CN101620274A - Alpha energy spectrum measuring method of radon in soil based on static diffusion and electrostatic adsorption principle of radon in soil - Google Patents
Alpha energy spectrum measuring method of radon in soil based on static diffusion and electrostatic adsorption principle of radon in soil Download PDFInfo
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Abstract
The invention discloses an alpha energy spectrum measuring method of radon in soil based on a static diffusion and electrostatic adsorption principle of the radon in soil, which comprises the following steps: (A) during measuring, burying a radon daughter electrostatic adsorption device in soil for a period of time, and then taking the radon daughter electrostatic adsorption device out and using an alpha energy spectrum measuring device to measure adsorbed radon daughters; (B) using a high-voltage electrostatic charging device to charge the radon daughter electrostatic adsorption device so as to enable the radon daughter electrostatic adsorption device to have high-voltage static electricity; (C) using an alpha energy spectrum measuring and data managing device to measure the alpha energy spectrum information of the adsorbed radon daughters of the radon daughter electrostatic adsorption device and concentratively managing the data; and (D) using a computer software analysis system to detailedly analyze the measuring data. The method can overcome the defects of the prior measuring method of the radon in soil, solve the problems of low soil radon measurement efficiency, precision, accuracy and reliability, and the like, indirectly measure the radon in soil by measuring nuclides of the radon daughters in soil, overcome the influences of thoron and meet the urgent requirement on the measurement of the radon the soil of the geological survey field and the environmental evaluation field at present.
Description
Technical field
The present invention relates to the detection technique field, specifically, survey the application requirements of radon, propose a kind of based on radon alpha energy spectrum measuring method in the radon static diffusion and electrostatic adsorption principle earth in the earth at the soil in present geologic prospect field and environmental evaluation field.
Background technology
Soil is surveyed radon and is widely used in geologic prospect field and radioactive environmental evaluation field.In the geologic prospect field, radon exception monitoring, landslide slide structure band are reconnoitred before exploration that uranium exploration, bedrock underground water are reconnoitred, subterranean coal dieseling fire distributes, the earthquake shake, reconnoitring etc. of the reconnoitring of surface collapse and goaf, building lot potential fault and ground fissure can adopt soil survey radon method to realize.Penetrate the evaluation field in putting property of environment,, also all need to carry out Soil Radon and measure such as the detection of market place builet below the ground ground radon concentration index, the detection of structure foundation Soil Radon concentration index etc.
The method that has soil survey radon now mainly comprises: pump suction type instantaneous detecting radon method, static α card always measure radon, alpha track is surveyed radon, Po-210 method survey radon, α cup absorption method survey radon, natural thermoluminescent method survey radon.These Soil Radon measuring methods are in the reliability of surveying work efficient, working automation degree, measurement data and measure sensitivity etc. and all have some defectives, seldom make simultaneously alpha energy spectrum and measure, radon measurement is a very important gordian technique in using in earth and alpha energy spectrum is measured.Because technical reason, present main radon measurement method α cup, α card absorption method are difficult to accomplish alpha energy spectrum and measure.Static α card measuring method does not provide more stable, unified, a cheap high-pressure electrostatic holding device as yet at present, does not adopt the alpha energy spectrum metering system as yet yet.Though pump suction type transient measurement method solves the alpha energy spectrum problems of measurement, but because factor affecting such as measurement environment, soil compactness, Soil Radon source of the gas enrichment condition alter a great deal the measurement data that obtains in the total minute, be difficult to analysis and utilization, simultaneously because the detector pollution problem makes real work efficient very low.Low and the radon daughter electrostatic adsorption device is not fragile based on radon alpha energy spectrum measuring method hardware system cost in the radon static diffusion and electrostatic adsorption principle earth in the earth, be convenient to layout in a large number, being suitable for extensive geology reconnoitres, when increasing work efficiency, also can obtain the radon daughter information that Instantaneous Method and continuous mode method can't be surveyed, have simultaneously and distinguish the radon thorium, make detector avoid that radon daughter pollutes, characteristics such as easy to use.
Summary of the invention
Technical matters to be solved by this invention is, how to provide based on radon alpha energy spectrum measuring method in the radon static diffusion and electrostatic adsorption principle earth in the earth, this method can overcome the defective that existing soil is surveyed the radon method, soil be can solve and the efficiency of measurement of radon, measuring accuracy, measurement accuracy, problem that the measurement reliability is low surveyed, can realize observational measurement to radon daughter nucleic in the earth, thereby realize measurement indirectly to radon in the earth, the influence of thoron can be eliminated, thereby the active demand that present geologic prospect field and environmental evaluation field are measured Soil Radon can be satisfied.
