CN103113670B - Fast neutrons fluorescent screen and preparation method thereof - Google Patents
Fast neutrons fluorescent screen and preparation method thereof Download PDFInfo
- Publication number
- CN103113670B CN103113670B CN201310034101.6A CN201310034101A CN103113670B CN 103113670 B CN103113670 B CN 103113670B CN 201310034101 A CN201310034101 A CN 201310034101A CN 103113670 B CN103113670 B CN 103113670B
- Authority
- CN
- China
- Prior art keywords
- fast neutron
- fluorescent screen
- temperature
- fast neutrons
- mould
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Abstract
The invention provides a fast neutrons fluorescent screen and a preparation method thereof. The fast neutrons fluorescent screen comprises the following components in percentage by weight: 14-16% of polypropylene, 4-6% of ethylene-vinyl acetate copolymer, 4-6% of a toughening agent, 70-75% of zinc sulfide phosphor and 1-2% of a coupling agent. The invention provides the fast neutrons fluorescent screen which has the advantages of being low in cost, low in Gamma noise interference, high in resolution and the like; by adopting of the fast neutrons fluorescent screen, the disadvantage of poor image forming quality of the existing fast neutrons fluorescent screen under the conditions of low collimation rate and high Gamma background can be overcome; and the fast neutrons fluorescent screen provided by the invention has the characteristics of being low in Gamma noise interference, relatively high in resolution and the like.
Description
Technical field
The invention belongs to fast-neutron detector field, be specifically related to a kind of novel fast neutron window of tube and its preparation method.The recoil proton excitated fluorescent powder utilizing the proton in fast neutron and window of tube to react to produce is luminous, to realize the process of sub-spaces distribution to the conversion of visible ray spatial distribution.Be mainly used in high-throughput, high gamma background, high resolving power fast neutron radiography field.
Background technology
Neutron-radiography has the feature and advantage that other lossless detection technology can not be substituted, and can obtain a lot of not getable important information of other conventional art.Ray detection, from X ray, compared with X-ray nondestructive testing, when X-ray penetrates object, is subject to extranuclear electron effect and is attenuated, therefore its mass attenuation coefficient, having with material atom ordinal number the funtcional relationship determined.Different from X-ray, neutron is not charged, can penetrating electrons layer easily, and with nucleus generation nuclear reaction, therefore its mass attenuation coefficient is relevant with the nucleus cross section of material with incident neutron energy, and ordination number relation is complicated.Due to the difference of above-mentioned mechanism, enable neutron photography have the unexistent function of following X ray: neutron: a) penetrate heavy element material, to most of heavy element, as iron, lead, uranium etc., mass absorption coefficient is little; B) to some light element, as large especially on the contrary in mass absorption coefficients such as water, hydrocarbon polymer, boron; C) isotropic substance is distinguished; D) high-quality image etc. can be become to severe radiation material.Particularly there is very large advantage can penetrate in many metals, the inner organic substance situation of heavy metal analysis.
Neutron convert screen is neutron photography device key part.Its performance directly affects final image quality.In fast neutron radiography field, conversion screen has plastic scintillator, scintillator fiber array etc. several.Plastic scintillator detection efficiency is higher, but the aberration that himself thickness brings can affect imaging results; Scintillator fiber array detection efficiency is very high, but the background that its optical fiber itself produces also can affect image quality, and scintillator fiber array cost is high.In addition, above two kinds of conversion screens are all sensitive to gamma ray.Under low Collimation Ratio height gamma background recording condition, above two kinds of fast neutron convertors all cannot provide gratifying photographic effect.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of fast neutron window of tube, the invention provides the fluoroscopic preparation method of a kind of fast neutron.
