CN203224633U - Novel environmental Gamma monitor having high response speed and provided with high-air-pressure ionization chamber - Google Patents
Novel environmental Gamma monitor having high response speed and provided with high-air-pressure ionization chamber Download PDFInfo
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- CN203224633U CN203224633U CN 201320269899 CN201320269899U CN203224633U CN 203224633 U CN203224633 U CN 203224633U CN 201320269899 CN201320269899 CN 201320269899 CN 201320269899 U CN201320269899 U CN 201320269899U CN 203224633 U CN203224633 U CN 203224633U
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Abstract
The utility model provides a novel environmental Gamma monitor having high response speed and provided with a high-air-pressure ionization chamber. The novel environmental Gamma monitor having high response speed and provided with the high-air-pressure ionization chamber includes the high-air-pressure ionization chamber, an I/V converting circuit and a data collecting and processing system. The high-air-pressure ionization chamber includes a ball-shaped metal shell and a collecting electrode disposed in the ball-shaped metal shell. The ball-shaped metal shell is filled with high-pressure pure Ar gas and is connected with negative high pressure power source electrically. A connection wire of the collecting electrode is penetrated through the ball-shaped metal shell and is connected to the data collecting and processing system through an AC removing device and the I/V converting circuit successively. The response speed of the novel environmental Gamma monitor having high response speed and provided with the high-air-pressure ionization chamber is the highest (less than 5 seconds) at home and abroad currently. The novel environmental Gamma monitor having high response speed and provided with the high-air-pressure ionization chamber can be applied to environmental Gamma monitoring of large-size nuclear facilities such as reactor nuclear power station and the like. When Gamma radiation level in the surrounding environment of the nuclear facilities changes, an alarm signal can be given out by the response speed of the novel environmental Gamma monitor having high response speed and provided with the high-air-pressure ionization chamber within 5 seconds and accident character can be determined, so that (public) radiation safety of the surrounding environment can be guaranteed.
Description
Technical field
The utility model relates to the environs radiation monitoring technical field, especially relates to a kind of novel fast-response time high-pressure ionization chamber's environment γ monitor.
Background technology
Along with the Nuclear Science and Technology fast development, the construction of reactor nuclear power station and large-scale nuclear facilities is increasing, produces γ radiation and other type of radiation and radioactivity in its surrounding environment environment is polluted.Surrounding environment γ radiation level under the normal operation of monitoring nuclear power station and other nuclear facilities and the accident condition; guarantee that environmental radiation is safely very necessary; particularly the fast-response time of monitor can in time be found the variation of environment γ radiation level, and accident condition is sent warning.
The response time of the at present domestic and international environment γ of high-pressure ionization chamber monitor, it was fast how to reach the response time, can ensure that again the discreteness under the low dosage level is little all greater than 30 seconds, and this is the problem that the utility model solves.
The utility model content
The purpose of this utility model is to design a kind of novel novel fast-response time high-pressure ionization chamber's environment γ monitor, addresses the above problem.
To achieve these goals, the technical solution adopted in the utility model is as follows:
A kind of novel fast-response time high-pressure ionization chamber's environment γ monitor, comprise high-pressure ionization chamber, I/V change-over circuit and data Collection ﹠ Processing System, described high-pressure ionization chamber comprises the spherical metal shell and is positioned at the passive electrode of described spherical metal shell; The pure Ar gas of the envelope filled high pressure of described spherical metal and be electrically connected with negative high voltage power source; Described passive electrode wiring passes described spherical metal shell and behind the past ac equipment, inserts described data Collection ﹠ Processing System through described I/V change-over circuit again.
The diameter of described spherical metal shell is Φ 250mm, in fill 25 pure Ar gases of atmospheric pressure, described passive electrode is Φ 5mm spherical, the operating voltage of described negative high voltage power source is-800V.
Described I/V change-over circuit comprises two groups of high input impedance operational amplifiers that working current is one high and one low, described two groups of high input impedance operational amplifier parallel connections.
Described data Collection ﹠ Processing System comprises A/D converter unit and single card microcomputer, described passive electrode wiring passes described spherical metal shell and behind the past ac equipment, inserts described single card microcomputer behind the described I/V change-over circuit of process and the described A/D converter unit successively again.
Described spherical metal shell is stainless steel casing.