To achieve the above object of the invention, the technical solution adopted in the present invention: provide a kind of based on radon alpha energy spectrum measuring method in the radon static diffusion and electrostatic adsorption principle earth in the earth, it is characterized in that total system is made of negative high voltage electrostatic charging device, radon daughter electrostatic adsorption device, alpha energy spectrum measurement and data administrator and computer software analysis system 4 parts.
Based on radon alpha energy spectrum measuring method in the radon static diffusion and electrostatic adsorption principle earth in the earth, it is characterized in that described method comprises the steps: according to provided by the present invention
A, by the negative high voltage electrostatic charging device, with the charging of radon daughter electrostatic adsorption device, make its band negative high voltage static.
B, select measurement point according to measuring needs, the radon daughter electrostatic adsorption device is embedded in the soil of each measurement point, the embedding time is the time that radon and daughter thereof can reach radioactivity mobile equilibrium again in the earth;
C, radon daughter electrostatic adsorption device are collected radon daughter in sheet (Fig. 3-(2)) the absorption earth by the radon daughter of the band negative high voltage static of its inside;
D, etc. after radon daughter reaches radioactivity mobile equilibrium again in the earth, take out the radon daughter of radon daughter electrostatic adsorption device inside and collect sheet, exist side by side and pack promptly that alpha energy spectrum is measured into and data administrator carries out alpha energy spectrum and measures;
E, alpha energy spectrum measure and data administrator can be connected with computer software by interface, by computer software measurement data is carried out unified Analysis and handle, and the generation image are exported.
According to provided by the present invention based on radon alpha energy spectrum measuring method in the radon static diffusion and electrostatic adsorption principle earth in the earth, it is characterized in that, described negative high voltage charging device obtains the input power supply by reference power supply interface (Fig. 2-(4)) from alpha energy spectrum measurement and data administrator, by the high voltage conversion circuit of DC/DC (Fig. 2-(2)), convert input voltage to negative high voltage output (Fig. 2-(1)).
According to provided by the present invention based on radon alpha energy spectrum measuring method in the radon static diffusion and electrostatic adsorption principle earth in the earth, it is characterized in that described radon daughter electrostatic adsorption device is made up of radon diffusion cavity (Fig. 3-(3)), radon daughter collection sheet (Fig. 3-(2)) and negative high voltage static retainer (Fig. 3-(1)) three parts in the earth respectively.Leave radon diffusion hole in the earth (Fig. 4-(8)) on the radon diffusion cavity in the earth, the mesh size can diffuse into and is advisable for soil particle should not enter in the earth radon and daughter thereof.Radon daughter collect sheet for conduction be difficult for corrosion and radon daughter had the material of better adsorbability, place the radon daughter absorption sheet of radon diffusion cavity top to place in the groove (Fig. 4-(7)).The high-pressure electrostatic of negative high voltage static retainer is kept by CBB high-voltage capacitance (Fig. 4-(2)), CBB high-voltage capacitance negative high voltage static output terminal connection circuit plate (Fig. 4-(3)), on circuit board, weld spring (Fig. 4-(4)) and be connected with negative high voltage static output terminal, internal circuit passes through ground connection copper post (Fig. 4-(1)) and is connected with the earth with epoxy resin perfusion sealing, electrostatic high-pressure ground end.Radon diffusion cavity and negative high voltage static retainer shell are the insulating material with better hardness and strong ageing resistance in the earth.Negative high voltage static retainer is connected with radon diffusion cavity in the earth by connecting turnbuckle (Fig. 4-(5)), when the high-pressure electrostatic body is connected with radon diffusion cavity in the earth, its high-voltage output end can be collected sheet (Fig. 4-(6)) by spring and radon daughter and be connected, and makes its band negative high voltage static.
According to radon daughter electrostatic adsorption device provided by the invention, it is characterized in that, during the radon daughter electrostatic adsorption device is placed into the soil when work, and make radon daughter collection sheet place radon diffusion inside cavity and soil to isolate.
