JP6391149B2 - Radiation shielding composite film - Google Patents

Description

  The present invention can be used in a radiation environment such as a nuclear power plant, a spent nuclear fuel reprocessing facility, a nuclear facility such as a proton accelerator, a medical site for performing radiation therapy, and other industrial / medical radiation inspection machines. More particularly, the present invention relates to a radiation shielding composite film suitable as a film material for radiation shielding water sacs.

  In recent years, facilities that handle radioactive materials such as nuclear power plants have been shielded against radiation, but most of them use concrete or metal as a shielding material. For example, in the case of concrete, a thickness of at least several tens of centimeters is required, so it is very heavy and difficult to move, so it is used for permanent facilities. The same applies to metals. When radiation shielding is performed temporarily or when shielding is performed at a different location, it is difficult to deal with concrete or metal shielding materials due to their high weight.

  Therefore, radiation shielding using water is being studied. Water is used as a radiation shielding material. When necessary, water is poured into the water sac to form a pool-shaped shielding material, and when it is not necessary, the water is extracted to reduce the weight and enable movement. For this purpose, a water sac for storing a large amount of water is required.

  However, since a large amount of water is required for radiation shielding, the membrane material used for the water sac is strong, radiation-resistant (that is, does not deteriorate under radiation), and has radiation shielding performance. Is desirable. Usually, the membrane material used for the water sacs is a rubberized cloth with chloroprene rubber on both sides of a nylon fabric, but both nylon and chloroprene rubber have problems with radiation resistance, and under high radiation, they can be used in a short period of time. Since it deteriorates, it cannot be used.

  Patent Documents 1 to 5 propose radiation shielding materials in which heavy metal powder is mixed with rubber. Patent Document 1 is a mixture of chlorine-containing rubber with tungsten powder, Patent Document 2 is a mixture of ethylene propylene rubber and isoprene rubber with a predetermined weight ratio of lead oxide powder, and Patent Document 3 is a fluororubber. In Patent Document 4, tungsten powder or the like is mixed in EPDM, and in Patent Document 5, tungsten powder or tungsten compound powder is mixed in butyl rubber or polyisobutylene rubber.

However, although these radiation shielding materials play a role as radiation shielding materials, they contain a large amount of heavy metal powder, so the tensile strength is low, and in order to obtain a satisfactory tensile strength, it is necessary to increase the thickness extremely. . For example, the rubber composition of Example 3 described in Patent Document 1 has a tensile strength of 3.13 MPa according to a tensile test and is too low in strength to be used as a large water sacs. Is estimated as 500 N / 30 mm strong need as a membrane material for Suino, when using the rubber composition of 3.13MPa, the thickness becomes more than 5 mm, since more specific gravity is 12.8, 1 m ² per Will weigh more than 64kg. When this membrane material is used, the water sacs themselves become heavy and the ease of movement is impaired. Further, since the elongation of the rubber composition is as low as 85% and the followability to deformation is poor, there is a risk of water leakage.

  Further, Patent Document 6 proposes a composite tube material for artificial weir in which a thermoplastic resin coating layer made of soft vinyl chloride is formed on both surfaces of a fiber fabric. Such a tube material is made of the resin used. There is a problem with radiation resistance, so it cannot be used under high radiation.

  It is also conceivable to produce a rubberized cloth of a fiber fabric by using the radiation shielding rubber composition described in Patent Document 1 and the like to form a radiation shielding composite film, but a rubber composition containing a large amount of tungsten powder or the like. Has an extremely poor adhesive property with a fiber fabric, and there is a problem that a confidential composite film suitable for water sacs cannot be obtained.

JP 2003-96240 A Japanese Patent Laid-Open No. 8-110393 Japanese Patent No. 3555764 Japanese Patent No. 3949509 JP2013-242270A JP 2004-197552 A

  In view of the background of such prior art, the present invention is a high-strength, lightweight, radiation-resistant and capable of retaining a large amount of water when used as a membrane material for radiation shielding water sacs used in a radiation environment. It is an object to provide a film material having excellent radiation shielding properties.

  As a result of investigating a film material having high strength and excellent radiation resistance and radiation shielding properties in order to solve the above problems, a resin coating layer is formed on at least one surface of a high strength fiber fabric to form a rubberized cloth, and the rubber When a radiation shielding resin layer containing tungsten or the like is laminated on the pulling cloth and the thickness ratio of the radiation shielding resin layer to the rubberized cloth is in a specific range, it has been found that unexpected problems can be solved at once. The present invention has been completed.

