A single-component large-area perovskite transparent fast neutron scintillator material, a preparation method and application thereof

Abstract

This invention discloses a single-component, large-area perovskite transparent fast neutron scintillation screen, its in-situ preparation method, and its applications. The general formula of the fast neutron scintillation material is: [R1(Ph)3P] m [R2(Ph)3P] 2‑m MX 2+n Wherein, R1 and R2 are each independently selected from one of C1-C20 alkyl, hydroxyethyl, carboxybutyl, and benzyl groups, and the number of carbon atoms in R2 is greater than the number of carbon atoms in R1. The single-component perovskite transparent fast neutron scintillation screen has tunable toughness, achieving the integration of fast neutron absorption and emission in the same compound. This imaging screen abandons traditional screen manufacturing processes, achieving in-situ synthesis of a fast neutron scintillation screen that can be directly used for imaging through a melt-rapid quenching method. This imaging screen exhibits strong light output capability and high spatial resolution under fast neutron conditions. This invention also discloses the in-situ preparation method and application of this fast neutron scintillation screen.

Description

Technical Field

[0001] This invention relates to the field of neutron radiography. More specifically, it relates to a single-component, large-area perovskite transparent fast neutron scintillator material, its preparation method, and its applications. Background Technology

[0002] Neutrons possess strong penetrating power because they are virtually unconstrained by external electrostatic fields, making them ideal probes for detecting the internal microstructure of matter. Depending on the neutron energy, neutron radiography techniques mainly include cold neutron radiography, thermal neutron radiography, and fast neutron radiography. Cold / thermal neutron radiography is relatively mature and offers high resolution. However, due to its low energy and weak penetrating power, it can only penetrate thin objects, and due to the scarcity of neutron sources, it is easily replaced by high-energy X-ray or gamma imaging. Compared to the former two, fast neutron radiography has higher energy and stronger penetrating power, allowing it to penetrate thick and heavy equipment to detect internal structures and defects. Simultaneously, fast neutrons also play a unique role in isotope identification and radioactive material detection, thus playing an irreplaceable role in aerospace, nuclear industry, energy, explosion protection, archaeology, and other fields. Nuclear recoil is the most commonly used fast neutron imaging mechanism. In this case, the incident neutron undergoes an elastic collision with the target atomic nucleus, releasing a recoil nucleus. Recoil nuclei deposit energy excite fluorescent materials to emit light, which is then converted into a digital image by a charge-coupled device (CCD) to achieve fast neutron detection and imaging. For two objects of equal mass, elastic collisions have the highest energy transfer efficiency; therefore, the proton in a hydrogen atom is the optimal nucleus for fast neutron scattering. Currently, commercially available ZnS(Ag):PP or ZnS(Cu):PP fast neutron imaging scintillators have reported a maximum spatial resolution of 2 lp / mm. Due to the physical mixing of scintillator powder and neutron absorbers (such as polymers PS, PP, etc.) in these two-component systems, neutrons are absorbed by the absorbers, and the converted neutron energy is then transferred to the scintillator for emission. This energy transfer process exposes problems such as inhomogeneous distribution of the scintillator in the substrate, energy transfer losses, and light scattering, potentially leading to low detection efficiency and spatial resolution. Therefore, there is an urgent need to find a novel fast neutron scintillator material that can achieve high resolution while being sensitive to fast neutrons, thus highlighting the advantages of fast neutron radiography.

[0003] Due to the designable molecular structures and tunable photoelectric properties of perovskite materials, they have seen rapid development in fields such as solar cells, X-ray / visible photodetectors, and light-emitting diodes. However, to date, the most recently reported hydrogen-rich two-dimensional perovskite fast neutron scintillators still require combination with neutron absorbers to fabricate imaging screens. Meanwhile, obtaining transparent perovskite fast neutron scintillators with higher resolution for fast neutrons remains a research direction for researchers in this field. Summary of the Invention

[0004] Based on the above facts, the purpose of this invention is to provide a single-component, large-area perovskite transparent fast neutron scintillator material, its preparation method, and its applications. This fast neutron scintillator material is transparent, sensitive to fast neutrons (able to emit light under fast neutron irradiation), and possesses high resolution. Furthermore, when used, this fast neutron scintillator material can be used alone to prepare a fast neutron transparent scintillator screen without the need for an additional neutron absorber.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] On one hand, the present invention provides a single-component, large-area perovskite transparent fast neutron scintillator material, wherein the general formula of the fast neutron scintillator material is: [R1(Ph)3P] m [R2(Ph)3P] 2-m MX 2+n ;

