A high-resolution cold neutron imaging material and its preparation method and application

Abstract

The present invention discloses a high-resolution cold neutron imaging material, wherein the cold neutron imaging material contains gadolinium oxide and an emulsion. The design of the material breaks through the limitation of the coupling screen and improves the resolution of the material; the resolution of the material in the field of cold neutron imaging can reach 10 μm. The present invention also discloses a preparation method and application of the cold neutron imaging material.

Description

Technical Field

[0001] The present invention relates to the technical field of neutron photography, and more specifically to a high-resolution cold neutron imaging material and a preparation method and application thereof. Background Art

[0002] At present, neutron photography is widely used in the field of non-destructive testing. Since the mechanism of neutron-matter interaction is different from that of X-rays, neutron photography has the following advantages over X-ray imaging technology: neutron photography can detect the structure of hydrogen-containing materials, identify different substances with similar atomic numbers, distinguish isotopes, and penetrate heavy metal elements to detect light elements inside. All these make neutron photography superior to X-ray photography.

[0003] Neutron radiography is divided into two categories, direct digital imaging and indirect digital imaging. These two types of imaging systems are further divided into CCD-coupled phosphor screens (Nuclear Instruments and Methods. 1999; A424: 48-52), neutron imaging plates (a. Nuclear Instruments and Methods. 2001; A458: 720-728. b. Nuclear Instruments and Methods. 2001; A463: 324-330), and film-coupled phosphor screens (Nuclear Instruments and Methods. 1999; A424: 190-199).

[0004] The CCD-coupled fluorescent screen includes a scintillator screen and a CCD combination. The main principle is that after neutrons irradiate the scintillator screen, the scintillator screen can emit fluorescence. The light signal is detected by the CCD or CMOS after multiple refractions, and the light signal is converted into a digital image. This type of system belongs to direct digital imaging. However, the disadvantages of this system are that the equipment is expensive, the installation conditions are high, and the resolution is not as good as film.

[0005] Neutron imaging plate is a type of digital imaging technology that uses imaging plates as information carriers. The principle is that when neutrons pass through an object and irradiate the active layer of the imaging plate, the neutron conversion material in the active layer can convert the neutron rays into secondary radiation. At the same time, the storage phosphor in the active layer stores the secondary radiation in the form of color centers. After laser scanning, the information stored in these color centers is read out in the form of fluorescence to form a digital image.

[0006] Film-coupled fluorescent screens have huge advantages over CCD-coupled fluorescent screens, such as ultra-long exposure, simple system structure, easy installation, low cost, and high image resolution. However, there are also certain disadvantages. For example, in the film-coupled screen system, the image resolution is severely restricted by the resolution of the coupled screen, which is the main problem at present. Summary of the invention

[0007] Based on the above problems, the first object of the present invention is to provide a high-resolution cold neutron imaging material. When the material is used in the field of cold neutron imaging, it does not require the participation of a coupling screen, can directly form an image, and the image formed has high resolution and high imaging density.

[0008] The second object of the present invention is to provide a method for preparing a high-resolution cold neutron imaging material.

[0009] The third object of the present invention is to provide an application of high-resolution cold neutron imaging materials.

[0010] In order to achieve the above first object, the present invention adopts the following technical scheme:

[0011] A high-resolution cold neutron imaging material comprises gadolinium oxide and emulsion.

[0012] The cold neutron imaging material in the present invention is a composite material formed by physically compounding gadolinium oxide and emulsion, wherein both gadolinium oxide and emulsion are in granular form.

[0013] Furthermore, in the cold neutron imaging material, the gadolinium oxide particles have a particle size of 10 nm-5 μm, preferably 40 nm-1 μm; and the emulsion particles have a particle size of 0.5-2 μm. The gadolinium oxide particles and the emulsion particles in the composite material are physically mixed, and the emulsion particles play a role of mechanical support, so that the gadolinium oxide particles are arranged uniformly and densely, which is beneficial to improving the uniformity of particle dispersion, thereby improving the imaging performance of the gadolinium oxide@emulsion composite material (cold neutron imaging material).

[0014] Further, the mass ratio of gadolinium oxide to the emulsion is 0.5-50. Exemplarily, the mass ratio of gadolinium oxide to the emulsion includes but is not limited to 0.5-40, 0.5-20, 0.5-10, etc.

[0015] Furthermore, the emulsion is a silver bromoiodide emulsion.

[0016] In order to achieve the above second purpose, the present invention adopts the following technical solutions:

[0017] A method for preparing a high-resolution cold neutron imaging material comprises the following steps:

[0018] providing an emulsion;

[0019] Provide gadolinium oxide gelatin solution;

[0020] The emulsion is physically compounded with a gadolinium oxide solution.

[0021] Furthermore, the preparation of the emulsion comprises the following steps:

[0022] Add silver solution, bromine solution and bromine-iodine solution into an emulsifier, and after the reaction, add sodium polystyrene sulfonate solution and acetic acid solution to obtain a precipitate;

[0023] The precipitate is washed with deionized water to remove impurities, thereby obtaining a purified precipitate;

[0024] The purified precipitate, deionized water, gelatin and Na2CO3 are mixed and stirred to obtain the emulsion.

[0025] Furthermore, in the total amount of the silver solution, the bromine solution and the bromine-iodine solution, the molar ratio of the total silver element to the total bromine element is 1:1-1:10; and the molar ratio of the total bromine element to the iodine element is 80:20-99:1.

[0026] Furthermore, the silver solution is an aqueous solution of silver nitrate; in the silver solution, the mass fraction of AgNO3 is 10%-40%.

[0027] Furthermore, the bromine solution is an aqueous solution of potassium bromide; in the bromine solution, the mass fraction of KBr is 10%-40%.

[0028] Furthermore, the bromine-iodine solution is an aqueous solution of KBr and KI; in the bromine-iodine solution, the mass fraction of KBr is 10%-40%, and the mass fraction of KI is 1%-5%.

[0029] Further, the speed at which the silver solution, bromine solution, and bromine-iodine solution are added to the emulsifier is 0.5 mL / min-50 mL / min, and the reaction time is 10 min-300 min. Exemplarily, the speed at which the silver solution, bromine solution, and bromine-iodine solution are added to the emulsifier includes but is not limited to 0.5-10 mL / min, 0.5-8 mL / min, 0.5-6 mL / min, 1-10 mL / min, 1-8 mL / min, 1-5 mL / min, 2-5 mL / min, 4-5 mL / min, 3-4 mL / min, 2-3 mL / min, etc. Exemplarily, the reaction time includes but is not limited to 10-100 min, 50-80 min, 110-150 min, 150-300 min, 150-200 min, etc.

[0030] Furthermore, the mass fraction of the sodium polystyrene sulfonate solution is 10%, and the mass fraction of the acetic acid solution is 10%.

[0031] Furthermore, the mass ratio of the precipitate, gelatin and sodium carbonate is 1:1:0.01.

[0032] Furthermore, the emulsion particle size is 0.5-2 μm.

[0033] Furthermore, the preparation of the gadolinium oxide gelatin solution includes the following steps: dispersing gadolinium oxide in a gelatin solution, and ball milling to obtain the gadolinium oxide gelatin solution.

[0034] Furthermore, in the gadolinium oxide gelatin solution, the gadolinium oxide particle size is 10 nm-5 μm, preferably 40 nm-1 μm.

[0035] Furthermore, the emulsion is physically compounded with the gadolinium oxide gelatin solution by mixing the emulsion with the gadolinium oxide gelatin solution.

[0036] Furthermore, before the emulsion is physically compounded with the gadolinium oxide solution, the emulsion is first subjected to chemical sensitization treatment.

[0037] Furthermore, the chemical sensitization treatment method comprises the following steps:

[0038] The pH of the emulsion is adjusted to 4-8, and a chemical sensitizer is added to carry out a reaction.

[0039] Furthermore, during the chemical sensitization treatment, the reaction is carried out in a water bath at 40-60°C.

[0040] Furthermore, the chemical sensitizer is selected from one or more of Na2S2O3, HAuCl4 and NH4SCN.

[0041] In order to achieve the third object, the present invention adopts the following technical solutions:

[0042] Application of the cold neutron imaging material as described in the first purpose above in the field of cold neutron imaging.

[0043] Furthermore, the application comprises the following steps:

[0044] preparing the cold neutron imaging material into a suspension;

[0045] The suspension is applied onto a support to form a thin film by a film-forming method.

