CN102129081B - Accompanying alpha particle detector for sealing neutron generator - Google Patents
Accompanying alpha particle detector for sealing neutron generator Download PDFInfo
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- CN102129081B CN102129081B CN201010620666.9A CN201010620666A CN102129081B CN 102129081 B CN102129081 B CN 102129081B CN 201010620666 A CN201010620666 A CN 201010620666A CN 102129081 B CN102129081 B CN 102129081B
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- CN
- China
- Prior art keywords
- yap
- sapphire glass
- photomultiplier
- flange
- neutron generator
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- 239000002245 particle Substances 0.000 title claims abstract description 18
- 238000007789 sealing Methods 0.000 title claims abstract description 14
- 239000013078 crystal Substances 0.000 claims abstract description 30
- 239000011521 glass Substances 0.000 claims abstract description 30
- 229910052594 sapphire Inorganic materials 0.000 claims abstract description 30
- 239000010980 sapphire Substances 0.000 claims abstract description 30
- 230000003287 optical effect Effects 0.000 claims abstract description 13
- 230000003068 static effect Effects 0.000 claims abstract description 6
- VXLGWCOZCKOULK-UHFFFAOYSA-K aluminum;cerium(3+);trihydroxide Chemical compound [OH-].[OH-].[OH-].[Al].[Ce+3] VXLGWCOZCKOULK-UHFFFAOYSA-K 0.000 claims description 27
- 229910052727 yttrium Inorganic materials 0.000 claims description 27
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 claims description 27
- 239000008393 encapsulating agent Substances 0.000 claims description 9
- LBDSXVIYZYSRII-IGMARMGPSA-N alpha-particle Chemical compound [4He+2] LBDSXVIYZYSRII-IGMARMGPSA-N 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 6
- 230000008020 evaporation Effects 0.000 claims description 3
- 238000001704 evaporation Methods 0.000 claims description 3
- JNDMLEXHDPKVFC-UHFFFAOYSA-N aluminum;oxygen(2-);yttrium(3+) Chemical compound [O-2].[O-2].[O-2].[Al+3].[Y+3] JNDMLEXHDPKVFC-UHFFFAOYSA-N 0.000 abstract 3
- YZCKVEUIGOORGS-OUBTZVSYSA-N Deuterium Chemical compound [2H] YZCKVEUIGOORGS-OUBTZVSYSA-N 0.000 description 3
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 229910052805 deuterium Inorganic materials 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000009958 sewing Methods 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- YZCKVEUIGOORGS-NJFSPNSNSA-N Tritium Chemical compound [3H] YZCKVEUIGOORGS-NJFSPNSNSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000011824 nuclear material Substances 0.000 description 1
- 229910000889 permalloy Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052722 tritium Inorganic materials 0.000 description 1
Abstract
The invention discloses an accompanying alpha particle detector for sealing a neutron generator, which comprises a photomultiplier, a luminescent crystal, an optical sealing flange and a shell, wherein the photomultiplier is arranged in the shell; the luminescent crystal is cerium-doped yttrium aluminate (YAP: Ce), the optical sealing flange is a sapphire glass flange, and the cerium-doped yttrium aluminate (YAP: Ce) is sealed in the neutron generator by the sapphire glass flange and kept in static high vacuum; the photomultiplier is positioned at the lower part of the sapphire glass flange, and the cerium-doped yttrium aluminate (YAP: Ce), the sapphire glass flange and the photomultiplier are fixed together in an elastic mode. The accompanying alpha particle detector for sealing the neutron generator has the advantages of high temperature resistance, simple structure and good sealing property.
Description
Technical field
The present invention relates to nuclear detection technology field, particularly a kind of adjoint alpha particle detector for sealing neutron generator.
Background technology
Nuclear material can be applied to the portable neutron generator with alpha particle detector to verify, the detection of the contraband goodss such as explosive, chemical weapons and drugs.
Utilize T (d, n)
4he reaction can produce the high-energy neutron of 14MeV.The α particle produced in the reaction and neutron are one-to-one relationship in time, and on geometric position, α particle is almost almost back-to-back with neutron flies out.Utilize with α particle label neutron, orientation meets, and can reduce background, raise the efficiency.
Produce T (d, n)
4the device of He reaction has Cockcroft-Walton accelerator and portable neutron generator, and principle of work is the high pressure acceleration deuterium bundle bombardment tritium target generation fast neutron by hundreds of kilovolts.The advantage of accelerator is long service life, installs additional with alpha particle detector relatively easy, and shortcoming is that volume is large, cannot move.The advantage of portable neutron generator is that volume is little, and be suitable for in-site measurement, shortcoming is restricted lifetime, installs additional with alpha particle detector difficulty large.
Portable neutron generator is a kind of special accelerator, makes rear without addition of vacuum system, is a vacuum device.The alpha particle detector be used in neutron generator will be applicable to the manufacture craft of neutron, high temperature resistant, and to meet the requirement of high-temperature baking exhaust in neutron tube manufacturing process, can work in the hydrogen gas atmosphere, time performance and the energy resolution performance of detector are good.
