JPS62280698A - Stack for shielding radiation and radiation protective clothing using said stack - 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 3. Detailed Description of the Invention [Field of Industrial Application] The present invention provides a flexible radiation shielding material suitable for use as a component of radiation protection clothing, as well as a material for workers in nuclear power plants,
It relates to protective clothing used to protect doctors, nurses, patients, etc. from radiation in hospitals.

[Prior art] 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 a lead-containing rubber sheet or Own ship's own polyvinyl chloride sheets have been known for a long time, and radiation protection suits made of lead-containing rubber sheets and own ship's polyvinyl chloride sheets are also known.

By the way, the above-mentioned lead-containing sheet essentially has a limited radiation protection property because it is impossible to form a dense continuous film of lead powder even if a large amount of lead powder is mixed with it, and even a small amount of radiation protection is impossible. Since a large amount of lead powder is usually mixed in to improve protection, it has the disadvantage of extremely high ff1ffi.

However, as this lead-containing sheet has excellent flexibility, it is used as a constituent material for protective clothing as mentioned above, but the shortcomings of this sheet are reflected in protective clothing as well, with low radiation protection and high weight. It has its drawbacks. There is also the problem that the radiation shielding effect decreases due to its own weight, which causes it to elongate over time and reduce its thickness.

On the other hand, a lead sheet is a continuous body of lead, so even though it is extremely thin, in other words, it is extremely lightweight and still has excellent radiation protection properties. Furthermore, there is no problem of elongation over time that was seen with lead-containing sheets. Note that if the lead sheet is used alone, it will cause irreparable wrinkles when bent, making it difficult to use repeatedly. Therefore, to prevent wrinkles from occurring, the lead sheet should be reinforced by pasting a plastic film such as polyethylene on one or both sides. is published in Japanese Unexamined Patent Publication No. 59-21
This method has been proposed in documents such as Publication No. 0098.

[Problems to be Solved by the Invention] The radiation shielding material disclosed in the above-mentioned document (Japanese Unexamined Patent Publication No. 59-216098) has a good wrinkle prevention effect due to the reinforcing effect of the plastic layer, and is suitable for use as a protective mat. When used in a stationary state, it exhibits excellent handling and repeated use.

However, when this material is used as a component of protective clothing, it still has a poor wrinkle prevention effect, and protective clothing with a large number of wrinkles has a stiff feel and has a very poor appearance.

To explain the reason why wrinkles tend to occur, unlike protective mats, when wearing protective clothing, wrinkles always appear in all directions, at one moment very lightly, and at another moment extremely strongly. constantly bent. Therefore, it is necessary to prevent wrinkles from forming even after such repeated bending, but the plastic reinforcing layer of the prior art has poor resilience after bending, so the wrinkles that occur in the lead sheet can be quickly and sufficiently removed. It has a poor restoring effect and is therefore prone to wrinkles.

In view of the above circumstances, the present invention provides a radiation shielding material using a lead sheet that utilizes the above-mentioned advantages of the lead sheet and further improves wrinkle prevention properties, as well as a radiation shielding material that is comfortable to wear and has improved stiffness. The purpose is to provide protective clothing.

[Means for Solving the Problems] The present invention comprises stacking at least two shielding materials each consisting of a lead sheet and a flexible or elastic base material layer laminated on at least one side of the lead sheet, and The present invention relates to a radiation shielding system having a structure in which a sliding means is provided between adjacent shielding materials.

Further, in the present invention, the clothing component that covers at least the torso of a human body includes at least two shielding materials made of a lead sheet and a base material layer laminated on at least one side of the lead sheet and having flexibility or elasticity.

The present invention relates to a radiation protection suit having a configuration consisting of radiation shielding stacks that are stacked and provided with sliding means between adjacent shielding materials.

[Function] In the radiation shielding stack of the present invention, the shielding materials are stacked using sliding means, so when deformed by an external force, adjacent shielding materials slide against each other. Unforced deformation or local deformation is less likely to occur, and force can be naturally released. Moreover, since the shielding material of the present invention has a lead sheet and a base material layer having flexibility or elasticity, wrinkles with sharp edges are unlikely to occur, and even if such wrinkles occur, the base material layer Due to its elasticity, it works to smooth out wrinkles in a short time.

Further, since each shielding material is hard to wrinkle and each shielding material is easy to slide against each other, the stack of the present invention has extremely good flexibility and pliability as a whole.