[0046] Furthermore, the support is a glass substrate.

[0047] Furthermore, the preparation of the suspension includes the following steps: dispersing the cold neutron imaging material in a solvent, adding a surfactant, and then mixing and stirring the mixture to obtain the suspension.

[0048] Furthermore, the surfactant includes one or more of fluorocarbon 203 and sodium diisooctyl sulfosuccinate.

[0049] Furthermore, the film has a thickness of 10-50 μm.

[0050] The beneficial effects of the present invention are as follows:

[0051] In the cold neutron imaging material provided by the present invention, the absorber (Gd2O3) is combined with the imaging material emulsion, breaking through the limitation of the coupling screen and improving the resolution of the material; the material gives full play to the synergistic effect of the composite structure and obtains outstanding imaging performance, and its resolution in the field of cold neutron imaging can reach 10μm.

[0052] In the preparation method of the cold neutron imaging material provided by the present invention, the material preparation process is simple, the cost is low, and it can be produced on a large scale, and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings.

[0054] Figure 1 A scanning electron microscope image of the emulsion particles in Example 1 is shown.

[0055] Figure 2 The cold neutron imaging diagram in Example 1 is shown.

[0056] Figure 3 The cold neutron imaging diagram in Example 2 is shown.

[0057] Figure 4 A scanning electron microscope image of the emulsion particles in Example 3 is shown.

[0058] Figure 5 The cold neutron imaging diagram in Example 3 is shown.

[0059] Figure 6 A scanning electron microscope image of the emulsion particles in Example 4 is shown.

[0060] Figure 7 The cold neutron imaging diagram in Example 4 is shown. DETAILED DESCRIPTION

[0061] In order to more clearly illustrate the present invention, the present invention is further described below in conjunction with preferred embodiments and accompanying drawings. Similar components in the accompanying drawings are represented by the same reference numerals. It should be understood by those skilled in the art that the content specifically described below is illustrative rather than restrictive, and should not be used to limit the scope of protection of the present invention.

[0062] Example 1

[0063] A high-resolution cold neutron imaging material with excellent optical properties is prepared by the following method:

[0064] 1) Preparation of emulsion particles: Weigh 117g AgNO3 and dissolve it in 317mL deionized water to form a silver solution; weigh 74.4g KBr and dissolve it in 290mL deionized water to form a bromine solution; weigh 30g KBr and 4.9g KI and dissolve them in 130.5mL deionized water to form a bromine-iodine solution. Weigh 18g gelatin and dissolve it in 812.5mL deionized water to form a gelatin solution. Use a computer-controlled double-injection emulsifier to add silver solution, bromine solution and bromine-iodine solution at a feeding rate of 5mL / min, and react for 70min. Add 40mL 10% sodium polystyrene sulfonate solution and 20mL 10% acetic acid solution to precipitate the emulsion to obtain a precipitate. Wash the precipitate with deionized water to remove impurities. Stir the precipitate with 108g gelatin and 14mL 10% Na2CO3 to obtain an emulsion with an emulsion particle size of about 0.5μm.

[0065] 2) Preparation of gadolinium oxide solution: 20 g of gadolinium oxide was weighed and dispersed in 100 mL of 8% gelatin solution, and ball milled using a planetary ball mill to obtain a gadolinium oxide gelatin solution. The particle size of gadolinium oxide was about 40 nm.

[0066] 3) Preparation of gadolinium oxide@emulsion composite material: The prepared emulsion and gadolinium oxide gelatin solution were physically mixed at a mass ratio of emulsion to gadolinium oxide of 2:1.

[0067] 4) Preparation of composite cold neutron imaging film: Weigh 20g of the gadolinium oxide@emulsion composite material prepared above, then add 0.0125g of fluorocarbon 203 surfactant, and obtain a gadolinium oxide@emulsion composite cold neutron imaging film on a glass substrate by a film forming method. The film thickness is 10μm.

[0068] Performance test: Cold neutron photography was performed using the Mianyang Neutron Reactor, with a neutron flux of 10 12 cm -2 After 10 minutes of photography, the image was developed with D-19 developer for 5 minutes, fixed with F-5 fixer for 15 minutes, rinsed with deionized water, and imaged under a microscope after drying. The specific results are shown in Figure 1 and Figure 2 .from Figure 1 Scanning electron microscopy of emulsion particles shows that the particle size of the emulsion is 0.5 μm. Figure 2 The cold neutron imaging results show that 10μm lines can be resolved.

