CN108828649B - For3Filling test device developed and improved by He proportional counter and implementation method - Google Patents
For3Filling test device developed and improved by He proportional counter and implementation method Download PDFInfo
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- CN108828649B CN108828649B CN201810529284.1A CN201810529284A CN108828649B CN 108828649 B CN108828649 B CN 108828649B CN 201810529284 A CN201810529284 A CN 201810529284A CN 108828649 B CN108828649 B CN 108828649B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T3/00—Measuring neutron radiation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T7/00—Details of radiation-measuring instruments
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Abstract
The invention discloses a method for3He proportional counter development and improved filling test device and its implementation method. The device comprises a mechanical pump, a molecular pump, an electromagnetic valve, a pump body and a pump body which are connected in sequence through pipelines,3He proportional counter device,3He air supply unit and filling device wrap up on the pipeline and are used for baking the pipeline heating band that dehumidifies the gas in the pipeline, install the first thermometer that is used for detecting the pipeline temperature on the pipeline. Through the scheme, the invention has the advantages of reasonable design, convenient operation and high safety, and can realize accurate and quick operation3Atmosphere filling of He proportional counter with different components and different proportions for developing long plateau, quick response and accurate measurement3The He proportional counter provides a good test environment and has high practical value and popularization value.
Description
Technical Field
The invention relates to a method for3He proportional counter development and improved filling test device and its implementation method.
Background
The neutrons are not charged and cannot directly cause ionization and excitation of substances, and the detection of the neutrons is mainly realized by secondary charged particles generated by the action of the neutrons and the substancesIs detected.3He tube is a gas detector, also called a gas detector3He proportional counters have a higher reaction cross-section than other detectors, and3the atmosphere in the He tube is3The primary technical difficulty of the stable operation of the He proportional counter is that3He gas is precious and the accurate proportion of He gas and other mixed gas is realized, and the prior filling technology usually adopts a large amount of filling3He gas is premixed with other gases and then filled into3He proportional counter tube wastes a large amount of water3He gas is used as the premise for filling test, a corresponding high-pressure gas mixing device is required, and the method is suitable for the gas filling test after the optimal formula of the gas is determined3He proportional counter development and improvement tests are too wasteful and cumbersome.
Disclosure of Invention
The invention aims to provide a method for3A filling test device developed and improved by a He proportional counter and an implementation method thereof mainly solve the problems existing in the prior art3He proportional counter development and improvement of the filling experiment of the test device are relatively complex problems.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
is used for3The filling test device developed and improved by the He proportional counter comprises a mechanical pump, a molecular pump, an electromagnetic valve and a controller which are connected in sequence through pipelines,3He proportional counter device,3The device comprises a He gas source device, a filling device, a pipeline heating belt and a first thermometer, wherein the pipeline heating belt is wrapped on a pipeline and used for baking and dehumidifying gas in the pipeline;
the above-mentioned3He proportional counter device comprises3He proportional counter simultaneously with3Connected to He proportional counter3He pipe valve and first pressure gauge, and3the He proportional counter is connected with a second thermometer for testing the temperature of the He proportional counter;
the above-mentioned3The He gas source device comprises3He gas source bottle, and3he gas source bottles are connected in sequence3He pressure reducing valve and gas source valve;
the filling device comprises a plurality of containers for storing3The He proportional counter provides other gas distribution bottles with different components, and a pressure reducing valve and a gas mixing valve which are matched with the gas distribution bottles;
wherein, with3Connected to He proportional counter3He pipe valve and a first pressure gauge are used for controlling the gas filling amount in the pipe, and an electromagnetic valve,3The He pipe valve, the gas source valve and the gas mixing valve are connected through pipelines.
Furthermore, a second pressure gauge for overvoltage protection is arranged between the molecular pump and the electromagnetic valve and is arranged between the electromagnetic valve and the electromagnetic valve3A stop valve between the He pipe valves, and a third pressure gauge for monitoring the pressure between the solenoid valve and the stop valve.
Preferably, a vacuum extraction valve is further connected between the gas source valve and the flow control valve.
