CN109946734A - A kind of low energy heavy isotope ionized gas ionization chamber detector - Google Patents
A kind of low energy heavy isotope ionized gas ionization chamber detector Download PDFInfo
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- CN109946734A CN109946734A CN201910212273.5A CN201910212273A CN109946734A CN 109946734 A CN109946734 A CN 109946734A CN 201910212273 A CN201910212273 A CN 201910212273A CN 109946734 A CN109946734 A CN 109946734A
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- gas ionization
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- entrance window
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- 238000001514 detection method Methods 0.000 claims abstract description 11
- 239000000463 material Substances 0.000 claims abstract description 5
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 claims description 8
- NNPPMTNAJDCUHE-UHFFFAOYSA-N isobutane Chemical compound CC(C)C NNPPMTNAJDCUHE-UHFFFAOYSA-N 0.000 claims description 8
- 239000001282 iso-butane Substances 0.000 claims description 4
- 235000013847 iso-butane Nutrition 0.000 claims description 4
- 239000001294 propane Substances 0.000 claims description 4
- 238000002955 isolation Methods 0.000 claims description 2
- 239000002245 particle Substances 0.000 abstract description 9
- 238000005259 measurement Methods 0.000 description 4
- 238000004760 accelerator mass spectrometry Methods 0.000 description 3
- 230000000740 bleeding effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 1
- 240000002853 Nelumbo nucifera Species 0.000 description 1
- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 1
- 229910052778 Plutonium Inorganic materials 0.000 description 1
- 229910052770 Uranium Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 230000005658 nuclear physics Effects 0.000 description 1
- OYEHPCDNVJXUIW-UHFFFAOYSA-N plutonium atom Chemical compound [Pu] OYEHPCDNVJXUIW-UHFFFAOYSA-N 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical compound [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 description 1
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- Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
- Measurement Of Radiation (AREA)
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Abstract
The invention belongs to ion detection technical fields, more particularly to a kind of low energy heavy isotope ionized gas ionization chamber detector, including vacuum chamber and equipped with the gas ionization chamber of entrance window, anode, cathode and the grid being arranged in parallel in gas ionization room, the indoor incident ion of vacuum can be entered between anode and cathode by entrance window, entrance window extends in gas ionization room, between anode and cathode.What entrance window was located at anode and cathode can effectively reduce low energy heavy isotope ion in the energy loss in entrance window and detector dead zone, so that more energy is deposited on the work sensitive volume of gas ionization chamber, be conducive to the detection and identification of low energy heavy isotope ion.Use the SiN film of 30nm thickness as the window material of entrance window, not only reduce energy loss of the particle when entering detector, while avoiding generation after other common organic films are filled with working gas in gas ionization room like that and heaving the case where forming dead zone.
Description
Technical field
The invention belongs to ion detection technical fields, and in particular to a kind of low energy heavy isotope ionized gas ionisation chamber detection
Device.
Background technique
Multianode gas ionization chamber is common detector in nuclear physics detecting.It mainly include anode, cathode, grid,
The part such as entrance window and working gas inlet and outlet forms.Basic structure is as shown in Figure 1
Anode and cathode is to provide a uniform electric field to detector.In order to avoid electronic impulse amplitude and incoming particle
Ionization position it is related, an aperture plate is installed between incoming particle and anode.Only electronics passes through grid in grid and anode
When drifting about in space, voltage pulse can be just induced on anode.Entrance window is the vacuum shape for detector and pipeline is isolated
State guarantees that the working gas in ionization keeps stablizing.When particle enters ionisation chamber, the energy discrimination that is generated on incident fenestrated membrane
Main contributions from the energy resolution for being influence ionisation chamber.So the entrance window of ionisation chamber must be thin as far as possible and uniform.
When ion passes through detector, it will be visited with working gas (the propane or iso-butane etc.) interaction in detector
The working gas for surveying device is ionized into electronic and ionic pair, electronic and ionic pair number and incident ion this region energy loss at
Direct ratio.
