Radioisotope-based long-life glow stick and preparation method thereof

Abstract

The invention relates to a radioisotope-based long-service-life glow stick and a preparation method thereof.The glow stick comprises a fluorescent ceramic body, a packaging shell, a protection shell, a packaging air bag, a sharp object and radioisotope gas, and the packaging shell is arranged in the protection shell; a fluorescent ceramic body, a packaging air bag and a sharp object are arranged in the packaging shell, radioactive isotope gas is filled in the packaging air bag, and the fluorescent ceramic body, the packaging shell and the protective shell are made of transparent materials; when the fluorescent rod is used, the fluorescent rod is shaken up and down, the packaging air bag is broken under the combined action of the fluorescent ceramic body and the sharp object, and after the packaging air bag is broken, the radioactive isotope gas is diffused in the packaging shell, makes contact with the fluorescent ceramic body and excites the fluorescent ceramic body to emit light. Compared with the prior art, the glow stick prepared by the invention has the advantages of stable luminescence performance, small influence of environment temperature and long service life.

Description

Technical Field

[0001] The invention belongs to the technical field of radioisotope light sources and relates to a long-life fluorescent stick based on radioisotopes and a preparation method thereof. Background Art

[0002] Commercial fluorescent sticks are disposable chemiluminescent products that light up when used. They have the advantages of simple preparation, easy portability, diverse luminescent colors, and simple startup and use methods. They have been widely used in many fields such as entertainment, night fishing, weddings, outdoor activities, military, engineering construction, and underwater operations. The fluorescent sticks commonly seen on the market are strip-shaped, with an outer layer of polyethylene plastic packaging and an industrial product with a glass tube sandwich inside. The liquids inside and outside the sandwich are peroxide and ester compounds, respectively. The glass is broken by bending, hitting, and rubbing, causing the two compounds inside and outside to react, and then the energy after the reaction is transferred to the built-in fluorescent dye, causing the fluorescent dye to emit light.

[0003] At present, the effective luminous time of various types of fluorescent sticks is 30s-48h. Moreover, the length of the luminous time of fluorescent sticks is inversely proportional to the ambient temperature (that is, the higher the ambient temperature, the shorter the luminous time of the fluorescent stick), and is also inversely proportional to the initial brightness of the fluorescent stick (that is, the higher the brightness of the fluorescent stick when it is just folded, the shorter the luminous time). Therefore, in order to extend the luminous time, the fluorescent sticks that have been lit are often placed in a low temperature environment (such as a refrigerator or freezer) to inhibit the chemical reaction of the two liquids in the fluorescent sticks. When needed, they can be taken out and continued to be used.

[0004] Generally speaking, existing fluorescent sticks have a short luminous time and are greatly affected by the ambient temperature, making it difficult to meet the lighting needs of certain special places and scenes.

[0005] Patent CN212204062U discloses a motion-stimulated fluorescent stick and device, which includes: a light-transmitting shell and stress-luminescent beads, wherein the light-transmitting shell is provided with an inner cavity, and the stress-luminescent beads are arranged in the inner cavity, and the stress-luminescent beads are bead-shaped particles containing stress-luminescent materials inside or on the surface. However, this patent aims to solve the shortcomings of conventional fluorescent sticks that their fluorescent brightness does not change under external stimulation, such as shaking, squeezing, knocking and other external forces, and even if the fluorescent material used is added with long afterglow luminescent powder, its luminescence duration is still intermittent under the action of external stress, and it cannot achieve long-term stable luminescence; in addition, this patent does not solve the impact of ambient temperature changes on the brightness change of fluorescent sticks. Summary of the invention

[0006] The purpose of the present invention is to overcome at least one defect of the above-mentioned prior art and provide a long-life fluorescent stick based on radioactive isotopes and a preparation method thereof. The present invention prepares a fluorescent stick with stable luminous performance, little influence by ambient temperature and long life.

[0007] The purpose of the present invention can be achieved by the following technical solutions:

[0008] One of the technical solutions of the present invention is to provide a long-life fluorescent stick based on radioactive isotopes, the fluorescent stick comprising a fluorescent ceramic body, a packaging shell, a protective shell, a packaging airbag, a sharp object and radioactive isotope gas, wherein the protective shell is provided with a packaging shell, the packaging shell is provided with a fluorescent ceramic body, a packaging airbag and a sharp object, the packaging airbag is filled with radioactive isotope gas, and the fluorescent ceramic body, the packaging shell and the protective shell are made of transparent materials;

[0009] When in use, the fluorescent stick is shaken up and down, and the encapsulated airbag is broken under the combined action of the fluorescent ceramic body and the sharp object. After the encapsulated airbag is broken, the radioactive isotope gas diffuses in the encapsulated shell, fully contacts the fluorescent ceramic body, and releases β particles to excite the fluorescent ceramic body to emit light;

[0010] The packaging shell is in a vacuum state, which is used to contain the radioactive isotope gas and the fluorescent ceramic body, so that the two are in full contact, and play a role in preventing gas leakage and providing a certain shielding effect;

[0011] The protective shell mainly plays an anti-impact protection role and can provide different shapes and styles;

[0012] The sharp objects are used to help break up the fragile packaging airbag.