Further, the implementation method of the device comprises the following steps:
(1) keeping all gas cylinders and instruments closed, opening all flow control valves, opening a mechanical pump and an electromagnetic valve, starting a pipeline heating belt for baking and dehumidifying, monitoring the heating temperature of the pipeline through a first thermometer, and monitoring the heating temperature of the pipeline through a second thermometer3He proportional counter heating temperature;
(2) closing the electromagnetic valve, opening the molecular pump to a stable rotation speed, then opening the electromagnetic valve, pumping the pipeline to low vacuum, then closing the stop valve,3Opening any gas distribution bottle to a certain pressure, closing the He pipe valve and the gas source valve, recording the gas pressure value of the first pressure gauge, closing the vacuum extraction valve, and opening3He pipe valve, recording the pressure value of the first pressure gauge again, and obtaining the volume sum of the pipelines from the stop valve to the vacuum extraction valve according to the following formula3Volume ratio k of He proportional counter tube volume:
in the formula, P1、P2The first recorded pressure value, V, of the first pressure gauge1Is the volume of the pipeline from the stop valve to the vacuum extraction valve, V2Is that3He is proportional to the volume of the counter tube;
(3) opening the stop valve and the vacuum extraction valve, extracting the pipeline to low vacuum degree, and determining3He proportional counter composition and ratio, required3He gas pressure is PHeThe pressure of the other mixed gas is PMixing ofThen closing flow valves in front of all gas distribution bottles, closing stop valves and vacuum extraction valves, and opening3He gas source bottle, slowly opening the gas source valve to make the first pressure meter reach a certain pressure value PnHeThen closing the gas supply valve, followed by closing3Opening the stop valve, pumping the pipeline to low vacuum, closing the stop valve, opening the vacuum pumping valve, and slowly opening the gas mixing valve of the corresponding gas distribution cylinder to make the first pressure gauge reach a certain pressure value Pn mixThen the vacuum air extraction valve and the air distribution bottle are closed, and then the air distribution bottle is opened3He pipe valve, let3He gas and mixed gas in3The mixture in He tube is mixed uniformly, and the corresponding P can be calculated by the following formulanHeAnd Pn mix：
In the formula, PHeAnd PnHeRespectively in mixed gas3Pressure of He gas and desired fill pressure, PMixing ofAnd Pn mixThe pressure of the mixer in the mixed gas and the required filling pressure are respectively;
(4) close off3He pipe valve, opening stop valve and vacuum air extraction valve, after pumping pipeline to low vacuum, closing stop valve, vacuum air extraction valve and air mixing valve, then closing molecular pump, electromagnetic valve and mechanical pump in turn, and taking down3He proportional counter.
Specifically, in the step, the pipeline heating belt is not aligned3And heating the He gas source bottle.
Compared with the prior art, the invention has the following beneficial effects:
(1) the heating belt is managed to carry out baking and dehumidification, so that the influence of residual air and water vapor in the pipeline on the experiment is avoided, meanwhile, the filling system is prepared for use in a high-temperature environment, and the filling system is used3He gas source bottle and other gas distribution bottles are separately arranged and are used for distributing gas according to actual requirements3He gas and other gases are filled into the reactor3In He proportional counter, thus3The development of the He proportional counter provides a convenient, quick and accurate multi-gas mixed filling test environment.
(2) The invention is in3The front ends of the He gas source bottle and the gas distribution bottles are provided with corresponding valves, so that the energy is saved3On the premise of He gas, avoid3The residual gas in the He gas source bottle is polluted, different gases are filled into the gas distribution bottle, uniform mixing of multiple gases can be achieved, protective gas can be mixed in the gas distribution bottle in advance, and mixing of multiple gases can be achieved through the partial pressure law in combination with a mode of multiple pumping and injecting.
(3) The calculation method is simple and reasonable, has higher accuracy, is easy to modify and simple and convenient to operate, can replace and adjust the number of the gas distribution bottles and the gas of the gas distribution bottles according to requirements, can realize semi-automatic or full-automatic filling control by replacing corresponding valves and combining a PC control technology, is convenient and quick, and even can realize batch production.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
FIG. 2 is a schematic diagram showing the neutron test plateau curve result of the pilot-produced He-3 tube of the present invention.
In the drawings, the names of the parts corresponding to the reference numerals are as follows:
1-mechanical pump, 2-molecular pump, 3-electromagnetic valve, 4-pipeline heating zone, 5-first thermometer, 6-3He proportional counter, 7-3He pipe valve, 8-first pressure gauge, 9-3He gas source bottle, 10-3He pressure reducing valve, 11 gas source valve, 12-gas distribution bottle, 13-pressure reducing valve, 14-gas mixing valve and 15-second pressure gauge16-a stop valve, 17-a third pressure gauge, 18-a second thermometer and 19-a vacuum extraction valve.