That is, the present invention includes a fiber fabric as a base fabric, a resin coating layer including at least one of a thermoplastic resin and an elastomer is formed on at least one surface thereof, and a radiation shielding resin layer is laminated on the resin coating layer. A radiation shielding composite film, wherein the radiation shielding resin layer has a thickness of 1 mm to 10 mm and is 1.2 to 20 times the thickness of the resin-coated fiber fabric. A shielding composite membrane is provided.

  The radiation shielding composite film of the present invention is lightweight and has high tensile strength, has good workability and moldability when used for a water sacs, and does not cause coating resin deterioration or cracking due to radiation. Therefore, it is suitable as a membrane material for large water sacs used under high radiation. In particular, it is suitable as a film material for radiation shielding water sacs used as a mobile shielding material when shielding radiation from a nuclear power plant reactor.

It is explanatory drawing explaining the laminated structural example of the radiation shielding composite film of this invention.

  The radiation shielding composite film of the present invention is formed by laminating a fiber coating, a resin coating layer containing at least one of a thermoplastic resin and an elastomer, and a radiation shielding resin layer. FIG. 1 shows a preferred laminated configuration example. 1 is a radiation shielding composite film, 11 is a fiber fabric, 12 is a resin coating layer, and 20 is a radiation shielding resin layer.

  A preferable application example of the radiation shielding composite film of the present invention is a radiation shielding water sacs. In particular, it is suitable for a radiation shielding water sac installed in place of radiation shielding concrete at the upper part of a nuclear power plant nuclear reactor. A nuclear power plant reactor is usually housed in a containment vessel and is shielded in double and triple so that radiation does not leak outside. The outside of the reactor containment vessel is surrounded by thick concrete to prevent radiation leakage to other rooms in the building. In particular, the upper part of the containment vessel uses divided concrete for taking in and out fuel rods in the reactor. However, even though it is divided, it is quite heavy and not so easy to move. Therefore, it is possible to perform sufficient radiation shielding by removing a part of the shielding concrete, attaching a radiation shielding water sacks thereto, and filling the water sacs with water. When taking out the contents of the reactor containment vessel, the water bladder can be drained and the empty water bladder can be moved to obtain a sufficient space for removal. After the removal is completed, it is sufficient to inject water into the water sac to inflate it, so that shielding and non-shielding can be switched without using a large heavy machine, which is very effective.

  In the radiation shielding composite film of the present invention, a resin coating layer is formed on at least one surface of the fiber fabric, and the thickness of the radiation shielding resin layer laminated thereon is 1.2 to 20 times the total thickness of the fiber fabric and the resin coating layer. There is a feature in the point. When the thickness of the radiation shielding resin layer is larger, the radiation shielding effect is improved. However, in consideration of a general thickness (about 1,000 μm or less) of a fiber fabric and a resin coating layer described later, the radiation shielding resin layer exceeds 20 times (2 cm). Is not suitable as a membrane material for water sacs due to poor follow-up to deformation of the membrane material. On the other hand, when considering the radiation shielding ability by the radiation shielding resin layer and the use environment of the film material, the radiation shielding effect may be insufficient when the ratio is less than 1.2 times. From the viewpoint of a balance between radiation shielding ability and followability to deformation, the thickness of the radiation shielding resin layer is more preferably 2 to 15 times, more preferably 3 to 10 times the total thickness of the fiber fabric and the resin coating layer. It is good to do.

  Next, the structure and manufacturing method of the radiation shielding composite film of the present invention will be described.

In the present invention, the fiber fabric serves as the base fabric of the radiation shielding composite film, so that the tensile strength according to JIS L 1096: 2010 “Fabric and knitted fabric test method” 8.14.1 JIS method A method (strip method). Is preferably a high-strength fiber fabric having 500 N / 30 mm or more. If the tensile strength of the fiber fabric is not less than the above value, it is sufficient as a membrane material for a large water sacs. The fiber fabrics, woven, knitted, mesh-like material are preferably those composed of at least one tissue selected from the honeycomb-like material, textile or honeycomb-like material is preferably used from the particular intensity points. The weaving structure is not particularly limited, but plain weaving, oblique weaving, satin weaving and the like are preferable.