[0013] Furthermore, the material of the fluorescent ceramic body includes yellow fluorescent Y3Al5O 12 :Ce 3+ (YAG:Ce 3+ ) Ce-doped YAG, green fluorescent Lu3Al5O 12 :Ce 3+ (LuAG:Ce 3+ , cerium-doped lutetium aluminum garnet), blue fluorescent BaMgAl 10 O 17 :Eu 2+ (BAM:Eu 2+ , europium-doped barium magnesium aluminate), yellow fluorescent Sr 2.53 Ba 0.47 AlO4F:Ce 3+ (SBAOF:Ce 3 + , cerium-doped barium strontium fluoroaluminate) or red fluorescent Lu3Al5O 12 :Mn 4+ (LuAG:Mn 4+ , manganese-doped lutetium aluminum garnet), select according to the color of the fluorescent stick you need;

[0014] The material for packaging the airbag is glass;

[0015] The material of the sharp object includes a light alloy aluminum-lithium alloy or a magnesium-lithium alloy;

[0016] The radioisotope gas includes 3 H tritium or 85 Kr Krypton isotope gas.

[0017] As a preferred technical solution, the required raw materials and sintering aids are weighed according to the chemical formula, and the fluorescent ceramic body is prepared through ball milling, drying, grinding, screening, high-temperature calcination, molding, cold isostatic pressing, high-temperature sintering, heat treatment and surface treatment.

[0018] As a preferred technical solution, a high-temperature solid-phase method is used to synthesize phosphor powder, which requires strict control of the proportion of each raw material and the amount of sintering aid.

[0019] As a preferred technical solution, high-temperature calcination of the phosphor is used to remove organic impurities contained therein, the temperature is 750-850°C, and the time is 2-4h;

[0020] After cold isostatic pressing, it needs to be calcined again at 750-850℃ to remove impurities for 2-4h.

[0021] As a preferred technical solution, the high temperature sintering temperature varies according to the fluorescent ceramic used, which can be 1500-1800°C, and the time is 4-6h, and it needs to be sintered in different atmospheres, including vacuum conditions, hydrogen atmosphere, air atmosphere or oxygen atmosphere.

[0022] As a preferred technical solution, the vacuum condition is an absolute pressure of 5-10Pa.

[0023] As a preferred technical solution, after high-temperature sintering, the fluorescent ceramic body is subjected to high-temperature annealing oxidation treatment in an air atmosphere or an oxygen atmosphere at a temperature of 1200-1600° C. for 4-6 hours.

[0024] As a preferred technical solution, polishing is performed according to the transparency of the fluorescent ceramic body.

[0025] As a preferred technical solution, the three-dimensional shapes of the fluorescent ceramic body, packaging shell, protective shell and packaging airbag are selected from one or more of columnar and cylindrical shapes, and the cross-sectional shapes are selected from one or more of circular, triangular, square and polygonal shapes. The cross-sectional shapes of the packaging shell, protective shell and packaging airbag can be changed accordingly according to the different fluorescent ceramic bodies and usage scenarios.

[0026] As a preferred technical solution, both ends of the packaging airbag are sealed, one end is sealed after filling with gas, and the other end is a flat surface to contact with sharp objects.

[0027] As a preferred technical solution, the three-dimensional shape of the sharp object includes a tetrahedron, a pentahedron or a hexahedron.

[0028] Furthermore, the outer diameter of the fluorescent ceramic body is slightly smaller than the inner diameter of the packaging shell, the outer wall and the inner wall of the packaging shell maintain a gap of 0.5-1 mm, and the length is not less than 1 / 2 of the length of the packaging shell;

[0029] The thickness of the packaging airbag is 0.5-1.5mm, the outer diameter is slightly smaller than the inner diameter of the packaging shell, the outer wall and the inner wall of the packaging shell maintain a gap of 0.5-1mm, and the length meets the following requirements: when the sharp object, the packaging airbag and the fluorescent ceramic body are sequentially loaded into the packaging shell, the sum of the lengths of the three has a gap of 5-10mm with the two end seals of the packaging shell in the axial direction;

[0030] The minimum side length of the sharp object is not less than 1 / 2 of the inner diameter of the packaging shell;

[0031] After shaking the fluorescent stick, the encapsulated air bag is broken under the combined action of the fluorescent ceramic body and the sharp object.