Detailed Description
The present invention is further illustrated by the following figures and examples, which include, but are not limited to, the following examples.
Examples
As shown in fig. 1 and 2, a method for3The filling test device developed and improved by the He proportional counter comprises a mechanical pump 1, a molecular pump 2, an electromagnetic valve 3,3He proportional counter device,3The device comprises a He gas source device, a filling device, a pipeline heating belt 4 and a first thermometer 5, wherein the pipeline heating belt 4 is wrapped on a pipeline and used for baking and dehumidifying gas in the pipeline, and the first thermometer 5 is arranged on the pipeline and used for detecting the temperature of the pipeline; the above-mentioned3He proportional counter device comprises3He proportional counter 6 simultaneously with3He proportional counter 6 connected3A He pipe valve 7 and a first pressure gauge 8; the above-mentioned3The He gas source device comprises3He gas source bottle 9, and3he gas source bottles 9 connected in sequence3He pressure reducing valve 10 and gas source valve 11; the filling device comprises a plurality of containers for storing3The He proportional counter 5 provides other gas distribution bottles 12 with different components, and a pressure reducing valve 13 and a gas mixing valve 14 which are matched with the gas distribution bottles 12;
wherein, with3He proportional counter 6 connected3The He pipe valve 7 and the first pressure gauge 8 are used for controlling the gas charging amount in the pipe, and3the He pipe valve 7, the gas source valve 11 and the gas mixing valve 14 are connected through pipelines.
And a second pressure gauge 15 for overvoltage protection is arranged between the molecular pump 2 and the electromagnetic valve 3 and is arranged between the electromagnetic valve 3 and the electromagnetic valve 33 A stop valve 16 between the He pipe valve 7, and a third pressure gauge 17 for monitoring the pressure between the solenoid valve 3 and the stop valve 16; the above-mentioned3The He proportional counter 6 is externally connected with a second thermometer 18 for testing the temperature of the He proportional counter; a vacuum pumping valve 19 is further connected between the air source valve 11 and the flow control valve 14, wherein the vacuum pumping valve 19 is used for secondary protection of the air source on one hand and is used for secondary protection of the air source on the other handReduced contamination of pre-provenance lines during subsequent gas fills while reducing3He gas is wasted.
The invention combines the ideal gas state equation and the Dalton partial pressure law3He proportional counter tube is filled as follows:
firstly, keeping all gas cylinders and instruments closed, opening all flow control valves, opening a mechanical pump and an electromagnetic valve, starting a pipeline heating belt 4, monitoring the heating temperature through a first thermometer 5, generally 110 ℃, and connecting pipelines and instruments3And (5) He is directly proportional to the count of 6, baking and dehumidifying are carried out, and the first baking is carried out for at least 12 h.
Then, the electromagnetic valve 3 is closed, the molecular pump 2 is started to a stable rotating speed, then the electromagnetic valve 3 is restarted, and the pipeline is pumped to a low vacuum such as 10-5Pa, the default pressure is low, the pipeline only contains trace impurity gas, and then the stop valve 16 is closed,3He pipe valve 7 and gas source valve 11, opening any gas distribution bottle 12 to one atmosphere, closing gas distribution bottle 12, and recording gas pressure value P of first pressure gauge 81After 0.1MPa, the vacuum suction valve 19 is closed and opened3He pipe valve 7 for filling gas3The He proportional counter 6 is arranged in the tube body, the air pressure value of the first pressure gauge 8 is recorded again, and the assumed air pressure value is P2The pipe volume V between the stop valve 16 and the vacuum suction valve 19 can be obtained according to the ideal gas state equation PV equal to nRT equal to 0.02MPa1And3volume V of 6 tubes of He proportional counter2Volume ratio k:
P1V1＝P2(V1+V2)
subsequently, the shut-off valve 16 and the vacuum suction valve 19 are opened and the line is drawn to 10-5Pa, determining3He proportional counter 6 comprises the following components and proportions:3he gas and ultra-high purity Ar2Mixed gas of (2), required3He gas pressure is PHe0.1MPa, requiredUltra-high purity Ar2Pressure of PMixing ofClosing all flow valves before the gas distribution 12 under 0.3MPa, closing the stop valve 16 and the vacuum air extraction valve 19, and opening3He gas source bottle 9, slowly opening the gas source valve 11 to make the first pressure gauge 8 reach a certain pressure value PnHeThen closing the gas supply valve 11, followed by closing3He pipe valve 7, opening stop valve 16, pumping pipeline to 10-5Pa, then the stop valve 16 is closed, the vacuum extraction valve 19 is opened, and Ar is slowly opened2The gas mixing valve 14 of the gas distribution bottle 12 enables the first pressure gauge 8 to reach a certain pressure value Pn mixThen the vacuum air extraction valve 19 and the air distribution bottle 12 are closed, and then the air distribution bottle is opened3He pipe valve 7 is held for 1h to let3He gas and mixed gas in3Mixing in He tube, wherein the pressure of filled gas is PnHeAnd Pn mixCan be calculated according to the formula:
correspondingly, if filled with Ar first2Post filling3He gas, corresponding to P to be filledn mixIs 0.125MPa, and3he gas is 1.5MPa, the total gas amount required is constant, and the filling effect is the same.