According to provided by the present invention based on radon alpha energy spectrum measuring method in the radon static diffusion and electrostatic adsorption principle earth in the earth, it is characterized in that, increase adsorptive power by negative high voltage static to radon daughter in the earth, measure the characteristic information that obtains radon daughter in the earth by alpha energy spectrum, thereby obtain radon concentration information in the earth indirectly.
According to provided by the present invention based on radon alpha energy spectrum measuring method in the radon static diffusion and electrostatic adsorption principle earth in the earth, it is characterized in that described alpha energy spectrum is measured and data administrator is made up of radon daughter readout device (Fig. 5) and alpha energy spectrum metering circuit system (Fig. 6).Semiconductor detector (Fig. 5-(2)) and charge-sensitive pre-amplification circuit (Fig. 5-(1)) are equipped with in radon daughter readout device inside, and the alpha energy spectrum metering circuit is connected by the charge-sensitive pre-amplification circuit of interface line with radon daughter readout device inside.Radon daughter being collected movable tray (Fig. 5-(the 5)) radon daughter of sheet (Fig. 5-(4)) the radon daughter readout device of packing into collects in the sheet placement groove (Fig. 5-(3)), make its radon daughter absorption surface near semiconductor detector, the radon daughter generation alpha-decay that is adsorbed on the radon daughter collection sheet produces the α particle, these α particle signals that detect by semiconductor detector, after amplifying circuit nurses one's health amplification by conditioning, convert the alpha energy spectrum signal to through multichannel pulse scope-analyzer again and enter microprocessor and carry out the alpha energy spectrum analysis.Whole alpha energy spectrum is measured and data administrator is provided with the low-power dissipation power supply administration module.
In sum, provided by the present invention have following advantage based on radon alpha energy spectrum measuring method in the radon static diffusion and electrostatic adsorption principle earth in the earth:
1, in system design, radon daughter is collected and separately design of measurement of radon daughters, help eliminating the pollution of radon daughter to detector.
2, on measuring principle, based on radon static diffusion and electrostatic adsorption principle in the earth, adopted high voltage electrostatic device to increase the quantity of information of absorption radon daughter, and adopted alpha energy spectrum to survey the radon mode, the qualitative analysis of radon daughter nucleic in the earth can be provided, thereby realize the measurement of radon in the earth indirectly, can distinguish uranium series and the daughter of thorium family alpha-decay.
3, on the surveying work mode, can carry out the multi-measuring point synchronous working mode that large tracts of land is layouted, but make measurement data have more comparative.Can be according to actual measurement requirements of one's work configuration radon daughter electrostatic adsorption device quantity, this realistic application demand, surveying work efficient height.
4, on cost performance, radon daughter electrostatic adsorption device low production cost, not fragile during use, alpha energy spectrum is measured and the data administrator structure is small and exquisite, low in energy consumption, low price, easy to use etc., so is convenient to promote the use of.
5, on using, can be applicable to that uranium exploration, bedrock underground water are reconnoitred, subterranean coal dieseling fire distributes exploration, landslide slide structure band is reconnoitred, the field such as reconnoitre of the reconnoitring of surface collapse and goaf, building lot potential fault and ground fissure.
Description of drawings
Fig. 1 is the structure diagram based on radon alpha energy spectrum measuring method in the radon static diffusion and electrostatic adsorption principle earth in the earth;
Fig. 2 is a negative high voltage electrostatic charging device structure partial cut-open view;
Wherein, (1) negative high-voltage electrode; (2) the high voltage conversion circuit of DC/DC; (3) high pressure ground; (4) power supply input standard interface; (5) connect turnbuckle.
Fig. 3 radon daughter electrostatic adsorption device is formed partial sectional view;
Wherein, (1) negative high voltage static retainer; (2) radon daughter is collected sheet; (3) radon diffusion cavity in the earth.
Fig. 4 radon daughter electrostatic adsorption device structure partial cut-open view;
Wherein, (1) ground connection copper post; (2) CBB high-voltage capacitance; (3) circuit board; (4) spring; (5) connect turnbuckle; (6) radon daughter is collected sheet; (7) radon daughter is collected sheet and is placed groove; (8) radon and daughter diffusion hole thereof in the earth.
Fig. 5 radon daughter readout device structure partial cut-open view
Wherein, (1) charge-sensitive preamplifier circuit board; (2) semiconductor detector; (3) radon daughter is collected sheet and is placed groove; (4) radon daughter is collected sheet; (5) movable tray;
Fig. 6 alpha energy spectrum is measured and data administrator metering circuit functional diagram.
Embodiment
Below in conjunction with accompanying drawing embodiments of the present invention are described in detail.
Provided by the present invention based on radon alpha energy spectrum measuring method in the radon static diffusion and electrostatic adsorption principle earth in the earth, it is characterized in that, described method comprises the steps: A, passes through the negative high voltage electrostatic charging device, with the charging of radon daughter electrostatic adsorption device, makes its band negative high voltage static; B, select measurement point according to measuring needs, the radon daughter electrostatic adsorption device is embedded in the soil of each measurement point, the embedding time is the time that radon and daughter thereof can reach radioactivity mobile equilibrium again in the earth; C, radon daughter electrostatic adsorption device are collected radon daughter in sheet (Fig. 3-(2)) the absorption earth by the radon daughter of its inner band negative high voltage static; D, etc. after radon and daughter thereof reach radioactivity mobile equilibrium again in the earth, take out the radon daughter of radon daughter electrostatic adsorption device inside and collect sheet, exist side by side and pack promptly that alpha energy spectrum is measured into and data administrator carries out alpha energy spectrum and measures; E, alpha energy spectrum measure and data administrator can be connected with computer software by interface, and by computer software measurement data analyzing and processing, and the generation image is exported.
Figure 1 shows that structure diagram based on radon alpha energy spectrum measuring method in the radon static diffusion and electrostatic adsorption principle earth in the earth, as shown in the figure, whole measuring system comprises that several radon daughter electrostatic adsorption devices, negative high voltage electrostatic charging device, alpha energy spectrum measurement and data administrator and computer software analysis system 4 parts constitute.Can be connected with alpha energy spectrum measurement and data administrator by the reference power supply interface line when described negative high voltage electrostatic charging device charges to the radon daughter electrostatic adsorption device obtains the power supply input, is connected with the negative high voltage electrostatic charging device by turnbuckle when described radon daughter electrostatic adsorption device charges.Imbed in the earth when described radon daughter electrostatic adsorption device is worked, after radon daughter all reaches radioactivity mobile equilibrium in the wait earth, take out radon daughter collection sheet and carry out the alpha energy spectrum measurement by alpha energy spectrum measurement and data administrator.Adopt the USB mouth to be connected between described alpha energy spectrum measurement and data administrator and the Computer Analysis software;
Figure 2 shows that negative high voltage electrostatic charging device structure partial cut-open view.As shown in the figure, its inside has the high voltage conversion circuit of DC/DC (Fig. 2-(2)), when the radon daughter electrostatic adsorption device is charged, its power input measures with alpha energy spectrum by reference power supply interface line (Fig. 2-(4)) and the data administrator output port of power source is connected, and negative high voltage static output terminal links to each other with the radon daughter electrostatic adsorption device by turnbuckle (Fig. 2-(5)).When linking to each other, radon daughter electrostatic adsorption device negative high-voltage electrode links to each other with negative high voltage electrostatic charging device negative high-voltage electrode by spring, and high pressure ground (Fig. 2-(3)) link to each other with the high pressure ground (Fig. 4-(1)) of radon daughter electrostatic adsorption device by clip.
Figure 3 shows that radon daughter electrostatic adsorption device composition partial sectional view, as shown in the figure, form by radon diffusion cavity (Fig. 3-(3)), radon daughter collection sheet (Fig. 3-(2)) and negative high voltage static retainer (Fig. 3-(1)) three parts in the earth.
Figure 4 shows that radon daughter electrostatic adsorption device structure partial cut-open view, as shown in the figure, leave radon diffusion hole in the earth (Fig. 4-(8)) on the radon diffusion cavity in the earth, the mesh size can diffuse into and is advisable for soil particle should not enter in the earth radon and daughter thereof.Radon daughter collect sheet for conduction be difficult for corrosion and radon daughter had the material of better adsorbability, place the radon daughter absorption sheet of radon diffusion cavity top to place in the groove (Fig. 4-(7)).The high-pressure electrostatic of negative high voltage static retainer is kept by CBB high-voltage capacitance (Fig. 4-(2)), CBB high-voltage capacitance negative high voltage static output terminal connection circuit plate (Fig. 4-(3)), on circuit board, weld spring (Fig. 4-(4)) and be connected with negative high voltage static output terminal, internal circuit passes through ground connection copper post (Fig. 4-(1)) and is connected with the earth with epoxy resin perfusion sealing, electrostatic high-pressure ground end.Radon diffusion cavity and negative high voltage static retainer shell are the insulating material with better hardness and strong ageing resistance in the earth.Negative high voltage static retainer is connected with radon diffusion cavity in the earth by connecting turnbuckle (Fig. 4-(5)), when the high-pressure electrostatic body is connected with radon diffusion cavity in the earth, its high-voltage output end can be collected sheet (Fig. 4-(6)) by spring and radon daughter and be connected, and makes its band negative high voltage static.
