CN113504292A - Isotope detection method - Google Patents
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- CN113504292A CN113504292A CN202110709670.0A CN202110709670A CN113504292A CN 113504292 A CN113504292 A CN 113504292A CN 202110709670 A CN202110709670 A CN 202110709670A CN 113504292 A CN113504292 A CN 113504292A
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- 238000001514 detection method Methods 0.000 title claims abstract description 29
- 150000002500 ions Chemical class 0.000 claims abstract description 101
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- 238000006243 chemical reaction Methods 0.000 claims description 12
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- 238000010586 diagram Methods 0.000 description 5
- 238000004949 mass spectrometry Methods 0.000 description 5
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- 238000000034 method Methods 0.000 description 4
- 210000002381 plasma Anatomy 0.000 description 3
- 229910052770 Uranium Inorganic materials 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000012634 fragment Substances 0.000 description 2
- 238000009616 inductively coupled plasma Methods 0.000 description 2
- 238000000613 inductively coupled plasma time-of-flight mass spectrometry Methods 0.000 description 2
- 238000001819 mass spectrum Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical compound [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 description 2
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- 238000000921 elemental analysis Methods 0.000 description 1
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- 238000012423 maintenance Methods 0.000 description 1
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/62—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode
- G01N27/626—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode using heat to ionise a gas
Abstract
The invention provides an isotope detection method, which comprises the following steps: the isotope enters a multilevel rod mass analyzer after being ionized, and the mass range section of the element corresponding to the isotope is screened; the screened ions enter a time-of-flight mass analyser, and when the last entering ions flying in the time-of-flight mass analyser have not yet reached a detector, the next ions enter the time-of-flight mass analyser. The invention has the advantages of high analysis precision and the like.
Description
Technical Field
The present invention relates to elemental analysis, and in particular to methods of isotope detection.
Background
Isotopes are elements having the same atomic number (proton number) and different mass numbers (neutron number), and are called isotopes, and are classified into stable isotopes and radioactive isotopes. Stable isotopes are isotopes whose radioactivity cannot be detected by naturally occurring technical means. In practice, the content of stable isotopes in nature is low, and it is difficult to express the difference of isotopes in absolute quantities, so that in practice, a relative measurement method is used, that is, the isotope ratio of a sample is obtained according to the isotope ratio of the measured sample and the isotope ratio of a corresponding standard, and the stable isotopes are widely applied to the fields of soil, medicine, agriculture, biology, ecology, environment and the like.
In many application occasions, the precision requirement for isotope ratio determination is very high, the isotope precision ratio of the traditional quadrupole mass spectrometer can only reach 0.2% level, the application requirement of the isotope ratio in each field can not be met, high-precision isotope determination is realized by means of magnetic mass spectrometry at this time, element separation is realized by magnetic mass spectrometry through double focusing of a magnetic field and an electric field, the simultaneous detection of a plurality of isotopes is realized through detectors of a plurality of channels, thereby different isotope channels can be simultaneously measured at any time, the fluctuation errors of samples, sample introduction, plasmas and the like can be completely eliminated, and very high isotope measurement precision is reached. However, the magnetic mass spectrum requires a huge magnetic field and extremely high vacuum requirements, the cost is high, the operation and maintenance are not easy, and the magnetic mass spectrum is difficult to popularize in all fields and is only limited to scientific research.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides an isotope detection method.
