example, and the size thereof is similar to that of a general sandbag bag or a cement bag. For example, about 50 cm × 30 cm × 10 cmH and a thickness of about 1.5 mm is preferable.

  Moreover, the earth and sand 5 filled in this bag 4 is not specifically limited, For example, the field excavation soil generated at the time of construction can be used. At this time, if the properties of the excavated soil are constant to some extent, it is not necessary to pass through a sieve. The shielding body 3 is configured by filling the bag 4 with water after the earth and sand 5 are contained therein, and further sealing the opening 6 of the bag 4. In addition, as a method of sealing the opening 6, for example, two sheets constituting the opening of the bag 4 after the earth and sand filling are welded by an electric iron (sealer) having a length equal to or larger than the width of the bag 4. -The method of integrating etc. can be used.

Further, between the plurality of shields 3 filled between the inner wall 2a and the outer wall 2b, for example, a powdery or granular filler 7 such as fine sand is densely filled.
And the space | interval of the inner wall 2a and the outer wall 2b with which the shielding body 3 and the filler 7 are filled is set by radiation shielding calculation based on the radiation dose generated from the radiation generator (not shown) installed indoors. Yes.

(Second Embodiment)
FIG. 2 shows a second embodiment in which the radiation shielding structure according to the present invention is applied to an upper floor slab 10 of a casing covering a chamber 1 in which a device for generating radiation is installed, and is shown in FIG. The same components as those in FIG.
In FIG. 2, reference numeral 10 a is a reinforced concrete lower slab (inner plate) that is arranged on the chamber 1 side of the housing and constitutes a ceiling portion, and reference numeral 10 b is spaced above the lower floor slab 10. It is the upper slab (outer plate body) of the reinforced concrete structure arrange | positioned in this.

  A space is formed between the lower slab 10 a and the upper slab 10 b, and the space is filled with the shield 3 and the filler 7.

(Third embodiment)
Moreover, FIG. 3 shows one Embodiment of the shielding housing based on this invention using the wall 2 of the said 1st Embodiment, and the upper floor slab 10 of 2nd Embodiment, and similarly to FIG. 1 and FIG. The same components as those shown are denoted by the same reference numerals.
As shown in FIG. 3, a radiation generator 12 is installed in the chamber 1 in the shielding housing 11, and the wall 2 shown in the first embodiment is used as a wall and an upper floor slab covering the chamber 1. And the upper floor slab 10 shown in 2nd Embodiment is used.

  Here, the wall 2 is filled with the shield 3 between the inner wall 2a and the outer wall 2b of the portion corresponding to the wall surface from the floor to the ceiling of the chamber 1. Further, the upper floor slab 10 has a space formed between the lower slab 10a and the upper slab 10b in a portion covering the entire surface of the ceiling of the chamber 1, and the shield 3 and the filler 7 are formed in the space. Is filled.

  According to the wall 2, the upper floor slab 10, and the shielding housing 11 having the radiation shielding structure configured as described above, between the inner wall 2a and the outer wall 2b arranged at intervals and / or the lower slab 10a and the upper part. Between the slab 10b, the bag 4 is filled with the hydrous sand 5 and the opening 6 is sealed with the plurality of shields 3 and the filler 7, so that the water in the shield 3 A high radiation shielding effect can be obtained. In addition, since a part of the walls and the upper floor slab constituting the frame are replaced by earth and sand 5 containing water having a radiation shielding effect, the concrete necessary for constructing the wall 2 and the upper floor slab 10 is used. The amount can be reduced.

  In addition, according to the amount of radiation generated from the radiation generator 12 installed in the chamber 1, the interval between the inner wall 2a and the outer wall 2b and / or the interval between the lower slab 10a and the upper slab 10b is appropriately set, By adjusting the moisture content of the earth and sand 5 in the shield 3, it can be easily handled.

In addition, since the opening 3 of the bag 4 is hermetically sealed, the shield 3 does not change its moisture content, and therefore performs separate moisture content management, maintenance, and inspection as in the prior art described above. There is no need, and a high radiation shielding effect can be stably obtained over a long period of time.
In addition, construction at the time of building the building is easy, and the earth and sand 5 of the shielding body 3 is contained in the sealed bag 4 when the case is activated and needs to be disassembled. , Dismantling work and waste disposal can be performed easily.

  In the first embodiment, only the case where the wall 2 is configured by filling the plurality of shields 3 and the filler 7 between the inner wall 2a and the outer wall 2b has been described. For example, as shown in FIG. 4, the outer wall 16 made of reinforced concrete or steel plate having a height lower than that of the wall 15 is constructed on the outside of the wall 15 constituting the casing. A structure in which the space 15 and the outer wall 16 are filled with the shielding material 3 and the filler 7 and a curing material 17 that covers the shielding material 3 and the like is installed between the wall 15 and the outer wall 16 and the upper portion can also be adopted.

  According to such a shielding structure, when a radiation generator is newly installed in an existing building, or in place of the radiation generator installed inside, an apparatus with a larger amount of radiation is installed. In this case, it is possible to cope with the existing building by adding the shielding structure later.

The 1st Embodiment of the radiation shielding structure which concerns on this invention is shown, (a) is a longitudinal cross-sectional view, (b) is a front view of a shielding body. It is a longitudinal cross-sectional view which shows 2nd Embodiment of the shielding structure of the radiation which concerns on this invention. It is a longitudinal cross-sectional view which shows one Embodiment of the shielding housing which concerns on this invention. It is a longitudinal cross-sectional view which shows the modification of 1st Embodiment shown in FIG.

Explanation of symbols

1 room 2 wall 2a inner wall (inner plate)
2b Outer wall (outer plate)
3 Shield 4 Bag 5 Earth and sand 6 Opening 7 Filling material 10 Upper floor slab 10a Lower slab (inner plate)
10b Upper slab (outer plate)
11 Shielding body 12 Radiation generator

Claims (3)

A radiation shielding structure used as at least a part of a housing wall and an upper floor slab covering a chamber in which a device for generating radiation is installed,
An inner plate disposed on the chamber side, an outer plate disposed on the outer side of the inner plate, and a plurality of shields filled between the inner plate and the outer plate. And
A radiation shielding structure characterized in that the shielding body is filled with water-containing earth and sand in a watertight bag and the opening of the bag is sealed.   2. The radiation of claim 1, wherein a powdery or granular filler is densely filled between the plurality of shields filled between the inner plate and the outer plate. Shielding structure. A shielding housing covering a chamber in which a device for generating radiation is installed;
The shielding housing characterized in that the wall and the upper floor slab covering the chamber have the radiation shielding structure according to claim 1 or 2.

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