Fast neutron window of tube of the present invention, is characterized in: described fluoroscopic raw materials by weight is composed as follows: polypropylene 14% ~ 16%
Ethylene-vinyl acetate copolymer 4% ~ 6%
Toughner 4% ~ 6%
Zinc sulfide phosphor 70% ~ 75%
Coupling agent 1% ~ 2%
The fluoroscopic preparation method of fast neutron of the present invention, in turn includes the following steps:
A) coupling agent is used to carry out surface modification to fluorescent material
Load weighted zinc sulphide and coupling agent are joined in high speed rotating mixing machine, carry out high-speed mixing reaction, when temperature of reaction reaches 70 DEG C ~ 80 DEG C, stop mixing;
B) preparation of matrix material
After zinc sulphide good to tackiness agent, above-mentioned surface treatment and oxidation inhibitor are mixed, blended granulation in twin screw extruder, for subsequent use after drying;
C) hot-forming
On setting vulcanizing press plate, temperature is 175 DEG C, after temperature-stable, between the vulcanizing board mould that matrix material is housed being put into vulcanizing press; Pressurize after plasticizing 20 ~ 30min, pressure is 10Mpa, and exit 3 ~ 5 times, hot pressing time is 4 ~ 10min;
D) coldmoulding: mold heat is put on vulcanizing press and colds pressing, pressure is 10Mpa, until mould cools completely, then takes out mould; Repair Burr removal, cleaning surface spots, obtained required fast neutron window of tube.
In above-mentioned multiple material composition, polypropylene is fluoroscopic base material, takes into account the left and right of tackiness agent, is also the material producing recoil proton with fast neutron generation nuclear reaction simultaneously; The effect of ethylene-vinyl acetate copolymer is by the mobility of Reinforced Polypropylene, can better mix in powder; The effect of toughner is the toughness strengthening product, prevents product to use and cracked in preservation process; Zinc sulfide phosphor effect be by charged ion deposit energy transformation be visible ray; The effect of coupling agent is to phosphor surface modification, make powder and tackiness agent mixing evenly.The combination of these components and the above-mentioned percentage range of each component thereof, determined by lot of experiments, and aforesaid combination and percentage range thereof make fast neutron window of tube of the present invention have above-mentioned anti-gamma rays interference, high-resolution excellent balance.
The invention provides a kind of fast neutron fluorescence conversion screen with advantages such as low cost, the interference of low gamma noise, high resolving power, the shortcoming of existing fast neutron convertor image quality difference under low Collimation Ratio height gamma Basis Condition can be overcome, the present invention can solve existing fast neutron radiography conversion screen Problems existing, fast neutron window of tube of the present invention has low gamma noise jamming, and resolving power is high comparatively.
Accompanying drawing explanation
The fluoroscopic luminescent spectrum figure of Fig. 1 fast neutron.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
Its most preferred thickness of fast neutron window of tube of the present invention is 2mm ~ 3mm.The fluoroscopic Main Function of fast neutron is that the fast neutron spatial distribution not directly detected is converted into detectable visible ray spatial distribution.The rule that the fluorescence that luminescent material zinc sulphide in window of tube produces is inversely proportional to by square distance on the one hand weakens, and is subject to the absorption of screen material itself again and decays on the other hand.Though increase screen thick can increase fast-neutron detection efficiency the window of tube plane of incidence produce fluorescence can by self-absorption, therefore the fluoroscopic thickness of fast neutron is selected to reach balance between detection efficiency and light transmission rate, determines that the fluoroscopic thickness of fast neutron is 2mm ~ 3mm through a large amount of Theoretical Calculation and experiment.
The fluoroscopic thickness of fast neutron is 2 ~ 3mm, therefore adopts hot pressing to be its complete processing, and concrete preparation process is as follows:
A) coupling agent is used to carry out surface modification to fluorescent material.Load weighted zinc sulphide and coupling agent are joined in high speed rotating mixing machine, high-speed mixing makes its internal temperature reach about 70 DEG C, then stops mixing.
B) preparation of matrix material.After zinc sulphide good to tackiness agent, above-mentioned surface treatment and oxidation inhibitor are mixed, blended granulation in twin screw extruder, for subsequent use after drying.