Rate of energy loss is incoming particle in the medium
In formulaIt is rate of energy loss, M, E are the quality and energy of incident core, Z respectivelyeIt is effective electricity of incoming particle
Lotus, it is closely related with the atomic number Z of incoming particle, B, b be one only with prevent medium in relation to and and incoming particle type,
The constant unrelated with energy.
These electronic and ionics in the case where transverse electric field acts on respectively to anode and cathodic drift, thus anode and cathode produce
Raw voltage pulse signal, and voltage pulse signal amplitude and the electronics of collection or ion number it is directly proportional, from there through detection
The pulse voltage amplitude that device generates realizes that particle is measured in the energy loss of anode and cathode.Multianode gas ionization chamber is exactly benefit
With ion in the difference of detector difference anode region energy loss, ion energy measurement is realized by the method that multichannel meets.
Summary of the invention
It is all the higher ion of energy ratio (~1MeV/ nucleon) in the ion of currently used gas detector measurement, because
This this kind of detector does not have particular/special requirement to the structure of detector entrance window and detector, and general structure is just able to satisfy requirement.
But with the development of Accelerator mass spectrometry, carry out the accelerator mass spectrometry measuring technique of research and development low energy heavy isotope at present, and
Realize the measurement of low energy (~0.01MeV/ nucleon) heavy isotope, multianode gas detector is most effective detector, it
It is possible to prevente effectively from the amplitude of other type of sensors loses effect.For this purpose, the object of the invention is to research and develop to be used for low energy
Special gas ionisation chamber in heavy isotope Accelerator mass spectrometry, to reduce the energy damage before ion enters detector as far as possible
Lose so that gas detector can heavy ion (uranium, plutonium) heavy isotope to 1MEV or so measurement and identification.
To achieve the above objectives, the technical solution adopted by the present invention is that a kind of low energy heavy isotope ionized gas ionisation chamber is visited
Survey device, including vacuum chamber and equipped with the gas ionization chamber of entrance window, be arranged in parallel in anode and cathode in gas ionization room and
Grid, the indoor incident ion of vacuum can be entered between the anode and the cathode by the entrance window, wherein institute
It states entrance window to extend in the gas ionization room, between the anode and the cathode.
Further, the entrance window realizes the vacuum chamber (1) and institute using the SiN film of 30nm thickness as window material
State the vacuum insulation between gas ionization chamber (2).
Further, the anode is several.
Further, filled with working gas in the gas ionization room, the working gas is propane or iso-butane.
Further, vacuum is extracted to the vacuum chamber and the gas ionization chamber by the same vacuum pump.
Further, the gas ionization chamber adjusts the gas of the working gas of the gas ionization chamber interior by needle-valve
Pressure.
The beneficial effects of the present invention are:
1. entrance window 6 extends in gas ionization chamber 2, low energy heavy isotope can effectively reduce positioned at anode 3 and cathode 5
Ion entrance window and detector dead zone energy loss so that the work that more energy is deposited on gas ionization chamber is sensitive
Area is conducive to the detection and identification of low energy heavy isotope ion.Entrance window setting is being visited unlike other gas detectors
Survey device inlet.Dead zone between detector entrance window and detector anode is thus effectively prevented, the energy in dead zone is avoided
Loss.
Table 1 is the heavy ion of different-energy by SiN film and in the energy loss result of detector.
| Incident ion | Ion energy | SiN thickness | Energy loss | Dump energy |
| 127I | 1.5MeV | 30nm | 70keV | 1.43MeV |
| 197Au | 1.5MeV | 30nm | 200kev | 1.30MeV |
2.SiN film has the characteristics that indeformable, uses SiN film as the window material of entrance window 6, avoids other common
Organic film be filled with to generate after working gas like that in gas ionization chamber 2 and heave the case where forming dead zone, to solve
The shortcomings that heaving the energy loss of region execution area generation cannot be collected by the anode 3 of detector and cathode 5.
