JP6972677B2 - Magnetic shield room - Google Patents

Description

The present invention relates to a magnetically shielded room used for various magnetic measurements.

The magnetic shield room of Patent Document 1 below has a wall structure in which a highly conductive material layer located on the outside and a magnetic material layer located on the inside are used as one unit layer, and three layers (multilayers) are used as the unit layer. Between the unit layer and the unit layer, a layer made of a material other than a highly conductive material or a magnetic material, such as an air layer or the like, is provided in order to enhance the electromagnetic shielding effect.

Japanese Patent No. 5104024

In recent years, an X-ray irradiation device may be used in a magnetically shielded room. In this case, in the conventional magnetic shield room structure, it is necessary to additionally provide an X-ray blocking wall on the outside or inside of the magnetic shield room in order to prevent external leakage of X-rays. Then, it was unavoidable to increase the external size of the magnetic shield room or reduce the internal space.

The present invention has been made in recognition of such a situation, and an object of the present invention is to provide a magnetically shielded room capable of suppressing external leakage of X-rays while suppressing an increase in external size and a reduction in internal space. ..

One aspect of the invention is a magnetically shielded room. This magnetically shielded room
Equipped with a shield body that forms a magnetically shielded interior space
At least a portion of said shield body has two magnetic shield layer comprising a magnetic material layer and the high conductivity material layer, and to have a X-ray blocking material layer between the two magnetic shield layers.

The X-ray blocking material layer may contain at least one of gypsum, barium, and lead.

The magnetically shielded room may be portable.

It should be noted that any combination of the above components and a conversion of the expression of the present invention between methods, systems and the like are also effective as aspects of the present invention.

According to the present invention, it is possible to provide a magnetically shielded room capable of suppressing external leakage of X-rays while suppressing an increase in external size and a reduction in internal space.

The perspective view of the magnetic shield room 1 which concerns on Embodiment 1 of this invention is seen from the front upper left direction. Similarly, a perspective view seen from the upper right direction of the front. Similarly, a perspective view seen from the upper left direction of the back. Similarly, a perspective view seen from the upper right direction on the back. The cross-sectional view which shows an example of the laminated structure of the shield body of a magnetic shield room 1. FIG. 2 is a cross-sectional view showing another example of the laminated structure of the shield body of the magnetic shield room 1.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. The same or equivalent components, members, etc. shown in the drawings are designated by the same reference numerals, and duplicate description thereof will be omitted as appropriate. Further, the embodiment is not limited to the invention but is an example, and all the features and combinations thereof described in the embodiment are not necessarily essential to the invention.

The magnetic shield room 1 according to the embodiment of the present invention will be described with reference to FIGS. 1 to 5. The magnetic shield room 1 has an upper shield body 11, a side peripheral shield body 12, a lower shield body 13, and a door 20 that opens and closes a side opening. The door 20 may be a single door, but in the present embodiment, it is a double door composed of a left door 21 and a right door 22, and is opened and closed at the left and right opening edges of the side peripheral shield body 12 by a hinge (not shown). Can be freely connected. At least one of the upper shield body 11, the side peripheral shield body 12, and the lower shield body 13 has a through hole 50 for passing a wiring connected to a measuring instrument (not shown), a power cord of ancillary equipment (not shown), and a cable. Is formed.

A pedestal 70 having a higher rigidity than the lower shield body 13 and having the same dimensions as the bottom surface of the lower shield body 13 is provided on the lower side (lower surface) of the lower shield body 13, and the lower shield body 13 is placed and fixed on the pedestal 70. NS. The pedestal 70 is made of, for example, stainless steel. At least three casters 75 as a means of transportation for moving on the floor surface are attached to the bottom surface of the pedestal 70. The magnetic shield room 1 is portable here, and is convenient when moving because the casters 75 are provided. At least one, preferably two or more of the casters 75 may be stoppered. The upper shield body 11, the side peripheral shield body 12, and the lower shield body 13 are preferably conductively connected to the pedestal 70 (electrically connected so as to have the same potential). The pedestal 70 may be a highly rigid and non-conductive non-magnetic material.

The upper shield body 11, the side peripheral shield body 12, the lower shield body 13, and the door 20 are magnetic shield bodies that can shield magnetic field noise and electromagnetic wave noise, and are X-ray shield bodies that can shield X-rays. 5 or a laminated panel having a layered structure shown in FIG. Hereinafter, the upper shield body 11, the side peripheral shield body 12, the lower shield body 13, and the door 20 are also simply referred to as “shield bodies”. 5 and 6 show a cross-sectional structure of a corner formed by shield bodies forming adjacent wall surfaces. FIG. 5 shows an example in which shield bodies forming adjacent wall surfaces are integrated, and FIG. 6 shows an example in which shield bodies forming adjacent wall surfaces are separate bodies (a corner portion is formed by a combination of a flat plate and a flat plate). Example) is shown. As shown in FIGS. 5 and 6, each shield has two magnetic shield layers composed of a magnetic material layer 61 and a high conductivity material layer 62, and X-ray shielding is performed between the two magnetic shield layers. It has a material layer 63.

The magnetic material layer 61 is, for example, a permalloy plate as a conductor and a magnetic material having a high magnetic permeability. The high conductivity material layer 62 is, for example, an aluminum plate as a conductor. The X-ray blocking material layer 63 is, for example, a plate containing at least one of gypsum, barium, and lead. The permalloy plate is effective in shielding magnetic field noise. The aluminum plate is effective in shielding high-frequency electromagnetic noise. Gypsum, barium, and lead are all effective in blocking X-rays.

A pipe-shaped through conductor (not shown) is provided on at least a part of the inner peripheral surface of the through hole 50. The magnetic material layer 61 and the high conductivity material layer 62 on the inner side of the magnetic shield room 1 and the magnetic material layer 61 and the high conductivity material layer 62 on the outer surface side are made conductive with each other by the pipe-shaped through conductor. It is set to electric potential. The material of the pipe-shaped through conductor is, for example, aluminum, copper, permalloy, or the like. In the upper shield body 11, the side peripheral shield body 12, and the lower shield body 13, it is preferable that the conductors of the magnetic shield bodies constituting them are electrically connected to each other.

According to this embodiment, the following effects can be obtained.

(1) Since it has two magnetic shield layers composed of a magnetic material layer 61 and a high conductivity material layer 62, and has an X-ray blocking material layer 63 between the two magnetic shield layers, X-ray leakage to the outside. It is not necessary to additionally provide an X-ray blocking wall on the outside or inside of the magnetic shield room 1 for prevention. Here, since the X-ray blocking material layer 63 is conventionally provided in a place where it is a non-highly conductive and non-magnetic layer such as an air layer or wood in order to enhance the magnetic shielding effect, the magnetic shield room 1 has an outer shape. It can suppress the external leakage of X-rays while suppressing the expansion of size and the reduction of internal space, and is suitable for the use of X-ray irradiation devices. In particular, since the magnetic shield room 1 is portable, it is required to be miniaturized and it is important to secure a large internal space that does not make the user feel narrow, so that it is possible to suppress the expansion of the external size and the reduction of the internal space. The significance of the effect is remarkable.

(2) Since one or a plurality of through holes 50 are provided in any one of the upper shield body 11, the side peripheral shield body 12, and the lower shield body 13, it is convenient for various wiring work. Further, a pipe-shaped through conductor (not shown) is provided on at least a part of the inner surface of the through hole 50, and the conductor plate (magnetic material layer 61 and high conductivity) of the upper shield body 11, the side peripheral shield body 12, or the lower shield body 13 is provided. By conducting the material layer 62), the leakage of electromagnetic noise from the through hole 50 can be reduced.

(3) The main body of the magnetic shield room 1 including the upper shield body 11, the side peripheral shield body 12, and the lower shield body 13 is placed and fixed on a highly rigid pedestal 70 to obtain the main body. The weight of the bottom surface of the portion is dispersed and stable, and the distortion of the magnetic shield room 1 during movement can be reduced.

(4) When the pedestal 70 is a conductor, the pedestal 70 is magnetically connected by electrically connecting the upper shield body 11, the side peripheral shield body 12, and the lower shield body 13 (that is, the main body of the magnetic shield room 1). It becomes easier to take the ground when the shield room 1 is installed. That is, the pedestal 70 may be connected to the external ground connection terminal.

Although the present invention has been described above by taking the embodiment as an example, it is understood by those skilled in the art that various modifications can be made to each component and each processing process of the embodiment within the scope of the claims. By the way. Hereinafter, a modification example will be touched upon.

It is preferable that the upper shield body 11, the side peripheral shield body 12, the lower shield body 13, and the door 20 all have an X-ray blocking material layer 63 on the entire surface, but one shield body has an X-ray blocking material layer. Even if only a part of the 63 is provided, it is possible to suppress the external leakage of X-rays as compared with the case where the X-ray blocking material layer 63 is not provided. If there is no pedestal 70 and casters 75 with stoppers and the lower shield body 13 is placed directly on a concrete surface, for example, the lower shield body 13 does not have the X-ray blocking material layer 63, but is outside the X-rays. There is almost no effect on leakage.

In the layer structure of each shield body, at least one of the magnetic shield layers may be laminated in the reverse order of the magnetic material layer 61 and the high conductivity material layer 62. For example, in the magnetic shield layer on the internal space side of the magnetic shield room 1 with respect to the X-ray blocking material layer 63, the high conductivity material layer 62 is on the internal space side, and the magnetic material layer 61 is on the X-ray blocking material layer 63 side. It may be laminated so as to be. A layer made of a highly conductive material, a magnetic material, or a material other than the X-ray blocking material, such as an air layer, a wood layer, or the like, may be provided between the X-ray blocking material layer 63 and at least one magnetic shielding layer. The magnetic shield layer may have three or more layers, and in this case, the X-ray shielding material layer 63 may have two or more layers. The magnetic shield layer does not have to have the high conductivity material layer 62.

The appearance of the magnetically shielded room of the present invention is not limited to the rectangular parallelepiped shape, and may be another shape such as a cylindrical shape. The door 20 is not limited to the rotary type, but may be a slide type, and may have a structure that can open and close the opening of the internal space.

1 Magnetic shield room, 11 Upper shield body, 12 Side peripheral shield body, 13 Lower shield body, 50 Through holes, 61 Magnetic material layer, 62 High conductivity material layer, 63 X-ray blocking material layer, 70 pedestal, 75 casters

Claims (3)

Equipped with a shield body that forms a magnetically shielded interior space
At least a portion of said shield body has two magnetic shield layer comprising a magnetic material layer and the high conductivity material layer, and has an X-ray blocking material layer between the two magnetic shield layers, magnetic shield Room. The magnetically shielded room according to claim 1 , wherein the X-ray blocking material layer contains at least one of gypsum, barium, and lead. The magnetically shielded room according to claim 1 or 2 , which is portable.

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