CN100371737C - Method of detecting radon and its daughter alpha energy spectrum using atmospheric air pulse ionization chamber - Google Patents
Method of detecting radon and its daughter alpha energy spectrum using atmospheric air pulse ionization chamber Download PDFInfo
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- CN100371737C CN100371737C CNB200510022380XA CN200510022380A CN100371737C CN 100371737 C CN100371737 C CN 100371737C CN B200510022380X A CNB200510022380X A CN B200510022380XA CN 200510022380 A CN200510022380 A CN 200510022380A CN 100371737 C CN100371737 C CN 100371737C
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Abstract
The present invention relates to a method for detecting radon and a radon daughter alpha energy spectrum by using a normal atmospheric air pulse ionization chamber, which is composed of the normal atmospheric air pulse ionization chamber and a charge sensitive amplifier. The present invention is characterized in that the normal atmospheric air pulse ionization chamber is a seal cavity body; detected radon gas enters the cavity body by a communicated gas nozzle; a superior conducting body collecting electrode 3 is fixed in the cavity body; signals which are collected and outputted by the superior conducting body collecting electrode 3 are directly coupled on the input end of the charge sensitive amplifier and are outputted after amplified by the charge sensitive amplifier; voltage pulse signals with amplitudes directly proportional to the energy of incoming alpha particles, which are generated by the output end, are connected to a multichannel pulse amplitude analytical instrument; the alpha energy spectrum of the radon can be detected.
Description
Technical field
The present invention relates to a kind of nuclear radiation detection amount technology, particularly a kind of method of surveying radon and daughter alpha energy spectrum thereof with using atmospheric air pulse ionization chamber.
Technical background
Prior art adopts using atmospheric air pulse ionization chamber as radon at present, and the detector of daughter can only be used for the total amount measurement of radon and daughter thereof, measure and can not be used for alpha energy spectrum, thereby adopt this class detector can accurately not measure the content of Rn-222 and Rn-220 in the measurand, thereby seriously limited the research of radon and daughter thereof and further explored as the measurement mechanism of radon and daughter thereof.
The scientific theory of any subject and science and technology development, all will by the science data of means of testing and have anti-in measuring technology development and develop, can be true and eloquent confirm the correctness of scientific theory and science and technology.The measuring technique development and progress is the pioneer of the application of all scientific theory development and science and technology thus, also is the pioneer that science and technology is converted into yield-power, is directly restriction or the important means of supporting development in science and technology.
Summary of the invention
The present invention seeks to disclose a kind of employing charge amplifier combines with using atmospheric air pulse ionization chamber, constituted the device that radon and daughter alpha energy spectrum thereof are measured, the detection sensitive volume that it had both inherited the ionization chamber detector is big, cost is low, etc. characteristics, have the function that alpha energy spectrum is measured again, having solved present using atmospheric air pulse ionization chamber can not be as the problem of radon and daughter alpha energy spectrum measurement thereof.
In order to reach the foregoing invention purpose, the technical scheme that is adopted is:
Using atmospheric air pulse ionization chamber of the present invention be an airtight cavity, with the sealing ionization chamber is core, the radgas sample enters high-field electrode 1 cavity of ionization chamber by exsiccator, the gaseous sample outlet is communicated with the radgas sample by the sealing air pump more again, forms the circulation of sealing gas circuit; The cavity internal fixation has an excellence conductor passive electrode 3, the input end (SIN_IN) that the signal output of passive electrode 3 directly is coupling in charge-sensitive preamplifier connects, linear amplification and pulse modulate circuit produce the voltage pulse signal that amplitude is directly proportional with the incident alpha-particle energy, after being connected with multichannel pulse size analyzer is single-phase behind the output terminal (SIN_OUT), can record the α spectrum of radon.Single-chip microcomputer with responsible data acquisition, control, storage, demonstration, telecommunications and data processing is connected again, at last by connector and two-way connection of computing machine (PC).As shown in Figure 1.
The present invention is mainly by using atmospheric air pulse ionization chamber, be connected to form with charge sensitive amplifier circuit two parts, described ionization chamber adopts cylindric using atmospheric air pulse ionization chamber, be fixed on the central authorities that the end one end is arranged on the high-field electrode 1 by good conductor passive electrode 3, between high-field electrode 1 and good conductor passive electrode 3, insulation course arranged; There are two insulation valves 2 to be communicated with formation with high-field electrode 1 inner chamber, two valves, one-in-and-one-out is used to be communicated with tested radon gas.As shown in Figure 2.