[0007] in:

[0008] R1 and R2 are each independently selected from one of C1-C20 alkyl, hydroxyethyl (-(CH2)2OH), carboxybutyl (-(CH2)3COOH), and benzyl (-CH2PhCH3), and the number of carbon atoms in R2 is greater than the number of carbon atoms in R1;

[0009] M is selected from one or more of Mn, Cu, Zn, In and Bi;

[0010] X is selected from one or more of Cl, Br and I;

[0011] The value of m is selected from 0 to 2, and m is not 0;

[0012] When M is selected from one or more of Mn, Cu and Zn, n is 2; when M is selected from In and / or Bi, n is 3.

[0013] In the technical solution of this invention, the general formula of the fast neutron scintillator material is (R1C). 18 H 15 P) m (R2C 18 H 15 P) 2-m MX 2+n .

[0014] In the fast neutron scintillator material of the present invention, R1C 18 H 15 P + (R1(Ph)3P +) is a triphenylphosphine cation with different small groups R1; R2C 18 H 15 P + (R2(Ph)3P + ) is a triphenylphosphine cation with different long-chain groups R2.

[0015] Furthermore, R1 and R2 are each independently selected from C1-C10 alkyl groups.

[0016] Furthermore, the alkyl group is selected from -CH2CH3, -(CH2)3CH3, -(CH2)4CH3, -(CH2)6CH3, and -(CH2). 11 CH3, -(CH2) 12 CH3 and -(CH2) 15 CH3.

[0017] Furthermore, the R1 includes, but is not limited to, one or more selected from -CH2CH3, -(CH2)3CH3, -(CH2)4CH3, and -C6H5.

[0018] Furthermore, the R2 is selected from -(CH2)6CH3, -(CH2) 11 CH3, -(CH2) 12 CH3 and -(CH2) 15 One or more of CH3.

[0019] By adjusting R2(Ph)3P containing long-chain groups + It can improve the resilience of the flickering screen.

[0020] Furthermore, when M is selected from two of the above-mentioned Mn, Cu, Zn, In, and Bi, the MX 2+n M1 can be used simultaneously x X n1 M2 1-x X n2 X2, where x is selected from 0 to 1 and x is not 0 or 1; n1 and n2 are positive numbers; M1 and M2 are different and are both selected from Mn, Cu, Zn, In and Bi; and the valence of M1 × x = n1, the valence of M2 × (1-x) = n2, n1+n2 = n.

[0021] For example, the general structural formula of the fast neutron scintillator material includes, but is not limited to: [CH3(CH2)3(Ph)3P]2MnBr4, [CH3(CH2)3(Ph)3P] 1.8 [CH3(CH2)6(Ph)3P] 0.2 MnBr4, [(CH2)2OH(Ph)3P] 1.6[CH3(CH2) 11 (Ph)3P] 0.4 MnBr4, [CH3CH2(Ph)3P]2MnBr4, [CH3(CH2)3(Ph)3P]2CuBr4, [CH3(CH2)3(Ph)3P]2Mn 0.8 Zn 0.2 Br4、[CH3CH2(Ph)3P]2Mn 0.8 Cu 0.2 Br4, etc.

[0022] In the structure of the fast neutron scintillator material of this technical solution, R1(Ph)3P + (that is, R1C) 18 H 15 P + ) and R2(Ph)3P + (i.e., R2C) 18 H 15 P + The high hydrogen content is beneficial for the absorption of fast neutrons, and the significant steric hindrance facilitates the formation of glassy, ​​transparent perovskites with a transmittance of up to 85% in the emission wavelength range, effectively reducing light scattering and improving spatial resolution; [MX] 2+n ] 2- As a light-emitting center, it avoids self-absorption and improves optical performance.

[0023] In another aspect, the present invention provides a method for preparing the single-component large-area perovskite transparent fast neutron scintillator material as described above, comprising the following steps:

[0024] R1(Ph)3PX, R2(Ph)3PX and MX with molar ratios of m:2-m:1 n The solid raw materials are ground into powder and mixed evenly to obtain a solid mixture;

[0025] The solid mixture is stirred and heated until it is completely melted and reacts with each other to form a liquid mixture, thus obtaining the fast neutron scintillator material;

[0026] The definitions of m, n, R1, R2, M, and X are as described above.