Furthermore, the radiation protection suit of the present invention is comfortable to wear because it is made of the stack of the above-mentioned specific invention, which is resistant to wrinkles and has excellent flexibility. Furthermore, whether it is a stack or a protective suit, since it has a continuous lead sheet, it has excellent radiation protection, is much lighter than conventional products, and has a long service life.

[Example] Next, the present invention will be explained in detail.

FIG. 1 is a partial cross-sectional view of a stack according to one embodiment of the present invention, FIG. 2 is a partial cross-sectional view of a stack according to another embodiment of the present invention, and FIG. 3 is a partial cross-sectional view of a stack according to another embodiment of the present invention. FIGS. 4a to 40 are front views, rear views 1 and side views of one embodiment of the radiation protective clothing of the present invention, and FIGS. 5a to 5b are front views of the protective clothing of Example 22. Figures and (A)-(^) line sectional views, Figures 6a-6b are front views and (B)-(13) line sectional views of the protective clothing of Example 23, and Figures 7a-7b are of Example 24. The front view and (C)-(C) line sectional view of the protective clothing, Figures 8a-8b are the front view and (D)-(D) line sectional view of the protective clothing of Example 25, and Figures 9a-9b are Example 2
Figures 10a-IQb are a front view and a partial sectional view taken along the line (IE)-(E) of the protective clothing of Example 27, and a partial sectional view taken along the line (P)-(F) of Example 27. The figure is a front view of the protective suit of Example 28, and Figures 12a to 12b are Example 2.
13a = 13e are partial sectional views of the shielding material in Example 32, and FIG. 14 is the Young's modulus-thickness of the base material layer. It is a relationship graph.

The present invention will be explained in detail based on FIGS. 1 and 2. 00) is a shielding material, and at least two or more shielding materials M are stacked to form a stack (ioo). In the example in Figure 1, there are three shielding materials (T), and in the example in Figure 2, there are three shielding materials (T).
(goods) consists of 4 pieces, but of course there can be more than that, and if necessary, you can use 5 or more pieces, or even 10 pieces.
Faffl is used in several to several tens of sheets.

As shown in FIG. 3, the shielding material η has a structure including a lead sheet (1) and a flexible or elastic base material layer (2) laminated on at least one side of the lead sheet (1). ).

As the lead for the lead sheet (1), pure lead or alloy lead can be used. For pure lead, JI8 112105 (1955
), and 4W1 to special lead metals with higher purity than the above metals can be exemplified. Preferably, one with a purity of 99.8% by weight or more is used. Examples of lead alloys include 5n-Sb alloys (Sn5%, Sb1.
5%), Sn alloy (5nlO%), etc. are used.

The thickness of the lead sheet (1) is 20 to 300 μm, preferably 50 to 200 μm, particularly preferably 75 to 150 μm.
Maro is hired. If the thickness is less than 20μ, it is not only difficult to manufacture, but also the desired mechanical strength cannot be achieved. Moreover, if the thickness is more than 300 μm, the flexibility and bending resistance will be poor.

The lead sheet (1) also includes a reinforcing layer (3) laminated thereon. The reinforcing layer (3) may be laminated on one or both sides of the lead sheet (1). When laminated on one side, it may be on the side on which the base material layer (2) is laminated or on the opposite side. When laminated on the opposite surface, the lead sheet (1) does not come into direct contact with the atmosphere.

The reinforcing layer not only improves the mechanical strength and durability of the lead sheet (1) but also serves to prevent corrosion of the lead sheet (1).

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 layer (3) varies depending on the physical properties of the organic substance used, the thickness of the lead sheet (1), and the purpose, but usually the thickness on one side is 10 to 300 μl, preferably 20 to 200 μm,
Particularly preferably 20 to 100 μ-. Thinner than 10 μm generally has low mechanical strength and is difficult to apply, while thicker than 300 μm is undesirable as it becomes expensive. The tensile strength of the reinforcing layer (3) itself is, for example, 0.3 kg/ms+2 or more, preferably 0.5 kg/1
2 or more, particularly preferably 0.8 kg/am2 or more.

The organic substance is preferably a polymer with good film-forming properties, such as a radiation-resistant polymer that does not contain halogen and has a low tertiary carbon content, such as polyethylene, ethylene-ethyl acrylate copolymer, ethylene-ethyl acrylate copolymer, etc. Examples include propylene copolymer, ethylene-vinyl acetate copolymer, ethylene-butene-1 copolymer, and polyester such as polyethylene terephthalate or polystyrene. Among them, polyethylene has a high effect of shielding neutrons, so it is particularly preferable when used for shielding an environment where neutrons exist.