[0069] Under a microscope, the image is magnified 200 times, and the naked eye can clearly distinguish the outline of the image, with high imaging density.

[0070] Example 2

[0071] The same as in Example 1) except that:

[0072] 2) Preparation of gadolinium oxide solution: 20 g of gadolinium oxide was weighed and dispersed in 100 mL of 8% gelatin solution, and ball milled using a planetary ball mill to obtain a gadolinium oxide gelatin solution. The gadolinium oxide particle size was about 1 μm.

[0073] 3) Preparation of gadolinium oxide@emulsion composite material: The prepared emulsion and gadolinium oxide gelatin solution were physically mixed at a mass ratio of emulsion to gadolinium oxide of 2:1.

[0074] 4) Preparation of composite cold neutron imaging film: Weigh 20g of the gadolinium oxide@emulsion composite material prepared above, then add 0.0125g of fluorocarbon 203 surfactant, and obtain a gadolinium oxide@emulsion composite cold neutron imaging film on a glass substrate by a film forming method. The film thickness is 10μm.

[0075] Performance test: Cold neutron photography was performed using the Mianyang Neutron Reactor, with a neutron flux of 10 12 cm -2 After 10 minutes of photography, the image was developed with D-19 developer for 5 minutes, fixed with F-5 fixer for 15 minutes, rinsed with deionized water, and imaged under a microscope after drying. The specific results are shown in Figure 3 , cold neutron imaging results, can resolve 50μm lines.

[0076] Under a microscope, the image is magnified 200 times, and the naked eye can clearly distinguish the outline of the image, with high imaging density.

[0077] Example 3

[0078] The same as 2), 3) and 4) in Example 1, except that:

[0079] 1) Preparation of emulsion particles: Weigh 117g AgNO3 and dissolve it in 317mL deionized water to form a silver solution; weigh 74.4g KBr and dissolve it in 290mL deionized water to form a bromine solution; weigh 30g KBr and 4.9g KI and dissolve them in 130.5mL deionized water to form a bromine-iodine solution. Weigh 18g gelatin and dissolve it in 812.5mL deionized water to form a gelatin solution. Use a computer-controlled double-injection emulsifier to add silver solution, bromine solution and bromine-iodine solution at a feeding rate of 3mL / min, and react for 110min. Add 40mL of 10% sodium polystyrene sulfonate solution and 20mL of 10% acetic acid solution to precipitate the emulsion to obtain a precipitate. Wash the precipitate with deionized water to remove impurities. The precipitate after removing impurities was stirred with 108 g of gelatin and 14 mL of 10% Na2CO3 to obtain an emulsion with a particle size of about 0.8-1.0 μm.

[0080] Performance test: Cold neutron photography was performed using the Mianyang Neutron Reactor, with a neutron flux of 10 12 cm -2 After 10 minutes of photography, the image was developed with D-19 developer for 5 minutes, fixed with F-5 fixer for 15 minutes, rinsed with deionized water, and imaged under a microscope after drying. The specific results are shown in Figure 4 and Figure 5 .from Figure 4 Scanning electron microscopy of emulsion particles shows that the particle size of the emulsion is 0.8-1μm. Figure 5 The cold neutron imaging results show that 25μm lines can be resolved.

[0081] Under a microscope, the image is magnified 200 times, and the naked eye can clearly distinguish the outline of the image, with high imaging density.

[0082] Example 4

[0083] The same as 2), 3) and 4) in Example 1, except that:

[0084] 1) Preparation of emulsion particles: Weigh 117g AgNO3 and dissolve it in 317mL deionized water to form a silver solution; weigh 74.4g KBr and dissolve it in 290mL deionized water to form a bromine solution; weigh 30g KBr and 4.9g KI and dissolve them in 130.5mL deionized water to form a bromine-iodine solution. Weigh 18g gelatin and dissolve it in 812.5mL deionized water to form a gelatin solution. Use a computer-controlled double-injection emulsifier to add silver solution, bromine solution and bromine-iodine solution at a feeding rate of 2mL / min, and react for 160min. Add 40mL of 10% sodium polystyrene sulfonate solution and 20mL of 10% acetic acid solution to precipitate the emulsion to obtain a precipitate. Wash the precipitate with deionized water to remove impurities. The precipitate after removing impurities was stirred with 108 g of gelatin and 14 mL of 10% Na2CO3 to obtain an emulsion, and the particle size of the emulsion was about 1.5-2.0 μm.

