KR101164742B1 - Neutron Radioactive Ray Absorption and Gamma Radioactive Ray Shield Sheet with Flexibility and Restoration, Cloth made thereby and Manufacturing Method thereof - Google Patents

Abstract

The present invention relates to a neutron absorbing and gamma-ray shielding sheet having flexibility and resilience, to a garment made therefrom and a method of manufacturing the same. The neutron-absorbing and gamma-ray shielding sheet according to the present invention includes boron carbide powder and the powder A neutron radiation absorbing sheet having a flexible and resilient sheet shape prepared by adding and mixing a composite with boron carbide; And a gamma radiation shielding sheet having a flexible and resilient sheet shape that is combined with the neutron radiation absorbing sheet and manufactured by adding a powdered lead and a compound to the powdered lead.
Accordingly, it is possible to provide a neutron absorbing and gamma ray shielding sheet having two functions that can be flexibly bent and resilient, easy to use, improve safety, and absorb neutron rays and shield gamma rays. have.

Description

Neutron radioactive ray absorption and gamma radioactive ray shield sheet with flexibility and restoration, cloth made thus and manufacturing method

The present invention relates to a neutron absorbing and gamma-ray shielding sheet, a garment made thereof, and a method for manufacturing the same, and in particular, a neutron-absorbing and gamma ray having a flexibility and resilience of a sheet shape that absorbs or shields neutrons or gamma radiation and has flexibility and resilience. It relates to a shielding sheet, a garment made thereof and a method of manufacturing the same.

Elements with very high atomic weights, such as uranium and plutonium, are so unstable that their cores are so heavy that they collapse. When these elements collapse and change into other elements, they emit some particles or electromagnetic waves, which are radiation. The elements that give out radiation are called radioactive elements, and their ability to give out radiation is called radioactivity. When these elements decay, there are three radiations: alpha (alpha) rays, beta (beta) rays, and gamma (gamma) rays. However, in general, when referring to diagonal lines, not only these three but also other particles or electromagnetic waves such as X-rays and neutron beams are often mentioned in combination. Radiation can be broadly classified into two types: alpha (alpha) rays, beta (beta) rays, and particle rays, which are particles that move like neutron rays, and electromagnetic waves such as X rays and γ (gamma) rays. Hereinafter, the representative γ (gamma) rays and neutron rays of the two will be described.

γ (gamma) rays are electromagnetic waves with very short wavelengths, that is, light. Most electromagnetic waves with wavelengths less than 10 pm (10-9 m) are called gamma rays. The properties of the X-rays and the wavelength region overlap with each other. Similarly, X-rays and gamma rays are not distinguished by the wavelength length, but by what causes them. Gamma rays refer to electromagnetic waves that emit energy generated when the nucleus of one element collapses and changes to another. X-rays refer to electromagnetic waves emitted by electrons in atoms other than the nucleus. When the nucleus inside the atom collapses, releasing alpha or beta rays, a very small amount of mass is lost, which is converted into large energy according to Einstein's equation E = mc2. This energy destabilizes the nucleus, which in turn returns to a stable state, giving off a large amount of electromagnetic waves.

The higher the energy, the shorter the wavelength, so gamma rays are emitted when the nucleus collapses. Gamma rays do not have ionization capabilities in themselves, but because of their high energy, they give energy by touching atoms or molecules in matter, causing ionization. This is manifested in phenomena such as the photoelectric effect and the Compton effect. It also dies, producing electrons and positrons (pairing). Conversely, when the electrons and positrons meet, gamma rays appear (double extinction). The ionization capacity itself is weaker than alpha or beta rays, but the penetration is so strong that the general radiation exposure is due to gamma rays. Although it can be blocked through dense materials such as concrete, iron, and lead, even the best shielding lead requires a thickness of about 10 cm.

Particle beams include neutron beams, proton beams, and cosmic rays. Electromagnetic waves, such as ultraviolet (UV) ultra violet, also cause ionization, but generally do not put ultraviolet light into radiation. X-rays are electromagnetic waves with a wavelength of 10-9m to 10-5m, and are generally longer and weaker than gamma rays. Proton and neutron beams do not occur when the nucleus collapses, but by artificial means such as nuclear reactors or particle accelerators. Protons have properties similar to alpha rays, and neutrons do not have charges, but because of their high kinetic energy, they produce gamma rays or emit protons, causing ionization. Cosmic rays refer to all radiations originating in the universe other than the Earth's origin, such as nuclear nuclei or nuclear reactors, and include muons, neutrinos, electrons, neutrons, and gamma rays.