The reinforcing layer (3) can be formed 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 sheet (1) and the reinforcing layer (3) does not need to be very strong, for example, it is sufficient that the peel strength is 0.3 kg/inch (ASTM D 1g7B) or more.

The base material layer (2) laminated on the lead sheet (1) is preferably a material that has radiation resistance and has flexibility or elasticity. Examples of such materials include, in particular, flexible organic polymer foams such as polyethylene, flexible polyvinyl chloride, urethane rubber, and vulcanized rubber, polyester, nylon, polyethylene, polypropylene, cotton, linen, and rock wool. , fiber products such as woven fabrics, non-woven fabrics, mats, blankets, etc. made of organic or inorganic fibers such as ceramic, carbon, glass, metal, etc., or elastomer sheets described later. Base material layer (
The thickness of 2) is generally 10-51) (0.000.c+
m, preferably 20 to 21) (0.000 μm1, particularly preferably 4G-1,000 μm).

If it is thinner than 10μm, it will become a lead sheet (1) when bent.
It becomes difficult to prevent the formation of severe creases, and 51) (if it is thicker than 0.000μ, it becomes unnecessarily sublime, which is not preferable.The tensile strength of the base material layer (2) itself is, for example, 0.00μ). 05 kg/lll112
or more, preferably O, 1kg/12 or more, especially 0.1
5 kg/aha2 or more is preferable.

In the present invention, the base material layer (2 is preferably the 14th layer)
In the log-log graph of the Young's modulus-thickness relationship shown in the figure,
■(1)(0.01S11)(0.000) ,■(1
)(0..

4.11)(0.000) ,■(11)(0.600
> , ■ (10, 20) ■ (5) (2, 20), and ■ (1) (0.01, 300) (Note: The first value in parentheses at each point above is Young's modulus kg/ The value of mm2 and the subsequent numerical values each indicate the thickness distribution. The same applies below. In the present invention, Young's modulus is the modulus at 1% elongation (kg/■2
).

The base material layer (2) that satisfies the above conditions has a high effect of preventing wrinkles from forming on the lead sheet (1) and, even if wrinkles occur, has a high effect of smoothing out wrinkles due to its excellent elasticity.

A particularly preferable base layer (2) is (1) (0.05,3
,000),■(5)(2,600),■(5)(2,
30) and ■(1) (0.05,200), as well as ■(1)(0.l, 1.500
), @(15,500), @(1,5,50) and ■
(1) It falls within the area surrounded by the points (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.

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

The base material layer (2) can be formed by various methods. For example, a method may be employed in which the material is formed into a sheet and then adhered or adhered to the lead sheet (1).

Note that (2a) is a skin layer formed on the surface of the base layer (2), and when the base layer (a) is made of a thermoplastic polymer, only the surface thereof is heated with a hot plate. It is formed by melting or by pasting a thin film.

This skin layer (2a) is thin, on the order of several microns to several tens of microns, and has the effect of sufficiently protecting the base material layer (2).

The fabric 01) (but not necessarily required for the present invention) is required to be a radiation-resistant fabric, as it is often used as the outer fabric or lining fabric of protective clothing.For example, it is required to be a radiation-resistant fabric. Woven fabrics, non-woven fabrics, and film sheets made of synthetic resins such as polyester and nylon; woven fabrics and non-woven fabrics made of metal fibers, glass fibers, and asbestos fibers; and polyethylene, polyvinyl chloride, and polyvinyl acetate on one or both sides. , those whose surface has been treated with ethylene-vinyl acetate copolymer, elastomer, etc. are used.

The sliding means is provided at least between adjacent shielding materials (K). When the fabric 011 is used, it is preferable to further provide a sliding means between the shielding material (goods) and the fabric 01). As the sliding means, a shielding material (
Any material, method, or means can be used as long as it improves the slippage between the materials or between the shielding material and the fabric, and the materials may be solid, liquid, or gas. It doesn't matter if it is. However, it is preferable to use a non-woven material that does not take up much space and maintains its slipping properties over a long period of time. molybdenum disulfide,
There is a method of attaching inorganic powder such as silica, graphite, talc, etc. to the surface. The sliding powder is preferably a fine powder with an average particle diameter of IQQ- or less, particularly 50 grains or less, and is particularly preferably spherical or nearly spherical. In addition to the sliding powder, sliding materials such as polytetrafluoroethylene sheets with low friction coefficients, especially static friction coefficients of 0.2 or less,
Furthermore, there are methods of inserting a film or sheet of 0.1 or less, a slippery woven fabric such as silk, a non-woven fabric, or paper, a method of applying oil to the surface, a method of enclosing a gas such as nitrogen gas into protective clothing, A method of applying slippery processing such as embossing to both or either of the base material layer (2) and the reinforcing layer (3), or a method of applying a slippery process such as embossing to both or either of the base material layer (2) and the reinforcing layer (3), or using a Teflon sheet to form both or either of the base material layer (2) and the reinforcing layer (3). A method using a material having a low coefficient of friction such as the above, or a combination of the above methods can be considered.