[0085] Performance test: Cold neutron photography was performed using the Mianyang Neutron Reactor, with a neutron flux of 10 12 cm -2 After 10 minutes of photography, the image was developed with D-19 developer for 5 minutes, fixed with F-5 fixer for 15 minutes, rinsed with deionized water, and imaged under a microscope after drying. The specific results are shown in Figure 6 and Figure 7 .from Figure 6 Scanning electron microscopy of emulsion particles shows that the particle size of the emulsion is 1.5-2.0 μm. Figure 5 The cold neutron imaging results show that 50μm lines can be resolved.

[0086] Under a microscope, the image is magnified 200 times, and the naked eye can clearly distinguish the outline of the image, with high imaging density.

[0087] Example 5

[0088] A high-resolution cold neutron imaging material with excellent optical properties is prepared by the following method:

[0089] 1) Preparation of emulsion particles: Weigh 117g AgNO3 and dissolve it in 317mL deionized water to form a silver solution; weigh 74.4g KBr and dissolve it in 290mL deionized water to form a bromine solution; weigh 30g KBr and 4.9g KI and dissolve them in 130.5mL deionized water to form a bromine-iodine solution. Weigh 18g gelatin and dissolve it in 812.5mL deionized water to form a gelatin solution. Use a computer-controlled double-injection emulsifier to add silver solution, bromine solution and bromine-iodine solution at a feeding rate of 5mL / min, and react for 70min. Add 40mL 10% sodium polystyrene sulfonate solution and 20mL 10% acetic acid solution to precipitate the emulsion to obtain a precipitate. Wash the precipitate with deionized water to remove impurities. Stir the precipitate with 108g gelatin and 14mL 10% Na2CO3 to obtain an emulsion with an emulsion particle size of about 0.5μm.

[0090] 2) Weigh 150 g of the above emulsion, adjust the pH to 6.6, add 0.4 mL of 0.1% sodium thiosulfate, 0.6 mL of 0.0167% chloroauric acid, and 0.6 mL of 0.02% ammonium thiocyanate, and perform chemical sensitization in a 50°C water bath for 110 minutes.

[0091] 3) Preparation of gadolinium oxide solution: 20 g of gadolinium oxide was weighed and dispersed in 100 mL of 8% gelatin solution, and ball milled using a planetary ball mill to obtain a gadolinium oxide gelatin solution. The particle size of gadolinium oxide was about 40 nm.

[0092] 4) Preparation of gadolinium oxide@emulsion composite material: The emulsion prepared after chemical sensitization in step 2) above is physically mixed with the gadolinium oxide gelatin solution at a mass ratio of emulsion to gadolinium oxide of 2:1.

[0093] 5) Preparation of composite cold neutron imaging film: Weigh 20 g of the gadolinium oxide@emulsion composite material prepared above, then add 0.0125 g of fluorocarbon surfactant, and obtain a gadolinium oxide@emulsion composite cold neutron imaging film on a glass substrate by a film forming method. The film thickness is 10 μm.

[0094] Performance test: Cold neutron photography was performed using the Mianyang Neutron Reactor, with a neutron flux of 10 12 cm -2 After 10 minutes of photography, the film was developed with D-19 developer for 5 minutes, fixed with F-5 fixer for 15 minutes, rinsed with deionized water, and imaged under a microscope after drying. The results of cold neutron imaging show that 10μm lines can be distinguished.

[0095] Under a microscope, the image is magnified 200 times, and the naked eye can clearly distinguish the outline of the image, with high imaging density.

[0096] Example 6

[0097] Example 1 was repeated, except that in step 3), the mass ratio of the emulsion to the gadolinium oxide was 1:2, and the other conditions remained unchanged. As in Example 1, cold neutron imaging was performed, and the 10 μm line could be distinguished. Under a microscope with a magnification of 200 times, the contour of the obtained image could be clearly distinguished by the naked eye, and the imaging density was high.