Such radiation can occur in nuclear power plants, laboratories, hospitals, etc., which mainly deal with radiation in real life. Thus, a radiation shielding suit or a radiation absorbing suit using a material capable of safely shielding or absorbing radiation contamination of workers working under the conditions in which radiation occurs is used. However, such a shielding suit or absorbent suit is inconvenient for the user to use because it is not restored to its original state after bending or bending. Moreover, it is a reality that little radiation absorbing clothing or the like capable of absorbing radiation such as neutrons is usually developed. Accordingly, radiation absorbing clothing that can absorb neutron beams rather than gamma rays and shield neutron beams from an operator is preferable. In addition, when manufactured with a garment for the purpose of absorbing radiation, there is a fear that the stability is impaired due to the seams, the holes for forming the seams, or the like. In addition, it is preferable that lead or the like constituting the product does not fall or separate from the product.

Accordingly, an object of the present invention is to provide a neutron absorbing and gamma-ray shielding sheet, a garment made thereof, and a method of manufacturing the same, having flexibility and resilience excellent in flexibility and resilience.

In addition, another object of the present invention, the neutron beam absorption and gamma-ray shielding sheet which can simultaneously shield the radiation having a straightness and can absorb the radiation that does not have a straightness, and the garment made thereof It is to provide a manufacturing method.

Further, another object of the present invention is to provide a neutron absorbing and gamma-ray shielding sheet, a garment made thereof, and a method of manufacturing the same, which have more stability and flexibility and resilience.

In addition, another object of the present invention is to provide a neutron absorption and gamma-ray shielding sheet, a garment made thereof, and a method of manufacturing the same, having flexibility and resilience that is easy to use because no breakage, dropping or the like of the boron carbide powder occurs.

Further, another object of the present invention is to provide a neutron absorbing and gamma-ray shielding sheet, a garment made thereof, and a method of manufacturing the same, having flexibility and resilience, which can relatively improve the application range.

Further, another object of the present invention is to provide a neutron absorbing and gamma-ray shielding sheet, a garment made thereof, and a method of manufacturing the same, having flexibility and resiliency that can be easily detached.

The object is a neutron radiation absorbing sheet having a flexible and resilient sheet shape prepared by adding a powdered boron carbide and a composite to the powdered boron carbide; Gamma-ray shielding and neutron-ray absorption comprising: a gamma radiation shielding sheet having a flexible and resilient sheet shape, which is combined with the neutron radiation absorbing sheet and manufactured by adding a powdered lead and a compound to the powdered lead Achieved by sheet.

In addition, it is preferable that the composite contains an isocyanate ester polymer compound.

In addition, the content of the powdered boron carbide ranges from 55 to 60 wt%, the content of the powdered lead is 95 wt% or more, and the composite is an additive capable of forming at high density and high pressure by combining the powdered boron carbide and the polymer compound. It is preferable to further include.

On the other hand, an object of the present invention is also achieved by a flexible and resilient gamma ray shielding and neutron absorbing suit comprising a gamma ray shielding and a neutron absorbing sheet.

On the other hand, an object of the present invention is to provide a method for preparing a neutron beam, comprising: (a-1) mixing a powdered boron carbide and a composite to absorb neutron radiation; (a-2) molding at high pressure to form a sheet shape capable of absorbing high density neutron radiation; and (b-1) mixing powdered lead and the composite to shield gamma radiation; ; (b-2) molding to a high pressure to form a sheet shape capable of shielding high-density gamma radiation; and is also achieved by a method for producing a neutron absorbing and gamma-ray shielding sheet and its garment.

In addition, the composite includes an isocyanate ester polymer compound, the content of the powdered boron carbide is in the range of 55 ~ 60 wt%, the content of the powder lead is preferably 95 wt% or more.