The remarkable effects of the embodiments of the radiation shielding laminate of the present invention will be shown below in comparison with the performance of comparative examples.

Examples 1 to 14, Comparative Examples 1 to 4 A sheet of various organic polymers shown in Table 1 was placed on one side of a 100% thick pure lead (purity: 99.95% by weight) sheet as a base layer (2). A polyethylene sheet with a thickness of 70 m was used as a reinforcing layer (3) on the remaining one side for the purpose of protecting the bare lead surface, and was bonded with a urethane adhesive.

Three such sheets were placed on each base material layer (2 and polyethylene layer (3).
) were stacked facing each other and a thin layer of starch powder (average particle size: about 15 side) was interposed therebetween to form a slipping layer, thereby producing radiation shielding stacks of Examples of the present invention and Comparative Examples.

A sample of 10 cm x 30 cm was cut out from each stack (ton), and the sample was sealed in a flat bag made of thin polyester fiber with a diameter of about 12 cm x 35 cm, the inner surface of which was coated with starch powder, and the following flexibility test was conducted. The results are shown in the same table. From this result, it can be understood that the comparative example is prone to wrinkles and has a strong stiff feeling, whereas the example of the present invention has extremely excellent flexibility and pliability, and has a low wrinkle residual rate.

Flexibility test Hold the above test sample between both hands and perform 1
After repeatedly compressing and releasing the material 0 times and examining the suppleness felt by the listener, it was disassembled and each shielding material QO) was examined for residual wrinkles and evaluated on the following five scales.

Excellent: Extremely flexible, with no significant wrinkles remaining in the test sample after 5 minutes of repeated compression.

Excellent: Remaining wrinkles are equivalent to Excel, or slightly inferior to Excel in terms of suppleness.

Good: The suppleness is the same as that of excellent, but the amount of wrinkles remaining is greater than that of excellent.

Fair: Strong feeling of stiffness and large amount of remaining large wrinkles.

Unacceptable: Extremely stiff or a large amount of extremely large wrinkles remain.

[Examples 15 to 20 and Comparative Examples 5 to 6 Examples 15.1G and 17 use 9102 powder (Example 15) with an average particle size of 12 mm and polyamide powder with an average particle size of 7 mm as sliding materials, respectively. Spherical powder of methyl methacrylate (Example 1
6) Same structure as Example 1 except that nylon gauze (Example 17) was used. In Example 18, the surface was uneven by embossing in advance (the height between the valleys and the distance between the peaks were approximately 10A).
II11) Same structure as Example 1 except that the applied urethane rubber and polyethylene were used and starch powder was not used. In Examples 19 and 20, 5I02 powder with an average particle size of 12 holes (Example 19) and spherical polymethyl methacrylate powder with an average particle size of 7 particles (Example 20) were used as slipping materials. It has the same configuration as No. 11.

Comparative Examples 5 and 6 are the same as Example 1 except for the sliding material.
．． It has the same configuration as No. 11.

Table 2 shows the results of evaluating these using the flexibility test method described above.

Next, regarding the radiation protection suit of the present invention, the fourth <Mi~tC>
The exemplary embodiment shown in FIG.

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).
Of these, it has an upper torso that covers the part above the waist, a lower torso that covers the part below the waist, a back part that covers the shoulder flaps of the back, and a side part that covers the sides of the torso. and attach the string 4 to the upper body (21
It is designed to be tied around the middle between 1 and the lower body part n. The outer fabric of such protective clothing is made by sewing, fusing, welding, gluing, pasting, etc. the fabric shown in FIGS. 1 and 2.

In addition, the outer fabric is made into a bag by sewing, fusing, welding, gluing, pasting, etc. the front material and back material at the side edges, and inside the material there are laminate (10
0) is entered. The laminate (100) is required to have a shape and size that can cover at least the torso when worn, but in the example of FIG.
21) are also placed on the lower torso n, back, and side Q4, so that even if the wearer moves freely or bends at the waist, they are sufficiently shielded from radiation.

The number of shielding materials □□□ in the planting body (100) that covers the trunk is preferably 2 to 6, particularly 3 to 5.

Generally, on the premise of ensuring a constant lead thickness, if the number of lead sheets is small, the flexibility will be poor, while if the number of lead sheets is large, the flexibility will be good, but the thickness of the lead sheet (1) used will be small and the base material 11 will be poor. The proportion of lead in (2) decreases, resulting in an increase in overall weight.

On the side shown in Fig. 4, the laminate (100) is encapsulated in the fabric 01), but the fabric 01) is not necessarily necessary, and the laminate (100) alone can cover the entire protective suit or at least the torso. may be configured. In this case, in order to improve the aesthetics or appearance, the outer surface of the laminate (100) may be printed or a decorative outer cover, such as a patterned fabric, may be attached with an adhesive. In addition to the shape shown in FIG. 4, the protective clothing of the present invention may have a vest, poncho, gown, coat, armor, or other shapes, or may be a two-piece top and bottom. good.

As mentioned above, the laminate, which is a specific invention of the present invention, has good flexibility, so protective clothing using it also has excellent flexibility, that is, comfort, but depending on the shape of the clothing and the state in which the membrane is worn. If a person sits down or bends over with clothes on, the pile of material covering the upper torso (211) may rise upwards, pushing up the person's throat or chin, or lifting the shoulders. This problem occurs when a protective suit with a laminate enclosed in a bag with a length approximately equal to the length of the laminate is worn close to the wearer's torso. If you sit in this state, you will be trying to bend the semi-cylindrical body or cylindrical body almost at its center, so no matter how flexible the material that makes up the cylinder is, In some cases, the above-mentioned pushing-up phenomenon is likely to occur.

This push-up phenomenon can be reduced by various embodiments of the present invention, and the following is one example thereof.

■Protective clothing is constructed only from laminates, without using fabric bags or the like.

■The laminate is stored in a bag made of fabric that is longer and wider than the length and width of the laminate, so that the laminate does not touch the bottom or side of the bag even when the wearer is seated (bending). Allow them to freely run away downward or to the left or right.

- Use a band for the protective clothing that can securely secure the protective clothing to the wearer's waist, and securely secure the protective clothing so that the upper and lower parts of the protective clothing band can bend independently from each other.

(2) A more flexible material is used as the 82 lightning bolt body of the present invention used to form protective clothing.

(2) To make the protective clothing of the present invention a two-piece piece (upper and lower), or to make the stack easier to bend around the waist even if it appears to be one piece, the lower torso can be disassembled into several parts in the vertical direction.

■The torso (the part where the heavy body of the present invention is essential) and the side parts of the protective suit are divided and hung from the shoulders to help escape up, down, left and right.

(2) The number of shielding materials used in the stack of the present invention constituting the side portions (24) of the protective clothing is slightly less than the number of shielding materials used in the body portion, or is zero, to reduce the bending rigidity of the protective clothing.

■The stack is divided into upper and lower parts, with the upper stack being fixed to the shoulder area and the lower stack being fixed to the outer fabric at the lower edge of the lower torso, so that it can slide freely on the lap part and prevent it from pushing up.

■Inside a bag made by pasting a lead sheet (1) on the inside of the outer fabric and pasting a base material layer (2) on one side of the lead sheet (1) to integrate the outer fabric and shielding material 00). Insert a stack with a width that covers only the body, and allow the inserted stack to slide up and down and escape.

[Phase] A structure that combines the uniformity of shielding of the stack, its light weight, and the flexibility of the own ship's sheet.In other words, the stack is divided into upper and lower parts at the waist, and the divided parts are connected with the own ship's sheet to improve flexibility. let

Figures 9a to 9b to be described later, or Examples 24 and 25.
In step 6, the flexibility is improved by using the ship's own sheet for the side stack (100d) or the full-face stack (100e).

Among the above, preferred are (1) and (2), and a combination of both (1) and (2) is particularly preferred.

Next, preferred embodiments of the protective clothing of the present invention will be described based on the drawings.

Embodiment 21 In FIG. 4a, the stack (100) is fixed to the outer fabric at the upper body part of the head of the protective suit (2'D only, or at the shoulder part which is the upper part of the upper body part +211). The parts are not fixed to the outer fabric but are kept separate, ie the stack (100) is suspended inside the bag-like outer fabric.