[0098] Example 7

[0099] Example 1 was repeated, except that in step 3), the mass ratio of the emulsion to the gadolinium oxide was 1:10, and the other conditions remained unchanged. As in Example 1, cold neutron imaging was performed, and 10 μm lines could be distinguished. Under a microscope, the image outline could be clearly distinguished by the naked eye at a magnification of 200 times, and the imaging density was high.

[0100] Example 8

[0101] Example 1 was repeated, except that in step 3), the mass ratio of the emulsion to gadolinium oxide was 1:20, and the other conditions remained unchanged. Cold neutron imaging was performed as in Example 1, and the result was that 10 μm lines could be distinguished. Under a microscope with a magnification of 200 times, the contour of the obtained image could be clearly distinguished by the naked eye, and the imaging density was high.

[0102] Comparative Example 1

[0103] 1) Preparation of emulsion particles: Weigh 117g AgNO3 and dissolve it in 317mL deionized water to form a silver solution; weigh 74.4g KBr and dissolve it in 290mL deionized water to form a bromine solution; weigh 30g KBr and 4.9g KI and dissolve them in 130.5mL deionized water to form a bromine-iodine solution. Weigh 18g gelatin and dissolve it in 812.5mL deionized water to form a gelatin solution. Use a computer-controlled double-injection emulsifier to add silver solution, bromine solution and bromine-iodine solution at a feeding rate of 5mL / min, and react for 70min. Add 40mL 10% sodium polystyrene sulfonate solution and 20mL 10% acetic acid solution to precipitate the emulsion to obtain a precipitate. Wash the precipitate with deionized water to remove impurities. Stir the precipitate with 108g gelatin and 14mL 10% Na2CO3 to obtain an emulsion with an emulsion particle size of about 0.5μm.

[0104] 2) Preparation of cold neutron imaging film: 20 g of the emulsion prepared above was weighed, and then 0.0125 g of sodium diisooctyl sulfosuccinate surfactant was added to obtain an emulsion cold neutron imaging film on a glass substrate by a film-forming method.

[0105] Performance test: Cold neutron photography was performed using the Mianyang Neutron Reactor, with a neutron flux of 10 12 cm -2, after 10 minutes of photography, it was developed with D-19 developer for 5 minutes, fixed with F-5 fixer for 15 minutes, rinsed with deionized water, and imaged under a microscope after drying. There was no template imaging, indicating that cold neutron imaging cannot be performed when there is only emulsion without neutron absorber.

[0106] Comparative Example 2

[0107] 1) Weigh 20 g of gadolinium oxide gelatin solution, then add 0.0125 g of sodium diisooctyl sulfosuccinate surfactant, and obtain a gadolinium oxide cold neutron imaging film on a glass substrate by a film forming method.

[0108] Performance test: Cold neutron photography was performed using the Mianyang Neutron Reactor, with a neutron flux of 10 12 cm -2 , after 10 minutes of photography, it was developed with D-19 developer for 5 minutes, fixed with F-5 fixer for 15 minutes, rinsed with deionized water, and imaged under a microscope after drying. There was no template imaging, indicating that cold neutron imaging cannot be performed when only neutron absorber is present but no emulsion is present.

[0109] Comparative Example 3

[0110] Example 1 was repeated, except that the gadolinium oxide was replaced with gadolinium oxysulfide, and step 2) was changed to: Preparation of gadolinium oxysulfide solution: 20 g of gadolinium oxysulfide was weighed, and the gadolinium oxysulfide was dispersed in 100 mL of 8% gelatin solution, and ball milled with a planetary ball mill to obtain a gadolinium oxysulfide gelatin solution, wherein the particle size of the gadolinium oxysulfide was about 40 nm.

[0111] The other conditions remain unchanged, and the material is obtained and a film is generated.

[0112] Performance test: Cold neutron photography was performed using the Mianyang Neutron Reactor, with a neutron flux of 10 12 cm -2 After 10 minutes of photography, the film was developed with D-19 developer for 5 minutes, fixed with F-5 fixer for 15 minutes, rinsed with deionized water, and imaged using a microscope after drying. The imaging resolution was poor, with a resolution of more than 100μm.

[0113] Comparative Example 4

[0114] Example 1 was repeated, except that in step 2), in the gadolinium oxide solution, the gadolinium oxide particle size was 8 nm, and other conditions remained unchanged. As in Example 1, cold neutron imaging was performed under a microscope and magnified 200 times. The contour of the image could not be clearly distinguished by the naked eye, and the imaging density was low.