The purpose of the invention is realized by the following technical scheme:
an isotope detection method, comprising:
the isotope enters a multilevel rod mass analyzer after being ionized, and the mass range section of the element corresponding to the isotope is screened;
the screened ions enter a time-of-flight mass analyzer, and when the last entering ions flying in the time-of-flight mass analyzer do not reach a detector, the next ions enter the time-of-flight mass analyzer; the time difference Δ t between adjacent two times satisfies:
Compared with the prior art, the invention has the beneficial effects that:
1. the detection precision is high;
the time-of-flight mass analyzer operates in a vertical introduction mode, and energy dispersion is reduced through the vertical introduction;
all ions entering the flight time mass analyzer are ions generated at the same time, so that sample fluctuation caused by system sample introduction and fluctuation noise of an electric signal can be avoided, and the analysis precision of the ions is greatly improved;
meanwhile, ions entering the flight time mass analyzer only contain ions with very small fragments, and the deviation of the mass range is generally not more than 5, so that the time of the ions in the flight cavity can be fully utilized, the repeated utilization rate of the ions is improved in a pulse repetition mode in one period of ion flight, the average number of times of calculation is improved, and the analysis precision is improved;
in debugging, the spatial positions of the vertical torch tube and the coil are accurately and synchronously adjusted to reach the optimal position under each working condition, and the most accurate detection data is obtained;
the fine adjustment of the torch tube in three dimensions is realized, the position precision and the repetition precision in three directions can reach 0.01mm, and the optimal position of the flame and the cone of the torch tube is realized;
the flight time mass spectrometer can realize second-order time focusing on wider ion initial position dispersion, and the mass resolution is obviously improved;
2. the sensitivity is high;
the technical requirement on high-voltage pulse can be reduced by adopting a double-pulse repulsion technology; the invention adopts a double-repulsion mode of positive pulse pushing (repulsion electrode) and negative pulse pulling (traction electrode), the requirement of high voltage can be reduced by half, so that the rising edge is steeper and the pulse waveform can be improved;
the first grid and the second grid with equal electric potential are added in the middle of the double-pulse repulsion, so that the electric field permeation effect of the acceleration region on the ion modulation region can be reduced;
the first grid mesh and the second grid mesh are directly grounded, no extra voltage is added, and the adjusting difficulty is small;
the wider modulation region can be realized, and the ion flux and the sensitivity are improved;
3. the reliability is good;
the torch tube is vertically arranged and keeps relative static with the coil, and the torch tube and the coil move synchronously, so that the torch tube is prevented from being burnt out due to the fact that the torch tube is close to the coil when moving, and the problem that a sampling cone is burnt and deformed is solved;
the rotation of the motor is reliably converted into the vertical movement of the conversion piece by utilizing the conversion module and the conversion piece, and the bearing piece and the conversion piece only move in the vertical direction by using a plurality of guide pieces, so that the inclination of the bearing piece is effectively prevented, and the positioning accuracy and reliability of the torch tube are ensured;
4. the cost is low, and the maintainability is good;
the inductively coupled plasma mass spectrometer, the multi-stage rod mass analyzer and the flight time mass analyzer are mature technologies, and are low in cost and good in maintainability.
Drawings
The disclosure of the present invention will become more readily understood with reference to the accompanying drawings. As is readily understood by those skilled in the art: these drawings are only for illustrating the technical solutions of the present invention and are not intended to limit the scope of the present invention. In the figure:
FIG. 1 is a flow chart of a method of isotope detection in accordance with an embodiment of the present invention;
FIG. 2 is a schematic diagram of a mass spectrometer according to an embodiment of the invention;
FIG. 3 is a schematic structural diagram of a carrying unit according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a time-of-flight mass analyzer in accordance with an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a time-of-flight mass analyzer according to an embodiment of the present invention.
Detailed Description
Fig. 1-5 and the following description depict alternative embodiments of the invention to teach those skilled in the art how to make and use the invention. Some conventional aspects have been simplified or omitted for the purpose of explaining the technical solution of the present invention. Those skilled in the art will appreciate that variations or substitutions from these embodiments will be within the scope of the invention. Those skilled in the art will appreciate that the features described below can be combined in various ways to form multiple variations of the invention. Thus, the present invention is not limited to the following alternative embodiments, but is only limited by the claims and their equivalents.
Example 1:
fig. 1 is a flowchart of an isotope detection method according to an embodiment of the present invention, and as shown in fig. 1, the isotope detection method includes:
the isotope enters a multilevel rod mass analyzer after being ionized, and the mass range section of the element corresponding to the isotope is screened;
the screened ions enter a time-of-flight mass analyzer, and when the last entering ions flying in the time-of-flight mass analyzer do not reach a detector, the next ions enter the time-of-flight mass analyzer; the time difference Δ t between adjacent two times satisfies:
In order to improve the detection accuracy, further, in the mass spectrometry, a time-of-flight mass analyzer is used, the time-of-flight mass analyzer comprises a repulsion electrode, a field-free flight area and a detector, and the field-free flight area comprises a first incidence grid; the time-of-flight mass analyser further comprises:
a first ion acceleration region is formed between the traction electrode and the first incident grid;
the device comprises a first grid and a second grid, wherein the potential difference between the first grid and the second grid is zero; a second ion acceleration area is formed between the repulsion electrode and the first grid, and between the second grid and the traction electrode; the ions sequentially pass through the first grid mesh, the second grid mesh, the traction electrode, the first incidence grid mesh and the field-free flight area and are received by the detector.