[0027] Furthermore, the stirring rate is 300-600 r / min; the heating temperature is 100-300℃, and the heating time is 1-2 h.

[0028] In another aspect, the present invention provides the application of the single-component large-area perovskite transparent fast neutron scintillator material as described above in the field of fast neutron detection and imaging.

[0029] Furthermore, the fast neutron scintillator material is used in the fabrication of a fast neutron transparent scintillator screen.

[0030] Furthermore, the fast neutron transparent scintillation screen is prepared in situ using a melt-rapid quenching method, which includes the following steps:

[0031] R1(Ph)3PX, R2(Ph)3PX and MX with molar ratios of m:2-m:1 n The solid raw materials are ground into powder and mixed evenly to obtain a solid mixture;

[0032] The solid mixture is stirred and heated until it is completely melted and reacts with each other to form a liquid mixture;

[0033] The liquid mixture is cooled in a mold to obtain the fast neutron transparent scintillation screen in situ;

[0034] The definitions of m, n, R1, R2, M, and X are as described above.

[0035] Using the above-mentioned rapid melting and quenching method, a single-component, self-supporting perovskite fast neutron transparent scintillation screen integrating absorption and emission was prepared in situ, successfully solving the problems of energy transfer loss and light scattering in traditional fast neutron scintillation screens. It absorbs fast neutrons and then emits visible light.

[0036] Furthermore, the solid mixture is placed in a heat-resistant container and then heated.

[0037] Furthermore, the heat-resistant vessel includes, but is not limited to, one or more of the following: crucible, glass dish, and iron pot.

[0038] Furthermore, the cooling method is rapid natural cooling, and the cooling time is 1-5 minutes.

[0039] Furthermore, the stirring rate is 300-600 r / min; the heating temperature is 100-300℃, and the heating time is 1-2 h.

[0040] Furthermore, the mold includes one or more of the following: silicone mold, graphite mold, and aluminum mold.

[0041] In this technical solution, the shape and size of the flashing screen can be adjusted by adjusting the shape and size of the mold. Exemplary flashing screen shapes include, but are not limited to, circles, squares, hearts, etc.

[0042] For example, the imaging area of ​​the flickering screen is adjustable, and a corresponding mold can be selected according to application requirements, including but not limited to 1-100cm. 2 .

[0043] Furthermore, the thickness of the flashing screen is adjustable, and the corresponding mold can be selected according to the application requirements, including but not limited to 0.1-2.0cm.

[0044] The perovskite fast neutron transparent scintillation screen obtained by the above preparation method not only possesses excellent self-support, but the method also allows for control of the final product's shape, area, and thickness by adjusting the mold shape and the volume of the poured melt. This controllability of product shape and thickness demonstrates great potential for practical applications.

[0045] In another aspect, the present invention provides a fast neutron transparent scintillator screen, which is prepared from raw materials comprising the fast neutron scintillator material as described above.

[0046] The beneficial effects of this invention are as follows:

[0047] The fast neutron scintillator material provided by this invention is transparent, and the organic cation R1(Ph)3P in its molecular structure is... + and R2(Ph)3P + The high hydrogen content is beneficial for the absorption of fast neutrons, and the significant steric hindrance facilitates the formation of a self-supporting, glassy, ​​transparent perovskite fast neutron scintillation screen. Its transmittance reaches up to 85% in the emission wavelength range, effectively reducing light scattering and improving spatial resolution. Simultaneously, the presence of long-chain groups in R2(Ph)3P... + Improved screen resilience; [MX] 2+n ] 2- As the luminescent center, it avoids self-absorption, thus improving optical performance. Furthermore, this scintillator screen does not require the addition of an additional neutron absorber; instead, it is a shape-controllable, self-supporting, transparent fast neutron scintillator screen prepared in situ using a melt-rapid quenching method. Simultaneously, the shape, size, and thickness of the perovskite fast neutron transparent scintillator screen prepared using this fast neutron scintillator material are controllable, and the imaging area can reach the centimeter level (e.g., a circle with a diameter of 6 cm or more). This technical solution is the first to achieve the design and fabrication of a single-component, self-supporting perovskite fast neutron transparent scintillator screen integrating absorption and emission, successfully solving the problems of energy transfer loss and light scattering in traditional fast neutron scintillator screens. The fast neutron transparent scintillator screen prepared by this technical solution exhibits good luminous efficiency and clear imaging effects under fast neutrons of different energies, with good spatial resolution reaching 5 lp / mm. This provides design principles for next-generation fast neutron scintillator materials and promotes the development of non-destructive testing in large-scale equipment based on fast neutron detection. Attached Figure Description

[0048] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0049] Figure 1A photograph of a circular fast neutron transparent scintillation screen with a diameter of 6 cm prepared in Example 1 is shown.

[0050] Figure 2 The images show physical images of fast neutron transparent scintillation screens of different shapes obtained using different preparation methods in Example 1.

[0051] Figure 3 The fast neutron transparent scintillation screen resolution template and fast neutron imaging (double-slit resolution test) of [CH3(CH2)3(Ph)3P]2MnBr4 with a diameter of 6 cm prepared in Example 1 are shown.

[0052] Figure 4 The [CH3(CH2)3(Ph)3P] shown in Example 2 is illustrated. 1.8 [CH3(CH2)6(Ph)3P] 0.2 Fast neutron imaging of MnBr4. Detailed Implementation

[0053] To more clearly illustrate the present invention, the following description, in conjunction with preferred embodiments and accompanying drawings, further explains the invention. Similar components in the drawings are indicated by the same reference numerals. Those skilled in the art should understand that the specific description below is illustrative rather than restrictive and should not be construed as limiting the scope of protection of the present invention.

[0054] Example 1

[0055] A large-area transparent fast neutron scintillation screen based on a single component of [CH3(CH2)3(Ph)3P]2MnBr4 with large steric hindrance was prepared by the following method:

[0056] Synthesis of [CH3(CH2)3(Ph)3P]2MnBr4: First, CH3(CH2)3(Ph)3PBr(C) in a molar ratio of 2:1 was weighed on an analytical balance. 22 H 24 Solid raw materials of PBr 798.6 mg and MnBr2 214.75 mg were ground into powder and mixed evenly in a high-temperature resistant glass dish. Then, the dish was placed on a heating table and stirred and heated to 250°C. The temperature was then maintained for 2 hours. It was observed that the solid powder completely melted and reacted to become a molten melt.

[0057] The molten material was then transferred to a silicone mold with a diameter of 6 cm and allowed to cool naturally. After the melt cooled for 5 minutes, a glassy fast neutron transparent scintillation screen [CH3(CH2)3(Ph)3P]2MnBr4 was obtained.

[0058] The thickness and shape of the final transparent scintillator can also be controlled by controlling the volume of the melt poured into the mold and the shape and size of the mold. Once demolded, a bright, glassy transparent scintillator screen can be obtained.

[0059] like Figure 1 The image shown is a physical photograph of a large-area [CH3(CH2)3(Ph)3P]2MnBr4 fast neutron transparent scintillation screen with a thickness of 1.82 mm and a diameter of 6 cm, prepared in this embodiment. From... Figure 1 As can be seen from this, the fast neutron scintillator is transparent.

[0060] Figure 2 The images show the different shapes of [CH3(CH2)3(Ph)3P]2MnBr4 fast neutron transparent scintillation screens prepared in this embodiment after adjusting the mold shape.

[0061] Performance testing: at a neutron flux of approximately 10 7 n / cm 2 Under fast neutron irradiation at a rate of / s, with an exposure time of 40s and a total of 5 exposures, a 1.82mm thick [CH3(CH2)3(Ph)3P]2MnBr4 fast neutron transparent scintillation screen can achieve a resolution of 5lp / mm. The resolution image is shown below. Figure 3 As shown.

[0062] Example 2

[0063] Based on [CH3(CH2)3(Ph)3P] which has large steric hindrance 1.8 [CH3(CH2)6(Ph)3P] 0.2 The preparation method of the MnBr4 single-component large-area perovskite fast neutron transparent scintillation screen is the same as that in Example 1, except that:

[0064] Example 2 [CH3(CH2)3(Ph)3P] 1.8 [CH3(CH2)6(Ph)3P] 0.2 In the preparation of MnBr4, the raw materials in Example 1 were replaced with CH3(CH2)3(Ph)3PBr(C) in a molar ratio of 1.8:0.2:1. 22 H 24 PBr)718.74mg、CH3(CH2)6(Ph)3PBr(C 25 H 30 88.28 mg of PBr and 214.75 mg of MnBr2 were added, and then the temperature was increased to 240℃. The mixture was stirred and kept at this temperature for 1.5 h. The mixture was then poured into a silicone mold. After demolding, a smooth and highly transparent [CH3(CH2)3(Ph)3P] with a thickness of 1.78 mm and a diameter of 6 cm was obtained. 1.8[CH3(CH2)6(Ph)3P] 0.2 MnBr4 single-component large-area fast neutron transparent scintillation screen.