[0115] Comparative Example 5

[0116] Example 1 was repeated, except that, in step 1), the emulsion particle size was 0.3 μm, and other conditions remained unchanged. As in Example 1, cold neutron imaging was magnified 200 times under a microscope, and the contour of the obtained image could not be clearly distinguished by the naked eye, and the imaging density was low.

[0117] Comparative Example 6

[0118] Example 1 was repeated, except that in step 1), the emulsion particles had an emulsion particle size of 2.5 μm, and other conditions remained unchanged. Cold neutron imaging was performed as in Example 1, and the imaging resolution was poor, with a resolution of more than 100 μm.

[0119] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not limitations on the implementation methods of the present invention. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is impossible to list all the implementation methods here. All obvious changes or modifications derived from the technical solution of the present invention are still within the protection scope of the present invention.

Claims

1. Application of a high-resolution cold neutron imaging material in the field of cold neutron imaging, characterized in that: The cold neutron imaging material comprises gadolinium oxide and emulsion; The mass ratio of gadolinium oxide to emulsion is 0.5-50; In the cold neutron imaging material, the gadolinium oxide particles have a particle size of 10 nm-5 μm, and the emulsion particles have a particle size of 0.5-2 μm; The emulsion is a silver bromoiodide emulsion; When the cold neutron imaging material is used in the field of cold neutron imaging, it does not require the participation of a coupling screen and can be directly imaged.

2. The use according to claim 1, characterized in that: In the cold neutron imaging material, the gadolinium oxide particles have a particle size of 40 nm-1 μm.

3. The use according to claim 1, characterized in that: The steps include: providing an emulsion; Provide gadolinium oxide gelatin solution; The emulsion is physically compounded with a gadolinium oxide solution.

4. The use according to claim 3, characterized in that: The preparation of the emulsion comprises the following steps: Add silver solution, bromine solution and bromine-iodine solution into an emulsifier, and after the reaction, add sodium polystyrene sulfonate solution and acetic acid solution to obtain a precipitate; The precipitate is washed with deionized water to remove impurities, thereby obtaining a purified precipitate; The purified precipitate, deionized water, gelatin and Na2CO3 are mixed and stirred to obtain the emulsion.

5. The use according to claim 4, characterized in that: The silver solution is an aqueous solution of silver nitrate; in the silver solution, the mass fraction of AgNO3 is 10%-40%.

6. The use according to claim 4, characterized in that: The bromine solution is an aqueous solution of potassium bromide; in the bromine solution, the mass fraction of KBr is 10%-40%.

7. The use according to claim 4, characterized in that: The bromine-iodine solution is an aqueous solution of KBr and KI; in the bromine-iodine solution, the mass fraction of KBr is 10%-40%, and the mass fraction of KI is 1%-5%.

8. The use according to claim 4, characterized in that: The silver solution, bromine solution and bromine-iodine solution are added into the emulsifier at a speed of 0.5 mL / min-50 mL / min, and the reaction time is 10 min-300 min.

9. The use according to claim 3, characterized in that: The preparation of the gadolinium oxide gelatin solution comprises the following steps: dispersing gadolinium oxide in a gelatin solution, and ball milling to obtain the gadolinium oxide gelatin solution.

10. The use according to claim 3, characterized in that: The method of physically compounding the emulsion with the gadolinium oxide gelatin solution is as follows: mixing the emulsion with the gadolinium oxide gelatin solution.

11. The use according to claim 10, characterized in that: Before the emulsion is physically compounded with the gadolinium oxide solution, the emulsion is firstly subjected to chemical sensitization treatment.

12. The use according to claim 11, characterized in that: The method of chemical sensitization treatment comprises the following steps: The pH of the emulsion is adjusted to 4-8, and a chemical sensitizer is added to carry out a reaction.

13. The use according to claim 12, characterized in that: The chemical sensitizer is selected from one or more of Na2S2O3, HAuCl4 and NH4SCN.

14. The use according to claim 1, characterized in that: The application comprises the following steps: preparing the cold neutron imaging material into a suspension; The suspension is applied onto a support to form a thin film by a film-forming method.

Images