The time-of-flight mass analyser further comprises:
a reflective region including a first reflective field including a second incident grid and reflective electrodes and a second reflective field including the reflective electrodes and reflective plates; ions emerging from the field-free flight zone are reflected by the reflective zone and are then received by the detector.
In order to realize second-order focusing, the second ion acceleration region and the first and second reflection fields satisfy the following conditions:
E1、E3、E4、E5electric field intensity, z, of the second ion acceleration region, the first reflection field and the second reflection field, respectively0、dG、d2、d3、d4、d5The distance between the incident ions and the first grid, the distance between the first grid and the second grid, the distance between the second grid and the traction electrode, the distance between the traction electrode and the first incident grid, the distance between the second incident grid and the reflection electrode, and the distance between the reflection electrode and the reflection plate are respectively; l is the length of flight of the ions between the first entrance grid and the detector.
In order to realize second-order focusing, the second ion acceleration area and the field-free reflection area satisfy the following conditions:
E1、E3electric field intensity, z, of the second ion acceleration region and the first ion acceleration region, respectively0、dG、d2、d3Respectively the distance between the incident ion and the first grid, the distance between the first grid and the second grid, the distance between the second grid and the traction electrode, and the distance between the traction electrode and the first incident grid; l is the length of flight of the ions between the first entrance grid and the detector.
To reduce energy dispersion, further, in a time-of-flight mass analyzer, ions sequentially pass through a first grid, a second grid, a first entrance grid, and a field-free flight zone from top to bottom.
In order to improve the operation reliability, further, after the isotope is ionized, the ion proceeding direction is vertically upward.
In order to improve the detection accuracy, further, in the mass spectrometry, the specific ionization mode is as follows:
the motor rotates, and the conversion module converts the rotation of the motor into the linear movement of the sliding piece;
converting the linear movement of the sliding part into the vertical movement of the conversion part, so as to drive the bearing part connected with the conversion part to vertically move along a plurality of guide parts, and the bearing unit arranged on the bearing part vertically moves along with the bearing part; the torch tube is vertically arranged on the carrying unit, and the coil is fixed on the carrying unit and is kept static relative to the torch tube;
the position of the bearing unit is adjusted in a two-dimensional mode in the horizontal direction, the bearing unit is arranged on the two-dimensional adjusting unit, and the two-dimensional adjusting unit is arranged on the bearing piece;
the sample enters the torch tube and is excited into plasma through the coil, so that ions are formed;
the ions pass through a sampling cone and enter a mass spectrometry unit.
In order to improve the detection accuracy, further, the ions which are vertically upward are deflected and enter the multi-stage rod mass analyzer which is horizontally arranged.
To improve detection accuracy, further, ions are entered into the time-of-flight mass analyser a plurality of times when the last entered ion flying in the time-of-flight mass analyser has not yet reached the detector.
Example 2:
an application example of the isotope detection method according to embodiment 1 of the present invention to uranium isotope detection.
In this application example, the uranium isotope is:
the nature has stable isotopes U234, U235 and U238, so that the total quantity of the U isotope and the abundance of the isotope are not only concerned in the analysis and measurement process, and the method has extremely important values for energy development, material application and safety monitoring. The traditional quadrupole mass spectrometer has insufficient precision for isotope analysis, and the double-focusing magnetic mass spectrometer for the traditional isotope analysis is extremely expensive and is high in cost when used in the field of conventional analysis.