Figure 5 shows that radon daughter readout device structure partial cut-open view.As shown in the figure, charge-sensitive preamplifier circuit board (Fig. 5-(1)) and semiconductor detector (Fig. 5-(2)) are equipped with in radon daughter readout device inside, and the alpha energy spectrum metering circuit is connected by the charge-sensitive pre-amplification circuit of interface line with radon daughter readout device inside.Radon daughter being collected radon daughter on the movable tray (Fig. 5-(5)) of sheet (Fig. 5-(4)) the radon daughter readout device of packing into collects sheet and places in the groove (Fig. 5-(3)), make radon daughter collect the radon daughter absorption surface of sheet near semiconductor detector, the radon daughter generation alpha-decay that is adsorbed on the radon daughter collection sheet produces the α particle, these α particle signals that detect by semiconductor detector, after amplifying circuit nurses one's health amplification by conditioning, convert the alpha energy spectrum signal to through multichannel pulse scope-analyzer again and enter microprocessor and carry out the alpha energy spectrum analysis.
Figure 6 shows that alpha energy spectrum measurement and data administrator metering circuit functional diagram.As shown in the figure, put, nurse one's health amplifying circuit, multichannel pulse scope-analyzer, SOC (system on a chip) microprocessor, man-machine interface, data memory module, GPS module, USB interface before comprising the semiconductor detector that is used to survey radon daughter, low noise.Detector detects the radon daughter signal, is amplified to the pulse signal of required size by preposition amplification and conditioning amplifying circuit, by multichannel pulse scope-analyzer this conversion of signals is become the alpha energy spectrum signal again, enters the SOC (system on a chip) microprocessor again and analyzes.By man-machine interface alpha energy spectrum measurement and data administrator are operated.The GPS module is mainly obtained the geographical position coordinates information of measuring point.The data of measuring can be stored by memory module, and can carry out exchanges data by USB interface and computer software.In order to save power supply, whole detector has adopted low-power dissipation power supply administration module design proposal.
Though described embodiments of the present invention in conjunction with the accompanying drawings, the protection domain that those of ordinary skills do not need various distortion that creativity work just can make or modification still to belong to this patent within the scope of the appended claims.
The present invention proposes based on radon alpha energy spectrum measuring method in the radon static diffusion and electrostatic adsorption principle earth in the earth, introduce its principle of work below.The main dependence of the diffusion of radon and absorption radon daughter electrostatic adsorption device provided by the present invention in the earth, its principle of work is: during whole radon daughter electrostatic adsorption device is directly placed into the soil, at radon daughter electrostatic adsorption device front end a radon and daughter diffusion chamber thereof are arranged, leave the diffusion mesh around the diffusion chamber, be convenient to radon and daughter diffuses through.Because radon has the long half life period (3.82 days), is again the uncharged gas of a kind of inertia, it has stronger diffusivity.So the radon in the soil mainly under the effect of radon concentration difference gradient difference, can overflow from earth and be diffused in the diffusion cavity.And original radon daughter in the earth, its major part upward exists with aerosol form for being adsorbed onto particulate (dust, steam etc.), also can enter diffusion chamber by the diffusion mesh.Simultaneously thoron with and corresponding long-lived daughter also can enter diffusion chamber by diffusion hole.There is the radon daughter of a band negative high voltage static to collect sheet in the radon daughter electrostatic adsorption device, when it imbeds in the earth, on physical arrangement, isolates, under the maintenance of electrostatic holding apparatus, keeping more stable negative high voltage static in the long period relatively with peripheral soil.Be diffused into diffusion radon of inside cavity and thoron and carry out alpha-decay by intrinsic decay rule and produce corresponding daughter, after through the time more than 4 hours, the radon in the earth and its daughter will reach radioactivity mobile equilibrium again.Major part because being the aerosol form with positively charged, radon daughter and the thoron daughter overwhelming majority exists, so under the electric field force effect, can be adsorbed to radon daughter and collect on the sheet.According to the radioactivity decay rule, under the radioactivity dynamic balance state, the α population that radon daughter decay produces is the retention wire sexual intercourse with the α population that radon decay itself produces, and therefore can measure the decay α population of generation of radon daughter by the alpha energy spectrum mode and measure radon concentration in the earth indirectly.
