CN1029532C - Method and instrument for measuring radon eduction rate on medium furface - Google Patents
Method and instrument for measuring radon eduction rate on medium furface Download PDFInfo
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- CN1029532C CN1029532C CN 91109913 CN91109913A CN1029532C CN 1029532 C CN1029532 C CN 1029532C CN 91109913 CN91109913 CN 91109913 CN 91109913 A CN91109913 A CN 91109913A CN 1029532 C CN1029532 C CN 1029532C
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Abstract
The present invention relates to a medium surface radon releasing ratio measuring instrument, which is divided into two parts of a probe head part and a measuring device part, wherein the probe head part comprises an accumulation box, a detector, a preamplifier and a discrimination forming circuit; the measuring device part is composed of an interface circuit, a computer, a printer and a high voltage power supply. The measuring instrument can be used for directly measuring released radon. The present invention is characterized in that the radon accumulation box in the probe head comprises double layers which are coaxially sheathed; the present invention overcomes the defect that because of the air exchange or the outside leakage of single layer accumulation boxes, measuring results are inaccurate.
Description
The invention belongs to the nuclear radiation detection field, be specifically related to a kind of radon eduction rate on medium furface measuring instrument.
Radon eduction rate on medium furface is measured, understood fully the source and the Changing Pattern thereof of radon,, correct selection building materials is had significance for selecting effective safeguard procedures.Meanwhile, carry out above-mentioned work, prior art all is that the radon gas accumulation box with an individual layer is buckled in and accumulates radon on the measured surface usually, leave from above with scintillation chamber or ionization chamber in the accumulation box of air hatch and take out radon gas, measure with the survey radon device of scaler or this routine of electrometer then.Radon gas takes out and to carry out at interval with certain hour, and this metering system belongs to indirectly to be measured, and the time that provides as a result is long.Existing method can be destroyed the interior balance of accumulation box owing to get gas, can bring serious error to surveying work.Said method, it is many more to get the gas number of times, and error is also just big more.In addition,, leakage and exchange are arranged, the problem of seal aspect is arranged in addition, also can bring influence to measurement result with the external world also because the radon gas accumulation box is an individual layer.Based on above-mentioned all multifactor, not only make troubles to work, especially can not guarantee radon release rate result's accuracy.
The objective of the invention is to, overcome in the prior art and leak and exchange with extraneous because of the individual layer accumulation box, make the inaccurate defective of measurement result and owing to repeatedly get the destruction that gas causes radon gas balance in the accumulation box, to the error that measurement result is brought, designed the directly quick radon release rate instrument of this dielectric surface.
Thinking of the present invention is: utilize radon when emitting a α particle, its residual nucleus are recoiled and ionization, the new particle moment that generates is positively charged, it is being placed under the electric field situation, can be collected in this characteristic on the electrode, design the present invention, its concrete technical scheme is: by two-layer radon gas accumulation box and detector, the prime amplifier of being sleeved on, discrimination and molding circuit constitutes the probe of surveying precipitation rate of radon, by interface circuit, computing machine, printer and high-voltage power supply composition measuring apparatus.Fig. 1 is its block scheme, it needs to be noted, the radon gas accumulation box is two coaxial installations of cylindrical tube in the probe, and top covers and seals with a flat board, lower openings, and lute is arranged, form inside and outside two chambers, inner room is a measuring chamber, and the mistress is a screened room, accumulates radon simultaneously.Because inside and outside two Room volumes are identical, so the radon amount of inside and outside chamber accumulation is also identical.So the exchange of inner room with leak be not with extraneous but and screened room, influence is just much little like this, and measuring chamber has just been played protective effect, has reduced because of leaking and exchange the error of bringing to measurement result.Owing to be directly to measure to have reduced because of getting the error of the band of gas, thereby guaranteed the order of accuarcy of measurement result.
Since be to use computer processing data, just more convenient reliable.Fig. 2 is the sonde configuration sectional view.The invention has the advantages that: adopt the double braid covering assembling structure because probe of the present invention is separated out the radon accumulation box; overcome the defective of individual layer accumulation box; more owing to do not get gas and directly measure and reduced error; guarantee and improved the accuracy of measurement; thereby this eduction rate instrument not only is used to measure building materials; soil; house sidings; surperficial precipitation rate of radon such as ground; can also be to underground engineering; the precipitation rate of radon on surfaces such as mine and tourism cavern is measured; settle accounts radon concentration with this; for taking the ventilation measure that foundation is provided; in environmental monitoring and environmental protection, play a positive role in the aspect of bringing benefit to the mankind.
The embodiment of the invention:
The probe of this invention is separated out the radon accumulation box and is adopted the cylindrical two layered cylinder of coaxial installation, constitute two cylindrical chamber, its volume is respectively 5 liters, cylindrical tube and upper cover plate material organic glass insulating material, the copper product cylindrical electrode is arranged in the inner core in fact, copper net electrode is below inner core, and the measuring chamber radial design is 100mm.
Fig. 1 is a radon eduction rate on medium furface measuring instrument block scheme, and frame of broken lines is enclosed A and is probe, and frame of broken lines B is a measurement mechanism, and probe is made of accumulation box and detector 1, prime amplifier 2 and discrimination and molding circuit 3; Measurement mechanism is made up of interface circuit 4, computing machine 5, printer 6 and high-voltage power supply 7.
Fig. 2 is the sonde configuration sectional view.
Among the figure, 1 for the accumulation box upper cover plate, 2 for the accumulation box screened room, 3 for measuring chamber, 4 for the cylinder copper electrode, 5 for shielding box cover, 6 at the bottom of the box detector, 7 be O-ring seal for shielding box inner cap, 16 for shielding box enclosing cover, 18 and 19 for screw, 15 for prime amplifier inner screening box, 14 and 17 for prime amplifier external shield box, 13 for packing ring, 12 for pressure ring, 11 for copper net electrode, 10 for measuring chamber seat, 9 for copper shield box, 8.
Claims (1)
1, a kind of radon eduction rate on medium furface measuring instrument comprises the probe that is made of radon gas accumulation box, detector, prime amplifier, discrimination and molding circuit and is made up of measurement mechanism two parts that interface circuit, computing machine, printer, high-voltage power supply constitute; The volume that the invention is characterized in the double-deck accumulation box of employing, the coaxial installation of double-deck accumulation box, inside and outside two Room of double-deck accumulation box in the probe segment is identical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91109913 CN1029532C (en) | 1991-10-09 | 1991-10-09 | Method and instrument for measuring radon eduction rate on medium furface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91109913 CN1029532C (en) | 1991-10-09 | 1991-10-09 | Method and instrument for measuring radon eduction rate on medium furface |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1071260A CN1071260A (en) | 1993-04-21 |
| CN1029532C true CN1029532C (en) | 1995-08-16 |
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ID=4910057
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91109913 Expired - Fee Related CN1029532C (en) | 1991-10-09 | 1991-10-09 | Method and instrument for measuring radon eduction rate on medium furface |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1029532C (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102103211A (en) * | 2009-12-18 | 2011-06-22 | 北京瑞迪泰克技术有限公司 | Wound radioactivity measuring instrument |
| CN103499672B (en) * | 2013-10-16 | 2015-04-29 | 衡阳师范学院 | Method and device for optionally adjusting radon exhalation rate and effective decay constants |
| CN107219549B (en) * | 2017-05-17 | 2019-06-14 | 中国原子能科学研究院 | A kind of drop radon system for low Natural Radiation Level measuring chamber |
| CN109254314B (en) * | 2018-11-15 | 2022-06-21 | 衡阳师范学院 | With ring electrodes increasing positive charge218Po collection efficiency measurement cavity and method |
| CN109307880B (en) * | 2018-11-15 | 2022-08-12 | 衡阳师范学院 | Multiple electrode positive charging 218 Po collection efficiency measurement cavity and method |
| CN109254313B (en) * | 2018-11-15 | 2022-08-12 | 衡阳师范学院 | Multiple detectors for increasing positive charge 218 Po collection efficiency measurement cavity and method |
| CN109655859B (en) * | 2018-12-14 | 2022-08-12 | 衡阳师范学院 | Measuring instrument pair with multiple detectors for improving radon exhalation rate 218 Po collection efficiency measurement cavity and method |
| CN109655857B (en) * | 2018-12-14 | 2022-06-21 | 衡阳师范学院 | Measuring instrument pair for improving radon exhalation rate by annular electrode218Measuring cavity and method for Po collection efficiency |
| CN109655858B (en) * | 2018-12-14 | 2022-08-12 | 衡阳师范学院 | Multi-electrode measuring instrument pair for improving radon exhalation rate 218 Po collection efficiency measurement cavity and method |
| CN113238272A (en) * | 2021-04-27 | 2021-08-10 | 赛睿环仪(北京)科技有限公司 | Radon exhalation rate measuring instrument |
-
1991
- 1991-10-09 CN CN 91109913 patent/CN1029532C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1071260A (en) | 1993-04-21 |
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