Finally, close3Opening the stop valve 16 and the vacuum extraction valve 19 of the He pipe valve 7, pumping the pipeline to 0.5Pa, closing the stop valve 16, the vacuum extraction valve 19 and the gas mixing valve 14, then closing the molecular pump 2, the electromagnetic valve 3 and the mechanical pump 1 in sequence, and taking down3The He proportional counter 6 performs subsequent electrical property measurements.
The invention combines the functions of building a pipeline systemThink of gas equation of state and dalton partial pressure law, realize3The He proportional counter tube body can be quickly filled with atmospheres with different formulas and different proportions, the system is simple and convenient to operate, easy to modify, simple and reasonable in calculation method, high in accuracy, and very suitable for being used for3He proportional counter development and formula optimization, and semi-automatic or full-automatic batch production3He proportional counter provides a simple and reliable operating system.
The above embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, but all changes that can be made by applying the principles of the present invention and performing non-inventive work on the basis of the principles shall fall within the scope of the present invention.
Claims (5)
1. Is used for3A filling test device developed and improved by a He proportional counter is characterized by comprising a mechanical pump (1), a molecular pump (2), an electromagnetic valve (3) and a controller, wherein the mechanical pump, the molecular pump and the electromagnetic valve are sequentially connected through a pipeline,3He proportional counter device,3The device comprises a He gas source device, a filling device, a pipeline heating belt (4) wrapped on a pipeline and used for baking and dehumidifying gas in the pipeline, and a first thermometer (5) arranged on the pipeline and used for detecting the temperature of the pipeline;
the above-mentioned3He proportional counter device comprises3He proportional counter (6) simultaneously with3He proportional counter (6) connected3He pipe valve (7) and a first pressure gauge (8), and3a second thermometer (18) connected to the He proportional counter (6) and used for measuring the temperature thereof;
the above-mentioned3The He gas source device comprises3He gas source bottle (9), and3he gas source bottles (9) connected in sequence3A He pressure reducing valve (10) and a gas source valve (11);
the filling device comprises a plurality of containers for storing3The He proportional counter (6) provides gas distribution bottles (12) with different compositions, and a pressure reducing valve (13) and a gas mixing valve (14) which are matched with the gas distribution bottles (12);
wherein, with3He proportional counter (6) connected3He pipe valve (7) and a first pressure gauge (8)Is used for controlling the gas filling amount in the pipe and comprises an electromagnetic valve (3),3The He pipe valve (7), the gas source valve (11) and the gas mixing valve (14) are connected through pipelines.
2. A method according to claim 13He proportional counter development and improved filling test device is characterized in that a second pressure gauge (15) for overpressure protection is arranged between the molecular pump (2) and the electromagnetic valve (3), and is arranged between the electromagnetic valve (3) and the electromagnetic valve (3)3A stop valve (16) between the He pipe valves (7), and a third pressure gauge (17) for monitoring the pressure between the solenoid valve (3) and the stop valve (16).
3. A method according to claim 23The filling test device developed and improved by the He proportional counter is characterized in that a vacuum extraction valve (19) is further connected between the gas source valve (11) and the gas mixing valve (14).