[0032] Furthermore, the material of the packaging shell is high borosilicate glass, which has high visible light transparency (visible light transmittance can reach 92%), high tensile strength (40-120N / mm 2 ), low melting point (820°C), small thermal expansion coefficient (3.3×10 -6 / K, 20-300℃), good heat resistance (270℃ temperature difference) and radiation resistance, which can ensure the sealing of radioisotope gas and the emission of emitted light;

[0033] The material of the protective shell includes polycarbonate or acrylonitrile-butadiene-styrene copolymer (ABS) resin. The polycarbonate is highly transparent to visible light and has high impact resistance (300 times that of ordinary glass). It can provide protection for the internal packaging shell while having good light transmittance (visible light transmittance can reach 91%). The acrylonitrile-butadiene-styrene copolymer resin has excellent impact resistance, good low-temperature performance, good dimensional stability, good surface gloss, and is easy to color.

[0034] As a preferred technical solution, the packaging shell is tightly fitted with the protective shell to ensure that the packaging shell is not easily broken by the combined action of the fluorescent ceramic body and sharp objects after shaking the fluorescent stick.

[0035] Furthermore, the sharp object is arranged at the bottom of the protective shell, the packaging airbag is arranged above the sharp object, and the fluorescent ceramic body is arranged above the packaging airbag.

[0036] Furthermore, the protective shell is provided with a hook and / or a handle, and the fluorescent stick is hung by the hook, or is held by hand or inserted into the surface of an object and fixed, so as to play a lighting role.

[0037] As a preferred technical solution, the hook is integrally formed with the protective shell.

[0038] As a preferred technical solution, a hole is provided on the hook, a rope is passed through the hole, and the fluorescent stick is hung through the hole or the rope on the hook to play a lighting role.

[0039] As a preferred technical solution, the handle is integrally formed with the protective shell, or, depending on usage requirements, the handle is made of titanium alloy or stainless steel and is connected to the protective shell by means of threads or a jacket.

[0040] One of the technical solutions of the present invention is to provide a method for preparing the long-life fluorescent stick based on radioactive isotopes, the method comprising the following steps:

[0041] S1. Install the encapsulated airbag into the heating device, connect the open end of the encapsulated airbag to the air source device and the vacuum device, evacuate and heat at the same time, and after reaching the vacuum degree, keep the temperature constant and cool naturally to room temperature;

[0042] S2. Turn on the gas source device of the radioisotope gas, fill the radioisotope gas into the packaging air bag, and turn off the gas source device after the pressure stabilizes;

[0043] S3, using sealing and cutting equipment to seal and cut the packaged airbag;

[0044] S4, installing the sharp object, the packaging airbag, and the fluorescent ceramic body into the packaging shell in sequence;

[0045] S5, evacuate the packaging shell to a vacuum degree, and then perform the sealing and cutting of step S3;

[0046] S6. Assemble a protective shell outside the packaging shell to obtain a long-life fluorescent stick based on radioactive isotopes.

[0047] Furthermore, in step S1, the heating temperature is 100-300° C., the vacuum degree of the vacuum pumping is 1-10 Pa absolute pressure, and the constant temperature time is 1-2 hours, so as to ensure that the air in the packaging airbag is removed.

[0048] Furthermore, the filling pressure of the radioisotope gas in step S2 is 100-300 kPa. By controlling the filling pressure of the radioisotope gas, the luminous performance of the fluorescent stick can be adjusted.

[0049] As a preferred technical solution, the sealing and cutting equipment in step S3 includes hydrogen-oxygen flame sealing and cutting equipment or carbon dioxide mid-infrared laser sealing and cutting equipment.

[0050] Furthermore, the vacuum degree of the vacuum pumping in step S5 is 1-2 kPa absolute pressure, ensuring that the air in the packaging shell is removed.

[0051] As a preferred technical solution, when the material of the protective shell in step S4 is polycarbonate or acrylonitrile-butadiene-styrene copolymer resin, a pre-designed snap-on part is made using a mold (the mold is designed in advance based on the assembled packaging shell), and then assembled with the packaging shell and accessories.

[0052] One of the technical solutions of the present invention is to provide a preparation system for long-life fluorescent sticks based on radioactive isotopes, and the system is used to implement the method described, including heating equipment, gas source equipment, vacuum equipment and sealing and cutting equipment. The object is installed in the heating equipment, and the gas source equipment and the vacuum equipment are connected by connecting ferrules and pipelines. The sealing and cutting equipment seals and cuts the object.