The invention reside in radon daughter and collect sheet surface generation alpha-decay, the sensitive area of the α particle bombardment semiconductor detector of generation at radon daughter.The α particle has the ability of very strong ionization material, and the P-N interface of meeting ionization semiconductor detector can produce a large amount of electron-hole pairs.Therefore, can pass through subsequent conditioning circuit, obtain corresponding metrical information.
According to natural radioactivity α half life period and mobile equilibrium rule as can be known, the main short-lived alpha-decay daughter of radon is
218Po (3.05 minutes half life period),
214Bi (19.7 minutes half life period),
214Po (half life period 164 microsecond), the main short-lived daughter of thoron is
216Po (0.15 second half life period),
212Bi (60.6 minutes half life period),
212Po (half life period 0.1 is delicate).Because
216The Po half life period is very short, seldom has its parent nuclide to be adsorbed to radon daughter simultaneously and collects on the sheet, therefore collects on the sheet at radon daughter
216The Po amount seldom can not considered basically.And
214Po and
212Though the Po half life period is very short, radon daughter is collected the parent nuclide that has these two daughters on the sheet
214Bi and
212Therefore Bi also exists when measuring
214Po,
212The decay body of these two daughters of Po.Therefore, collecting the natural alpha emitter that mainly exists on the sheet at radon daughter has
218Po,
214Bi,
214Po,
212Bi,
212Po.And
214The probability that alpha-decay takes place Bi only has 0.33%, with and the half life period
218Po,
214Po,
212Po is long,
212The probability that alpha-decay takes place Bi is 33.7%, and its half life period is than length and owing to it is
212Pb (10.64 hours half life period) gamma decay daughter, it reaches equilibration time needs more than 5 days.Therefore collect alpha emitters all on the sheet at the radon daughter of embedding several hrs and produce in the α population,
214Bi and
212Alpha-decay takes place Bi, and to produce the contribution of α particle less, the contribution of the α particle of generation mainly from
218Po,
214Po,
212Po.According to the natural radionuclide alpha ray spectrum as can be known,
218Po,
214Po and
212The Alpha-ray energy of Po all has the energy uniqueness, and its energy differs bigger, and characteristic is obvious.
218Po,
214Bi and
214Po is the daughter of radon, can reach balance again after filling out more than 4 hour digging pit to bury, in the α particle that radon and thoron and their daughter generation alpha-decay produce,
212The alpha-particle energy the highest (8.785MeV) that the Po decay produces is only second to it with energy
214Po (7.687MeV) differs bigger, also can tell even therefore measure under the relatively poor situation of energy resolution at alpha energy spectrum
212The signal of the α particle that the Po decay produces.Need only when therefore measuring and get rid of
212The α particle that the Po daughter disintegration produces, and keep
218Po,
214Bi and
214The α particle total amount that Po daughter generation alpha-decay produces can reach the purpose of measuring radon in the earth as measured value.
The present invention has following features:
1. on system, radon daughter is collected and measurement of radon daughters separately designs, be conducive to eliminate radon daughter pair The pollution of detector.
2. on measuring principle, based on radon static diffusion and electrostatic adsorption principle in the earth, adopted high voltage electrostatic device to increase Add the information content of adsorbing radon daughter, and adopted alpha energy spectrum to survey the radon mode, alpha energy spectrum is surveyed radon can provide radon The qualitative analysis of body, thus indirectly realize the measurement of radon, can distinguish uranium series and the daughter of thorium family alpha-decay;
3. on the surveying work mode, can carry out the multi-measuring point synchronous working mode that large tracts of land is layouted, can be as required Configuration radon daughter electrostatic adsorption device quantity, the operating efficiency that realistic application demand and raising are measured;
4. on cost performance, radon daughter electrostatic adsorption device low production cost, not fragile during use, alpha energy spectrum Measure and the data administrator structure is small and exquisite, low in energy consumption, low price, easy to use etc., so be convenient to Promote the use of.
5. on using, can be applicable to that uranium exploration, bedrock underground water are reconnoitred, subterranean coal dieseling fire branch Cloth exploration, landslide sliding structure band are reconnoitred, the reconnoitring of surface collapse and goaf, building lot is latent breaks Layer and the field such as reconnoitring of ground fissure.
6. mainly finishing the radon in soil daughter alpha energy spectrum on circuit function measures. Aspect the alpha ray particle detection, Because alpha ray has very strong ionizing power with material as the time spent, according to this characteristic, nuclear radiation detection Device can convert the alpha ray particle of different-energy to the faint electric signal of corresponding size, then by follow-up Circuit carries out shaping to this faint electric signal and amplifies, and enters after making it to become an electric impulse signal Multichannel pulse scope-analyzer. Carry out work by control circuit control multichannel pulse scope, the different width of cloth The analog signal conversion of degree becomes corresponding data signal, and track address of this digitized representation is with track address As the address code recording impulse number of memory, the numeration of each track address just can be the distribution of impulse amplitude Situation shows. And the range signal size is the different performance of each element emittance, location, corresponding road The radiation intensity of the corresponding energy of counting representative. The Alpha-ray energy of radon daughter is fixed, and passes through multiple tracks The mode of power spectrum can be measured the radon daughter relevant information data.
Claims (7)
1, based on radon alpha energy spectrum measuring method in the radon static diffusion and electrostatic adsorption principle earth in the earth, it is characterized in that total system is made of negative high voltage electrostatic charging device, radon daughter electrostatic adsorption device, alpha energy spectrum measurement and data administrator and computer software analysis system 4 parts.
2, according to claim 1 based on radon alpha energy spectrum measuring method in the radon static diffusion and electrostatic adsorption principle earth in the earth, it is characterized in that described method comprises the steps:
A, by negative high voltage electrostatic charging device (Fig. 2), with radon daughter electrostatic adsorption device charging (Fig. 3), make its band negative high voltage static.
B, select measurement point according to measuring needs, the radon daughter electrostatic adsorption device is embedded in the soil of each measurement point, the embedding time is the time that radon and daughter thereof can reach radioactivity mobile equilibrium again in the earth;
C, radon daughter electrostatic adsorption device are collected radon daughter in sheet (Fig. 3-(2)) the absorption earth by the radon daughter of the band negative high voltage static of its inside;
D, etc. after radon daughter reaches radioactivity mobile equilibrium again in the earth, take out the radon daughter of radon daughter electrostatic adsorption device inside and collect sheet, exist side by side and pack promptly that alpha energy spectrum is measured into and data administrator carries out alpha energy spectrum and measures;
E, alpha energy spectrum measure and data administrator can be connected with computer software by interface, by computer software measurement data is carried out unified Analysis and handle, and the generation image are exported.
3, according to claim 1 based on radon alpha energy spectrum measuring method in the radon static diffusion and electrostatic adsorption principle earth in the earth, it is characterized in that, described negative high voltage charging device obtains the power supply input by reference power supply interface (Fig. 2-(4)) from alpha energy spectrum measurement and data administrator, by the high voltage conversion circuit of DC/DC (Fig. 2-(2)), convert input voltage to negative high voltage output (Fig. 2-(1)).
4, according to claim 1 based on radon alpha energy spectrum measuring method in the radon static diffusion and electrostatic adsorption principle earth in the earth, it is characterized in that described radon daughter electrostatic adsorption device is made up of radon diffusion cavity (Fig. 3-(3)), radon daughter collection sheet (Fig. 3-(2)) and negative high voltage static retainer (Fig. 3-(1)) three parts in the earth respectively.Leave radon diffusion hole in the earth (Fig. 4-(8)) on the radon diffusion cavity in the earth, the mesh size can diffuse into and is advisable for soil particle should not enter in the earth radon and daughter thereof.Radon daughter collect sheet for conduction be difficult for corrosion and radon daughter had the material of better adsorbability, place the radon daughter absorption sheet of radon diffusion cavity top to place in the groove (Fig. 4-(7)).The high-pressure electrostatic of negative high voltage static retainer is kept by CBB (polypropylene) high-voltage capacitance (Fig. 4-(2)), CBB high-voltage capacitance negative high voltage static output terminal connection circuit plate (Fig. 4-(3)), on circuit board, weld spring (Fig. 4-(4)) and be connected with negative high voltage static output terminal, internal circuit passes through ground connection copper post (Fig. 4-(1)) and is connected with the earth with epoxy resin perfusion sealing, electrostatic high-pressure ground end.Radon diffusion cavity and negative high voltage static retainer shell are the insulating material with better hardness and strong ageing resistance in the earth.Negative high voltage static retainer is connected with radon diffusion cavity in the earth by connecting turnbuckle (Fig. 4-(5)), when the high-pressure electrostatic body is connected with radon diffusion cavity in the earth, its high-voltage output end can be collected sheet (Fig. 4-(6)) by spring and radon daughter and be connected, and makes its band negative high voltage static.