Described have insulation course and metal coating ring to be meant between high-field electrode 1 and good conductor passive electrode 3: metal coating ring 9 passes high-field electrode 1, and insulation protection overcoat 8 hard-pressed bales wrap good conductor passive electrode 3, pass metal coating ring 9 again; Metal nuts 6 is spun on the metal coating ring 9, near end cap 10.Shown in Fig. 2,3.Opening end has door closure 12, insulcrete 11 is arranged on the door closure and be fixed with handle 13.As shown in Figure 3.
Described charge sensitive amplifier circuit, it is made of charge-sensitive level and amplification output stage two parts: first is the charge-sensitive level, and charge signal is converted to voltage amplitude output, and realizes the function that charge-sensitive amplifies.This one-level is made of mode and low noise, the wide band amplifier AD8066 of low noise high frequency technotron with common-source amplifier, has characteristics such as input impedance height, noise is low, response is good.In the charge-sensitive level, field effect transistor Q1 and resistance R 5 have constituted the load of constant current source as field effect transistor Q2, because the internal resistance of constant current source is very big, have so just improved the gain of the common-source amplifier of Q1, Q2 formation greatly.The in-phase input end of an operational amplifier U1 among the drain electrode of Q2 and the AD8066 mutually
Pulse signal is amplified in connection.Second portion is to amplify output stage, in order to potential pulse is further amplified, is made of another operational amplifier U2 among the AD8066.R11 is that the resistance that manys littler than R12 links to each other it with homophase, the end of oppisite phase of U2, and noise gain is reduced on the numerical value to keep stable, need not to change signal gain.This one-level amplifier has characteristics such as slewing rate is fast, voltage gain height.
Principle of work of the present invention is: using atmospheric air pulse ionization chamber of the present invention is a seal chamber, tested radon and carrier gas thereof enter cavity by the valve that is communicated with, the cavity internal fixation has an excellence conductor passive electrode 3, its signal of collecting the alpha energy spectrum information output of tested radon and daughter thereof directly is coupling on the input end (SIN_IN) of charge amplifier, output after charge amplifier amplifies, the voltage pulse signal that the amplitude that output terminal (SIN_OUT) produces is directly proportional with the incident alpha-particle energy, be connected on the multichannel pulse size analyzer device, can record the α spectrum of radon.
Effect of the present invention and advantage are:
1, this device is mainly used in the measurement of radon and daughter alpha energy spectrum thereof, also can be used for the spectral measurement of the α particle of the radiation of other gases and solid, property sample, and the concrete size with detection sensitivity height, ionization chamber can be determined according to practical measurement requirement.
2, owing to adopted ionization chamber, have characteristics such as detection sensitivity height, volume is big, cost is low, learn an important breakthrough of nuclear technology field with can yet be regarded as alpha particle detector.Be technology for detection, the evaluation in this field, and further enlarge and break through range of application and established good basis.
3, charge sensitive amplifier circuit of the present invention, radon and daughter alpha energy spectrum measurement mechanism thereof have been constituted with using atmospheric air pulse ionization chamber, characteristics such as the detection sensitive volume of having inherited the ionization chamber detector is big, cost is low, have the function that alpha energy spectrum is measured again, having solved present using atmospheric air pulse ionization chamber can not be as the problem of radon and daughter alpha energy spectrum measurement thereof.
4, because the breakthrough of measuring technology of the present invention enlarges range of application, be not only teaching, can also be applied to each technical field of measurement and test of industry, as technical fields such as mine locating, scientific research, space explorations, for actual contribution has been made in the national science and technology development.
Description of drawings
Fig. 1 the present invention tests the connection block diagram.
Fig. 2 is the using atmospheric air pulse ionization chamber organigram.
Fig. 3 is Fig. 1 schematic side view.
Fig. 4 is the charge sensitive amplifier circuit schematic diagram.
Among the figure: 1, metal shell; 2, insulation valve; 3, good conductor passive electrode; 4, insulation course; 5, insulator; 6, metal nut; 7, cover 8, insulator overcoat in the insulator; 9, metal coating ring; 10, metal end; 11, insulcrete; 12, insulation handle.
Embodiment
As shown in Figure 1.Using atmospheric air pulse ionization chamber of the present invention be an airtight cavity, with the sealing ionization chamber is core, the radgas sample enters high-field electrode 1 cavity of ionization chamber by exsiccator, the gaseous sample outlet is communicated with the radgas sample by the sealing air pump more again, forms the circulation of sealing gas circuit; The cavity internal fixation has an excellence conductor passive electrode 3, the input end (SIN_IN) that the signal output of passive electrode 3 directly is coupling in charge-sensitive preamplifier connects, linear amplification and pulse modulate circuit produce the voltage pulse signal that amplitude is directly proportional with the incident alpha-particle energy, after being connected with multichannel pulse size analyzer is single-phase behind the output terminal (SIN_OUT), can record the α spectrum of radon.Single-chip microcomputer with responsible data acquisition, control, storage, demonstration, telecommunications and data processing is connected again, at last by connector and two-way connection of computing machine (PC).