[0053] Compared with the prior art, the present invention has the following beneficial effects:

[0054] (1) The present invention has made innovations in the structural design of the fluorescent stick, and uses radioactive gas isotopes as long-term excitation sources. The excitation ability of the excitation source on the fluorescent material depends on the decay characteristics of the isotopes themselves, is not affected by the external environment, and can provide continuous and stable excitation energy; and a transparent fluorescent ceramic body with good radiation resistance is used as the luminescent material. The combined effect of the two can significantly increase the luminescence time of the fluorescent stick, and the luminescence performance is stable, is less affected by the ambient temperature, and has a long life.

[0055] (2) The present invention can select fluorescent ceramic bodies with different fluorescent colors, and can prepare light sources with different fluorescent colors and shapes according to needs. When in use, the fluorescent stick is shaken up and down, and the encapsulated air bag is broken under the combined action of the fluorescent ceramic body and the sharp object, so that the radioactive isotope gas contacts the fluorescent ceramic body and excites the light emission. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 This is a schematic structural diagram of a long-life fluorescent stick based on radioactive isotopes in Example 1 of the present invention;

[0057] Figure 2 This is a schematic structural diagram of a long-life fluorescent stick based on radioactive isotopes in Example 2 of the present invention;

[0058] Figure 3 This is a schematic structural diagram of a long-life fluorescent stick based on radioactive isotopes in Example 3 of the present invention;

[0059] Figure 4 Schematic diagram of the structure of a device for preparing a long-life fluorescent stick based on radioactive isotopes in an embodiment of the present invention.

[0060] Description of the markings in the figure:

[0061] 1—fluorescent ceramic body, 2—packaging shell, 3—protective shell, 4—packaging airbag, 5—sharp object, 6—hook, 7—handle, 8—heating equipment, 9—gas source equipment, 10—sealing and cutting equipment. DETAILED DESCRIPTION

[0062] The present invention is described in detail below in conjunction with specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and a specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0063] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", "third", etc. are used to describe common objects, which only refer to different instances of the same object, and are not intended to imply that the objects described in this way must adopt a given order, whether in time, space, order or any other way.

[0064] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0065] Unless otherwise specified, the equipment used in the following examples are conventional equipment in the art; the reagents used are commercially available products or prepared by conventional methods in the art or methods described in public literature unless otherwise specified. Anything not described in detail in the following examples can be achieved by conventional experimental means in the art.

[0066] Embodiment 1:

[0067] A long-lived fluorescent stick based on a radioactive isotope, such as Figure 1 As shown, it includes a fluorescent ceramic body 1, a packaging shell 2, a protective shell 3, a packaging airbag 4, a sharp object 5 and a radioactive isotope gas. The protective shell 3 is provided with the packaging shell 2, and the packaging shell 2 is provided with the fluorescent ceramic body 1, the packaging airbag 4 and the sharp object 5. The packaging airbag 4 is filled with radioactive isotope gas. The fluorescent ceramic body 1, the packaging shell 2 and the protective shell 3 are made of transparent materials;

[0068] When in use, the fluorescent stick is shaken up and down, and the packaging airbag 4 is broken under the combined action of the fluorescent ceramic body 1 and the sharp object 5. After the packaging airbag 4 is broken, the radioactive isotope gas diffuses in the packaging shell 2, fully contacts with the fluorescent ceramic body 1, and releases β particles to excite the fluorescent ceramic body 1 to emit light;

[0069] The packaging shell 2 is in a vacuum state, and is used to contain the radioisotope gas and the fluorescent ceramic body 1, so that the two are in full contact, and to prevent gas leakage and provide a certain shielding effect;

[0070] The protective shell 3 mainly plays the role of anti-impact protection and can be provided in different shapes and styles;

[0071] The sharp object 5 is used to help break the fragile packaging airbag 4;

[0072] The sharp object 5 is arranged at the bottom of the protective shell 3, the encapsulating air bag 4 is arranged above the sharp object 5, and the fluorescent ceramic body 1 is arranged above the encapsulating air bag 4;

[0073] A hook 6 is provided on the protective shell 3, and the hook 6 is integrally formed with the protective shell 3;

[0074] The hook 6 may also be provided with a hole, in which a rope is inserted, and the fluorescent stick may be hung through the hook 6 or the hole or rope on the hook 6 to play a lighting role;

[0075] The material of the fluorescent ceramic body 1 can be Y3Al5O 12 :Ce 3+ (YAG:Ce 3+ , cerium-doped yttrium aluminum garnet), green fluorescent Lu3Al5O 12 :Ce 3+ (LuAG:Ce 3+ , cerium-doped lutetium aluminum garnet), blue fluorescent BaMgAl 10 O 17 :Eu 2+ (BAM:Eu 2+ , europium-doped barium magnesium aluminate), yellow fluorescent Sr2.53 Ba 0.47 AlO4F:Ce 3+ (SBAOF:Ce 3+ , cerium-doped barium strontium fluoroaluminate) or red fluorescent Lu3Al5O 12 :Mn 4+ (LuAG:Mn 4+ , manganese-doped lutetium aluminum garnet), which is selected according to the color of the fluorescent stick required. In this embodiment, yellow fluorescent YAG:Ce 3+ ;