At present, the adjoint alpha particle detector of pertinent literature to neutron generator is had to carry out simple report in the world, but merely stated that the material characteristics of luminescent crystal and optical encapsulant flange in article, and do not record the structure of detector, structure still belongs to blank.
Summary of the invention
Instant invention overcomes deficiency of the prior art, provide that a kind of high temperature resistant, structure is simple, the adjoint alpha particle detector for sealing neutron generator of good airproof performance.
In order to solve the problems of the technologies described above, the present invention is achieved by the following technical solutions:
For an adjoint alpha particle detector for sealing neutron generator, comprise photomultiplier, luminescent crystal, optical encapsulant flange, shell; Luminescent crystal is for mixing Cerium aluminate yttrium (YAP:Ce), optical encapsulant flange is sapphire glass flange, key is, sapphire glass flange will be mixed Cerium aluminate yttrium (YAP:Ce) and be sealed in the vacuum of shell, it is made to become to be integrated with neutron generator, namely be sealed in neutron generator, keep static high vacuum; Photomultiplier is positioned at the bottom of sapphire glass flange, and Cerium aluminate yttrium (YAP:Ce) will be mixed by elastic type, sapphire glass flange, photomultiplier be fixed together.
Described will mix Cerium aluminate yttrium (YAP:Ce) by elastic type, sapphire glass flange, photomultiplier be fixed together and refer to and be provided with light hurdle mixing Cerium aluminate yttrium (YAP:Ce) crystal upper end, light hurdle is divided into upper and lower two parts, is connected between two parts by spring.Described Cerium aluminate yttrium (YAP:Ce) crystal thickness of mixing is 0.5mm, and diameter is 30mm.Described to mix above Cerium aluminate yttrium (YAP:Ce) crystal to incident α particle direction evaporation 1 μm of thick Ag film.
Compared with prior art, the invention has the beneficial effects as follows:
This device is by mixing Cerium aluminate yttrium (YAP:Ce) crystal and photomultiplier arranges resistant to elevated temperatures sapphire glass flange therebetween, and adopt elastic type to make to mix Cerium aluminate yttrium (YAP:Ce) crystal, sapphire glass flange and photomultiplier three and be fixed together, do not adopt any optical coupled agent, well achieve seamless link, avoid that pressure between three is excessive causes damage, ensure that the safe reliability of mixing Cerium aluminate yttrium (YAP:Ce) crystal, sapphire glass flange under the high temperature conditions; Having mixed above Cerium aluminate yttrium (YAP:Ce) crystal to incident α particle direction evaporation 1 μm of thick Ag film, better effective shielding scattering deuterium particle and prevent the impacts such as charge accumulated.
Accompanying drawing explanation
The principle schematic of Fig. 1 detector
The structural representation of Fig. 2 detector
Shell, 2 glazing hurdles, 3 metallic gaskets, 4 optical encapsulant flanges, 5 times light hurdles, 6 luminescent crystals, 7 rubber gaskets, 8 lower casings, 9 photomultipliers on 1
Embodiment
Below in conjunction with accompanying drawing and embodiment, the present invention is described in further detail:
As shown in Figure 1 and Figure 2, a kind of adjoint alpha particle detector for sealing neutron generator, primarily of photomultiplier 9, luminescent crystal 6, optical encapsulant flange 4, shell etc. four part composition, shell is composed of a fixed connection by upper shell 1, lower casing 8 bolt, luminescent crystal 6 is sealed in the upper shell 1 on detector top by optical encapsulant flange 4, keeps static high vacuum.Wherein in the present embodiment, Cerium aluminate yttrium (YAP:Ce) is mixed in luminescent crystal 6 employing, optical encapsulant flange 4 is sapphire glass flange, the effect of sapphire glass flange 4 is sealed in neutron generator by mixing Cerium aluminate yttrium (YAP:Ce) crystal 6, keep static high vacuum, mix the vacuum section that Cerium aluminate yttrium (YAP:Ce) crystal 6 and sapphire glass flange 4 are positioned at shell upper.Photomultiplier 9 is positioned at lower casing 8, mixes between Cerium aluminate yttrium (YAP:Ce) crystal 6 and photomultiplier 9 and is connected by sapphire glass flange 4.In upper shell 1, light hurdle is set, light hurdle is divided into glazing hurdle 2 and lower smooth hurdle 5 two parts, glazing hurdle 2 is connected by spring compression mode with lower smooth hurdle 5, utilize spring compression light hurdle 2, 5 will mix Cerium aluminate yttrium (YAP:Ce) crystal 6 is fixed on sapphire glass flange 4 upper end, utilize spring compression light hurdle 2, sapphire glass flange 4 lower end is fixedly connected with photomultiplier 9 by 5 modes, achieve flexible connection, make the connection between three tightr, this not only reduces the loss in optical transmission process, it also avoid the phenomenon of mixing Cerium aluminate yttrium (YAP:Ce) crystal 6 under the high temperature conditions and causing damage with sapphire glass flange 4 because high-temperature expansion coefficient is different.The place of sewing up between sapphire glass flange 4 and upper shell 1 adopts metallic gasket 3 to seal, and the place of sewing up between sapphire glass flange 4 and lower casing 8 adopts rubber gasket 7 to seal.