As shown in Figure 2.The present invention is mainly by using atmospheric air pulse ionization chamber, composition combines with charge amplifier two parts, it is characterized in that: ionization chamber adopts cylindric pulse ionization chamber, be fixed on the central authorities that the end one end is arranged on the high-field electrode 1 by good conductor passive electrode 3, between high-field electrode 1 and good conductor passive electrode 3, insulation course arranged; There are two insulation valves 2 to be communicated with formation with the inner chamber of high-field electrode 1, two valves, one-in-and-one-out is used to be communicated with tested gas.
Shown in Fig. 2,3.Described have insulation course and metal coating ring to be meant between high-field electrode 1 and good conductor passive electrode 3: metal coating ring 9 passes high-field electrode 1, and cover 7 hard-pressed bales wrap good conductor passive electrode 3 in insulator overcoat 8 and the insulation protection, pass metal coating ring 9 again; Metal nuts 6 is spun on the metal coating ring 9, near end cap 10.
As shown in Figure 1.Between the bottom of high-field electrode 1 and end cap 10, insulation course 4 is arranged; The opening end of high-field electrode 1 has door 12, on the door insulcrete 11 and handle 13 is arranged.Here the metal coating ring should with electrically reliably be connected.
As shown in Figure 5.Described charge sensitive amplifier circuit, it is constituted by charge-sensitive level and amplification output stage two two-stages: the firstth, charge-sensitive level, function are that charge signal is converted to voltage amplitude output, and realize the function that charge-sensitive amplifies.This one-level is made of mode and low noise, the wide band amplifier AD8066 of low noise high frequency technotron with common-source amplifier, has characteristics such as input impedance height, noise is low, response is good.In the charge-sensitive level, field effect transistor Q1 and resistance R 5 have constituted the load of constant current source as field effect transistor Q2, because the internal resistance of constant current source is very big, have so just improved the gain of the common-source amplifier of Q1, Q2 formation greatly.The in-phase input end of an operational amplifier U1 among the drain electrode of Q2 and the AD8066 is connected pulse signal is amplified.
The secondth, amplify output stage, in order to potential pulse is further amplified, constitute by another operational amplifier U2 among the AD8066.R11 is that the resistance that manys littler than R12 links to each other it with homophase, the end of oppisite phase of U2, and noise gain is reduced on the numerical value to keep stable, need not to change signal gain.This one-level amplifier has characteristics such as slewing rate is fast, voltage gain height.
Claims (5)
1. the method with using atmospheric air pulse ionization chamber survey radon and daughter alpha energy spectrum thereof is made up of using atmospheric air pulse ionization chamber, charge amplifier and signal Processing three parts, it is characterized in that:
A. described using atmospheric air pulse ionization chamber, with the sealing ionization chamber is core, the radgas sample enters high-field electrode (1) cavity of ionization chamber by exsiccator, and the gaseous sample outlet is communicated with the radgas sample by the sealing air pump more again, forms the sealing gas circuit and circulates;
B. described charge amplifier, it is signal with passive electrode in the cavity (3), output is coupling in the input end of charge-sensitive preamplifier, linear amplification and pulse modulate circuit produce the voltage pulse signal that amplitude is directly proportional with the incident alpha-particle energy, are connected with multichannel pulse size analyzer behind output terminal (SIN_OUT); The circuit of this charge amplifier is made of charge-sensitive level and amplification output stage two parts;
C. described signal Processing, the α spectrum signal with the radon that records is connected with the single-chip microcomputer of responsible data acquisition, control, storage, demonstration, telecommunications and data processing, at last by connector and two-way connection of computing machine (PC).
2. the method for surveying radon and daughter alpha energy spectrum thereof with using atmospheric air pulse ionization chamber according to claim 1; it is characterized in that: described using atmospheric air pulse ionization chamber adopts cylindric pulse ionization chamber; its housing also is high-field electrode (1); passive electrode (3) is arranged in the housing; being insulated interior cover of protection (7) and insulation protection overcoat (8) double hyer insulation cover wraps tightly; wrap by metal coating ring (9) again and pass high-field electrode (1); cover upper insulator (5) and metal nut (6), the passive electrode (3) that the double hyer insulation cover is wrapped is fixed on the high-field electrode (1).