[0076] The required raw materials and sintering aids are weighed according to the chemical formula, and the fluorescent ceramic body 1 is prepared through ball milling, drying, grinding, screening, high-temperature calcination, molding, cold isostatic pressing, high-temperature sintering, heat treatment and surface treatment;

[0077] The high-temperature solid-phase method is used to synthesize the phosphor, which requires strict control of the proportion of each raw material and the amount of sintering aids;

[0078] The high temperature calcination of the phosphor is used to remove the organic impurities contained in it, the temperature is 800℃, and the time is 3h;

[0079] After cold isostatic pressing, it needs to be calcined again at 800℃ for 3h to remove impurities;

[0080] The temperature of high temperature sintering varies according to the fluorescent ceramic body 1 used, and can be 1500-1800° C., preferably 1650° C. in this embodiment, and the time is 4-6 hours, preferably 5 hours in this embodiment, and the sintering needs to be performed under different atmospheres, such as vacuum conditions, hydrogen atmosphere, air atmosphere or oxygen atmosphere, preferably vacuum conditions and absolute pressure of 5-10 Pa in this embodiment, and more preferably absolute pressure of 8 Pa in this embodiment;

[0081] After high-temperature sintering, the fluorescent ceramic body 1 is subjected to high-temperature annealing oxidation treatment, which can be carried out in an air atmosphere or an oxygen atmosphere at a temperature of 1200-1600° C. for 4-6 hours. In this embodiment, it is preferably annealed at 1400° C. in an air atmosphere for 5 hours.

[0082] Finally, polishing is performed according to the transparency of the fluorescent ceramic body 1;

[0083] The three-dimensional shape of the fluorescent ceramic body 1 can be columnar or cylindrical, and the cross-sectional shape can be circular, triangular, square or polygonal. In this embodiment, it is preferably cylindrical. The three-dimensional shape of the packaging shell 2 and the protective shell 3 is cylindrical. The cross-sectional shape can be changed according to the different fluorescent ceramic body 1 and the usage scene. In this embodiment, it is preferably cylindrical.

[0084] The outer diameter of the fluorescent ceramic body 1 is slightly smaller than the inner diameter of the packaging shell 2, and the outer wall maintains a gap of 0.5-1mm with the inner wall of the packaging shell 2 in the radial direction, preferably 0.8mm in this embodiment, and the length is not less than 1 / 2 of the length of the packaging shell 2, preferably 3 / 5 in this embodiment, so that the packaging airbag 4 can be broken by the combined action of the fluorescent ceramic body 1 and the sharp object 5 after shaking the fluorescent stick;

[0085] The material of the packaging shell 2 is high borosilicate glass, which has high visible light transparency (visible light transmittance can reach 92%) and high tensile strength (40-120N / mm 2 ), low melting point (820°C), small thermal expansion coefficient (3.3×10 -6 / K, 20-300℃), good heat resistance (270℃ temperature difference) and radiation resistance, which can ensure the sealing of radioisotope gas and the emission of emitted light;

[0086] The packaging shell 2 is tightly fitted with the protective shell 3 in the radial and axial directions, ensuring that the packaging shell 2 is not easily broken by the combined action of the fluorescent ceramic body 1 and the sharp object 5 after the fluorescent stick is shaken;

[0087] The material of the protective shell 3 can be polycarbonate or acrylonitrile-butadiene-styrene copolymer (ABS) resin. Polycarbonate is highly transparent to visible light and has high impact resistance (300 times that of ordinary glass). It can provide protection to the internal packaging shell 2 while having good light transmittance (visible light transmittance can reach 91%). ABS resin has excellent impact resistance, good low temperature performance, good dimensional stability, good surface gloss, and easy coloring. In this embodiment, polycarbonate is preferably used;

[0088] The outer diameter of the protective shell 3 is 10-50 mm, preferably 20 mm in this embodiment, the thickness is 1-3 mm, preferably 2 mm in this embodiment, and the main body length is 100-500 mm (excluding the hook 6 or the handle 7), preferably 200 mm in this embodiment;

[0089] The material for packaging the airbag 4 is ordinary thin-walled glass;

[0090] The three-dimensional shape of the packaging airbag 4 is a flat cylinder with two sealed ends, one end of which is sealed after filling with gas, and the other end is a plane, which contacts the sharp object 5. The cross-sectional shape can be changed according to the different fluorescent ceramic body 1 and the use scene. In this embodiment, it is preferably a flat cylinder with two sealed ends;