The lower edge of the lower torso n of the protective clothing ■ may be closed by sewing or may be open, but there must be a distance of at least 100 mm between this lower edge and the lower edge of the stack (10G). It is preferable to have (d). Also, the stack (
It is preferable to leave a distance of about 20 am between the side edge of the protective suit (10G) and the side edge of the protective suit (2). - In the case of this embodiment, when the wearer bends his or her waist, the stack (100) will move downward within the bag-like outer fabric, so it will not be pushed upwards. Since it glides well using a slipping means such as starch powder, it can escape downward very smoothly, which is very desirable in terms of improving workability.

Example 22 In Figures 5a and 5b, (20a) is an outer fabric sewn into a bag shape. The stack (100) in this embodiment is divided into upper and lower parts, the upper stack (100a) is fixed to the outer fabric at the shoulder part of the protective suit head, and the lower stack (t
oob) is fixed at the lower edge of the lower trunk n.

In the protective clothing ■ of this example, when the wearer bends his or her waist, the upper stack (Iota) shifts downward (in the direction of the arrow (small direction)).
The lower stack (100b) shifts upward (in the direction of the arrow crest) and bends forward to escape the thrust.

Example 23 As shown in Figures 6a-6b, in this example the stack (100) is divided into three pieces. In the figure (
100c) is a central stack, and (100d) is a side stack, both of which are composed of several sheets of shielding material (IQ). The central stack (100c) is the stack of Example 21 (10
This is similar to item 0), in which the shoulders of the protective suit (■) are fixed to the outer fabric, and the other parts are placed inside the outer fabric in a suspended state. Also, there is a distance of approximately 100 + am between the central stack (100G) and the lower edge of the protective suit (2). The side stack (100d) is the side Q4 of the protective suit ■
However, it is preferable that this side stack (100d) is also arranged in a suspended state with its upper part fixed to the outer fabric.

In the protective suit ■ of this example, when the wearer bends his or her waist, the center stack (100c) slides downward and misses the push-up, but the center stack (100c)
00d), it is easy to shift downwards, and the side stacks (100d) also shift downward and to the left and right depending on the degree of flexion, so the wearer feels extremely reluctant to bend the waist. disappears.

Example 24 As shown in Figures 7a-7b, in this example the stack (100) consists of a narrow central stack (1008) and a full area stack whose width extends to the sides (2/!j). (100c)
It is made up of. The front of the prisoner in protective clothing is a full-face stack (
100e) is overlaid with a central stack (100c);
For example, the number of shielding materials (goods) is 4, but on the side Q4 of the protective clothing ■, the total area is only heavy (lone),
For example, the number of shielding materials (K) is two.

In the case of this embodiment, when the wearer bends at the waist, the center stack (lone) tends to shift significantly relative to the total area weight (100e), so thrusting up can be effectively prevented, and the side Since the number of shielding materials (00) on the side portions is smaller, it is more flexible and lighter than the one with four shielding materials (K)l on the side portions.

Example 25 As shown in FIGS. 8a and 8b, this example includes side stacks (100 d
) and, for example, a central stack consisting of four shielding materials 00) (
, 100c). In other words, this example is a compromise between Example 3 and Example 4, and the number of shielding materials □□□ constituting the side stack (load) in Example 23 is reduced to about 1/2. ing.

In this example, since the number of side stacks is small,
It's flexible and lightweight, making it easier to move, and allows for even lighter thrusts.

Example 2G As shown in FIGS. 9a and 9b, in this example, the stack (100) is divided into upper and lower parts, and the upper stack (100) is divided into upper and lower parts.
The shielding material 00) and the lower stack (100
The shielding material 00) constituting b) is connected with a gold powder rubber sheet or a polyvinyl chloride sheet. The gold powder rubber sheet or polyvinyl chloride sheet 02J has sufficient flexibility, so when the wearer bends at the waist, the gold powder rubber sheet or polyvinyl chloride sheet 02J bends to absorb the thrust. be done. The shielding material M and the ship's own rubber or polyvinyl chloride sheet (+21) are bonded by adhesion, fusion, adhesive, etc.

Example 27 As shown in Figures 10a-10b, in this example, the stack (100) is divided into upper and lower parts, and the upper viTI body (l
QOa) is fixed to the outer fabric of the protective suit ■, and the lower stack (
100b) is connected to the lower stack (100a) without being fixed to the outer fabric at all. Upper stack (10
0a) is entirely fixed to the outer fabric (20a) by adhesive or other methods, but the lower stack (100b) can freely move downwards relative to the outer fabric. Note that the upper stack and the lower stack may not be separate bodies but may be integrated.