[0065] Performance testing: at a neutron flux of approximately 10 7 n / cm 2 Irradiated with fast neutrons at a rate of / s, exposed for 40s, and exposed a total of 5 times, the above-mentioned [CH3(CH2)3(Ph)3P] with a thickness of 1.78mm was obtained. 1.8 [CH3(CH2)6(Ph)3P] 0.2 The resolution of the MnBr4 fast neutron transparent scintillation screen can reach 5 lp / mm, as shown in the resolution image. Figure 4 As shown.

[0066] Example 3

[0067] Based on [(CH2)2OH(Ph)3P], which has large steric hindrance 1.6 [CH3(CH2) 11 (Ph)3P] 0.4 The preparation method of the MnBr4 single-component large-area perovskite fast neutron transparent scintillation screen is the same as that in Example 2, except that:

[0068] Example 3 [(CH2)2OH(Ph)3P] 1.6 [CH3(CH2) 11 (Ph)3P] 0.4 In the preparation of MnBr4, the molar ratio of the raw materials in Example 2 was changed to 1.6:0.4:1 (CH2)2OH(Ph)3PBr(C 20 H 19 OHPBr) 619.60mg, CH3(CH2) 11 (Ph)3PBr(C 30 H 40 204.61 mg of PBr and 214.75 mg of MnBr2 were added, and then the temperature was increased to 220℃. The mixture was stirred and kept at this temperature for 1.5 h. The mixture was then poured into a silicone mold. After demolding, a smooth and highly transparent [(CH2)2OH(Ph)3P] with a thickness of 1.88 mm and a diameter of 6 cm was obtained. 1.6 [CH3(CH2)6(Ph)3P] 0.4 MnBr4 single-component large-area fast neutron transparent scintillation screen.

[0069] Performance testing: at a neutron flux of approximately 10 7 n / cm 2 [(CH2)2OH(Ph)3P] was exposed to fast neutrons at a rate of / s for 40s, and then exposed a total of 5 times, resulting in a thickness of 1.88mm. 1.6[CH3(CH2)6(Ph)3P] 0.4 The resolution of the MnBr4 fast neutron transparent scintillator can reach 5 lp / mm.

[0070] Example 4

[0071] The preparation method of the large-area perovskite fast neutron transparent scintillation screen based on the single component [CH3CH2(Ph)3P]2MnBr4 with large steric hindrance is the same as that in Example 1, except that:

[0072] In Example 4, during the preparation of [CH3CH2(Ph)3P]2MnBr4, 798.6 mg of CH3(CH2)3(Ph)3PBr(C) from Example 1 was used. 22 H 24 PBr) was replaced with 742.5 mg of CH3CH2(Ph)3PBr(C 20 H 20 PBr), then heated to 280℃, stirred and kept warm for 2 hours, and poured into a silicone mold; after demolding, a single-component large-area fast neutron transparent scintillation screen of [CH3CH2(Ph)3P]2MnBr4 with a thickness of 1.54mm and a diameter of 8cm with a smooth and highly transparent surface was obtained.

[0073] Performance testing: at a neutron flux of approximately 10 7 n / cm 2 Under fast neutron irradiation of / s, with an exposure time of 40s and a total of 5 exposures, the resolution of [CH3CH2(Ph)3P]2MnBr4 transparent glass with a thickness of 1.54mm can reach 5lp / mm.

[0074] Example 5

[0075] The preparation method of the large-area perovskite fast neutron transparent scintillation screen based on the single component [CH3(CH2)3(Ph)3P]2CuBr4 with large steric hindrance is the same as that in Example 1, except that:

[0076] In Example 5, during the preparation of [CH3(CH2)3(Ph)3P]2CuBr4, the 214.75 mg MnBr2 in Example 1 was replaced with 223.35 mg CuBr2. The temperature was then increased to 220°C, stirred, and kept warm for 1 hour. The mixture was then poured into a silicone mold. After demolding, a single-component large-area fast neutron transparent scintillation screen of [CH3(CH2)3(Ph)3P]2CuBr4 with a thickness of 2.21 mm and a diameter of 3 cm was obtained, which had a smooth surface and was highly transparent.

[0077] Performance testing: at a neutron flux of approximately 10 7 n / cm 2Under fast neutron irradiation of / s, with an exposure time of 40s and a total of 5 exposures, the resolution of the [CH3(CH2)3(Ph)3P]2CuBr4 fast neutron transparent scintillation screen with a thickness of 2.21mm can reach 5lp / mm.

[0078] Example 6

[0079] Based on [CH3(CH2)3(Ph)3P]2Mn with large steric hindrance 0.8 Zn 0.2 Br 4命名 A single-component, large-area perovskite transparent fast neutron scintillation screen was prepared by the following method:

[0080] [CH3(CH2)3(Ph)3P]2Mn 0.8 Zn 0.2 Synthesis of Br4: First, CH3(CH2)3(Ph)3PBr(C) in a molar ratio of 2:0.8:0.2 were weighed on an analytical balance. 22 H 24 Solid raw materials of 798.6 mg PBr, 171.8 mg MnBr2, and 45.04 mg ZnBr2 were ground into powder, mixed evenly, and placed in a high-temperature resistant glass dish. The mixture was then placed on a heating plate and heated to 260°C. After stirring and heating for 2 hours, the solid powder was observed to completely melt and react, becoming a molten state. The molten melt was then transferred to a silicone mold and allowed to cool naturally. After cooling for 5 minutes, a glassy fast neutron transparent scintillation screen [CH3(CH2)3(Ph)3P]2Mn was obtained. 0.8 Zn 0.2 Br4.

[0081] The thickness and shape of the final transparent scintillator can be controlled by controlling the volume of the melt poured into the mold and the shape and size of the mold. After demolding, a glassy fast neutron transparent scintillator with a thickness of 2.03 mm and a diameter of 5 cm with a smooth surface and high transparency can be obtained.

[0082] Performance testing: at a neutron flux of approximately 10 7 n / cm 2 Under fast neutron irradiation of / s, exposed for 40s, and exposed a total of 5 times, the above-mentioned 2.03mm thick [CH3(CH2)3(Ph)3P]2Mn 0.8 Zn 0.2 Br4 transparent glass can achieve a resolution of 5 lp / mm.

[0083] Example 7

[0084] Based on [CH3CH2(Ph)3P]2Mn with large steric hindrance 0.8 Cu0.2 Br 4命名 The preparation method of the single-component large-area perovskite fast neutron transparent scintillation screen is the same as that in Example 6, except that:

[0085] In Example 7, [CH3CH2(Ph)3P]2Mn 0.8 Cu 0.2 In the preparation of Br4, 798.6 mg of CH3(CH2)3(Ph)3PBr(C) from Example 6 was used. 22 H 24 PBr) was replaced with 742.5 mg of CH3CH2(Ph)3PBr(C 20 H 20 The ZnBr2 was replaced with 44.67 mg of CuBr2, and then heated to 280℃ and held for 2.5 h. The mixture was then poured into a silicone mold. After demolding, a smooth and highly transparent [CH3CH2(Ph)3P]2Mn oxide with a thickness of 1.91 mm and a diameter of 6 cm was obtained. 0.8 Cu 0.2 Br4 single-component large-area fast neutron transparent scintillation screen.

[0086] Performance testing: at a neutron flux of approximately 10 7 n / cm 2 [CH3CH2(Ph)3P]2Mn] was exposed to fast neutrons at a rate of / s for 40s, and a total of 5 exposures were performed to create a [CH3CH2(Ph)3P]2Mn layer with a thickness of 1.91mm. 0.8 Cu 0.2 The resolution of the Br4 fast neutron transparent scintillator can reach 5 lp / mm.

[0087] Comparative Example 1

[0088] The preparation process is the same as in Example 1, except that:

[0089] In the preparation of Comparative Example 1 [(CH3CH2)4N]2MnBr4, 798.6 mg of CH3(CH2)3(Ph)3PBr(C) from Example 1 was used. 22 H 24 PBr) was replaced with 420.32 mg of (CH3CH2)4NBr(C8H) 20 The NBr) was heated to 200℃ and held at that temperature for 1.5 hours, then poured into a silicone mold. After demolding, a relatively smooth [(CH3CH2)4N]2MnBr4 opaque flickering screen with a thickness of 1.84 mm and a diameter of 6 cm was obtained.

[0090] Performance testing: at a neutron flux of approximately 10 7 n / cm 2Under fast neutron irradiation of / s, with an exposure time of 40s and a total of 5 exposures, the spatial resolution of the opaque flickering screen with a thickness of 1.84mm is 0.2lp / mm.

[0091] Compared to Example 1, it is explained that R-(Ph)3PX(RC) 18 H 15 PX) is replaced with (CH3CH2)4NBr(C8H) 20 When NBr is used, the transparent fast neutron scintillator of the present invention cannot be synthesized, and the resolution is significantly reduced compared with other embodiments.

[0092] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. For those skilled in the art, other variations or modifications can be made based on the above description. It is impossible to exhaustively list all the implementation methods here. All obvious variations or modifications derived from the technical solutions of the present invention are still within the protection scope of the present invention.

Claims

1. A single-component, large-area perovskite transparent fast neutron scintillator material, characterized in that, The general formula for the fast neutron scintillator material is: [R1(Ph)3P] m [R2(Ph)3P] 2-m MX 2+n ; in: R1 and R2 are each independently selected from one of C1-C20 alkyl, hydroxyethyl, carboxybutyl, and benzyl groups, and the number of carbon atoms in R2 is greater than the number of carbon atoms in R1. M is selected from one or more of Mn, Cu, Zn, In and Bi; X is selected from one or more of Cl, Br and I; The value of m is selected from 0 to 2, and m is not 0; When M is selected from one or more of Mn, Cu and Zn, n is 2; when M is selected from In and / or Bi, n is 3.

2. The single-component, large-area perovskite transparent fast neutron scintillator material according to claim 1, characterized in that, R1 and R2 are each independently selected from C1-C10 alkyl groups, and the number of carbon atoms in R2 is greater than the number of carbon atoms in R1. Preferably, the alkyl group is selected from -CH2CH3, -(CH2)3CH3, -(CH2)4CH3, -(CH2)6CH3, and -(CH2). 11 CH3, -(CH2) 12 CH3 and -(CH2) 15 CH3.

3. The method for preparing a single-component, large-area perovskite transparent fast neutron scintillator material as described in any one of claims 1-2, characterized in that, Includes the following steps: R1(Ph)3PX, R2(Ph)3PX and MX with molar ratios of m:2-m:1 n The solid raw materials are ground into powder and mixed evenly to obtain a solid mixture; The solid mixture is stirred and heated until it is completely melted and reacts with each other to form a liquid mixture, and then cooled in a specified mold to obtain the fast neutron scintillator material; The definitions of m, n, R1, R2, M, and X are as described in claim 1.

4. The preparation method according to claim 3, characterized in that, The stirring rate is 300-600 r / min; the heating temperature is 100-300℃, and the heating time is 1-2 h.

5. The application of the single-component large-area perovskite transparent fast neutron scintillator material as described in claim 1 in the field of fast neutron detection and imaging.

6. The application according to claim 5, characterized in that, The fast neutron scintillator material is used in the fabrication of a fast neutron transparent scintillator screen.

7. The application according to claim 6, characterized in that, The fast neutron transparent scintillation screen is prepared in situ using a melt-rapid quenching method, which includes the following steps: R1(Ph)3PX, R1(Ph)3PX and MX with molar ratios of m:2-m:1 n The solid raw materials are ground into powder and mixed evenly to obtain a solid mixture; The solid mixture is stirred and heated until it is completely melted and reacts with each other to form a liquid mixture; The liquid mixture is cooled in a mold to obtain the fast neutron transparent scintillation screen in situ; The definitions of m, n, R1, R2, M, and X are as described in claim 1.

8. The application according to claim 7, characterized in that, The cooling method is rapid natural cooling, and the cooling time is 1-5 minutes.

9. The application according to claim 7, characterized in that, The stirring rate is 300-600 r / min; the heating temperature is 100-300℃, and the heating time is 1-2 h.

10. A fast neutron transparent scintillator screen, characterized in that, It is prepared from raw materials containing the fast neutron scintillator material as described in claim 1 or 2.

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