CN2078881U - radon detector with electret - Google Patents
radon detector with electret Download PDFInfo
- Publication number
- CN2078881U CN2078881U CN 90209932 CN90209932U CN2078881U CN 2078881 U CN2078881 U CN 2078881U CN 90209932 CN90209932 CN 90209932 CN 90209932 U CN90209932 U CN 90209932U CN 2078881 U CN2078881 U CN 2078881U
- Authority
- CN
- China
- Prior art keywords
- electret
- radon
- detector
- measurement
- top cover
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 229910052704 radon Inorganic materials 0.000 title claims abstract description 31
- SYUHGPGVQRZVTB-UHFFFAOYSA-N radon atom Chemical compound [Rn] SYUHGPGVQRZVTB-UHFFFAOYSA-N 0.000 title claims abstract description 31
- 239000007787 solid Substances 0.000 claims abstract description 7
- 239000011810 insulating material Substances 0.000 claims description 3
- 238000005070 sampling Methods 0.000 abstract description 11
- 238000005259 measurement Methods 0.000 abstract description 10
- 230000035945 sensitivity Effects 0.000 abstract description 5
- 230000005684 electric field Effects 0.000 abstract description 2
- 239000010408 film Substances 0.000 description 7
- 239000011104 metalized film Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 229910001369 Brass Inorganic materials 0.000 description 2
- 239000010951 brass Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005183 environmental health Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 230000017105 transposition Effects 0.000 description 1
Landscapes
- Measurement Of Radiation (AREA)
Abstract
The utility model relates to a take radon measuring detector of electret. It is characterized in that the CR-39 solid nuclear track detector 3 is clamped between the electret 1 and the electret film and is fixed by the top cover 4 and the bottom plate 5. The electret with high surface charge density is used for forming a strong electric field for collecting radon daughters in a sampling chamber, so that the sensitivity of radon measurement is improved by hundreds of times. The utility model provides a take radon measuring detector of electret can be used to the measurement of radon concentration and the measurement of radon exhalation rate in indoor outer and the mine.
Description
The utility model belongs to the radgas fields of measurement, is specifically related to the survey radon detector with electret.
No source sampling integration is surveyed the measuring method that the radon method is the indoor and outdoor radon concentration that generally adopts of our times various countries, and it has overcome the contingency problem that grasps the sampling determination value, and its measurement result can be directly used in the environmental health evaluation.The shortcoming of this method is that sensitivity is too low, and the sampling period reaches 2-6 month.Electret assembly shown in Figure 2 forms the highfield of collecting radon daughter in the sampling cell, can improve (" HeaIth Physics ", 43,399,1982) nearly a hundred times with surveying radon sensitivity.This electret assembly is placed directly in the sampling cell 7 of metal inner surface, makes electret 1 by brass chassis 5 and double-layer aluminum-foil 8 conductive inner wall of its positive potential one side and sampling cell 7 be electrically contacted (ground connection); Double sticky tape 9, stainless steel substrates 10 and be wrapped in negative potential one side contacts of metallized film 11 with the electret 1 of CR-39 solid state nuclear track detector 3, and in sampling cell 7, form the electric field of collection radon daughter; 4 of the brass top covers of fixed electrode 1 can not contact with stainless steel substrates 10 and metallized film 11.The shortcoming of this electret detector assembly is that numerous conductor parts easily makes electret 1 short circuit and lost efficacy, and influences the reliability of this detector; It is fixing that the CR-39 detector 3 that is wrapping with metallized film 11 is depended merely on deadweight, landing easily in transportation; The contact condition that metallized film 11 and CR-39 detector are 32 is difficult to control, influences the consistance of measurement result; The surface area of collecting radon daughter is too big, and diameter reaches 5 centimetres, has reduced the track density on the CR-39 detector 3, needs the sampling cell of big (10 liter) of volume.
The purpose of this utility model is to design the survey radon detector of a kind of reliable operation, band electret simple in structure.