  The fiber constituting the fiber fabric is preferably a fiber capable of forming a fiber fabric having high strength, and examples thereof include general-purpose fibers such as nylon fibers and polyester fibers, and high-strength fibers. In order to use as a water sac as large as possible, it is preferable that high strength fibers having a tensile strength of 15 cN / dtex or more based on JIS L 1013: 2010 “Chemical Fiber Filament Yarn Test Method” are included.

  Examples of the high-strength fibers include aramid fibers, carbon fibers, glass fibers, boron fibers, ceramic fibers, polyketone fibers, polyparaphenylenebenzbisoxazole fibers, high-strength polyethylene fibers, and wholly aromatic polyester fibers. At least one selected from the group consisting of these high-strength fibers can be used. Aramid fibers are particularly preferred from the viewpoint of excellent radiation resistance. As the aramid fiber, either a meta-aramid fiber or a para-aramid fiber can be used, but para-aramid fibers are preferred from the viewpoint of excellent tensile strength. Examples of such para-aramid fibers include polyparaphenylene terephthalamide fiber (manufactured by Toray DuPont, trade name “Kevlar” (registered trademark)), copolyparaphenylene-3,4′-diphenyl ether terephthalamide fiber (Teijin Techno Products) Product name "Technora").

As a particularly preferable fiber fabric, a fabric using para-aramid fiber (trade name: Kevlar) can be exemplified. To obtain a predetermined tensile strength, basis weight of the fabric 100 g / ^{m 2} or more part is desirable, for example, part number 732 (basis weight 109 g ^{/ m} 2), No. 728 (basis weight 224 g ^{/ m} 2), No. 710 (basis weight 314 g / m ² ) and the like are preferable. In terms of lightness, the fabric weight is preferably 500 g / m ² or less.

  The fineness of the fibers constituting the fiber fabric is preferably as thick as possible from the viewpoint of strength, but if it is too thick, the processability into the fabric is inferior, so that too thick fibers are not suitable. On the other hand, the fiber fineness is preferably 220 dtex or more from the economical viewpoint. A preferred fineness is 220 to 8,000 dtex, and a more preferred fineness is 220 to 6,300 dtex.

  In the radiation shielding composite film of the present invention, a resin coating layer containing at least one of a thermoplastic resin and an elastomer is formed on at least one surface of a fiber fabric serving as a base fabric to obtain a resin-coated fiber fabric. It is preferable to cover both sides of the fiber fabric from the viewpoint of airtightness (preventing water leakage). By coating one or both sides of the fiber fabric with a thermoplastic resin or elastomer, not only a high strength membrane material can be obtained by laminating the radiation shielding resin layer and the resin-coated fiber fabric, but also the airtightness of the membrane material. And follow-up to deformation is improved. Examples of a method for forming a resin coating layer on a fiber fabric to obtain a resin coated fabric include the following methods.

  That is, a general rubberized cloth manufacturing method is applied to coat and adhere a paste-like vinyl chloride composition sol on one or both sides of a fiber cloth, and this is heated and gelled to form a resin coating layer. Alternatively, a method may be used in which an elastomer is dissolved in a solvent, applied to a fabric, topped with a calender roll (rolled into a sheet), and then heated for vulcanization to produce. Further, a stretchable thermoplastic resin or thermoplastic elastomer film or sheet is superposed on at least one surface, preferably both surfaces, of the fiber fabric, and they are heated at a temperature equal to or higher than the melting point of the thermoplastic resin or thermoplastic elastomer. Or the like may be combined by thermal fusion using a high-frequency welder, or may be combined by fusion using a high-frequency welder.

  Examples of the thermoplastic resin and elastomer include polyethylene resin, polypropylene resin, polystyrene resin, vinyl chloride resin, nylon 6 resin, nylon 6-6 resin, nylon 6-10 resin, polycarbonate resin, polyacetal resin, polyethylene terephthalate resin, poly Thermoplastic resins such as butylene terephthalate resin, polyphenylene ether resin, polyether ether ketone resin, polyetherimide resin, polysulfone resin, fluororesin, polyurethane resin, ionomer resin and modified resins of these resins; polyurethane elastomers, polyester elastomers , Styrene elastomer, olefin elastomer, nylon elastomer, vinyl chloride elastomer, butadiene elastomer, natural rubber, synthetic rubber Elastomers and the like. Each of these thermoplastic resins and elastomers may be used alone or in combination of two or more.

  Among the thermoplastic resins and elastomers described above, those having an elongation at break of 100% or more measured according to JIS K 7127: 1999 “Plastics—Test Method for Tensile Properties” are preferred, more preferably 150% or more. More preferably, the material is 300% or more. By using a highly stretchable material, it is possible to prevent the resin coating layer from cracking when the shape of the water sac is deformed by water injection or movement, thereby reducing the airtightness of the membrane material. Preferred materials are vinyl chloride and elastomer, and particularly preferred materials are vinyl chloride, chlorosulfonated polyethylene (trade name Hypalon), polychloroprene (trade name Neoprene), EPDM rubber, polyurethane elastomer and the like.

  As for the thickness of the resin coating layer, one side is required to be 200 μm or more in order to secure confidentiality as a water sac, but on the other hand, one side is preferably 1,000 μm or less for weight reduction. A preferred thickness is in the range of 300 μm to 800 μm. The thickness of the resin-coated fabric is preferably 400 μm to 2 mm, more preferably 400 μm to 1.5 mm. If the thickness is less than 400 μm, the resin coverage of the fiber fabric serving as the base fabric may be reduced. On the other hand, if the thickness exceeds 2 mm, depending on the type of resin or elastomer, There is a risk that processability and formability will be reduced.

  The resin used for the radiation shielding resin layer may be the same type as that of the resin coating layer or a different type. From the viewpoint of adhesion between the resin layers, it is better to use the same kind of resin. Examples of the radiation shielding material include known tungsten powders, tungsten compound powders, lead oxide powders, and the like. Among these, tungsten powders are preferable from the viewpoint of good workability.

  The radiation shielding resin layer can be obtained by a known method described in Patent Documents 1 to 5 and the like. For example, chlorosulfonated polyethylene (trade name Hypalon) or the like is wrapped around a roll of moderate diameter, and tungsten powder is gradually added and mixed thoroughly, and then a vulcanizing agent, an activator, and a vulcanization accelerator are added. It can be mixed to obtain a radiation shielding resin and adjusted to an appropriate thickness using a heating press.

The thickness of the radiation shielding resin layer varies depending on the radiation dose in the usage environment, but taking into account the ease of handling a water sac using a radiation shielding composite film, 1 mm to 10 mm is preferable, more preferably 1 mm to 5 mm. It is.

  In addition, the fiber cloth formed with the resin coating layer and the radiation shielding resin layer can be laminated by various methods, for example, a method of bonding using a rubber adhesive, a method of sewing using a high-strength thread. Etc. It is desirable that the seam be treated to prevent water leakage with a sealing material.

  EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples and comparative examples, but the present invention is not limited to the following examples. The radiation shielding composite film was evaluated by the following method.

(Weight)
Based on JIS K 6404-2-2 “Testing method for rubber and plastics”, the mass of the composite film per 1 m ² was measured.

(Thickness)
The thickness was measured based on JIS K 6404-2-3 “Testing Method for Rubber and Plastic”.

(Evaluation of radiation resistance)
Regarding the evaluation of radiation resistance, after irradiating the sheet-shaped radiation shielding composite film with radiation, the radiation shielding resin layer is removed, and a tensile test of the resin-coated fiber fabric is performed to determine the tensile strength before and after the radiation irradiation. Were comparatively evaluated. The irradiation was performed by irradiating γ rays (Co 60) at room temperature (in the air) and completing the irradiation with a cumulative absorbed dose of 10 kGy.
If the strength after irradiation was less than half that before irradiation, it was rated as x, if it was holding 50% to 70% strength, Δ, and if it was 70% or more, it was rated as ○.

[Example 1]
As the fiber fabric, Kevlar fiber fabric No. 710 (fiber: Kevlar K29, fineness: 1670 dtex, weaving density: 24 / inch × 24 / inch, basis weight: 319 g / m ² , thickness: 0.43 mm) was used.
On both sides of this fiber fabric, paste vinyl chloride composition sol (composition: paste vinyl chloride 100 parts by mass, phthalate ester plasticizer 60 parts by mass, Ba-Zn composite stabilizer 2 parts by mass, epoxy soybean oil 3 parts by mass, Ca 10 parts by mass of a system filler, 2 parts by mass of a crosslinking agent, and 2 parts by mass of a white pigment) were uniformly coated with a knife and gelled by heating at 170 ° C. to obtain a fiber-reinforced fabric coated with a double-sided resin.
The basis weight of this resin-coated fabric was 770 g / m ² , the thickness was 0.7 mm, and the tensile strength was 4,900 N / inch in the vertical direction and 5,300 N / inch in the horizontal direction.