C) hot-forming: on setting vulcanizing press plate, temperature is 175 DEG C, treats temperature-stable, puts between plate by the mould that a certain amount of matrix material is housed, and pressurize after plasticizing 30min, pressure is 10Mpa, and exit 3 times, hot pressing time is 4min.
D) coldmoulding: put into by mold heat on vulcanizing press and cold pressing, pressure is 10Mpa, until mould cools completely, then takes out mould.Repair except product burr, cleaning surface spots, the fast neutron window of tube that obtained 2mm ~ 3mm is thick.
Wherein unit surface gray scale represents fluoroscopic luminous efficiency, and this numerical value is higher, and luminous efficiency is higher.
Embodiment 1
By the ethylene-vinyl acetate copolymer (EVA) that the polypropylene granules of 9g Jingmen petrochemical iy produced, 3g U.S. Mobil are produced, the toughner POE that 3g Dupont is produced and mixing through the zinc sulfide phosphor of the good 45g trade mark p22-b of surface treatment, then join in torque rheometer, spinner velocity is 50rpm, temperature is 195 DEG C, feeding after in mixing 5min.On setting vulcanizing press plate, temperature is 190 DEG C, treats temperature-stable, puts between plate by the mould that a certain amount of matrix material is housed, and pressurize after plasticizing 15min, pressure is 10Mpa, and hot pressing time is 4min.Put into by mold heat on vulcanizing press and cold pressing, pressure is 10Mpa, until mould cools completely, then takes out mould.Subsequently by fast neutron radiography experiment test window of tube luminescent properties, list test result in Table 1.
Embodiment 2
By the ethylene-vinyl acetate copolymer (EVA) that the polypropylene granules of 9g Jingmen petrochemical iy produced, 3g U.S. Mobil are produced, the toughner POE that 3g Dupont is produced and mixing through the zinc sulfide phosphor of the good 45g trade mark p31 of surface treatment, then join in torque rheometer, spinner velocity is 50rpm, temperature is 195 DEG C, feeding after in mixing 5min.On setting vulcanizing press plate, temperature is 190 DEG C, treats temperature-stable, puts between plate by the mould that a certain amount of matrix material is housed, and pressurize after plasticizing 15min, pressure is 10Mpa, and hot pressing time is 4min.Put into by mold heat on vulcanizing press and cold pressing, pressure is 10Mpa, until mould cools completely, then takes out mould.Subsequently by fast neutron radiography experiment test window of tube luminescent properties, list test result in Table 1.
Embodiment 3
By the ethylene-vinyl acetate copolymer (EVA) that the polypropylene granules of 9g Jingmen petrochemical iy produced, 3g U.S. Mobil are produced, the toughner POE that 3g Dupont is produced and mixing through the zinc sulfide phosphor of the good 45g trade mark p22-g of surface treatment, then join in torque rheometer, spinner velocity is 50rpm, temperature is 195 DEG C, feeding after in mixing 5min.On setting vulcanizing press plate, temperature is 190 DEG C, treats temperature-stable, puts between plate by the mould that a certain amount of matrix material is housed, and pressurize after plasticizing 15min, pressure is 10Mpa, and hot pressing time is 4min.Put into by mold heat on vulcanizing press and cold pressing, pressure is 10Mpa, until mould cools completely, then takes out mould.Subsequently by fast neutron radiography experiment test window of tube luminescent properties, list test result in Table 1.
Embodiment 4
By the ethylene-vinyl acetate copolymer (EVA) that the polypropylene granules of 9g Jingmen petrochemical iy produced, 3g U.S. Mobil are produced, the toughner POE that 3g Dupont is produced and mixing through the zinc sulfide phosphor of the good 45g trade mark Y26 of surface treatment, then join in torque rheometer, spinner velocity is 50rpm, temperature is 195 DEG C, feeding after in mixing 5min.On setting vulcanizing press plate, temperature is 190 DEG C, treats temperature-stable, puts between plate by the mould that a certain amount of matrix material is housed, and pressurize after plasticizing 15min, pressure is 10Mpa, and hot pressing time is 4min.Put into by mold heat on vulcanizing press and cold pressing, pressure is 10Mpa, until mould cools completely, then takes out mould.Subsequently by fast neutron radiography experiment test window of tube luminescent properties, list test result in Table 1.