The survey radon detector of the novel band electret that the utility model provides as shown in Figure 1, it is made of electret 1, electrifying film 2, CR-39 solid state nuclear track detector 3, top cover 4 and chassis 5, it is characterized in that CR-39 detector 3 is clipped between electret 1 and the electrifying film 2 and fixing, can prevent transposition in the long-distance transport by top cover 4 and chassis 5; The noble potential of electret 1 produces induced charge on CR-39 detector 3, the graviational interaction of this electric charge and electrifying film 2 makes the surface of contact driving fit between electret 1, CR-39 solid state nuclear track detector 3 and electrifying film 2 threes, can keep stable collection efficiency of radon daughter and the detection efficiency particle-stabilised to α; Top cover 4 and chassis 5 are insulating material and make; But the surface charge long preservation of electret and electrifying film keeps the saturation collection efficient to radon daughter; Dwindled the area (diameter is less than 4 centimetres) of collecting radon daughter, improved track density and surveyed radon sensitivity.
The utlity model has the advantage of reliable operation simple in structure.
As an example, bottom introduces one, and to collect surface diameter be the good effect of obtaining in 2 centimetres the making of electret body examination radon detector and actual the use.
As shown in Figure 1, electret 1 is the F46 plastic foil of one deck 200 micron thickness, and electrifying film 2 is the F46 plastic sheeting of 15 micron thickness, CR-39 solid state nuclear track detector 3 is clipped in uses top cover 4 and chassis 5 pressing and fixing gently between electret 1 and the electrifying film 2 again.Filling polyfoam 6 then between electret 1 and the chassis 5.Top cover 4 is middle disk with holes, and disk is high 1 centimetre, and the aperture of disk central authorities equates (2 centimetres), 6 centimetres of disk external diameters, 5.7 centimetres of internal diameters with the collection surface diameter.Chassis 5 matches with top cover, also is the shallow disk of peripheral projection, and its external diameter equates (5.7 centimetres) with the internal diameter of top cover 4.Top cover 4 and chassis 5 make by insulating material.Present embodiment is promptly formed by above-mentioned component-assembled.After this electret body examination radon detector assembles, the bottom of the common 3.8 liter passive sampling cells 7 of can packing into.During radon inside and outside measuring chamber or in the mine, the measurement lower limit of radon exposed amount is 17 Becquerels hour/meter, has improved 500 times than the sensitivity of conventional method.Sampling period, the detection limit of measuring radon concentration was 0.35 Becquerel/rice when being 2 days.Electret body examination radon detector provided by the utility model is highly sensitive, reliable results, noiseless, simple in structure, easy to use, can be used for the measurement of radon concentration in indoor and outdoor and the mine, the radon measurement in the measurement of building materials and tailing dam precipitation rate of radon and the various rugged surroundings (as containing corrosive gas).
Claims (2)
1. survey radon detector with electret, it is made of electret 1, electrifying film 2, CR-39 solid state nuclear track detector 3, top cover 4 and chassis 5, it is characterized in that CR-39 solid state nuclear track detector 3 is clipped between electret 1 and the electrifying film 2, and fixing by top cover 4 and chassis 5.
2. make by insulating material on top cover 4 according to claim 1 and chassis 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90209932 CN2078881U (en) | 1990-07-12 | 1990-07-12 | radon detector with electret |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90209932 CN2078881U (en) | 1990-07-12 | 1990-07-12 | radon detector with electret |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2078881U true CN2078881U (en) | 1991-06-12 |
Family
ID=4889897
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 90209932 Expired - Lifetime CN2078881U (en) | 1990-07-12 | 1990-07-12 | radon detector with electret |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2078881U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103487824A (en) * | 2013-09-26 | 2014-01-01 | 东华理工大学 | Radon daughter sampling device based on high-voltage corona discharge |
| RU174188U1 (en) * | 2016-12-19 | 2017-10-06 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Тверской государственный технический университет" | ELECTRIC GAS ANALYZER |
-
1990
- 1990-07-12 CN CN 90209932 patent/CN2078881U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103487824A (en) * | 2013-09-26 | 2014-01-01 | 东华理工大学 | Radon daughter sampling device based on high-voltage corona discharge |
| CN103487824B (en) * | 2013-09-26 | 2016-07-06 | 东华理工大学 | A kind of radon daughter sampling apparatus based on high-voltage corona discharge |
| RU174188U1 (en) * | 2016-12-19 | 2017-10-06 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Тверской государственный технический университет" | ELECTRIC GAS ANALYZER |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C15 | Extension of patent right duration from 15 to 20 years for appl. with date before 31.12.1992 and still valid on 11.12.2001 (patent law change 1993) | ||
| RN01 | Renewal of patent term | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |