JPS63195596A - Radiation protective clothing - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is used to protect people who may be exposed to radiation, such as workers at nuclear power plants, doctors, nurses, and patients at hospitals, from radiation. Regarding radiation protection clothing used for.

[Prior art and problems] Flexible radiation shielding materials include those that use a thin lead sheet alone, those that use a lead sheet as the main material and a reinforcing plastic film such as polyethylene, or those that use lead-containing materials. BACKGROUND ART Lead-containing resin sheets such as rubber sheets or lead-containing polyvinyl chloride sheets are conventionally known, and radiation protective clothing using lead-containing resin sheets are also known.

Incidentally, lead-containing sheets have excellent elongation, flexibility, and elasticity, and fit to the body like a wet suit, making them excellent in movement and workability.

However, in order to obtain the necessary radiation shielding ability, it is necessary to incorporate a large amount of lead powder, which causes elongation, flexibility,
The fact that it has excellent elasticity is a disadvantage. That is,
When cut and sewn into the shape of a radiation protection suit, the entire weight is placed on the shoulders because it fits the body, making it feel heavier. Furthermore, it is constantly under load while being worn, and when used for a long period of time, it will stretch excessively due to its own weight and become thinner in some areas, reducing the radiation shielding ability of those areas.

On the other hand, lead foil or sheet has excellent radiation protection even if it is extremely thin because it is a continuous body of lead. Furthermore, there is no problem of elongation over time that was seen with lead-containing sheets. Note that if a lead sheet is used alone, folding will cause irreversible wrinkles, making it difficult to use repeatedly. To prevent wrinkles from forming, a plastic film such as polyethylene is pasted on one or both sides of the lead foil or sheet. Reinforcement has been proposed in documents such as Japanese Patent Laid-Open No. 59-218098.

The radiation shielding material disclosed in the above document (Japanese Unexamined Patent Publication No. 59-216096) has a good wrinkle prevention effect due to the reinforcing effect of the resin layer, and when used in a stationary state such as a protective mat. Demonstrates excellent handling and reversing usability.

By the way, radiation protective clothing is primarily intended to protect organs and genital tracts from radiation. Therefore, the radiation shielding material must be able to cover at least the body from the shoulders to above the knees. Furthermore, work while wearing radiation protection suits is not limited to standing work, but also includes work that requires bending forward, such as bending or sitting.

However, in such a posture of bending forward, unless the radiation shielding material is extremely flexible, such as the lead-containing sheet, it will not bend in line with the posture, making it uncomfortable to wear. In this case, a phenomenon occurs in which the front shielding material pushes upward.

It is an object of the present invention to provide radiation protective clothing that does not cause such a push-up phenomenon, has excellent workability and maneuverability, is light in weight, can withstand long-term use, and has excellent radiation shielding ability.

[Means for Solving the Problems] The radiation shielding material of the present invention comprises: (A) a shielding material for the upper body consisting of a lead foil and a base material layer laminated on at least one side of the lead foil; At least one radiation shielding material made of a sheet of inorganic powder material having a specific gravity is used as a radiation protection material.

[Function] The radiation protection suit of the present invention is provided with a radiation shielding material consisting of an upper body shielding material and a lower body shielding material as its radiation protective material.

According to the present invention, since the upper body shielding material is made by laminating a base material layer on lead foil, it has sufficient radiation shielding ability and is flexible enough to follow the movements of the upper body. . On the other hand, the shielding material for the lower body is made of a highly flexible resin sheet containing inorganic powder, so when sitting or bending forward, even if the body bends at an acute angle around the waist, it can easily follow the movements of the body. can do. As mentioned above, inorganic powder-containing sheets have the problem of elongation due to their own weight, but in the present invention, since the area used is small, elongation will not cause a decrease in mechanical strength or affect workability and behavior. do not have.

In addition, since lead foil is used in the upper body shielding material, the resin content (binder content) is lower than that of lead-containing resin sheets.
can be made lighter. If the shielding ability is the same, the lead foil forming the continuous layer is actually lighter even in terms of lead weight. Furthermore, upper body shielding materials made of lead foil have almost no elongation and do not have roving properties, so if such upper body shielding materials are used, they will be in an armor-like state with excellent flexibility. There is no case where the entire ff1ffi is applied only to the section. Therefore, the perceived weight can be reduced.

As described above, the radiation protection material used in the present invention is a shielding material that is lightweight, has excellent radiation shielding ability, and has appropriate flexibility, and is used to protect the upper body, and a shielding material containing inorganic powder that has particularly excellent flexibility is used to protect the lower body. Since a resin sheet is used, protective clothing using such protective materials not only has the required shielding ability, but also has excellent workability, maneuverability, and durability, and also reduces not only the perceived weight but also the actual weight. It is something that can be done.

[Embodiments] The radiation protection material used in the radiation protection suit of the present invention broadly includes three embodiments.

In the first embodiment, as shown in FIGS. 1 and 2, the upper body shielding material and the lower body shielding material are separately manufactured and joined at their respective ends.

In the second embodiment, as shown in Figures 4 and 5, the base material layer of the upper body shielding material is extended downward, and an inorganic powder-containing resin sheet is pasted to the extended part (hereinafter referred to as an apron). It is something that exists.

As shown in Figures 6 and 7, the third embodiment uses a resin sheet mixed with inorganic powder as the base material layer in the second embodiment, and in this embodiment, the apron directly constitutes the lower body shielding material. ing.

Next, each embodiment will be explained in more detail.

In the first embodiment, as shown in FIG. 1, at least one radiation shielding material (2) is used, which is formed by joining an upper body shielding material (3) and a lower body shielding material (4). .

FIG. 2 shows a schematic vertical cross-sectional view of the radiation shielding material (2). As shown in Figure 2, the upper body shielding material (3) is made of lead foil (5).
A lower body shielding material (4) consisting of a resin sheet containing a high specific gravity inorganic powder and a base material layer (6) laminated thereon.
) and are joined at their ends.

The joining position of both shielding materials (3) and (4) is between the lower end of the wearer's sternum and the upper end of the hip bone, so that the protective clothing does not push up when sitting or bending forward. preferable.

In particular, it is preferable to join within a range of approximately 2 cs above and below the scrap.

As for the joining method, both may be directly joined using an adhesive, or may be joined using an adhesive tape or the like. In addition, methods such as sewing using a sewing machine or using metal fittings as a base can also be used.

As the lead for the lead foil (5) used in the upper body shielding material (3), pure lead or alloy lead can be used. JIS for pure lead
Examples include 5FIi ingots specified in H2105 (1955) and 4 types to special lead ingots with higher purity than the 5FIi ingots. Preferably, one with a purity of 99.8% by weight or more is used. As the alloy lead, for example, Sn-Sb
system alloy (Sn5%, Sb 1.5%), Sn alloy (5n
lO%) etc. are used.

The thickness of the lead foil (5) is 20 to 300 μm, preferably 50 μm.
~200 μm, particularly preferably 75 to 150 μm. If it is thinner than 20 μI, it will not only be difficult to manufacture, but it will also be impossible to obtain the desired mechanical strength. Moreover, if the thickness is more than 300 μm, the flexibility and bending resistance will be poor.

Materials for the base layer laminated on the lead foil include materials that have flexibility or elasticity and materials that serve to increase mechanical strength. The former has a great effect of preventing wrinkles that tend to occur in lead foil, and the latter has a great effect of reinforcing lead foil, improving its durability, and preventing corrosion. Hereinafter, the former will be referred to as a flexible material, and the latter will be referred to as a reinforcing material.

Examples of flexible materials include flexible organic polymers such as polyethylene, soft polyvinyl chloride, urethane rubber, and vulcanized rubber, or foams thereof, polyester, nylon, polyethylene, polypropylene, cotton, hemp, rock wool, ceramics, Examples include fiber products such as woven fabrics, non-woven fabrics, mats, and blankets made of organic or inorganic fibers such as carbon, glass, and metal, and elastomer sheets described later.

In a particularly preferable flexible material, the formed base layer is
In the log-log graph of the Young's modulus-thickness relationship shown in the figure,
■(1) (0.01, to, 000), ■(1)(0
．． 04,11)(0.000),■(11)(0.8
00), 600), (4) (11) (0.20) ■(
5) (2, 20), and ■ (1) (0.01, 300
) (Note: Among the numbers in parentheses at each point, the first number indicates the value of Young's modulus kg/mm2, and the second number indicates the thickness μm. The same applies below.) The Young's modulus value and layer thickness are within the range given below. In the present invention, Young's modulus is the modulus at 1% elongation (kg/mu2) when measured according to the tangential modulus method described in the 3rd line from the bottom of the right column on page 285 of the Polymer Materials Handbook, edited by The Society of Polymer Science. shall be.

A base material layer that satisfies the above conditions has a high effect of preventing wrinkles from forming on the lead foil and, even if wrinkles do occur, has a high effect of smoothing out wrinkles due to its excellent elasticity.

A particularly preferable base layer is (1) (0.05,3,00
0), ■(5) (2,600), ■(5) (2,30)
and within the area surrounded by each point of [phase] (1) (0.05,200), and furthermore ■ (1) (0.!, 1.500)
, @(15,500), @(1,5,50) and ■(
1) It falls within the area surrounded by each point (0.1,200).

Materials that satisfy the above Young's modulus value include elastomers, such as rubber or its vulcanizates, thermoplastic elastomers, plasticized plastics, and ethylene copolymer elastomers (hereinafter, these materials are simply referred to as elastomers). ), etc.

Examples of the above rubbers include natural rubber, styrene-butadiene rubber, styrene-isoprene rubber, styrene-ethylene rubber, styrene-butylene rubber, urethane rubber, ethylene-propylene rubber, ethylene-propylene-diene rubber, and butyl rubber.

Examples of thermoplastic elastomers include thermoplastic urethane,
Examples include thermoplastic polyester, styrene thermoplastic elastomer, and olefin thermoplastic elastomer.

Examples of plasticized plastics include polyvinyl chloride plasticized with a plasticizer and internally plasticized polyvinyl chloride. Examples of the ethylene copolymer elastomer include ethylene-vinyl acetate copolymer elastomer and ethylene-ethyl acrylate elastomer.

Ru.

In addition, vulcanized urethane rubber (1) (0.6,200), vulcanized natural rubber (1) (0.3,200), vulcanized natural rubber (
1) (0.5) (2,500), vulcanized butyl rubber (1)
(0.15,700), vulcanized styrene-butadiene rubber (1) (0.3,500), thermoplastic polyester (1
) (0.9,200), thermoplastic polyurethane (1)
(0.55,400), Styrenic thermoplastic elastomer (1) (0.+8.500), Styrenic thermoplastic elastomer (1) (0.27,300), Olefinic thermoplastic elastomer (1) (0 .4,300), olefinic thermoplastic engineered lastomer (1) (0.5,250
), olefinic thermoplastic elastomer (1,1,80
0), ethylene-vinyl acetate copolymer elastomer (101) (
0.200) and ethylene-ethyl acrylate copolymer elastic body (3,1) (0.300), with a thickness of 100
A protective material made of pure lead foil (purity: 99.95% by weight) bonded together with a urethane adhesive had an excellent effect of preventing wrinkle formation.

The above elastomer may be a mixture of high specific gravity inorganic powder such as lead or a compound thereof.

The reinforcing material is preferably a polymer with good film-forming properties, such as polyolefin, polyethylene, ethylene-ethyl acrylate copolymer, ethylene-ethyl acrylate copolymer, etc.
Propylene copolymer, ethylene-vinyl acetate copolymer,
Examples include polyolefins such as ethylene-butene-1 copolymer, polyesters such as polyethylene terephthalate, polystyrene, polyvinyl chloride, and synthetic or natural rubber. Among them, polyethylene has a high effect of shielding neutrons, so it is particularly preferable when used for shielding an environment where neutrons exist.

One or more base material layers are provided on one or both sides of the lead foil using the above two types of materials alone or in combination. When provided on both sides, the same or different materials may be used. When the base material layer is formed of a flexible material, its thickness is generally 10 to 51) (about 0.000.czm, preferably 20 to 20.000 um s, particularly preferably 4
0 to 1,000 μl. If the lead foil is thinner than 10 μm, it will be difficult to prevent the lead foil from forming severe creases when folded, and if it is thicker than 50,000 μm, the lead foil will become unnecessarily bulky, so both are not preferred. The tensile strength of the base material layer itself is, for example, 0.05 kg/+am
2 or more, preferably 0.1 kg/mm2 or more, especially 0
．． 15 kg/am2 or more is preferable.

Formation of the flexible base material layer can be performed by various methods. For example, a method is employed in which the material is formed into a sheet and then adhered or adhered to lead foil.

The reinforcing base material layer not only improves the mechanical strength and durability of the lead foil, but also serves to prevent corrosion of the lead sheet.

Therefore, as long as these effects can be achieved, it is not limited to a specific organic substance, and two or more types can be used, or a multilayer structure with two or more layers may be used, depending on the environment to be shielded as described above. A material that is resistant to these conditions is appropriately selected.

The thickness of the reinforcing base material layer varies depending on the physical properties of the organic substance used, the thickness of the lead foil, and the purpose, but usually the thickness on one side is 10 to 3.
00 μm1, preferably 20 to 200 μm1, particularly preferably 20 to 100 μm.

Thinner than 10 μm generally has low mechanical strength and is difficult to apply, while thicker than 300 μl is bulky and undesirable. The tensile strength of the reinforcing base material layer itself is, for example, 0.3 kg/a+m2 or more, preferably 0.5
kg/mm2 or more, especially 0.8 kg/11m2 or more is preferable.

Formation of the reinforcing base material layer (8) can be performed by various methods. For example, a film or sheet of the above-mentioned organic material may be pasted or adhered, an organic material in the form of a solution or emulsion may be applied, or an organic material heated and melted may be coated. A method may also be used in which a precursor of the organic substance is applied by a method such as coating and then cured.

The adhesive strength between the lead sheet (S) and the reinforcing base material layer (8) does not need to be so strong, for example, the peel strength is 0.3 kg/
inch (ASTM D 1878) or more is sufficient.

FIG. 3a shows a schematic sectional view of another embodiment of the upper body shielding material (3).

In FIG. 3a, (7) is a skin layer formed on the surface of the flexible base material layer (6), and when the flexible base material layer (6) is made of a thermoplastic organic polymer, only the skin layer is formed on the surface of the flexible base material layer (6). It is formed by heating and melting it on a hot plate, or by pasting a thin film.

This skin layer (7) is thin, on the order of several microns to several tens of microns, and has the effect of sufficiently protecting the flexible base material layer (6).

In addition, as shown in Figure 3b, a flexible base material layer (6) is formed on the lead foil.
A reinforcing base material layer (8) may also be provided. Reinforcement base material layer (8)
The lead foil may be laminated on one side or both sides.

When laminated on one side, it may be on the side on which the flexible base material layer (6) is laminated or on the opposite side.

If the lead foil is laminated on the opposite surface, the lead foil will not come into direct contact with the atmosphere, and the corrosion prevention effect will be enhanced.

Further, only the reinforcing base material layer may be employed as the base material layer.

The lower body shielding material (4) is formed of an organic polymer compound sheet containing high specific gravity inorganic powder. As the inorganic powder, various lead oxides (for example, Pb2O, pbo, PbO2, Pb2O3, etc.) and iron powder having a specific gravity of 5 or more, particularly 6 or more are preferable, and among these, PbO is particularly preferable. Lead powder can also be used, but its dispersibility is poor and it is difficult to form a uniform lead powder layer.

The particle size is 100 mm or less, preferably 1 to 80 mm. Cl1m5
Particularly preferred is one having an average particle size of 5 to 50 square meters. If the particle size is too large, it will be difficult to form a sheet with a smooth surface; if the particle size is too small, secondary agglomeration will occur and it will be difficult to disperse.
.

Examples of organic polymer compounds include various rubbers (e.g., natural rubber, butyl rubber, ethylene-vinyl acetate rubber, urethane rubber, etc.), thermoplastic elastomers (e.g., thermoplastic polyester, etc.), and plasticized polyvinyl chloride. The material is not limited to the above materials as long as the formed sheet is flexible. The hardness of the sheet is Shore hardness 2.
0 to 90, preferably 25 to 80, particularly 30 to 70. It is preferable to use the rubber after vulcanization.

Other materials may be vulcanized if desired.

The total thickness of the lower body shielding material is 500 to io, ooo, n.

Preferably it is 800 to 8.000 AIm, particularly preferably 1.000 to 5.000 ρ. The total button equivalent of the inorganic powder is 0.1 to 2.0, preferably 0.15 to 1.
．． 0, particularly preferably 0.2 to 0.8. The thickness per sheet is 0.1-1.5mm, preferably 0.1-1.5mm.
2-1, Oa+m.

Next, a second aspect of the radiation protection material will be explained based on FIGS. 4 and 5.

This second embodiment is characterized in that the base layer M of the upper body shielding material (3) extends downward beyond the lower end of the lead foil (5). By providing the extension (apron) in this manner, the lower body shielding material (4) can be easily formed by laminating the inorganic powder-containing sheet Of) to the extension.

Note that the structure of the upper body shielding material (3) may be one of the various structures described in the first embodiment.

The third aspect will be explained according to FIGS. 6 and 7.

The feature of the third embodiment is that an inorganic powder-containing sheet 02) is used as the base layer of the upper body shielding material (3). Therefore, the extension of the base layer directly forms the lower body shielding material (4). In addition, the inorganic powder-containing sheet 02) has the same drawbacks as conventional lead-containing sheets, but in this embodiment, lead foil (5) is laminated on the upper body shielding material, making it possible to prevent stretching. Become. Furthermore, when a reinforcing base material layer is provided on the other side of the lead foil, the mechanical strength is further improved. In addition, since lead foil has a large radiation shielding ability, the thickness and weight of the inorganic powder-containing sheet can be reduced, and the armor effect of lead foil can also be obtained, significantly reducing the perceived weight. can.

Further, as in the second embodiment, an inorganic powder-containing sheet may be further attached to the extension portion.

The radiation protective clothing of the present invention includes the above-mentioned radiation protective material in the protective clothing (
For example, it is produced by cutting it into an apron-type shape as shown in FIG.

The number of protective materials to be used varies depending on factors such as the thickness of the lead foil and the lead content of the lead-containing sheet, the amount of radiation to be shielded, comfort, and ease of production. ~
Use 8 sheets stacked.

When using a plurality of sheets in a stack, it is preferable to provide a sliding means at least between the lower body shielding materials, that is, the inorganic powder-containing sheets.

As the sliding means, any material, method, or means can be used as long as it improves the sliding between the sheets containing at least the inorganic powder, and the material may be solid, liquid, or gas. No question. However, it is preferable to use a material that does not take up much space and can maintain slipping performance over a long period of time. There is a method of attaching inorganic powders such as molybdenum sulfide, silica, graphite, and talc to the surface. The slip powder preferably has an average particle size of 100. Hereinafter, fine powder of 50 mm or less, particularly spherical or nearly spherical, is preferred.

In addition to the above-mentioned sliding powder, there are also sliding materials such as polytetrafluoroethylene sheets with low friction coefficients, especially films or sheets with a static friction coefficient of 1) (0.2 or less, and even 0.1 or less), silk, etc. Methods include inserting a slippery woven fabric, non-woven fabric, or paper, and enclosing a gas such as nitrogen gas into the protective clothing.

The radiation protection suit of the present invention is manufactured using at least one cut protective material, but the protective material may be worn as is, or the protective material may be made of cloth (9) or the like as shown in FIG. It may be made by covering. In terms of comfort, appearance, hygiene, and durability, it is preferable to use cloth.

Fabrics (9) (however, not necessarily required for the present invention) include, for example, woven fabrics, nonwoven fabrics, and film sheets made of natural fibers, polyester, and synthetic resins such as nylon, or polyethylene or polyester on one or both sides thereof. Those whose surface has been treated with vinyl chloride, polyvinyl acetate, ethylene-vinyl acetate copolymer, elastomer, etc. are used.

Next, various embodiments and shapes of the radiation protection suit of the present invention will be explained with reference to the drawings, but the present invention is not limited to such embodiments.

Figures 8a-80 show front, back and side views, respectively, of one embodiment of a radiation protective suit. This embodiment:
It is a string type that has been approved under the Pharmaceutical Affairs Law (approval number (61B) No. 720).

Protective clothing (■) is worn on the torso (in this invention, the torso is defined as the front part between the collarbone and the lowest part of the genitals).
It has an upper body part (21) that covers the part above the waist, a lower body part that covers the part below the waist, a back part that covers the shoulder flap part of the back, and a side part (24) that covers the side part of the torso. , cord (to)
It is designed to be worn by tying it around the middle between the upper body part (21) and the lower body part. The outer fabric of such protective clothing (1) is made by sewing, fusing, welding, gluing, pasting, or the like. In addition, the outer fabric is made into a bag by sewing, fusing, welding, gluing, pasting, etc. the front and back materials at the side edges, and the radiation protection material (2) is placed inside the outer fabric. It will be done. The protective material (2) is required to have a shape and size that can at least cover the torso when worn, but the protective material (2) having the structure shown in the first to third aspects is used. As the wearer moves freely or bends at the waist, it quickly follows the wearer's body movements and is sufficiently shielded from radiation.

In the example shown in Fig. 8, the protective material (2) is encapsulated in the fabric (9), but as mentioned above, the fabric (9) is not necessarily necessary, and the protective material (9) alone can be used to protect the entire protective clothing. At least the body part may be constructed.In that case, in order to improve the aesthetics or appearance, the outer surface of the protective material (2) may be printed or a decorative outer cover, such as patterned fabric, may be applied with adhesive. In addition to the shape shown in FIG. 8, the protective clothing of the present invention may also be of a poncho type, gown type, coat type, armor type, or other shapes.

Figures 9a-9b, 10a-10b, 11a-l
Figures lb and 12a-12b show front and rear views of alternative embodiments, respectively.

The embodiment shown in FIG. 9 uses a belt ■ instead of a string,
It is of the type that is tightened with a buckle (31). A fastener (33) such as Velcro is provided on the back (32).

The embodiment shown in FIG. 1O is a version of the belt of the type shown in FIG.

The embodiment shown in FIG. 11 has a larger back portion (32);
It is designed to cover the back of the upper body widely up to the waist. The fixing is done with Velcro or the like at the overlapping part of the back (32).

The embodiment shown in FIG. 12 is of the type shown in FIG. 11, with a cover (34) provided to protect the back of the lower body. The cover (34) may be prefixed to the back (32), but it is advantageous to make it removable so that it can be attached when required. The attachment/detachment means may be Velcro, snap buttons, etc. Moreover, the cover (84) can also be applied to the embodiments shown in FIGS. 8 to 10.

Next, the radiation protection suit of the present invention will be explained based on Examples, but the present invention is not limited to these Examples.

Examples 1 to 10 and Comparative Examples 1 to 4 Radiation protective clothing of the type of example shown in FIG.
It was manufactured with the dimensions shown in the figure. The radiation shielding materials used as examples of the present invention are shown in Fig. 15 (A type) and Fig. 16 (
Type B).

The materials used are shown in Table 1.

[Basic specifications of A type (Fig. 15) (Shielding material for upper body) Lead foil: 99.9% purity, 100 times thick Base material layer: 1st base material layer aυ on one side, 2nd base material on the other side Layer surface (shielding material for lower body) Organic polymer compound sheet l'3° containing PbO powder (joining method) Joined with adhesive tape.

[Basic specifications of B type (Figure 18)] (Shielding material for upper body) Lead foil: Purity 99.9%, thickness 1100a Base layer: First base layer Oe on one side, second layer containing inorganic powder on the other side Base material layer (shielding material for lower body) Organic polymer compound sheet 6° containing PbO powder (joining method) Organic polymer compound sheet 4 was joined to the second base material layer 02) with adhesive tape 04).

In addition, there are 4 shielding materials for type A and 2 shielding materials for type B.
It was used in layers.

As comparative examples, the entire shielding material shown in Table 1 was prepared using four sheets having the same structure as the upper body shielding material (Comparative Example 1), and the sheet was prepared using four lead-containing sheets shown in Table 1 (Comparative Examples 2 to 3). 4) is also shown.

The following items were investigated for the protective clothing of Examples 1 to 10 and Comparative Examples 1 to 4. The results are shown in Table 2.

(Total weight) Same lead equivalent (JIS Z 480: N,: specified 0,
35Pb) were weighed on a platform scale.

(Flexibility of clothes) The top and bottom of the clothes were each folded 1/4 way, and then folded again in the middle. This folded piece has a width of about 25 cm and a length of about 60 cIl. This was cut into a horizontal bar with a diameter of 25 cm so that the longitudinal direction was bent, and the distance between the bent ends (Ω
) was measured. Figure 17 shows the hung state.

(Feeling Weight) A monitor test was conducted with doctors and X-ray technicians (210 people). First, as a standard, the protective clothing of Comparative Example 4 was worn continuously for 3 hours, and then Examples 1 to 10 and Comparative Examples 1 to 3 were allotted to each monitor in several pieces. The evaluation is -1 if it is heavy compared to the standard (comparative example 4),
No change was set as 0, light weight was set as +1, and the ratio (%) was calculated by dividing the total score of winter clothes by the total number of people wearing it.

(Workability) A test was conducted using the same method as the perceived weight test on the same 210 monitors. The evaluation was made on the basis of movement, with -1 being difficult, 0 being unchanged, and +1 being easy to move, and expressed as a percentage (%) in the same way as for the perceived weight.

(Long-term usability) One end of a test piece with a width of 10a + m and a length of 1000IIIalSlin and a grain position of 400+μm from the top was fixed and hung, a 150 g weight was attached to the lower end, and the specimen was left at 50'C for 3 months. , the elongation was measured.

[Margins below] Table 2 [Effects of the Invention] When using the radiation protection suit of the present invention, it is lightweight in both actual weight and perceived weight, has excellent workability, maneuverability, and durability, and has sufficient radiation protection. Shielding ability can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view of an embodiment of the radiation protection suit of the present invention, FIG. 2 is a schematic vertical sectional view of the radiation protection material used in the present invention, and FIGS. 3a to 3b are for the upper body used in the present invention. 4 and 5 are respectively a schematic perspective view and a schematic sectional view of another embodiment of the present invention, and FIGS. 6 and 7 are respectively a schematic cross-sectional view of another embodiment of the present invention. a schematic perspective view and a schematic cross-sectional view of another embodiment;
Figures 8a to 80 are front, rear, and side views of another embodiment of the protective clothing of the present invention, and Figures 9a to 9b, respectively.
Figures 10a to 10b are front and rear views of still another embodiment of the protective clothing of the present invention, respectively;
Figures 1a to llb are front and rear views of still another embodiment of the protective clothing of the present invention, respectively, and Figures 12a to 12b are front and rear views of still another embodiment of the protective clothing of the present invention, respectively. Figure 13 shows the young layer for the base material layer.
A graph showing the relationship between thickness. Figure 14 is an explanatory diagram of the protective clothing used in the example. Figures 15 and 16 are schematic cross-sectional views of the shielding material used in the example. Figure 17 is a diagram showing the flexibility of the protective clothing used in the example. It is an explanatory view showing a state when measuring. (Main symbols in the drawing) (1), ■: Radiation protection suit (2): Radiation protection material (3) Two upper body shielding materials (4): Lower body shielding material (5): Lead sheet (6) Two base materials Layer patent applicant Mitsubishi Cable Industries Co., Ltd. Figure 1: Radiation protective suit 2Ea view, 3 Year 3b view Figure 5 A760 Off view Figure 8a Figure O8b Figure 29a Circle Offshore view 9b

Claims (1)

[Scope of Claims] 1. (A) A shielding material for the upper body consisting of lead foil and a base material layer laminated on at least one side of the lead foil, and (B) A shielding material for the lower body consisting of a resin sheet containing high specific gravity inorganic powder. A radiation protective suit comprising at least one radiation shielding material composed of a shielding material and a radiation shielding material. 2. The protective clothing according to claim 1, wherein the lower end of the upper body shield and the upper end of the lower body shield are joined together. 3. The protective clothing according to claim 1, wherein the base layer of the upper body shield extends beyond the lower end of the upper body shield. 4. The protective clothing according to claim 3, wherein a resin sheet containing inorganic powder as a lower body shielding material is laminated to an extension of the base layer. 5. The protective clothing according to claim 3, wherein the base material layer contains inorganic powder with high specific gravity, and the extension portion constitutes a lower body shielding material. 6. The protective clothing according to claim 1, wherein the lead foil is made of pure lead with a purity of 99.8% by weight or more. 7. The protective clothing according to claim 1, wherein the base layer is made of an organic polymer compound with a thickness of 10 to 50,000 μm. 8. The protective clothing according to claim 2, wherein the organic polymer compound is a mixture of high specific gravity inorganic powder. 9 The base material layer has (1) (0.01, 10,000), (2) in a logarithmic graph of Young's modulus-thickness relationship.
(0.04, 10,000), (3) (10, 600)
, (4) (10, 20), (5) (2, 20), and (6) (0.01, 300) (However, the first value in parentheses at each point is Young's modulus kg/mm^ 2. The protective clothing according to claim 1, wherein the protective clothing has a Young's modulus value and thickness within a region surrounded by each point (the latter value indicates a layer thickness μm). 10. The protective clothing according to claim 1, wherein the base material layer is made of a flexible organic polymer foam. 11. The protective clothing according to claim 1, wherein the base material layer is made of a woven fabric, non-woven fabric, mat, or blanket of organic or inorganic fibers. 12. The protective clothing according to claim 1, wherein two or more of the radiation protection materials are stacked. 13. The protective clothing according to claim 12, wherein a sliding means is provided between at least the lower body shielding material.