Mix the YAP:Ce crystal thickness 0.5mm that Cerium aluminate yttrium (YAP:Ce) crystal 6 is selected in the present embodiment, diameter 30mm, YAP:Ce luminescent center wavelength 360 ~ 370nm, easily mate with existing photomultiplier 9.In order to effectively reduce the impact of scattering deuterium bundle and charge accumulated, usually add the thick Ag film of one deck 1 μm at scintillator in the face of incident particle direction.Sapphire glass 4 adopts thickness to be the sapphire glass of 1.5mm, diameter 40mm.
In order to reduce the impact of earth magnetism on photomultiplier 9, outside photomultiplier 9, add a circle permalloy.
The principle of work of device:
α particle is beaten and is being mixed the light producing specific wavelength after on Cerium aluminate yttrium (YAP:Ce) crystal 6, be transmitted to outside neutron generator through sapphire glass flange 4, received by the photocathode of photomultiplier 9, after repeatedly doubling, export electric signal at photomultiplier 9 anode.
Another effect of sapphire glass flange 4 is sealed in neutron generator by mixing Cerium aluminate yttrium (YAP:Ce) crystal 6, keeps static high vacuum.
Claims (3)
1., for an adjoint alpha particle detector for sealing neutron generator, comprise photomultiplier, luminescent crystal, optical encapsulant flange, shell; Luminescent crystal is for mixing Cerium aluminate yttrium (YAP:Ce), and optical encapsulant flange is sapphire glass flange, it is characterized in that, sapphire glass flange will be mixed Cerium aluminate yttrium (YAP:Ce) and be sealed in neutron generator, keeps static high vacuum; Photomultiplier is positioned at the bottom of sapphire glass flange, and Cerium aluminate yttrium (YAP:Ce) will be mixed by elastic type, sapphire glass flange, photomultiplier be fixed together, described will mix Cerium aluminate yttrium (YAP:Ce) by elastic type, sapphire glass flange, photomultiplier be fixed together and refer to and be provided with light hurdle mixing Cerium aluminate yttrium (YAP:Ce) crystal upper end, light hurdle is divided into upper and lower two parts, is connected between two parts by spring.
2. a kind of adjoint alpha particle detector for sealing neutron generator according to claim 1, is characterized in that, described Cerium aluminate yttrium (YAP:Ce) crystal thickness of mixing is 0.5mm, and diameter is 30mm.
3. a kind of adjoint alpha particle detector for sealing neutron generator according to claim 2, is characterized in that, described to have mixed above Cerium aluminate yttrium (YAP:Ce) crystal to incident α particle direction evaporation 1 μm of thick Ag film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010620666.9A CN102129081B (en) | 2010-12-23 | 2010-12-23 | Accompanying alpha particle detector for sealing neutron generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010620666.9A CN102129081B (en) | 2010-12-23 | 2010-12-23 | Accompanying alpha particle detector for sealing neutron generator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102129081A CN102129081A (en) | 2011-07-20 |
| CN102129081B true CN102129081B (en) | 2016-04-06 |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113885069A (en) * | 2021-09-30 | 2022-01-04 | 中国工程物理研究院材料研究所 | Alpha detector and D-T neutron marking device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1187682A (en) * | 1998-01-23 | 1998-07-15 | 清华大学 | Adjoint alpha neutron tube for logging |
| WO2009119378A1 (en) * | 2008-03-24 | 2009-10-01 | 株式会社トクヤマ | Scintillator for neutron detection and neutron detector |
| CN201974530U (en) * | 2010-12-23 | 2011-09-14 | 中国原子能科学研究院 | Associated alpha particle detector used for sealing neutron generator |
-
2010
- 2010-12-23 CN CN201010620666.9A patent/CN102129081B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1187682A (en) * | 1998-01-23 | 1998-07-15 | 清华大学 | Adjoint alpha neutron tube for logging |
| WO2009119378A1 (en) * | 2008-03-24 | 2009-10-01 | 株式会社トクヤマ | Scintillator for neutron detection and neutron detector |
| CN201974530U (en) * | 2010-12-23 | 2011-09-14 | 中国原子能科学研究院 | Associated alpha particle detector used for sealing neutron generator |
Non-Patent Citations (2)
| Title |
|---|
| 伴随α粒子探测器的研制;李井怀 等;《中国原子能科学研究院年报》;20091231;389－390 * |
| 带伴随粒子中子发生器研制;肖坤祥 等;《2010全国荷电粒子源、粒子束学术会议》;20100630;65－79 * |
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| CN102129081A (en) | 2011-07-20 |
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