A radiation shielding resin layer was produced by the following method. Wrap 300 parts by mass of chlorosulfonated ethylene (trade name Hypalon 40) on an 8-inch roll, gradually add 9,000 parts by mass of tungsten powder (tungsten D100, particle size 7.6 to 12 μm), and mix well, then vulcanize As an agent, 7 parts by weight of pentaerythritol, 9 parts by weight of magnesium oxide as an activator, and 4 parts by weight of dipentamethylene thiuram tetrasulfide as a vulcanization accelerator were added and mixed thoroughly. This composition was taken out from the roll in the form of a sheet and pressed at a temperature of 160 ° C. and a pressure of 20 MPa for 20 minutes to obtain a sheet-like molded body having a thickness of 1 mm. The basis weight of the radiation shielding resin layer was 1,270 g / m ² .

Finally, a radiation shielding resin layer and a resin-coated fabric were laminated. Lamination was carried out by laminating with a rubber adhesive and further sewing with a kevlar fiber sewing thread. Sealing tape was put on the seams to prevent water leakage. The radiation shielding composite film thus obtained had a thickness of 1.7 mm and a basis weight of 2,040 g / m ² .

[Example 2]
As the fiber fabric, Kevlar fiber woven product No. 732 (fiber: Kevlar K29, fineness 440 dtex, weaving density: 32 / inch × 32 / inch, basis weight: 109 g / m ² , thickness: 0.15 mm) was used.
Both sides of this fiber fabric were resin-coated under the same conditions as in Example 1 to obtain a fiber-reinforced fabric coated with both sides of the resin. The basis weight of this resin-coated fabric was 560 g / m ² , the thickness was 0.42 mm, and the tensile strength was 2,000 N / inch in the vertical direction and 2,000 N / inch in the horizontal direction.
A radiation shielding resin layer produced in the same manner as in Example 1 was laminated with a resin-coated fabric in the same manner as in Example 1.
The radiation shielding composite film thus obtained had a thickness of 1.42 mm and a basis weight of 1,830 g / m ² .

[Example 3]
A woven fabric (fineness: 1,660 dtex, weaving density: vertical 21 pieces / inch, horizontal 19 pieces / inch, basis weight: 215 g / m ² ) using polyester (PET) filaments was used as the fiber fabric.
Both surfaces of this fiber fabric were resin-coated under the same conditions as in Example 1 to obtain a fiber fabric coated with both surfaces of the resin. The basis weight of this resin-coated fabric was 670 g / m ² , the thickness was 0.6 mm, and the tensile strength was 2,370 N / inch in the vertical direction and 2,120 N / inch in the horizontal direction.
A radiation shielding resin layer produced in the same manner as in Example 1 was laminated with a resin-coated fabric in the same manner as in Example 1.
The radiation shielding composite film thus obtained had a thickness of 1.67 mm and a basis weight of 1,940 g / m ² .

[Comparative Example 1]
As the fiber fabric, Kevlar fiber fabric No. 710 (fiber: Kevlar K29, fineness: 1,670 dtex, weaving density: 24 / inch × 24 / inch, basis weight: 319 g / m ² , thickness: 0.43 mm) is used. It was.
Both surfaces of this fiber fabric were resin-coated under the same conditions as in Example 1 to obtain a fiber fabric coated with both surfaces of the resin. The basis weight of this resin-coated fabric was 770 g / m ² , the thickness was 0.7 mm, and the tensile strength was 4,900 N / inch in the vertical direction and 5,300 N / inch in the horizontal direction.
Unlike Example 1, it laminated | stacked with the radiation shielding resin layer, and it used for evaluation as a resin coating fabric.

[Comparative Example 2]
As the fiber fabric, a woven fabric using polyester (PET) filaments (fineness: 1,660 dtex, weave density: vertical 21 pieces / inch, horizontal 19 pieces / inch, basis weight: 200 g / m ² ) was used.
Both surfaces of this fiber fabric were resin-coated under the same conditions as in Example 1 to obtain a fiber fabric coated with both surfaces of the resin. The basis weight of this resin-coated fabric was 670 g / m ² , the thickness was 0.6 mm, and the tensile strength was 2,370 N / inch in the vertical direction and 2,120 N / inch in the horizontal direction.
Unlike Example 1, it laminated | stacked with the radiation shielding resin layer, and it used for evaluation as a resin coating fabric.