In this embodiment, ICP-TOF-MS is used to realize ionization and analysis, and the multi-rod mass analyzer is a quadrupole mass analyzer, and the specific structure of ICP-TOF-MS is as follows:
as shown in fig. 2, the torch tube 101 and the coil 102 are respectively arranged on different parts of the carrier unit, the torch tube 101 and the coil 102 remaining relatively stationary;
as shown in fig. 3, the carrying unit includes a fixing portion 301, a first mounting portion 302, a second mounting portion 303, and a connecting portion 304; the second mounting part 303 is horizontally fixed on the first adjusting unit 201, the fixing part 301 is fixed on the upper side of the second mounting part 303, the connecting part 304 is vertically arranged, the lower end is fixed on the second mounting part 303, and the upper end is fixed with the horizontally arranged first mounting part 302; the torch tube 101 is vertically arranged on the first mounting part 302, one end of the coil 102 is fixed on the fixing part 301, and the other end of the coil surrounds the torch tube 101;
as shown in fig. 2, the second adjusting unit is fixed on the chassis 100 and comprises a motor 401, a screw 402, a nut 403, a guide rail 404, a slider 405 and a bearing, wherein the motor 401 drives the horizontally arranged screw 402 to rotate, the nut 403 is sleeved on the screw 402 by using a thread, the slider 405 is arranged on the guide rail 404 arranged in parallel with the screw 402, and the nut 403 is connected with the slider 405, so that when the unit screw 402 rotates, the slider 405 is driven to move horizontally and linearly along the guide rail 404; the bearing is disposed at the top end of the slider 405; the four corners of the carrier 503 are respectively provided with through holes for allowing the vertically arranged guides 504 to pass through, and the difference between the inner diameter of the through holes and the outer diameter of the guides 504 is small, so that the carrier 503 can only move vertically along the guides 504; the conversion piece is provided with a vertical part 501 and an inclined part 502, the lower end of the vertical part 501 is connected with the bearing part 503, the upper end of the vertical part is connected with the inclined part 502, the inclined part 502 is propped by the bearing, and the sliding piece 405 moves horizontally and linearly on the lower side of the inclined part 502, so that the inclined part 502 only moves vertically;
the first adjusting unit 201 adopts an electric two-dimensional moving platform to realize two-dimensional adjustment in the horizontal direction, and is arranged on the bearing part 503;
the specific mode of ionization is as follows:
the motor rotates, the driving nut 403 carries the sliding piece 405 to move horizontally and linearly on the guide rail 404;
the sliding member 405 moves linearly horizontally under the inclined portion 502 of the converting member, thereby converting into a vertical movement of the converting member (the converting member only moves vertically), thereby driving the carrier 503 connected to the converting member to move vertically along the plurality of guides 504 (the carrier 503 only moves vertically), and the carrier unit disposed on the carrier 503 moves vertically along with the carrier 503; the torch tube 101 is vertically arranged on the first mounting portion 302 of the carrier unit, and the coil 102 is fixed on the fixing portion 301 of the carrier unit and is kept relatively stationary with respect to the torch tube 101;
two-dimensionally adjusting the position of the bearing unit in the horizontal direction by using a first adjusting unit 201, the bearing unit being disposed on the first adjusting unit 201, the first adjusting unit 201 being disposed on the bearing 503; it can be seen that in the three-dimensional adjustment of the carrier unit, the torch tube 101 and coil 102 remain relatively stationary;
the sample is excited into a plasma by the coil 102, forming ions, upon entering the torch 101;
the ions vertically upwards pass through the sampling cone 103, then enter the ion deflection module, and then horizontally enter the quadrupole mass analyzer;
fig. 4 is a schematic structural diagram of a time-of-flight mass analyzer according to an embodiment of the present invention, and as shown in fig. 4, the time-of-flight mass analyzer includes:
a repeller 11, a field-free flight zone 30 and a detector 51, said field-free flight zone 30 comprising a first entrance grid 31;
a first ion acceleration region is formed between the traction electrode 12 and the first incident grid 31;
a first grid 21 and a second grid 22, wherein the potential difference between the first grid 21 and the second grid 22 is zero; a second ion acceleration region is formed between the repulsion electrode 11 and the first grid 21, and between the second grid 22 and the traction electrode 12; the ions sequentially pass through the first grid 21, the second grid 22, the traction electrode 12, the first incidence grid 31 and the field-free flight area 30, and are received by the detector 51; the first grid 21 and the second grid 22 are grounded, so that the first grid 21 and the second grid 22 are ensured to be in equal potential;
a plurality of electrodes allowing ions to pass through are arranged between the traction electrode 12 and the first incidence grid 31, and voltage division is carried out on the plurality of electrodes by using a voltage division resistor; a plurality of electrodes allowing ions to pass through are arranged between the traction electrode 12 and the first incident grid 31, and the voltage of the plurality of electrodes is divided by using a voltage dividing resistor, so that the electric field intensity of the first ion acceleration area is uniform; the power supply applies positive pulse voltage to the repulsion electrode 11 and applies negative pulse voltage to the traction electrode 12; the second ion acceleration region and the field-free reflection region satisfy:
E1、E3electric field intensity, z, of the second ion acceleration region and the first ion acceleration region, respectively0、dG、d2、d3The distance between the incident ion and the first grid 21, the distance between the first grid 21 and the second grid 22, the distance between the second grid 21 and the traction electrode 12, and the distance between the traction electrode 12 and the first incident grid 31, respectively; l is the length of flight of the ions between the first entrance grid 31 and the detector 51.