[0091] The thickness of the packaging airbag 4 is 0.5-1.5mm, preferably 1mm in this embodiment, the outer diameter is slightly smaller than the inner diameter of the packaging shell 2, and the outer wall maintains a gap of 0.5-1mm with the inner wall of the packaging shell 2 in the radial direction, preferably 0.8mm in this embodiment, and the length satisfies: when the sharp object 5, the packaging airbag 4 and the fluorescent ceramic body 1 are sequentially loaded into the packaging shell 2, the sum of the lengths of the three has a gap of 5-10mm with the two end seals of the packaging shell 2 in the axial direction, preferably 8mm in this embodiment, so that the packaging airbag 4 is easy to be broken by the combined action of the fluorescent ceramic body 1 and the sharp object 5 after shaking the fluorescent stick;

[0092] The material of the sharp object 5 can be a light alloy aluminum-lithium alloy or magnesium-lithium alloy, and aluminum-lithium alloy is preferred in this embodiment;

[0093] The three-dimensional shape of the sharp object 5 can be a tetrahedron, a pentahedron or a hexahedron, and in this embodiment, a regular tetrahedron is preferred;

[0094] The minimum side length of the sharp object 5 is not less than 1 / 2 of the inner diameter of the packaging shell 2, and is preferably 3 / 5 in this embodiment, so that the packaging airbag 4 can be broken by the combined action of the fluorescent ceramic body 1 and the sharp object 5 after shaking the fluorescent stick;

[0095] Radioisotope gases can be 3 H tritium or 85 Kr krypton isotope gas, preferably 85 Kr gas.

[0096] The preparation method of the long-life fluorescent stick based on radioactive isotope is as follows: Figure 4 As shown, the specific steps are as follows:

[0097] S1. Install the packaging airbag 4 into the heating device 8, connect the open end of the packaging airbag 4 to the gas source device 7 and the vacuum device, and heat to 100-300°C while evacuating, preferably 200°C in this embodiment, and after reaching a vacuum degree of 1-10Pa absolute pressure, preferably 5Pa absolute pressure in this embodiment, keep the temperature constant for 1-2h, preferably 1.5h in this embodiment, and naturally cool to room temperature to ensure that the air in the packaging airbag 4 is removed;

[0098] S2, open the gas source device 9 of the radioisotope gas, fill the radioisotope gas into the packaging airbag 4, the filling pressure of the radioisotope gas is 100-300 kPa, preferably 100 kPa in this embodiment, close the gas source device 9 after the pressure stabilizes, and by controlling the filling pressure of the radioisotope gas, the luminous performance of the fluorescent stick can be adjusted;

[0099] S3, using the sealing and cutting device 10 to seal and cut the packaged airbag 4, the sealing and cutting device 8 can be a hydrogen-oxygen flame sealing and cutting device or a carbon dioxide mid-infrared laser sealing and cutting device, and in this embodiment, the hydrogen-oxygen flame sealing and cutting device is preferably used;

[0100] S4, installing the sharp object 5, the packaging airbag 4, and the fluorescent ceramic body 1 into the packaging shell 2 in sequence;

[0101] S5, evacuate the packaging shell 2 to reach a vacuum degree of 1-2 kPa absolute pressure, preferably 1 kPa absolute pressure in this embodiment, and perform sealing and cutting in step S3 to ensure that the air in the packaging shell 2 is removed;

[0102] S6. Assemble the protective shell 3 outside the packaging shell 2 to obtain a long-life fluorescent stick based on radioactive isotopes. If the material of the protective shell 3 is polycarbonate or ABS resin, a pre-designed snap-on part can be made into a mold (the mold is designed in advance based on the assembled packaging shell 2), and then assembled with the packaging shell 2 and accessories. In this embodiment, polycarbonate is preferred.

[0103] A preparation system for long-life fluorescent sticks based on radioactive isotopes, the system is used to implement the above method, including a heating device 8, an air source device 9, a vacuum device and a sealing and cutting device 10, the object is installed in the heating device 8, the air source device 9 and the vacuum device are connected by connecting ferrules and pipelines, and the sealing and cutting device 10 seals and cuts the object.

[0104] In Example 1, the luminous intensity of the fluorescent stick in the temperature range of -50 to 70°C for 48 hours has a change value of less than 10%; in the temperature range of 25 to 70°C for 48 hours, the luminous intensity change value is less than 1.2%. After the fluorescent stick is prepared, the room temperature brightness decay test is carried out at 3 months, 6 months and 9 months respectively, and the test is in accordance with 85 The decay law of Kr krypton isotope gas, that is, the brightness change satisfies the formula Lr = e -(2.043E-9 / s)×t , where Lr is the relative brightness, t is the time from the preparation of the fluorescent stick to the measurement of the brightness, in seconds, which means that its brightness is not less than 50% of the initial brightness value within 5 years.