Embodiment 5
By the ethylene-vinyl acetate copolymer (EVA) that the polypropylene granules of 9g Jingmen petrochemical iy produced, 3g U.S. Mobil are produced, the toughner POE that 3g Dupont is produced and mixing through the zinc sulfide phosphor of the good 45g trade mark P4 of surface treatment, then join in torque rheometer, spinner velocity is 50rpm, temperature is 195 DEG C, feeding after in mixing 5min.On setting vulcanizing press plate, temperature is 190 DEG C, treats temperature-stable, puts between plate by the mould that a certain amount of matrix material is housed, and pressurize after plasticizing 15min, pressure is 10Mpa, and hot pressing time is 4min.Put into by mold heat on vulcanizing press and cold pressing, pressure is 10Mpa, until mould cools completely, then takes out mould.Subsequently by fast neutron radiography experiment test window of tube luminescent properties, list test result in Table 1.
Embodiment 6
By the ethylene-vinyl acetate copolymer (EVA) that the polypropylene granules of 18 Jingmen petrochemical iy produced, 6g U.S. Mobil are produced, the toughner POE that 6g Dupont is produced and mixing through the zinc sulfide phosphor of the good 30g trade mark P22-b of surface treatment, then join in torque rheometer, spinner velocity is 50rpm, temperature is 195 DEG C, feeding after in mixing 5min.On setting vulcanizing press plate, temperature is 190 DEG C, treats temperature-stable, puts between plate by the mould that a certain amount of matrix material is housed, and pressurize after plasticizing 15min, pressure is 10Mpa, and hot pressing time is 4min.Put into by mold heat on vulcanizing press and cold pressing, pressure is 10Mpa, until mould cools completely, then takes out mould.Subsequently by fast neutron radiography experiment test window of tube luminescent properties, list test result in Table 1.
Embodiment 7
By the ethylene-vinyl acetate copolymer (EVA) that the polypropylene granules of 27g Jingmen petrochemical iy produced, 9g U.S. Mobil are produced, the toughner POE that 9g Dupont is produced and mixing through the zinc sulfide phosphor of the good 15g trade mark P22-b of surface treatment, then join in torque rheometer, spinner velocity is 50rpm, temperature is 195 DEG C, feeding after in mixing 5min.On setting vulcanizing press plate, temperature is 190 DEG C, treats temperature-stable, puts between plate by the mould that a certain amount of matrix material is housed, and pressurize after plasticizing 15min, pressure is 10Mpa, and hot pressing time is 4min.Put into by mold heat on vulcanizing press and cold pressing, pressure is 10Mpa, until mould cools completely, then takes out mould.Subsequently by fast neutron radiography experiment test window of tube luminescent properties, list test result in Table 1.
The luminous efficiency contrast of embodiment and comparative example in table 1, mixture of the present invention is obviously better than the mixture of comparative example.
Table 1 embodiment and comparative example parameter and luminous efficiency contrast thereof
Claims (2)
1. a fast neutron window of tube, is characterized in that: described fluoroscopic raw materials by weight is composed as follows:
Polypropylene 14% ~ 16%
Ethylene-vinyl acetate copolymer 4% ~ 6%
Toughner 4% ~ 6%
Zinc sulfide phosphor 70% ~ 75%
Coupling agent 1% ~ 2%.