3. the method for surveying radon and daughter alpha energy spectrum thereof with using atmospheric air pulse ionization chamber according to claim 2, it is characterized in that: on high-field electrode (1), be fixed with two valves (2), be communicated with high-field electrode (1) inner chamber, two valve one-in-and-one-outs are used to be communicated with tested gas; High-field electrode (1) has end door (12), insulcrete (11) is arranged and be fixed with handle (13) on the door.
4. the method for surveying radon and daughter alpha energy spectrum thereof with using atmospheric air pulse ionization chamber according to claim 1, it is characterized in that: the charge-sensitive level of described charge sensitive amplifier circuit, be that charge signal is converted to voltage amplitude output, and the function of realization charge-sensitive amplification, mode and low noise, wide band amplifier AD8066 with common-source amplifier constitutes by low noise high frequency technotron, and field effect transistor Q1 and resistance R 5 have constituted the load of constant current source as field effect transistor Q2; The in-phase input end of an operational amplifier U1 among the drain electrode of Q2 and the AD8066 is connected pulse signal is amplified.
5. the method for surveying radon and daughter alpha energy spectrum thereof with using atmospheric air pulse ionization chamber according to claim 1, it is characterized in that: charge amplifier second amplifies output stage, finish in order to another operational amplifier U2 that voltage pulse signal is further amplified by among the AD8066, R11 is the resistance that manys littler than R12, be connected with homophase, the end of oppisite phase of U2, it is interior to keep stable to make noise gain reduce a numerical range, need not to change signal gain.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB200510022380XA CN100371737C (en) | 2005-12-23 | 2005-12-23 | Method of detecting radon and its daughter alpha energy spectrum using atmospheric air pulse ionization chamber |
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| CNB200510022380XA CN100371737C (en) | 2005-12-23 | 2005-12-23 | Method of detecting radon and its daughter alpha energy spectrum using atmospheric air pulse ionization chamber |
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| CN1794011A CN1794011A (en) | 2006-06-28 |
| CN100371737C true CN100371737C (en) | 2008-02-27 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101377548B (en) * | 2008-09-29 | 2012-05-23 | 南华大学 | Method and apparatus for rebuilding and measuring 222Rn and 220Rn horizontal alpha energy spectrum in air |
| CN103336016B (en) * | 2013-06-06 | 2015-07-15 | 四川材料与工艺研究所 | Totally closed alpha-energy spectrum measurement system |
| CN105738937A (en) * | 2016-04-29 | 2016-07-06 | 成都理工大学 | Static alpha-cup multifunctional emanometer |
| WO2018231486A1 (en) * | 2017-06-16 | 2018-12-20 | Thermo Fisher Scientific Inc. | System and method for an interrupt mode ion chamber |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1023362A2 (en) * | 1982-01-08 | 1983-06-15 | Казанский Ордена Трудового Красного Знамени Авиационный Институт Им.А.Н.Туполева | Device for counting ions |
| CN85107800A (en) * | 1985-10-23 | 1986-07-23 | 成都地质学院 | Radon and daughter detection device thereof and method of work in the earth |
| RU2025820C1 (en) * | 1990-06-19 | 1994-12-30 | Высокогорный геофизический институт | Meter of intensity of ion formation |
| CN2736766Y (en) * | 2004-09-14 | 2005-10-26 | 清华同方威视技术股份有限公司 | Circuit for monitoring accelerator single pulse dosage changes |
-
2005
- 2005-12-23 CN CNB200510022380XA patent/CN100371737C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1023362A2 (en) * | 1982-01-08 | 1983-06-15 | Казанский Ордена Трудового Красного Знамени Авиационный Институт Им.А.Н.Туполева | Device for counting ions |
| CN85107800A (en) * | 1985-10-23 | 1986-07-23 | 成都地质学院 | Radon and daughter detection device thereof and method of work in the earth |
| RU2025820C1 (en) * | 1990-06-19 | 1994-12-30 | Высокогорный геофизический институт | Meter of intensity of ion formation |
| CN2736766Y (en) * | 2004-09-14 | 2005-10-26 | 清华同方威视技术股份有限公司 | Circuit for monitoring accelerator single pulse dosage changes |
Non-Patent Citations (1)
| Title |
|---|
| 两种用于氡气测量装置的电荷灵敏前置放大器的研制. 耿波，方方，张国华，郑奕挺.核电子学与探测技术，第25卷第6期. 2005 * |
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