In this embodiment, the lower stack (100b) moves downwardly relative to the outer fabric, thereby avoiding thrusting when the wearer bends at the waist.

Embodiment 28 As shown in FIG. 11, in this embodiment, the lower body portion is vertically separated into several pieces. The number of pieces on the lower body is 2.
~3 sheets is preferred, and adjacent lower pieces are given some overlap.

In this embodiment, the hem opens when the wearer bends at the waist, thereby preventing push-up.

Example 29 In Figures 12a and 12b, (20a) is the outer fabric of protective clothing (2) sewn into a bag shape. A lead sheet (1) similar to the lead sheet (1) constituting the shielding material 00) is pasted on each of the front and back sides of the outer fabric. Further, a cushioning material is pasted on one side of the lead sheet (1). As this cushion material ■, the base material layer (2
The same material as in 3 is used, and the lead sheet (1) is stretched by a method such as adhesion. A stack (100) consisting of several sheets of shielding material (101) is placed inside the bag-like structure as described above. This stack (100) has a width that covers only the front side of the protective suit (2).

In this example, when the wearer bends his/her waist, the stack (10
0) can avoid being pushed up downwards inside the protective suit (2). Further, this embodiment has advantages such as further weight reduction and cost reduction in manufacturing protective clothing.

Example 30 This example differs from Examples 23, 24, and 25 in that a gold powder sheet is used for the side stack (load) or the full-face stack (100e).

In this embodiment, a lightweight stack with uniform shielding performance is used on the front, and flexible gold powder sheets are used on the sides, thereby further improving comfort without sacrificing uniform shielding performance and weight reduction.

Example 31 This example is characterized in that the torso of the protective suit (2) is strongly tightened with a belt. The protective clothing in this embodiment is one in which the stack (10G) is fixed almost entirely to the outer fabric of the protective clothing, or the protective clothing shown in FIG. 4 is used.

In this example, when the wearer bends at the waist, the stack (1
00) is forcibly bent, thereby preventing push-up.

Example 32 This example uses the shielding material QO shown in Figures 13a-13e.
) are the constituent elements of the stack (100).

The shielding material shown in Figure 13a is made by laminating the own ship's own rubber sheet or polyvinyl chloride sheet 04) on one side of the lead sheet (1), and the shielding material shown in Figure 13b is made by laminating a lead sheet (1) on one side of the lead sheet (1).
A reinforcing layer (3) such as a polyethylene sheet is placed on the other side of 1).
), the shielding material (to) in Figure 13c is a lead sheet (1) with own ship's rubber sheet or polyvinyl chloride sheet 04) pasted on both sides, and the shielding material (1) in Figure 13d is
0) is one in which own ship's own rubber sheet or polyvinyl chloride sheet (14) is laminated between two lead sheets (1).
The shielding material (to) shown in Figure 3e is made by laminating the reinforcing layer (3) on the surfaces of two lead sheets (1).

Since the shielding material η of this example has a flexible ship's own rubber sheet or polyvinyl chloride sheet (141) as the base material layer, the stack (100) made of it as the main material also has flexibility. Therefore, When the protective clothing of Examples 21 to 31 was made using the Gagaru stack (100), the Gagaru stack (100) was also used.
100) can be prevented from being pushed up.

Each of the embodiments has been explained above, but in each of the above embodiments, the shielding material M is made by a sliding means.The good sliding properties of Shishi and the escape function against the outer fabric of the stack (100) are solidified, and the wearer No matter how the worker bends while working,
Push-up is less likely to occur and work can be done easily.

Moreover, in the embodiment, the workability is high because it is lightweight and unobtrusive. It has high strength against repeated bending under its own weight, so it can be hung on a regular hanger, and maintenance is easy. It also has the advantage of being highly reliable, without causing a stiff feeling or breaking the internal lead sheet even after long-term use.