Ions from the quadrupole mass analyser enter the time-of-flight mass analyser, and when the ions fly in the time-of-flight mass analyser, the ions pass through the first grid, the second grid, the traction electrode 12, the first entrance grid and the field-free flight zone in sequence from top to bottom, i.e. the ions enter the time-of-flight mass analyser vertically.
In the embodiment, U elements are taken as an example, the scanning does not work in unit mass during quadrupole scanning, and by setting scanning parameters, the range from 234 to 238 is covered during quadrupole scanning, so that all U elements can enter the time-of-flight mass analyzer through quadrupole scanning;
the time-of-flight mass analyzer operates in a vertical introduction mode, and energy dispersion is reduced through the vertical introduction;
the ions entering the time-of-flight mass analyzer contain only the 234-238 mass range of elemental information, and the ions are separated due to the difference in velocity after the time-of-flight drift. All ions entering the flight time mass analyzer are ions generated at the same time, so that sample fluctuation caused by system sample introduction and fluctuation noise of an electric signal can be avoided, and the analysis precision of the ions is greatly improved;
meanwhile, ions entering the flight time mass analyzer only contain ions with small fragments, and the deviation of the mass range is generally not more than 5, so that the time of the ions in the flight cavity can be fully utilized, the repeated utilization rate of the ions is improved in a repeated pulse mode in one period of ion flight, the average number of times of calculation is improved, and the analysis precision is improved.
Example 3:
an application example of the isotope detection method according to example 1 of the present invention.
In the time-of-flight mass analyzer, as shown in fig. 5, the first grid 21 and the second grid 22 are grounded, so that the first grid 21 and the second grid 22 are equal in potential; a plurality of electrodes allowing ions to pass through are arranged between the traction electrode 12 and the first incident grid 31, and the voltage of the plurality of electrodes is divided by using a voltage dividing resistor, so that the electric field intensity of the first ion acceleration area is uniform; the power supply applies positive pulse voltage to the repulsion electrode 11 and applies negative pulse voltage to the traction electrode 12;
the reflective region includes a first reflected field including the second incident grid 32 and the reflective electrode 41, and a second reflected field including the reflective electrode 41 and the reflective plate 42; ions exiting the field-free flight zone 30 are reflected by the reflecting zone and then received by the detector 51;
arranging a plurality of electrodes allowing ions to pass through in the first ion acceleration area, the first reflection field and the second reflection field, and dividing the voltage of the plurality of electrodes by using a voltage dividing resistor so that the electric field intensity in the first ion acceleration area, the first reflection field and the second reflection field is uniform;
the second ion acceleration region and the first and second reflection fields satisfy:
E1、E3、E4、E5electric field intensity, z, of the second ion acceleration region, the first reflection field and the second reflection field, respectively0、dG、d2、d3、d4、d5The distance between the incident ion and the first grid 21, the distance between the first grid 21 and the second grid 22, the distance between the second grid 22 and the traction electrode 12, the distance between the traction electrode 12 and the first incident grid 31, the distance between the second incident grid 32 and the reflective electrode 41, and the distance between the reflective electrode 41 and the reflective plate 42, respectively; l is the length of flight of the ions between the first entrance grid 31 and the detector 51.
In ICP, unlike example 2, is:
1. the second mounting part and the connecting part are not arranged, the fixing part is directly fixed on the first adjusting unit, and the first mounting part is horizontally fixed on the fixing part;
2. the screw rod and the guide rail are kept parallel and are obliquely arranged relative to the horizontal plane;
3. the conversion piece comprises a horizontal part and a vertical part, and the horizontal part is supported by the sliding piece; when the slide member, which is moved in a straight line in an inclined manner, moves on the lower side of the horizontal portion of the switching member, the switching member moves vertically therewith, and only moves vertically.