4. The method of claim 3, comprising the steps of:
(1) keeping all gas cylinders and instruments closed, opening all flow control valves, opening a mechanical pump and an electromagnetic valve, starting a pipeline heating belt for baking and dehumidifying, monitoring the heating temperature of the pipeline through a first thermometer, and monitoring the heating temperature of the pipeline through a second thermometer3He proportional counter heating temperature;
(2) closing the electromagnetic valve, opening the molecular pump to a stable rotation speed, then opening the electromagnetic valve, pumping the pipeline to low vacuum, then closing the stop valve,3Opening any gas distribution bottle to a certain pressure, closing the He pipe valve and the gas source valve, recording the gas pressure value of the first pressure gauge, closing the vacuum extraction valve, and opening3He pipe valve, recording the pressure value of the first pressure gauge again, and obtaining the volume sum of the pipelines from the stop valve to the vacuum extraction valve according to the following formula3Volume ratio k of He proportional counter tube volume:
in the formula, P1、P2The first recorded pressure value, V, of the first pressure gauge1Is the volume of the pipeline from the stop valve to the vacuum extraction valve, V2Is that3He is proportional to the volume of the counter tube;
(3) opening the stop valve and the vacuum extraction valve, extracting the pipeline to low vacuum degree, and determining3He proportional counter composition and ratio, required3He gas pressure is PHeThe pressure of the other mixed gas is PMixing ofThen closing the gas mixing valves in front of all the gas distribution bottles, closing the stop valves and the vacuum extraction valves, and opening3He gas source bottle, slowly opening the gas source valve to make the first pressure meter reach a certain pressure value PnHeThen closing the gas supply valve, followed by closing3Opening the stop valve, pumping the pipeline to low vacuum, closing the stop valve, opening the vacuum pumping valve, and slowly opening the gas mixing valve of the corresponding gas distribution cylinder to make the first pressure gauge reach a certain pressure value Pn mixThen the vacuum air extraction valve and the air distribution bottle are closed, and then the air distribution bottle is opened3He pipe valve, let3He gas and mixed gas in3The mixture in He tube is mixed uniformly, and the corresponding P can be calculated by the following formulanHeAnd Pn mix：
In the formula, PHeAnd PnHeRespectively in mixed gas3Pressure of He gas and desired fill pressure, PMixing ofAnd Pn mixRespectively the pressure of the mixed gas and the required filling pressure;
(4) close off3He pipe valve, opening stop valve and vacuum air extraction valve, after pumping pipeline to low vacuum, closing stop valve, vacuum air extraction valve and air mixing valve, then closing molecular pump, electromagnetic valve and mechanical pump in turn, and taking down3He proportional counter.
5. The method of claim 4, wherein in step (1), the heating band of the pipeline is not aligned3And heating the He gas source bottle.
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| CN201810529284.1A CN108828649B (en) | 2018-05-26 | 2018-05-26 | For3Filling test device developed and improved by He proportional counter and implementation method |
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| CN201810529284.1A CN108828649B (en) | 2018-05-26 | 2018-05-26 | For3Filling test device developed and improved by He proportional counter and implementation method |
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| CN108828649B true CN108828649B (en) | 2021-07-23 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3221081A1 (en) * | 1982-06-04 | 1983-12-08 | Herfurth Gmbh, 2000 Hamburg | Arrangement for reducing the counter gas consumption of large-area proportional counters |
| JPS59105589A (en) * | 1982-12-08 | 1984-06-18 | Mitsubishi Electric Corp | Apparatus for filling counter with bf3-gas |
| JPS59125087A (en) * | 1982-12-30 | 1984-07-19 | Fuji Electric Co Ltd | Radiant ray detecting device |
| GB2468474A (en) * | 2008-12-09 | 2010-09-15 | Thermo Electron Mfg Ltd | Beta radiation monitor |
-
2018
- 2018-05-26 CN CN201810529284.1A patent/CN108828649B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3221081A1 (en) * | 1982-06-04 | 1983-12-08 | Herfurth Gmbh, 2000 Hamburg | Arrangement for reducing the counter gas consumption of large-area proportional counters |
| JPS59105589A (en) * | 1982-12-08 | 1984-06-18 | Mitsubishi Electric Corp | Apparatus for filling counter with bf3-gas |
| JPS59125087A (en) * | 1982-12-30 | 1984-07-19 | Fuji Electric Co Ltd | Radiant ray detecting device |
| GB2468474A (en) * | 2008-12-09 | 2010-09-15 | Thermo Electron Mfg Ltd | Beta radiation monitor |
Non-Patent Citations (2)
| Title |
|---|
| 3He正比计数管的充气系统;喻金火 等;《原子能科学技术》;19811231(第4期);第460-463页 * |
| 三氟化硼正比计数管;施散士;《原子能科学技术》;19611231(第1期);第48-52页 * |
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