Detailed description of the invention
Fig. 1 is existing multianode gas ionization chamber schematic diagram described in background of invention；
Fig. 2 is the gas of low energy heavy isotope ionized gas ionization chamber detector described in the specific embodiment of the invention
The schematic diagram of ionisation chamber part；
Fig. 3 is the signal of low energy heavy isotope ionized gas ionization chamber detector described in the specific embodiment of the invention
Figure；
In figure: 1- vacuum chamber, 2- gas ionization chamber, 3- anode, 4- grid, 5- cathode, 6- entrance window, 7- incident ion,
8- needle-valve, 9- air inlet, 10- insulator, 11- pressure gauge, the first bleeding point of 12-, 13- adjustable valve, the second bleeding point of 14-,
15- vacuum pump.
Specific embodiment
The invention will be further described with reference to the accompanying drawings and examples.
As shown in Figure 2 and Figure 3, a kind of low energy heavy ion gaseous ionization chamber detector provided by the invention, including vacuum chamber
1 and the gas ionization chamber 2 equipped with entrance window 6, the anode 3 and cathode 5 and grid 4 being arranged in parallel in gas ionization chamber 2, vacuum
Incident ion 7 in room 1 can be entered between anode 3 and cathode 5 by entrance window 6, wherein entrance window 6 extends to gas ionization
(see Fig. 2) in room 2, between anode 3 and cathode 5.
Entrance window 6, as window material, is realized true between vacuum chamber 1 and gas ionization chamber 2 using the SiN film of 30nm thickness
Sky isolation.
Anode 3 is several.
Filled with working gas in gas ionization chamber 2, working gas is propane or iso-butane.
In order to protect SiN film, the vacuum chamber 1 and gas ionization chamber 2 separated by the same vacuum pump 15 to SiN film is logical
It crosses adjustable valve 13 and slowly extracts vacuum.
Gas ionization chamber 2 passes through the external air inlet of needle-valve 8 and bleeding point, the working gas inside regulating gas ionisation chamber 2
Air pressure.
Device of the present invention is not limited to embodiment described in specific embodiment, those skilled in the art according to
Technical solution of the present invention obtains other embodiments, also belongs to the scope of the technical innovation of the present invention.
Claims (6)
1. a kind of low energy heavy isotope ionized gas ionization chamber detector, including vacuum chamber (1) and equipped with the gas of entrance window (6)
Ionisation chamber (2), the anode (3) and cathode (5) and grid (4) being arranged in parallel in gas ionization chamber (2), the vacuum chamber (1)
Interior incident ion (7) can be entered between the anode (3) and the cathode (5) by the entrance window (6), it is characterized in that:
The entrance window (6) extends in the gas ionization chamber (2), between the anode (3) and the cathode (5).
2. low energy heavy isotope ionized gas ionisation chamber detection as described in claim 1, it is characterized in that: the entrance window (6)
Using the SiN film of 30nm thickness as window material, the vacuum between the vacuum chamber (1) and the gas ionization chamber (2) is realized
Isolation.
3. low energy heavy isotope ionized gas ionisation chamber detection as claimed in claim 2, it is characterized in that: the anode (3) is
Several.
4. low energy heavy isotope ionized gas ionisation chamber detection as claimed in claim 3, it is characterized in that: the gas ionization chamber
(2) filled with working gas in, the working gas is propane or iso-butane.
5. low energy heavy isotope ionized gas ionisation chamber detection as claimed in claim 4, it is characterized in that: passing through the same vacuum
It pumps (15) and vacuum is extracted to the vacuum chamber (1) and the gas ionization chamber (2).