Claims (10)
1. An isotope detection method, comprising:
the isotope enters a multilevel rod mass analyzer after being ionized, and the mass range section of the element corresponding to the isotope is screened;
the screened ions enter a time-of-flight mass analyzer, and when the last entering ions flying in the time-of-flight mass analyzer do not reach a detector, the next ions enter the time-of-flight mass analyzer; the time difference Δ t between adjacent two times satisfies:
2. The isotope detection method in accordance with claim 1, wherein the time-of-flight mass analyzer comprises a repeller, a field-free flight zone, and a detector, the field-free flight zone comprising a first entrance grid; the time-of-flight mass analyser further comprises:
a first ion acceleration region is formed between the traction electrode and the first incident grid;
the device comprises a first grid and a second grid, wherein the potential difference between the first grid and the second grid is zero; a second ion acceleration area is formed between the repulsion electrode and the first grid, and between the second grid and the traction electrode; the ions sequentially pass through the first grid mesh, the second grid mesh, the traction electrode, the first incidence grid mesh and the field-free flight area and are received by the detector.
3. The isotope detection method in accordance with claim 2, wherein the time-of-flight mass analyzer further comprises:
a reflective region including a first reflective field including a second incident grid and reflective electrodes and a second reflective field including the reflective electrodes and reflective plates; ions emerging from the field-free flight zone are reflected by the reflective zone and are then received by the detector.
4. The isotope detection method in accordance with claim 3, wherein the second ion acceleration zone and the first and second reflection fields satisfy:
E1、E3、E4、E5electric field intensity, z, of the second ion acceleration region, the first reflection field and the second reflection field, respectively0、dG、d2、d3、d4、d5The distance between the incident ions and the first grid, the distance between the first grid and the second grid, the distance between the second grid and the traction electrode, the distance between the traction electrode and the first incident grid, the distance between the second incident grid and the reflection electrode, and the distance between the reflection electrode and the reflection plate are respectively; l is the length of flight of the ions between the first entrance grid and the detector.
5. An isotope detection method in accordance with claim 3, wherein said second ion acceleration zone and field-free reflection zone satisfy:
E1、E3electric field intensity, z, of the second ion acceleration region and the first ion acceleration region, respectively0、dG、d2、d3Respectively the distance between the incident ion and the first grid, the distance between the first grid and the second grid, the distance between the second grid and the traction electrode, and the distance between the traction electrode and the first incident grid; l is the length of flight of the ions between the first entrance grid and the detector.
6. The isotope detection method in accordance with claim 2, wherein in the time-of-flight mass analyzer, ions pass through the first grid, the second grid, the first entrance grid, and the field-free flight zone in this order from top to bottom.
7. The isotope detection method according to claim 1, wherein after the isotope is ionized, the ion proceeding direction is directed vertically upward.
8. An isotope detection method according to claim 7, characterized in that the specific manner of ionization is:
the motor rotates, and the conversion module converts the rotation of the motor into the linear movement of the sliding piece;
converting the linear movement of the sliding part into the vertical movement of the conversion part, so as to drive the bearing part connected with the conversion part to vertically move along a plurality of guide parts, and the bearing unit arranged on the bearing part vertically moves along with the bearing part; the torch tube is vertically arranged on the carrying unit, and the coil is fixed on the carrying unit and is kept static relative to the torch tube;
the position of the bearing unit is adjusted in a two-dimensional mode in the horizontal direction, the bearing unit is arranged on the two-dimensional adjusting unit, and the two-dimensional adjusting unit is arranged on the bearing piece;
the sample enters the torch tube and is excited into plasma through the coil, so that ions are formed;
the ions pass through a sampling cone and enter the multi-stage rod mass analyzer.
9. An isotope detection method in accordance with claim 8 wherein vertically upwardly directed ions are deflected into a horizontally disposed multi-stage rod mass analyser.
10. An isotope detection method in accordance with claim 6, wherein a plurality of ions enter the time of flight mass analyser when a last entering ion in flight in the time of flight mass analyser has not reached a detector.
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