[Comparative Example 3]
In the same manner as in Example 1, a radiation shielding resin layer made of a sheet-like molded body having a thickness of 0.5 mm was obtained. This radiation shielding resin layer and the 0.7 mm thick resin-coated fabric obtained in Example 1 were laminated in the same manner as in Example 1 to obtain a radiation shielding composite film.

[Comparative Example 4]
A radiation shielding resin layer comprising a resin-coated fabric (thickness: 0.42 mm) obtained in Example 2 and a sheet-like molded body having a thickness of 10 mm produced in the same manner as in Example 1 was used in the same manner as in Example 1. Was laminated to obtain a radiation shielding composite film. However, the processability was poor, making it unsuitable for use in a water sacs.

  The above-mentioned Examples 1 to 3 and Comparative Examples 1 to 4 were evaluated for radiation resistance. In addition to the method described above, the radiation resistance was also evaluated for the appearance (crack, breakage, curing, etc.) of the coated rubber after irradiation. If there was no change in the appearance, it was evaluated as ◯, if there was a slight change, Δ, and if there was a large change, it was evaluated as x. In the comprehensive judgment, from the evaluation results of the lightness and radiation resistance of the film material, a practical one was evaluated as “good”, and a thin one was evaluated as “poor”.

  The evaluation results are shown in Table 1.

  As shown in Table 1, the radiation shielding composite film of the present invention has excellent radiation resistance as compared with Comparative Examples 1 and 2. In Examples 1 and 2 and Comparative Example 1, Kevlar fibers were used for the fabric, so the tensile strength retention after irradiation was high and the radiation resistance of Kevlar was confirmed to be good. However, in Comparative Example 1, the coating resin is deteriorated by radiation, cracks and the like are observed, and problems such as water leakage are considered when used as a water pouch. Comparing Comparative Examples 1 to 3 with Examples, the radiation shielding effect of the radiation shielding resin layer is recognized. The radiation shielding composite films of the examples have high tensile strength and are free from cracks in the coating resin layer, and are therefore suitable as radiation shielding water sacs.

  Although the present invention has been described above, it goes without saying that the present invention can be modified as appropriate within the scope of the claims.

  Since the radiation shielding composite film of the present invention has excellent radiation resistance and high tensile strength, nuclear power plants, spent nuclear fuel reprocessing equipment, nuclear accelerator-related facilities such as proton accelerators, medical sites for radiation therapy, and other industrial / It can be used for a medical radiation inspection machine or the like, and can be suitably used as a membrane material for a simple radiation shielding water sacs particularly under high radiation.

DESCRIPTION OF SYMBOLS 1 Radiation shielding composite film 11 Fiber fabric 12 Resin coating layer 20 Radiation shielding resin layer

Claims (8)

A radiation shielding composite film comprising a fiber fabric as a base fabric, a resin coating layer containing at least one of a thermoplastic resin and an elastomer formed on at least one surface thereof, and a radiation shielding resin layer laminated on the resin coating layer. The radiation shielding composite film is characterized in that the thickness of the radiation shielding resin layer is 1 mm to 10 mm and is 1.2 to 20 times the thickness of the resin-coated fiber fabric. Fiber fabric, woven, knitted, radiation shielding composite membrane according to claim 1, characterized in that composed of at least one tissue selected from the network-like material and the honeycomb-like material.   The thermoplastic resin and elastomer are selected from the group consisting of vinyl chloride resin, polyurethane elastomer resin, polyester elastomer resin, styrene elastomer resin, olefin elastomer resin, polyamide elastomer resin, butadiene elastomer resin, natural rubber and synthetic rubber. The radiation shielding composite film according to claim 1, wherein the radiation shielding composite film is selected.   The fiber is a high strength fiber, the tensile strength is 15 cN / dtex or more, and an aramid fiber, carbon fiber, glass fiber, boron fiber, ceramic fiber, polyketone fiber, polyparaphenylene benzbisoxazole fiber, high strength polyethylene The radiation shielding composite film according to claim 1, comprising at least one fiber selected from the group consisting of fibers and wholly aromatic polyester fibers.   The radiation shielding composite film according to claim 4, wherein the high-strength fiber is an aramid fiber.   The radiation shielding composite film according to any one of claims 1 to 5, wherein the radiation shielding resin contains at least one selected from the group consisting of tungsten powder, tungsten compound powder, and lead oxide powder.   The radiation shielding composite film according to claim 1, wherein the fiber fabric has a tensile strength of 500 N / 30 mm or more. The radiation shielding composite film according to claim 1, wherein the radiation shielding composite film is used for a radiation shielding water sacs.

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