CN201173909Y - System of ion-pulse ionization chamber for measuring radon concentration - Google Patents
System of ion-pulse ionization chamber for measuring radon concentration Download PDFInfo
- Publication number
- CN201173909Y CN201173909Y CNU2008200055288U CN200820005528U CN201173909Y CN 201173909 Y CN201173909 Y CN 201173909Y CN U2008200055288 U CNU2008200055288 U CN U2008200055288U CN 200820005528 U CN200820005528 U CN 200820005528U CN 201173909 Y CN201173909 Y CN 201173909Y
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- Prior art keywords
- ionization chamber
- analysis system
- ion
- radon concentration
- measured
- 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 - Lifetime
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- SYUHGPGVQRZVTB-UHFFFAOYSA-N radon atom Chemical compound [Rn] SYUHGPGVQRZVTB-UHFFFAOYSA-N 0.000 title claims abstract description 19
- 229910052704 radon Inorganic materials 0.000 title claims description 16
- 238000005259 measurement Methods 0.000 claims abstract description 21
- 238000004458 analytical method Methods 0.000 claims abstract description 17
- 238000007405 data analysis Methods 0.000 claims abstract description 11
- 238000005070 sampling Methods 0.000 claims abstract description 9
- 238000009413 insulation Methods 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 4
- 239000012212 insulator Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000000919 ceramic Substances 0.000 claims description 2
- 229910000679 solder Inorganic materials 0.000 claims description 2
- 238000009532 heart rate measurement Methods 0.000 abstract 2
- 230000007774 longterm Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 13
- 238000001514 detection method Methods 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- 238000005202 decontamination Methods 0.000 description 2
- 230000003588 decontaminative effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000004082 amperometric method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Measurement Of Radiation (AREA)
Abstract
The utility model discloses a system which measures the concentration of niton with an ion-pulse ionization chamber as a detector. The system comprises a sampling inflation system (1) and an ionization chamber (2), wherein the sampling inflation system (1) is connected with the ionization chamber (2), the ionization chamber (2) is connected with an ion-pulse measurement and analysis system through a high resistance gating switch (3), the ion-pulse measurement and analysis system is also connected with a data analysis system, and the ionization chamber (2) and the data analysis system (10) are also connected with a current measurement and analysis system through the high resistance gating switch (3). The system provides niton measurement by ion pulse and also current, can measure the concentration of air samples directly, and is an ionization chamber niton concentration measuring system which is good in long term stability, high in accuracy and flexibility and wide in range of measurement.
Description
Technical field
The utility model relates to a kind of environment detection technical field, is specifically related to the system that a kind of ionization chamber is measured radon concentration.
Background technology
It is varied to survey the radon method at present in the world, press the sample mode branch, passive type TLD, active carbon adsorption, STD (solid trace), electret etc. are arranged, active have ionization chamber, scintillation chamber, two filter membranes etc., because the difference of the method for sampling, scale method and stability, exist between various emanometer device measured values than big-difference, therefore need the standard set-up amount of carrying out to pass, to guarantee the reliable of measured value.Standard set-up should adopt to have long-time stability, can carry out accurate measuring method for measuring, and comprises corresponding amount and pass equipment.As standard method of measurement, widespread usage be two kinds of methods of ionization chamber and LUCAS scintillation chamber.The advantage of scintillation chamber is the detection efficiency height, and equipment is simple, and is easy to operate, and shortcoming is that physical property easily changes, and causes the variation of detection efficiency, and is difficult for decontamination after polluting, thereby long-time stability are poor.Ionization chamber efficiency of measurement long-time stability are good, and the accuracy of measurement height is easier to decontamination.
And both at home and abroad the current ionization chamber lower limit of general utilization can not satisfy the ambient level radon concentration monitoring, and can not directly measure air sample in the electron-pulse ionization chamber, and just can measure after need removing gas in the negatron.
Summary of the invention
The utility model has overcome deficiency of the prior art, provide a kind of and can adopt the ion pulse method to survey radon to adopt current methods to measure again, the system of can directly measuring air sample and have that long-time stability are good, accuracy and the ionization chamber highly sensitive, that measurement range is wide being measured radon concentration.
In order to solve the problems of the technologies described above, the utility model is achieved through the following technical solutions:
This system comprises sampling gas charging system, ionization chamber, ion pulse measuring and analysis system, current measurement analytic system, data analysis system, the gas charging system of wherein sampling is connected with ionization chamber, ionization chamber is connected with the ion pulse measuring and analysis system by the high resistant gating switch, the ion pulse measuring and analysis system is connected with data analysis system again, and described ion pulse measuring and analysis system comprises that prime amplifier, main amplifier, discriminator, single-chip microcomputer connect to form successively; Described current measurement analytic system is connected to form by electrometer, gpib interface, also is connected with the current measurement analytic system by the high resistant gating switch between described ionization chamber and the data analysis system.
In order better to improve the accuracy of measuring, the utility model is all right: described ionization chamber adopts 4 cover ionization chambers to measure simultaneously; In order to reduce the scrambling of electric field, reach gamut, wherein to be the bivalve cylindrical for ionization chamber, the sealing of shell normal pressure, the inside surface electropolishing of inner casing, for stainless steel material and add positive high voltage and vacuum seal, with polyethylene insulation, insulate between inner casing air intake opening, gas outlet and external pipeline between inside and outside shell.
Compared with prior art, the beneficial effects of the utility model are: this system can adopt the measurement that combines with the current ionization chamber method of ion-pulse ionization chamber method, and convenient switching the between two kinds of methods, range can cover the whole survey radon scope from high activity to ambient level, it is good to have long-time stability, accuracy and highly sensitive.
Description of drawings
Fig. 1 system architecture diagram
Fig. 2 ionization chamber structure cut-open view
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is described in further detail:
This system comprises sampling gas charging system 1, ionization chamber 2, ion pulse measuring and analysis system, current measurement analytic system, data analysis system 10, the gas charging system 1 of wherein sampling is connected with ionization chamber 2, described ionization chamber 2 is connected with ion pulse measuring and analysis system, current measurement analytic system by high resistant gating switch 3, and ion pulse measuring system, current measurement analytic system are connected with data analysis system 10.It is cylindrical that wherein said ionization chamber 2 is the bivalve, the sealing of shell 11 normal pressures, and inner casing 12 adds positive high voltage and passes through inner cap 19 vacuum seals it for stainless steel and by high pressure seat 16, and with 13 insulation of polyethylene insulation pad, screening can is an aluminium alloy between inside and outside shell.In order to alleviate the wall attachment effect of radon and font, inner casing 12 inside surfaces adopt electropolishing, make curved surfaces reach very high smoothness, have also reduced the scrambling of electric field simultaneously.Because ionization chamber 2 must be taken into account the measurement of impulse method and current method, and current method electrometer 8 is when measuring, pickup electrode is that center pole 17 must be a zero potential, therefore inner casing 12 is added with high pressure, and external metal loading line can not be with high pressure, so insulate between air intake opening 14, gas outlet 15 employing ceramics insulators and metal solder and external pipeline, and center pole 17 is by insulator 18 and casing insulation, and in order to guarantee sealing, the output terminal of center pole 17 is equipped with shielding box.Described ion pulse measuring and analysis system comprises that prime amplifier 4, main amplifier 5, discriminator 6, single-chip microcomputer 7 connect to form successively, and described current measurement analytic system is connected to form by electrometer 8, gpib interface 9.
After at first will containing the radon sample and charge into ionization chamber 2 by sampled air system 1, gating switch 3 selects the amperometry systems to determine concentration range earlier.When the high concentration water adopts the current measurement analytic system at ordinary times, adopt the ion pulse measuring and analysis system to measure during ambient level.Be not subjected to the influence of pulse prime amplifier 4 when making ionization chamber 2 select weak currents to measure, gating switch 3 is connected on ionization chamber 2 center pole 17 output terminals.When the radon concentration that records is ambient level, utilize gating switch 3 to select the ion pulse measuring and analysis system, ion pulse signal by ionization chamber 2 outputs amplifies through prime amplifier 4 earlier, by cable input main amplifier 5, amplify the back is screened by discriminator 6 through being shaped, single-chip microcomputer 7 can scan mode detects from the signal of ionization chamber 2 and carries out pre-service, is sent to data analysis system 10 then.
Simultaneously in order to improve the accuracy of measurement, this system can adopt 4 cover ionization chambers 2 to be connected with ion pulse measuring and analysis system accordingly it is measured simultaneously.