I/V change-over circuit in the utility model, i.e. current-voltage conversion circuit; A/D converter unit, i.e. analog-to-digital conversion unit.
The so-called high input impedance operational amplifier of the utility model, its input impedance is greater than 10
15Ω.
For participating in the environment γ of the high-pressure ionization chamber monitor performance expert group test of national environmental protection nuclear safety department tissue, development the utility model.Six suppliers and factory inside and outside 2008 year end organizing nations of national environmental protection nuclear safety department, seven the environment γ of model high-pressure ionization chamber monitors, entrust Zhejiang Province's radiation environment monitoring station, units such as radiation safety research department of China Atomic Energy Science Research Institute and defense-related science, technology and industry ionising radiation one-level test satellite location, to above-mentioned seven the environment γ of model high-pressure ionization chamber monitors, tested by expert group.
The beneficial effects of the utility model can be summarized as follows:
1, the utility model is the environment γ monitor of at present domestic and international response time the fastest (less than 5 seconds).Can be used for large-scale nuclear facilities environment gamma radiation monitorings such as reactor nuclear power station.When nuclear facilities surrounding environment γ radiation level changes, providing alerting signal less than 5 seconds monitoring in time devices, determine nature of occurence, guarantee surrounding environment (public) radiation safety.
2, the utility model adopts I-V varying circuit and rapid data collection and processing software and hardware, realizes that monitor changes the fast-response time (less than 5 seconds) to gamma radiation field.
Description of drawings
Fig. 1 is cross-sectional view of the present utility model.
Fig. 2 is the change curve synoptic diagram of the utility model response time test result.
Embodiment
Clearer for technical matters, technical scheme and beneficial effect that the utility model is solved, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explaining the utility model, and be not used in restriction the utility model.
A kind of novel fast-response time high-pressure ionization chamber's 1 environment γ monitor as shown in Figure 1, comprise high-pressure ionization chamber 1, I/V change-over circuit 2 and data Collection ﹠ Processing System 3, described high-pressure ionization chamber 1 comprises spherical metal shell 4 and is positioned at the passive electrode 5 of described spherical metal shell 4; Fill the pure Ar gas of high pressure in the described spherical metal shell 4 and be connected with negative high voltage power source electricity 6; Described passive electrode 5 wiring pass described spherical metal shell 4 and behind the past ac equipment, insert described data Collection ﹠ Processing System 3 through described I/V change-over circuit 2 again.
In a preferred embodiment, the diameter of described spherical metal shell 4 is Φ 250mm, in fill 25 pure Ar gases of atmospheric pressure, described passive electrode 5 is Φ 5mm spherical, the operating voltage of described negative high voltage power source is-800V.
In the embodiment that is more preferably, described I/V change-over circuit 2 comprises two groups of high input impedance operational amplifiers that working current is one high and one low, described two groups of high input impedance operational amplifier parallel connections.
In the embodiment that is more preferably, described data Collection ﹠ Processing System 3 comprises A/D converter unit 7 and single card microcomputer 8, described passive electrode 5 wiring pass described spherical metal shell 4 and behind the past ac equipment, insert described single card microcomputer 8 through described I/V change-over circuit 2 and described A/D converter unit 7 backs successively again.Described spherical metal shell 4 is stainless steel casing.
In certain specific embodiment:
The utility model comprises the spherical shell of a Φ 250mm stainless steel, in fill 25 pure Ar gases of atmospheric pressure, passive electrode 5 is Φ 5mm spherical as shown in Figure 1, operating voltage is-800V, be added on the outer spheroid, passive electrode 5 is that anode is connected with high input impedance operational amplifier, forms earth potential.
When gamma-rays incided on the spherical metal shell 4 of monitor, they and stainless steel wall and argon gas interacted and produce electronics, make argon gas atmo ionization.Passive electrode 5 is collected the electron production electric current, and size of current is directly proportional with incident photon quantity and energy.
When the γ radiation level is high, because negative ions is to the density height, " compound " phenomenon appears, make ionization chamber be in unsaturated state, make output current and incident photon dose rate produce nonlinear relationship, although described high-pressure ionization chamber 1 adopts the operating voltage height in design, the measure of the big grade of electric-force gradient must be to its non-linear correction.
Two I/V change-over circuits 2 can fluid drive; 16 A/D converter units 7 and single card microcomputer 8 carry out data acquisition and processing.