5, according to claim 1 based on radon alpha energy spectrum measuring method in the radon static diffusion and electrostatic adsorption principle earth in the earth, it is characterized in that, in placing into the soil when described radon daughter electrostatic adsorption device is worked, and make radon daughter collection sheet place radon diffusion inside cavity and soil to isolate.
6, according to claim 1 based on radon alpha energy spectrum measuring method in the radon static diffusion and electrostatic adsorption principle earth in the earth, it is characterized in that, increase adsorptive power by negative high voltage static to radon daughter in the earth, measure the characteristic information that obtains radon daughter in the earth by alpha energy spectrum, thereby obtain radon concentration information in the earth indirectly.
7, according to claim 1 based on radon alpha energy spectrum measuring method in the radon static diffusion and electrostatic adsorption principle earth in the earth, it is characterized in that described alpha energy spectrum is measured and data administrator is made up of radon daughter readout device (Fig. 5) and alpha energy spectrum metering circuit system (Fig. 6).Semiconductor detector (Fig. 5-(2)) and charge-sensitive pre-amplification circuit (Fig. 5-(1)) are equipped with in radon daughter readout device inside, and the alpha energy spectrum metering circuit is connected by the charge-sensitive pre-amplification circuit of interface line with radon daughter readout device inside.Radon daughter being collected radon daughter on the movable tray (Fig. 5-(5)) of sheet (Fig. 5-(4)) the radon daughter readout device of packing into collects sheet and places in the groove (Fig. 5-(3)), make radon daughter collect the radon daughter absorption surface of sheet near semiconductor detector, the radon daughter generation alpha-decay that is adsorbed on the radon daughter collection sheet produces the α particle, these α particle signals that detect by semiconductor detector, after amplifying circuit nurses one's health amplification by conditioning, convert the alpha energy spectrum signal to through multichannel pulse scope-analyzer again and enter microprocessor and carry out the alpha energy spectrum analysis.Whole alpha energy spectrum is measured and data administrator is provided with the low-power dissipation power supply administration module.
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| CN102313897A (en) * | 2010-06-29 | 2012-01-11 | 成都理工大学 | Radioactive spectrum identification method |
| CN103091472A (en) * | 2013-01-25 | 2013-05-08 | 南华大学 | Method for rapidly measuring soil potential radon consistence |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102313897A (en) * | 2010-06-29 | 2012-01-11 | 成都理工大学 | Radioactive spectrum identification method |
| CN103091472A (en) * | 2013-01-25 | 2013-05-08 | 南华大学 | Method for rapidly measuring soil potential radon consistence |
| CN103091472B (en) * | 2013-01-25 | 2015-04-29 | 南华大学 | Method for rapidly measuring soil potential radon consistence |
| CN105738937A (en) * | 2016-04-29 | 2016-07-06 | 成都理工大学 | Static alpha-cup multifunctional emanometer |
| CN106197544A (en) * | 2016-07-18 | 2016-12-07 | 南华大学 | Particle packing type is emanated the determination method of physical parameter and measurement apparatus thereof that medium radon migrates |
| CN106197544B (en) * | 2016-07-18 | 2018-05-18 | 南华大学 | Particle packing type emanate medium radon migration physical parameter definite method and its measuring device |
| CN107656318A (en) * | 2017-08-25 | 2018-02-02 | 中国石油天然气股份有限公司 | Geological time determination method and device |
| CN107664765A (en) * | 2017-11-03 | 2018-02-06 | 成都理工大学 | A kind of radon daughter board accumulates absorption type Soil Radon rapid measurement device |
| CN112230263A (en) * | 2020-09-04 | 2021-01-15 | 核工业二〇八大队 | Geological comprehensive investigation and evaluation method for radioactive environment of underground coal mining |
| CN112462406A (en) * | 2020-11-11 | 2021-03-09 | 核工业北京地质研究院 | Deep uranium mineralization radioactivity and deep penetration geochemical combination identification method |
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