In addition, the step of combining the neutron absorbing sheet through the step (a-2) and the gamma-ray shielding sheet through the step (b-2);

According to the present invention, it is more flexible and excellent in resilience, and may have a good wearing feeling when manufactured in clothing or the like.

In addition, it is possible not only to shield the radiation having straightness, but also have two functions simultaneously to absorb the radiation having no straightness.

In addition, a seam, a hole, or the like is not required, and thus stability may be improved.

In addition, the boron carbide or lead powder is not broken, falling and the like is convenient to use, can prevent the toxicity, such as lead, it is possible to improve the safety.

In addition, it can be produced by adjusting the content, strength, thickness, etc. of the shielding or absorbing material in response to the radiation dose, and can be used in a variety of applications, such as clothes, curtains, protective film, etc. can improve the scope of application.

In addition, in the case of radiation shielding clothing or absorbent clothing, it is open to the front and can be easily attached and detached as in general work clothes, so it is convenient to use.

1 (a) to 1 (d) is a schematic diagram for explaining a process for making a material of the neutron absorption and gamma-ray shielding sheet according to an embodiment of the present invention,
Figure 1 (e) is a cross-sectional view cut the material of the neutron absorption and gamma-ray shielding sheet according to the present invention,
Figure 1 (f) is a view showing the shape of the radiation absorbing clothing made using the neutron absorption and gamma-ray shielding sheet according to the present invention,
2 is a view showing a process diagram of the neutron absorption and gamma-ray shielding sheet according to the present invention.

Hereinafter, the present invention will be described in detail with reference to FIGS. 1 (a) to 2.

In particular, the neutron absorbing and gamma ray shielding sheet 100 according to the present invention is characterized in that it has a function of shielding the gamma rays having a straightness and the two functions of absorbing a neutron beam having no straightness among the aforementioned types of radiation. have.

In the mixing step (S310), as shown in FIGS. 1A and 2, powdered boron carbide, which is a main material, and a subsidiary material are mixed with the mixer 110 to generate a mixed material. In other words, this process is to make a radiation absorbing sheet. In this case, the mixing means may use various kinds of mixing means 110 including a mixer. However, since the boron carbide is used in a powder state, the mixing means 110 in a sealed structure is preferable so that harmful dust does not scatter. Here, the content of the powdered boron carbide is preferably in the range of 55 ~ 60 wt%. If it is lower than this ratio, the function which shields or absorbs radiation will fall. If it is higher than this ratio, the function of shielding or absorbing radiation is improved, but the economical efficiency will also be considered because boron carbide, a material used, is expensive. However, the neutron absorbing sheet 180 of the present invention does not exclude the content of powdered boron carbide of less than 55 wt% at 35 wt% or more. Hereinafter, reference numeral 140 may be used as a radiation shielding sheet in a narrow sense, or may be used according to the context in the sense of a material including a radiation absorbing sheet as well as a radiation shielding sheet in a broad sense.

On the other hand, in the mixing step (S310), as shown in Fig. 1 (a) to 2, the powdered lead and the subsidiary material as the main material is mixed with the mixer 110 or the like to generate a mixed material. That is, this process is a process of making the radiation shielding sheet 140. In this case, the mixing means may use various kinds of mixing means 110 including a mixer and the like. However, since lead is used in a powder state, a mixing means of a sealed structure is preferable to prevent harmful dust from scattering. Here, the content of the powdered lead is preferably 95 wt% or more. If it is lower than this ratio, the ability to shield radiation is poor. However, the present invention does not exclude the content of powdered lead of more than 80 wt% but less than 95 wt%.

In the following, the shielding rate to absorbance, in particular, that can shield or absorb gamma rays or neutron rays, depends on the mixing ratio of powdered lead or powdered boron carbide and the thickness of the plate-shaped material 140 according to the present invention. That is, the shielding rate or absorption rate of the powdered boron carbide is 35 wt% and the weight of 60 wt% in the same thickness of the material 140, and in the case of having the same powdered boron carbide ratio, the thicker the thickness, the higher the neutron The shielding rate or absorption rate of the radiation is increased. Boron carbide is a material that can absorb neutron beams that do not have straightness. In the present invention, the application of such boron in powder form is one feature. The powdered boron carbide used is preferably boron carbide made of a high purity powder having excellent shielding rate and absorption rate of neutron radiation.

Similarly, the shielding ratios of 80 wt% and 95 wt% of the powdered lead in the same thickness of the material 140 are different. In the case of having the same powdered lead, the thicker the thickness, the higher the shielding rate of the gamma radiation. Lead is a material capable of shielding gamma rays having straightness. In the present invention, the application of such lead in powder form is one feature. The powder lead used is preferably a high purity powder lead having excellent radiation shielding rate.

The material added to the powdered boron carbide or lead includes isocyanate ester polymer compounds. And the additive which can combine these mutually tightly is added. Thus, in the neutron absorption and gamma-ray shielding sheet 100 according to the present invention, not only the binding force of the boron carbide particles of the powder is very strong, but also high density can be achieved. Many experiments have shown that isocyanate ester high molecular compounds can achieve the binding strength and density of powdered boron carbide among various compounds. That is, as in most cases, the neutron absorption and the physical properties of the gamma-ray shielding sheet 100 may be different depending on the type of compound added.

In addition, the following molding step (S320) and curing step (S330) is commonly applied to the radiation shielding sheet 140 and the radiation absorbing sheet 180.

Molding step (S320), as shown in Figure 1 (b), Figure 1 (c) and Figure 2, for example, consists of a press operation having a mold of the lower mold 125 and the lower mold (123). For example, the raw material 130 mixed in the lower mold 125 provided in the lower portion of the press 120 is put, and the lower mold 123 provided in the upper portion of the press 120 is lowered to mix the raw materials of the lower mold 125. Press 130. In this case, the temperature of the raw material 130 to the material 140 is maintained between 45 ± 5 ° C., for example. If it is lower or higher than this temperature, molding is somewhat difficult when pressurized. In order to maintain such a temperature, the lower mold 123 or the lower mold 125 may include a heater (not shown).

Then, in the aging (curing) step (S330), as shown in Fig. 1 (c) and 2, by maintaining a pressurized state for a predetermined time at a constant temperature to mature the mixed material 140. That is, it may be different depending on the desired thickness, for example, if the product thickness 2mm, for example, the aging process in order to maintain the stability of the product by maintaining the temperature range of 20 ± 5 ℃ for about 10 ± 1 hour. Aging longer than this time does not improve the effect on aging, and if it is aged shorter than this time, the boron powder and the composite are not firmly bonded to each other, and densification is not achieved. There is a fear of causing the phenomenon to come off. In addition, when the time of this step elapses, the material 140 is hardened. That is, powder boron carbide to powder lead, a high molecular compound, an additive, etc. cause a mutual chemical reaction and stabilize. The material 140 that has undergone this step becomes a denser plate-shaped material 140.

The material 140 thus formed has much more flexibility and excellent resilience than the conventional radiation shielding or absorbing material.

According to various embodiments of the present disclosure, different times and temperatures may be applied when the contents of the powdered boron carbide and lead and the thickness of the product are different.

Finishing step (S340), as shown in Figure 1 (d) to 2, the process of finishing the material 140 separated from the lower mold 123 and the lower mold 125, radiation shielding sheet and radiation absorbing sheet A step of combining with each other, attaching the outer skin or the inner skin, sewing to fit the shape of the garment, and the step of making it into the shape required such as clothing and the like.

First, as shown in FIG. 1 (d), the upper mold 125 is separated from the lower mold 123, and the material 140 is separated from the lower mold 123. And although not shown in figure, the finishing operation which cleanly finishes the edge of the plate-shaped raw material 140 etc. isolate | separated from the lower mold | type 123 and the lower mold | type 125 is performed cleanly.

Next, as shown in FIG. 1 (e), the radiation shielding sheet 140 and the radiation absorbing sheet 180 are coupled to each other. As the adhesive for bonding the two sheets 140 and 180 to each other, it is preferable to use an isocyanate-based high molecular compound, which is one of the raw materials of both sheets 140 and 180. Thus, the component constituting the material 140 is also used as a binder has the advantage that the adhesion between the sheets 140, 180 can be much improved.

Next, as shown in Figure 1 (e), the inner or outer side of the material 140, as necessary, the endothelial 160 or the outer shell 150 is attached to the material 140 using a binder. In this process, it is preferable to use an isocyanate-based polymer compound constituting the component of the material 140 as a binding material for bonding the material 140 and the endothelial 160 or the outer shell 150. Therefore, the component constituting the material 140 can also be used as a binder can improve the adhesion even more.