[0105] Embodiment 2:

[0106] A long-life fluorescent stick based on radioactive isotopes and a preparation method thereof, such as Figure 2As shown, it is basically the same as Example 1, except that the protective shell 3 is not provided with a hook 6, but is provided with a handle 7, and the handle 7 and the protective shell 3 can be integrally formed, or according to the use requirements, the material of the handle 7 can be titanium alloy or stainless steel, preferably titanium alloy in this embodiment, and connected to the protective shell 3 by thread or jacket, preferably threaded connection in this embodiment, the fluorescent stick can be held by hand or inserted into the surface of an object to be fixed, so as to play a lighting role;

[0107] The material of the fluorescent ceramic body 1 is red fluorescent LuAG:Mn 4+ ;

[0108] The high temperature sintering temperature of the fluorescent ceramic body 1 is 1750°C, the time is 5 hours, and it needs to be sintered under vacuum conditions and an absolute pressure of 8Pa;

[0109] After high-temperature sintering, the fluorescent ceramic body 1 is annealed at 1500° C. in an oxygen atmosphere for 5 h;

[0110] The main body length of the protective shell 3 is 100 mm, and the length of the handle 7 is 50 mm.

[0111] The method for preparing the long-life fluorescent stick based on radioactive isotopes is basically the same as that in Example 1, except that in step S1, the vacuum is evacuated while heating to 100° C., and after reaching a vacuum degree of 10 Pa absolute pressure, the temperature is kept constant for 2 hours;

[0112] The filling pressure of the radioisotope gas in step S2 is 200 kPa;

[0113] In step S5, a vacuum degree of 1.5 kPa absolute pressure is achieved.

[0114] In Example 2, the luminous intensity of the fluorescent stick in the temperature range of -50 to 70°C for 48 hours has a change value of less than 10%; in the temperature range of 25 to 70°C for 48 hours, the luminous intensity change value is less than 5.1%. After the fluorescent stick is prepared, the room temperature brightness decay test is carried out at 3 months, 6 months and 9 months respectively, and the test meets the requirements. 85 The decay law of Kr krypton isotope gas, that is, the brightness change satisfies the formula Lr = e -(2.043E-9 / s)×t , where Lr is the relative brightness, t is the time from the preparation of the fluorescent stick to the measurement of the brightness, in seconds, which means that its brightness is not less than 50% of the initial brightness value within 5 years.

[0115] Embodiment 3:

[0116] A long-lived fluorescent stick based on a radioactive isotope, such as Figure 3As shown, it is basically the same as Example 2, except that a hook 6 and a handle 7 are provided on the protective shell 3, and the hook 6 and the handle 7 are integrally formed with the protective shell 3. The fluorescent stick can be hung by the hook 6, or can be held or inserted into the surface of an object to be fixed, so as to play a lighting role;

[0117] The material of the fluorescent ceramic body 1 is green fluorescent LuAG:Ce 3+ ;

[0118] The high temperature sintering temperature of the fluorescent ceramic body 1 is 1700°C, the time is 5 hours, and it needs to be sintered under vacuum conditions and an absolute pressure of 8Pa;

[0119] After high-temperature sintering, the fluorescent ceramic body 1 is annealed at 1400° C. in an air atmosphere for 5 h;

[0120] The material of the protective shell 3 is ABS resin.

[0121] The method for preparing the long-life fluorescent stick based on radioactive isotopes is basically the same as that of Example 2, except that in step S1, the temperature is kept constant for 1 hour while heating to 300° C. while evacuating the vacuum to an absolute pressure of 1 Pa;

[0122] The filling pressure of the radioisotope gas in step S2 is 300 kPa;

[0123] In step S5, a vacuum degree of 2 kPa absolute pressure is achieved.

[0124] In Example 3, the luminous intensity of the fluorescent stick in the temperature range of -50 to 70°C for 48 hours has a change value of less than 10%; in the temperature range of 25 to 70°C for 48 hours, the luminous intensity change value is less than 4.2%. After the fluorescent stick is prepared, the room temperature brightness decay test is carried out at 3 months, 6 months and 9 months respectively, and the results meet the requirements. 85 The decay law of Kr krypton isotope gas, that is, the brightness change satisfies the formula Lr = e -(2.043E-9 / s)×t , where Lr is the relative brightness, t is the time from the preparation of the fluorescent stick to the measurement of the brightness, in seconds, which means that its brightness is not less than 50% of the initial brightness value within 5 years.

[0125] The above description of the embodiments is to facilitate the understanding and use of the invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. A long-lived fluorescent stick based on radioactive isotopes, It is characterized in that The fluorescent stick comprises a fluorescent ceramic body (1), a packaging shell (2), a protective shell (3), a packaging airbag (4), a sharp object (5) and a radioactive isotope gas; the packaging shell (2) is arranged inside the protective shell (3); the fluorescent ceramic body (1), the packaging airbag (4) and the sharp object (5) are arranged inside the packaging shell (2); the packaging airbag (4) is filled with radioactive isotope gas; and the fluorescent ceramic body (1), the packaging shell (2) and the protective shell (3) are made of transparent materials; When in use, the fluorescent stick is shaken up and down, and the packaging airbag (4) is broken under the combined action of the fluorescent ceramic body (1) and the sharp object (5). After the packaging airbag (4) is broken, the radioactive isotope gas diffuses in the packaging shell (2), contacts the fluorescent ceramic body (1), and excites the fluorescent ceramic body (1) to emit light.

2. A long-life fluorescent stick based on radioactive isotopes according to claim 1, It is characterized in that The material of the fluorescent ceramic body (1) includes Y 3 Al 5 O 12 :Ce 3+ 、Lu 3 Al 5 O 12 :Ce 3+ 、BaMgAl 10 O 17 :Eu 2+ , Sr 2.53 Ba 0.47 AlO 4 F:Ce 3+ or Lu 3 Al 5 O 12 :Mn 4+ ; The material of the packaging airbag (4) is glass; The material of the sharp object (5) includes aluminum-lithium alloy or magnesium-lithium alloy; The radioisotope gas includes 3 H or 85 Kr gas.

3. A long-life fluorescent stick based on radioactive isotopes according to claim 1, It is characterized in that The outer wall of the fluorescent ceramic body (1) and the inner wall of the packaging shell (2) maintain a gap of 0.5-1 mm, and the length is not less than 1 / 2 of the length of the packaging shell (2); The thickness of the packaging airbag (4) is 0.5-1.5 mm, and a gap of 0.5-1 mm is maintained between the outer wall and the inner wall of the packaging shell (2). The length satisfies that when the sharp object (5), the packaging airbag (4) and the fluorescent ceramic body (1) are sequentially loaded into the packaging shell (2), the sum of the lengths of the three has a gap of 5-10 mm with the two end seals of the packaging shell (2) in the axial direction; The minimum side length of the sharp object (5) is not less than 1 / 2 of the inner diameter of the packaging shell (2).

4. A long-life fluorescent stick based on radioactive isotopes according to claim 1, It is characterized in that The packaging shell (2) is made of high borosilicate glass; The material of the protective shell (3) includes polycarbonate or acrylonitrile-butadiene-styrene copolymer resin.

5. A long-life fluorescent stick based on radioactive isotopes according to claim 1, It is characterized in that The sharp object (5) is arranged at the bottom of the protective shell (3), the packaging airbag (4) is arranged above the sharp object (5), and the fluorescent ceramic body (1) is arranged above the packaging airbag (4).

6. A long-life fluorescent stick based on radioactive isotopes according to claim 1, It is characterized in that The protective shell (3) is provided with a hook (6) and / or a handle (7).

7. A method for preparing a long-life fluorescent stick based on a radioactive isotope as claimed in any one of claims 1 to 6, It is characterized in that The method comprises the following steps: S1, install the packaging airbag (4) into the heating device (8), connect the open end of the packaging airbag (4) to the air source device (9) and the vacuum device, evacuate and heat at the same time, and after reaching the vacuum degree, keep the temperature constant and cool naturally to room temperature; S2, opening the gas source device (9) of the radioactive isotope gas, filling the radioactive isotope gas into the packaging air bag (4), and closing the gas source device (9) after the pressure is stabilized; S3, using a sealing and cutting device (10) to seal and cut the packaging airbag (4); S4, installing the sharp object (5), the packaging airbag (4), and the fluorescent ceramic body (1) into the packaging shell (2) in sequence; S5, evacuating the packaging shell (2) to a vacuum degree, and then performing the sealing and cutting of step S3; S6. Assembling the protective shell (3) outside the packaging shell (2) to obtain a long-life fluorescent stick based on radioactive isotopes.

8. The method for preparing a long-life fluorescent stick based on radioactive isotopes according to claim 7, It is characterized in that In step S1, the heating temperature is 100-300° C., the vacuum degree of the evacuation is 1-10 Pa absolute pressure, and the constant temperature time is 1-2 h.

9. The method for preparing a long-life fluorescent stick based on radioactive isotopes according to claim 7, It is characterized in that The filling pressure of the radioisotope gas in step S2 is 100-300 kPa.

10. The method for preparing a long-life fluorescent stick based on radioactive isotopes according to claim 7, It is characterized in that The vacuum degree of the evacuation in step S5 is 1-2 kPa absolute pressure.

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