[Effects of the Invention] The radiation shielding stack of the present invention and the radiation protective clothing using the same both have excellent radiation shielding properties and flexibility, and are lightweight. Furthermore, the radiation protection suit is flexible and extremely comfortable to wear, reflecting the good flexibility of the stack.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a partial cross-sectional view of a stack according to one embodiment of the present invention, FIG. 2 is a partial cross-sectional view of a stack according to another embodiment of the present invention, and FIG. 3 is a partial cross-sectional view of a stack according to another embodiment of the present invention. Figures 1 and 2 are partial sectional views of the shielding material, Figures 4a and 4c are front views, rear views, and side views of one embodiment of the radiation protective clothing of the present invention, and Figures 5a and 5b are examples of the embodiment. Figures Ga-Bb are a front view and a cross-sectional view along the line (B)-(B) of the protective clothing of Example 23, and Figures 7a to 7b are The figure is a front view and a sectional view taken along the line (C)-(C) of the protective clothing of Example 24, and Figures 8a to 8b are a front view and a sectional view taken along the line (D)-(D) of the protective clothing of Example 25, Figures 9a-9b are Example 2B
A front view and a partial sectional view taken along the line (E)-(E),
10a-10b is a front view and a partial sectional view taken along the line (P)-(F) of the protective suit of Example 27, and FIG. 11 is a front view of the protective suit of Example 27.
FIGS. 12a and 12b are a front view and a sectional view taken along line (G)-(G) of the protective clothing of Example 29, and FIGS.
Figures a to 13e are partial cross-sectional views of the shielding material in Example 32, and Figure 14 is a Young's modulus-thickness relationship graph for the base material layer. (Main symbols of the drawing) (1): Lead sheet (2) Two base material layers (3): Reinforcement layer (goods): Shielding material■: Protective clothing (100): Radiation shielding stack 248mm Figure 4b pL 712b figure

Claims (1)

[Scope of Claims] 1. At least two shielding materials each consisting of a lead sheet and a flexible or elastic base material layer laminated on at least one side of the lead sheet, and between adjacent shielding materials. A stack for radiation shielding characterized by being provided with a sliding means. 2. The radiation shielding stack according to claim 1, wherein the lead sheet is made of pure lead with a purity of 99.8% by weight or more. 3. The radiation shielding stack according to claim 1 or 2, wherein the base layer is made of an elastomer with a thickness of 10 to 50,000 μm. 4. The radiation shielding stack according to claim 3, wherein the elastomer is a mixture of inorganic powder with high specific gravity. 5 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) (The first value in parentheses is Young's modulus kg/mm^2 The radiation shielding according to claim 1 or 4, wherein the value of . . 6. The radiation protective suit according to claim 1 or 4, wherein the base layer is made of a flexible organic polymer foam.7 The base layer is made of organic or inorganic foam. 8. The radiation shielding stack according to claim 1 or 4, comprising a woven fabric, nonwoven fabric, mat or blanket of fibers. 8. The radiation shielding stack according to item 1, item 2, item 3, item 4, item 5, item 6, or item 7. 9. The sliding means is a sheet, woven fabric, or nonwoven fabric with a low coefficient of friction. or paper. 10. The radiation shielding stack according to claim 1, 2, 3, 4, 5, 6 or 7, which is made of paper. 10. The covering clothing component consists of a stack of at least two shielding materials each consisting of a lead sheet and a flexible or elastic base material layer laminated on at least one side of the lead sheet, and a structure in which there is no slip between adjacent shielding materials. 11. A radiation shielding suit characterized by comprising a stack of radiation shielding bodies provided with a radiation shielding stack. Protective clothing. 12. Radiation protective clothing according to claim 11, wherein the push-up prevention means uses one or more of the following means in combination. (1) Radiation shielding stack (hereinafter referred to as stack) only (2) The stack is stored in a bag that is longer and wider than the length and width of the stack, so that even when the wearer is seated (when the suit is bent), the stack remains at the bottom of the bag. Alternatively, it should be possible to escape freely downward or to the left or right so that it does not get caught on the side. (3) Use a band for the protective clothing that can securely secure the protective clothing to the wearer's waist. (4) As the stack used to form the protective clothing, one with even better flexibility is used. (5) Even if the protective clothing of the present invention is made up of two pieces (top and bottom), or even if it looks like one piece, the stack will not touch the waist area. In order to make it easier to bend, the lower torso is divided vertically into several parts. (6) Divide the torso and side parts of the protective suit. (7) The bending rigidity of the protective clothing is reduced by reducing the number of shielding materials used in the stack forming the side portions of the protective clothing compared to the number of shielding materials used in the torso, or zero. (8) A lead sheet is attached to the inside of the outer fabric, a base material layer is attached to one side of the lead sheet (1), and the outer fabric and shielding material are integrated, but only the torso is placed inside the bag. Insert a stack with the width to cover, allowing the inserted stack to slide up and down.