Next, as shown in Figure 1 (f), the user is cut into a shape of a vest easy to wear, to make a radiation absorbing suit and shielding suit 100 of the required shape. On the other hand, since the plate-shaped material 140 is used to open the front so that there are no seams, holes, etc., it is preferable to fix the velcro tape by the coupling means 170. Therefore, the part which is not shielded can be eliminated through a conventional seam or a hole, and a radiation can be absorbed or shielded more efficiently.

That is, as shown in FIG. 1 (e), the radiation absorbing suit or the shielding suit according to the present invention can not only shield radiation such as gamma rays having straightness, but also absorb radiation such as neutron rays having no straightness. It is very convenient to have both functions at the same time. Here, the radiation absorbing sheet 180 may be located outside, or the radiation shielding sheet 140 may be located outside.

In addition, the Velcro tape 170 after wearing a radiation absorbing and shielding suit 100 made of neutron absorbing and gamma-ray shielding sheet 140 according to the present invention in the form of an open front as a conventional vest in one embodiment It is very convenient to use and is provided in the form of a single plate which does not require a seam or a hole, so that safety can be improved.

Although the above-described embodiment described the garment as an embodiment, the neutron-absorbing and gamma-ray shielding sheets 140 and 180 applied to the radiation-absorbing and shielding garment 100 according to the present invention generate radiation as well as clothing. It is also very effective when used for shielding or absorbing curtains of radiation rooms, and for protecting walls. That is, even when used in a structure such as a wall, it is possible to shield or absorb radiation very effectively.

Here, although various embodiments of the present invention have been illustrated and described, it will be apparent to those skilled in the art that the present embodiments may be modified without departing from the spirit or spirit of the present invention. will be. It is intended that the scope of the invention be defined by the claims appended hereto and their equivalents.

100 radiation absorbing and shielding suit 110 mixer, mixing means
120: Press 123: Pictograph
125: lower mold 130: mixed material, raw material
140: material, radiation shielding sheet 150: shell
160: endothelial 170: coupling means
180: radiation absorption sheet

Claims (7)

A neutron radiation absorbing sheet having a flexible and resilient sheet shape prepared by adding a powdered boron carbide and a composite to the powdered boron carbide;
Gamma-ray shielding and neutron-absorbing sheet coupled to the neutron radiation absorbing sheet, including a powdered lead and a gamma radiation shielding sheet having a flexible and resilient sheet shape prepared by adding a composite to the powdered lead . The method of claim 1,
The composite is gamma ray shielding and neutron absorbing sheet, characterized in that it comprises an isocyanate ester polymer compound. The method of claim 2,
The content of the powdered boron carbide ranges from 55 to 60 wt%,
The content of the powdered lead is in the range of 95 to 98.5 wt%,
The composite is gamma-ray shielding and neutron absorbing sheet, characterized in that further comprising an additive capable of forming a high density, high pressure by combining the powdered boron carbide and the polymer compound. A flexible and resilient gamma ray shielding and neutron absorbing suit comprising the gamma ray shielding and neutron absorbing sheet of claim 1. (a-1) mixing the powdered boron carbide with the composite to absorb neutron radiation;
(a-2) forming at a high pressure to form a sheet shape capable of absorbing high density neutron radiation; and
(b-1) mixing the powdered lead and the composite to shield gamma radiation;
(b-2) molding to a high pressure to form a sheet shape capable of shielding high-density gamma radiation; neutron absorption and gamma-ray shielding sheet manufacturing method comprising a. The method of claim 5,
The composite includes an isocyanate-based ester polymer compound,
The content of the powdered boron carbide is in the range of 55 to 60 wt%,
The content of the powder lead is 95 ~ 98.5 wt% The neutron absorption and gamma ray shielding sheet manufacturing method characterized in that the range. The method of claim 5,
The neutron absorbing sheet and the gamma-ray shielding sheet further comprising the step of: mutually coupling the neutron absorbing sheet through the step (a-2) and the gamma radiation shielding sheet through the step (b-2); Way.

Images