The following technology of taking the utility model has improved the environment γ of high-pressure ionization chamber monitor response time index.
(1) adopts the high resistant method, convert the ionization chamber output current to voltage (I-V conversion) Fig. 1;
(2) adopt rapid data collection and handle software and hardware (Fig. 1);
(3) take the ultrapurification power supply, realize that discreteness is little under the low dosage level.
Nuclear safety department of national environmental protection portion entrusts relevant department to organize expert group, utilizes domestic sophisticated equipment device, the discreteness under seven the environment γ of model high-pressure ionization chamber monitor response times and the low dosage is surveyed be the results are shown in Table 1 and Fig. 2
The table 1 monitor response time
Fig. 2 is dose rate R (nGy/h) T (second) change curve in time.Response time (Fig. 2) is with the response time of 137Cs γ check source test monitor, and being opened to appearance by natural background level to radioactive source, to stablize the radiation level demonstration time be 3 seconds, and duplicate test repeatedly confirms that its response time is 3 seconds.From the response curve of multiple switching source procedure, through repeatedly the lifting source is to the test of monitor, its stability and response performance performance are good as can be seen.
More than by the detailed description of concrete and preferred embodiment the utility model; but those skilled in the art should be understood that; the utility model is not limited to the above embodiment; all within spirit of the present utility model and principle; any modification of doing, be equal to replacement etc., all should be included within the protection domain of the present utility model.
Claims (5)
1. novel fast-response time high-pressure ionization chamber's environment γ monitor, it is characterized in that, comprise high-pressure ionization chamber, I/V change-over circuit and data Collection ﹠ Processing System, described high-pressure ionization chamber comprises the spherical metal shell and is positioned at the passive electrode of described spherical metal shell; The pure Ar gas of the envelope filled high pressure of described spherical metal and be electrically connected with negative high voltage power source; Described passive electrode wiring passes described spherical metal shell and behind the past ac equipment, inserts described data Collection ﹠ Processing System through described I/V change-over circuit again.
2. novel fast-response time high-pressure ionization chamber's environment γ monitor according to claim 1, it is characterized in that: the diameter of described spherical metal shell is Φ 250mm, in fill 25 pure Ar gases of atmospheric pressure, described passive electrode is Φ 5mm spherical, and the operating voltage of described negative high voltage power source is-800V.
3. novel fast-response time high-pressure ionization chamber's environment γ monitor according to claim 1, it is characterized in that: described I/V change-over circuit comprises two groups of high input impedance operational amplifiers that working current is one high and one low, described two groups of high input impedance operational amplifier parallel connections.
4. novel fast-response time high-pressure ionization chamber's environment γ monitor according to claim 1, it is characterized in that: described data Collection ﹠ Processing System comprises A/D converter unit and single card microcomputer, described passive electrode wiring passes described spherical metal shell and behind the past ac equipment, inserts described single card microcomputer behind the described I/V change-over circuit of process and the described A/D converter unit successively again.
5. novel fast-response time high-pressure ionization chamber's environment γ monitor according to claim 1, it is characterized in that: described spherical metal shell is stainless steel casing.
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| CN 201320269899 CN203224633U (en) | 2013-05-17 | 2013-05-17 | Novel environmental Gamma monitor having high response speed and provided with high-air-pressure ionization chamber |
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| CN 201320269899 CN203224633U (en) | 2013-05-17 | 2013-05-17 | Novel environmental Gamma monitor having high response speed and provided with high-air-pressure ionization chamber |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107195347A (en) * | 2017-06-23 | 2017-09-22 | 中国核动力研究设计院 | It is a kind of to calibrate the method that heap outer core surveys ionisation chamber |
| CN108562931A (en) * | 2018-02-02 | 2018-09-21 | 中国原子能科学研究院 | A kind of energy compensating type Neutron Ambient Dose Equivalent secondary standard ionisation chamber |
-
2013
- 2013-05-17 CN CN 201320269899 patent/CN203224633U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107195347A (en) * | 2017-06-23 | 2017-09-22 | 中国核动力研究设计院 | It is a kind of to calibrate the method that heap outer core surveys ionisation chamber |
| CN108562931A (en) * | 2018-02-02 | 2018-09-21 | 中国原子能科学研究院 | A kind of energy compensating type Neutron Ambient Dose Equivalent secondary standard ionisation chamber |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131002 Termination date: 20140517 |