2. the fluoroscopic preparation method of fast neutron according to claim 1, is characterized in that: in turn include the following steps:
A) coupling agent is used to carry out surface modification to fluorescent material
Load weighted zinc sulphide and coupling agent are joined in high speed rotating mixing machine, carry out high-speed mixing reaction, when temperature of reaction reaches 70 DEG C ~ 80 DEG C, stop mixing;
B) preparation of matrix material
After zinc sulphide good to tackiness agent, above-mentioned surface treatment and oxidation inhibitor are mixed, blended granulation in twin screw extruder, for subsequent use after drying;
C) hot-forming
On setting vulcanizing press plate, temperature is 175 DEG C, after temperature-stable, between the vulcanizing board mould that matrix material is housed being put into vulcanizing press; Pressurize after plasticizing 20 ~ 30min, pressure is 10MPa, and exit 3 ~ 5 times, hot pressing time is 4 ~ 10min;
D) coldmoulding: mold heat is put on vulcanizing press and colds pressing, pressure is 10MPa, until mould cools completely, then takes out mould; Repair Burr removal, cleaning surface spots, obtained required fast neutron window of tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310034101.6A CN103113670B (en) | 2013-01-29 | 2013-01-29 | Fast neutrons fluorescent screen and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310034101.6A CN103113670B (en) | 2013-01-29 | 2013-01-29 | Fast neutrons fluorescent screen and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103113670A CN103113670A (en) | 2013-05-22 |
| CN103113670B true CN103113670B (en) | 2015-02-11 |
Family
ID=48412095
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310034101.6A Expired - Fee Related CN103113670B (en) | 2013-01-29 | 2013-01-29 | Fast neutrons fluorescent screen and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103113670B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107195353B (en) * | 2017-04-27 | 2019-07-02 | 兰州大学 | The fluorescent powder of the cold and hot neutron-sensitive fill method in structure in the micron-scale |
| CN107479086B (en) * | 2017-08-25 | 2020-03-13 | 中国工程物理研究院核物理与化学研究所 | Preparation method of optical fiber embedded high-energy neutron conversion screen |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1054833A (en) * | 1990-02-21 | 1991-09-25 | 东北师范大学 | Neutron is taken pictures to glimmer and is strengthened screen |
| US6140651A (en) * | 1998-02-18 | 2000-10-31 | The United States Of America As Represented By The Secretary Of The Navy | Optically stimulated, fast neutron sensor and dosimeter and fiber-optic coupled fast neutron remote sensor and dosimeter |
| CN1352211A (en) * | 2001-12-04 | 2002-06-05 | 上海交通大学 | Process for preparing polypropylene fluorescent composite material capable of emitting organe-yellow light |
| CN202631460U (en) * | 2012-05-08 | 2012-12-26 | 东北师范大学 | Fast neutrons fluorescence transformation screen for photo taking |
-
2013
- 2013-01-29 CN CN201310034101.6A patent/CN103113670B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1054833A (en) * | 1990-02-21 | 1991-09-25 | 东北师范大学 | Neutron is taken pictures to glimmer and is strengthened screen |
| US6140651A (en) * | 1998-02-18 | 2000-10-31 | The United States Of America As Represented By The Secretary Of The Navy | Optically stimulated, fast neutron sensor and dosimeter and fiber-optic coupled fast neutron remote sensor and dosimeter |
| CN1352211A (en) * | 2001-12-04 | 2002-06-05 | 上海交通大学 | Process for preparing polypropylene fluorescent composite material capable of emitting organe-yellow light |
| CN202631460U (en) * | 2012-05-08 | 2012-12-26 | 东北师范大学 | Fast neutrons fluorescence transformation screen for photo taking |
Non-Patent Citations (1)
| Title |
|---|
| ZnS、聚丙烯混合快中子荧光屏14MeV中子照射时的性能初步理论分析;吴洋等;《核电子学与探测技术》;20090731;第29卷(第4期);p872-875以及p909 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103113670A (en) | 2013-05-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Sayyed et al. | Evaluation of shielding parameters for heavy metal fluoride based tellurite-rich glasses for gamma ray shielding applications | |
| Ersundu et al. | The heavy metal oxide glasses within the WO3-MoO3-TeO2 system to investigate the shielding properties of radiation applications | |
| Akman et al. | Gamma-ray attenuation parameters for polymer composites reinforced with BaTiO3 and CaWO4 compounds | |
| Dong et al. | Highly cost-effective shielding composite made from vanadium slag and boron-rich slag and its properties | |
| Kharita et al. | Review on the addition of boron compounds to radiation shielding concrete | |
| Baltas et al. | Radiation shielding properties of mortars with minerals and ores additives | |
| CN103224786B (en) | Lithio scintillator for neutron detection | |
| CN113201180B (en) | Neutron and gamma ray composite shielding material and preparation method thereof | |
| Akman et al. | Gamma attenuation characteristics of CdTe-Doped polyester composites | |
| CN103113670B (en) | Fast neutrons fluorescent screen and preparation method thereof | |
| Yılmaz et al. | A metal-ceramic-rubber composite for hybrid gamma and neutron radiation shielding | |
| Saleh et al. | Fabrication of novel lithium lead bismuth borate glasses for nuclear radiation shielding | |
| El-Sharkawy et al. | Bismuth oxide nanoparticles (Bi2O3 NPs) embedded into recycled-Poly (vinyl chloride) plastic sheets as a promising shielding material for gamma radiation | |
| Dong et al. | Shielding effectiveness of boron-containing ores in Liaoning province of China against gamma rays and thermal neutrons | |
| El-khatib et al. | Assessment of γ-radiation shielding behavior of some mixed nature clays | |
| Singh et al. | Studies of photon interaction and shielding parameters of lead alumino-borophosphate glass system | |
| Irfan et al. | Gamma irradiation protection via flexible polypyrrole coated bismuth oxide nanocomposites | |
| Kassem et al. | Optical and radiation shielding properties of PVC/BiVO4 nanocomposite | |
| Watanabe et al. | First performance test of newly developed plastic scintillator for radiation detection | |
| Mukamil et al. | Lead-borate glass system doped with Sm3+ ions for the X-ray shielding applications | |
| Singh et al. | Gamma radiation shielding and health physics characteristics of diaspore-flyash concretes | |
| Liao et al. | B4C/NRL flexible films for thermal neutron shielding | |
| CN103077761B (en) | A kind of thermal neutron fluorescent screen and preparation method thereof | |
| Tashlykov et al. | An extensive experimental study on the role of micro-size pozzolana in enhancing the gamma-ray shielding properties of high-density polyethylene | |
| De Martinis et al. | Luminescence and Structural Characterization of Gd2O2S Scintillators Doped with Tb3+, Ce3+, Pr3+ and F for Imaging Applications |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C53 | Correction of patent for invention or patent application | ||
| CB03 | Change of inventor or designer information |
Inventor after: Tang Bin Inventor after: Cao Chao Inventor after: Li Hang Inventor after: Tang Ke Inventor after: Zheng Zhou Inventor after: Zhang Yang Inventor after: Wu Yang Inventor after: Huo Heyong Inventor after: Sun Yong Inventor after: Yin Wei Inventor after: Tang Xiaorong Inventor after: Zhu Shilei Inventor after: Wang Sheng Inventor after: Liu Bin Inventor before: Tang Bin Inventor before: Wu Yang Inventor before: Huo Heyong Inventor before: Cai Xufu Inventor before: Liu Bin Inventor before: Tang Ke Inventor before: Yin Wei Inventor before: Sun Yong Inventor before: Cao Chao |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: INVENTOR; FROM: TANG BIN WU YANG HUO HEYONG CAI XUFU LIU BIN TANG KE YIN WEI SUN YONG CAO CHAO TO: TANG BIN WU YANG HUO HEYONG SUN YONG YIN WEI TANG XIAORONG ZHU SHILEI WANG SHENG LIU BIN CAO CHAO LI HANG TANG KE ZHENG ZHOU ZHANG YANG |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150211 Termination date: 20190129 |