6. low energy heavy isotope ionized gas ionisation chamber detection as claimed in claim 5, it is characterized in that: the gas ionization chamber
(2) air pressure of the internal working gas of the gas ionization chamber (2) is adjusted by needle-valve (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910212273.5A CN109946734A (en) | 2019-03-20 | 2019-03-20 | A kind of low energy heavy isotope ionized gas ionization chamber detector |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910212273.5A CN109946734A (en) | 2019-03-20 | 2019-03-20 | A kind of low energy heavy isotope ionized gas ionization chamber detector |
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| Publication Number | Publication Date |
|---|---|
| CN109946734A true CN109946734A (en) | 2019-06-28 |
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| CN201910212273.5A Pending CN109946734A (en) | 2019-03-20 | 2019-03-20 | A kind of low energy heavy isotope ionized gas ionization chamber detector |
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Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4047040A (en) * | 1976-05-06 | 1977-09-06 | General Electric Company | Gridded ionization chamber |
| US4376893A (en) * | 1976-04-12 | 1983-03-15 | General Electric Company | Ion chamber array with reduced dead space |
| US4562354A (en) * | 1982-07-21 | 1985-12-31 | Kernforschungsanlage Julich Gmbh | Apparatus for measuring beta-gamma radiation exposure |
| DE19731608C1 (en) * | 1997-07-23 | 1998-10-22 | Vacutec Mestechnik Gmbh | Ionising chamber for radiometric measurements with high sensitivity |
| JPH10332835A (en) * | 1997-05-28 | 1998-12-18 | Toshiba Corp | Ionization chamber type radiation detector |
| CN1265222A (en) * | 1997-04-21 | 2000-08-30 | 东京电子亚利桑那公司 | Method and appts. for ionized sputtering of materials |
| US6346709B1 (en) * | 2000-03-01 | 2002-02-12 | The United States Of America As Represented By The Secretary Of The Army | Alpha, beta, and gamma monitor for measuring concentrations of ionizing radiation emitters in ambient air or other media |
| CN1469999A (en) * | 2000-10-13 | 2004-01-21 | 爱克斯康特公司 | Gaseous-based detector for ionizing radiation and method in manufacturing the same |
| CN201707443U (en) * | 2010-06-13 | 2011-01-12 | 中国科学院近代物理研究所 | Detector for heavy ion beam current transverse dose distribution measurement |
| CN202259132U (en) * | 2011-09-29 | 2012-05-30 | 江苏天瑞仪器股份有限公司 | Mass spectrometer hexapole and fixture thereof |
| CN209821402U (en) * | 2019-03-20 | 2019-12-20 | 中国原子能科学研究院 | Low-energy heavy nuclide ion gas ionization chamber detector |
-
2019
- 2019-03-20 CN CN201910212273.5A patent/CN109946734A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4376893A (en) * | 1976-04-12 | 1983-03-15 | General Electric Company | Ion chamber array with reduced dead space |
| US4047040A (en) * | 1976-05-06 | 1977-09-06 | General Electric Company | Gridded ionization chamber |
| US4562354A (en) * | 1982-07-21 | 1985-12-31 | Kernforschungsanlage Julich Gmbh | Apparatus for measuring beta-gamma radiation exposure |
| CN1265222A (en) * | 1997-04-21 | 2000-08-30 | 东京电子亚利桑那公司 | Method and appts. for ionized sputtering of materials |
| JPH10332835A (en) * | 1997-05-28 | 1998-12-18 | Toshiba Corp | Ionization chamber type radiation detector |
| DE19731608C1 (en) * | 1997-07-23 | 1998-10-22 | Vacutec Mestechnik Gmbh | Ionising chamber for radiometric measurements with high sensitivity |
| US6346709B1 (en) * | 2000-03-01 | 2002-02-12 | The United States Of America As Represented By The Secretary Of The Army | Alpha, beta, and gamma monitor for measuring concentrations of ionizing radiation emitters in ambient air or other media |
| CN1469999A (en) * | 2000-10-13 | 2004-01-21 | 爱克斯康特公司 | Gaseous-based detector for ionizing radiation and method in manufacturing the same |
| CN201707443U (en) * | 2010-06-13 | 2011-01-12 | 中国科学院近代物理研究所 | Detector for heavy ion beam current transverse dose distribution measurement |
| CN202259132U (en) * | 2011-09-29 | 2012-05-30 | 江苏天瑞仪器股份有限公司 | Mass spectrometer hexapole and fixture thereof |
| CN209821402U (en) * | 2019-03-20 | 2019-12-20 | 中国原子能科学研究院 | Low-energy heavy nuclide ion gas ionization chamber detector |
Non-Patent Citations (1)
| Title |
|---|
| A.M.MÜLLER ET AL: "Performance of the ETH gas ionization chamber at low energy", 《NUCLEAR INSTRUMENT AND METHODS IN PHYSICS RESEARCH》, pages 94 - 102 * |
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