Claims (5)
1. an ionization chamber is measured the system of radon concentration, it comprises sampling gas charging system (1), ionization chamber (2), the ion pulse measuring and analysis system, the current measurement analytic system, data analysis system (10), the gas charging system (1) of wherein sampling is connected with ionization chamber (2), ionization chamber (2) is connected with the ion pulse measuring and analysis system by high resistant gating switch (3), the ion pulse measuring and analysis system is connected with data analysis system again, and described ion pulse measuring and analysis system comprises prime amplifier (4), main amplifier (5), discriminator (6), single-chip microcomputer (7) connects to form successively; Described current measurement analytic system is connected to form by electrometer (8), gpib interface (9), it is characterized in that, also is connected with the current measurement analytic system by high resistant gating switch (3) between described ionization chamber (2) and the data analysis system (10).
2. ionization chamber according to claim 1 is measured the system of radon concentration, it is characterized in that, it is cylindrical that described ionization chamber (2) is the bivalve, the sealing of shell (11) normal pressure, inner casing (12) is for stainless steel and add positive high voltage and vacuum seal, insulation is insulated between inner casing (12) air intake opening (14), gas outlet (15) and external pipeline between inside and outside shell (11,12).
3. ionization chamber according to claim 2 is measured the system of radon concentration, it is characterized in that the inside surface electropolishing of described inner casing (12).
4. ionization chamber according to claim 1 and 2 is measured the system of radon concentration, it is characterized in that, described ionization chamber (2) is composed in parallel by 4 covers.
5. ionization chamber according to claim 2 is measured the system of radon concentration, it is characterized in that, described air intake opening (14), gas outlet (15) are formed for the ceramics insulator metal solder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200055288U CN201173909Y (en) | 2008-03-05 | 2008-03-05 | System of ion-pulse ionization chamber for measuring radon concentration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200055288U CN201173909Y (en) | 2008-03-05 | 2008-03-05 | System of ion-pulse ionization chamber for measuring radon concentration |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201173909Y true CN201173909Y (en) | 2008-12-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200055288U Expired - Lifetime CN201173909Y (en) | 2008-03-05 | 2008-03-05 | System of ion-pulse ionization chamber for measuring radon concentration |
Country Status (1)
| Country | Link |
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| CN (1) | CN201173909Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103969674A (en) * | 2013-01-31 | 2014-08-06 | 通用电气公司 | Radiation monitor, and method for measuring current through flow through electrometer of radiation monitor |
| CN104570038A (en) * | 2014-12-30 | 2015-04-29 | 中国原子能科学研究院 | Method and device for quickly measuring radon concentration |
| CN107121488A (en) * | 2017-04-28 | 2017-09-01 | 浙江大学 | Gas phase alkali metal on-line measurement device in a kind of coal-fired flue-gas |
| CN107402251A (en) * | 2016-05-20 | 2017-11-28 | 泰拉能源公司 | Sodium caesium ionization detector |
| CN109490936A (en) * | 2018-12-28 | 2019-03-19 | 西安中核核仪器有限公司 | Integrate the γ radiation chamber detection system and method for low energy type and high energy type |
-
2008
- 2008-03-05 CN CNU2008200055288U patent/CN201173909Y/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103969674A (en) * | 2013-01-31 | 2014-08-06 | 通用电气公司 | Radiation monitor, and method for measuring current through flow through electrometer of radiation monitor |
| CN103969674B (en) * | 2013-01-31 | 2018-05-11 | 通用电气公司 | The method of radiation monitor and the electrometer measurement electric current for passing through radiation monitor |
| CN104570038A (en) * | 2014-12-30 | 2015-04-29 | 中国原子能科学研究院 | Method and device for quickly measuring radon concentration |
| CN104570038B (en) * | 2014-12-30 | 2017-07-14 | 中国原子能科学研究院 | A kind of method and device of quick measurement radon consistence |
| CN107402251A (en) * | 2016-05-20 | 2017-11-28 | 泰拉能源公司 | Sodium caesium ionization detector |
| CN107402251B (en) * | 2016-05-20 | 2022-05-13 | 泰拉能源公司 | Sodium-cesium ionization detector |
| CN107121488A (en) * | 2017-04-28 | 2017-09-01 | 浙江大学 | Gas phase alkali metal on-line measurement device in a kind of coal-fired flue-gas |
| CN107121488B (en) * | 2017-04-28 | 2019-09-03 | 浙江大学 | Gas phase alkali metal on-line measurement device in a kind of coal-fired flue-gas |
| CN109490936A (en) * | 2018-12-28 | 2019-03-19 | 西安中核核仪器有限公司 | Integrate the γ radiation chamber detection system and method for low energy type and high energy type |
| CN109490936B (en) * | 2018-12-28 | 2023-08-18 | 西安中核核仪器股份有限公司 | Gamma radiation ionization chamber detection system and method integrating low energy type and high energy type |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20081231 |