CN2567589Y - Radioactive activity measuring meter - Google Patents
Radioactive activity measuring meter Download PDFInfo
- Publication number
- CN2567589Y CN2567589Y CN 02243278 CN02243278U CN2567589Y CN 2567589 Y CN2567589 Y CN 2567589Y CN 02243278 CN02243278 CN 02243278 CN 02243278 U CN02243278 U CN 02243278U CN 2567589 Y CN2567589 Y CN 2567589Y
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- China
- Prior art keywords
- battery
- ionization chamber
- well
- type ionization
- current amplifier
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Abstract
The utility model relates to a radioactive activity measuring meter which can measure the activity of a radionuclide, and belongs to a measuring instrument. A casing is provided with a well type ionization chamber, a battery and a current amplifier. The well type ionization chamber and the battery are assembled on an upper disc. The current amplifier is arranged on a lower disc. An aluminum tube is adopted as the wall of the well type ionization chamber. The high voltage used by the electrode is provided by the battery. The battery is composed of a cylinder polytetrafluoroethylene insulating frame, cells and a spring, and connection plates are arranged at both ends of the battery. The well type ionization chamber, the battery and the current amplifier are all arranged inside the casing, and the whole casing is completely enclosed and is charged with a dry gas. The utility model can measure the activity of the radionuclides of hundred kinds, the lower limit of radiant energy measured is cut down to 13 keV, and the lower limit of a measuring range is cut down to 3.7 kbq.
Description
Affiliated technical field
The utility model relates to a kind of radioactivity meter, belongs to Application of Nuclear Technology, measurement instrument field.
Background technology
The radioactivity meter is a kind of measurement instrument of measuring radionuclide specific activity.Present known activity meter sensor is to have measuring well, electrode and inert gas filled well-type ionization chamber.After radiation enters well-type ionization chamber, make gas ionization, it is right to produce negative ions, and ion pair to the positive and negative electrode drift, forms ionization current under action of high voltage.The relating to parameters of ionization current size and radionuclide specific activity, radiation intensity, energy and well-type ionization chamber.Ionization current is by COMPUTER CALCULATION and convert activity to.At first, must set up the ionization current of every kind of radioactive nuclide generation and the scale-up factor of activity, could convert the ionization current that measures to activity.Because the kind of radioactive nuclide is a lot, radionuclide decay mode, discharging radiation kind and emittance have nothing in common with each other.To all set up the scale-up factor of ionization current and activity to each radioactive nuclide, difficult to belong to, if all being set up a cover scale-up factor, every activity meter product can't accomplish.So necessarily require the activity meter product that good consistance is arranged, only in this way, set up a cover radioactive nuclide ionization current and an activity scale-up factor by theoretical combining with demarcation, just can supply with all products and use.Otherwise just can only utilize the standard radionuclide source to demarcate one by one.But the standard radionuclide source seldom, utilizes radioactivity meter measurable kernel element that this method produces also seldom; Secondly, the emittance lower limit of measurement is low, and the low energy response will be got well; The 3rd, radioactivity metering journey lower limit is low, that is to say that the low-activity value that measures is as far as possible little.This just requires amplifier gain to want high, and leakage current is little, and noise is low.Therefore, higher to the activity meter manufacture process requirement, the manufacturing technology difficulty is bigger.The radioactivity meter well-type ionization chamber borehole wall is made with stainless steel at present, and stainless steel absorbs strong to low-energy radiation, and low-energy radiation is difficult to penetrate, and can only lean on the attenuate thickness of shaft wall, measures the energy lower limit to reduce.The too thin borehole wall makes machining precision reduce the homogeneity of product variation; Owing to run into these problems, existing radioactivity meter can only be measured more than ten kind of nucleic activity, is limited to 25keV under the measuring radiation energy, is limited to 370KBq under the range.
Summary of the invention
Decide radioactive nuclide quantity in order to increase existing radioactivity instrumentation, reduce measuring radiation energy and range lower limit, improve homogeneity of product, the utility model provides a kind of radioactivity meter, and this radioactivity meter makes that the radioactive nuclide quantity of mensuration increases, emittance and the range lower limit reduces, homogeneity of product improves.
The utility model solves technical scheme that its technical matters adopts: well-type ionization chamber, electric battery and current amplifier are contained in the shell, well-type ionization chamber and electric battery are contained on the disk, current amplifier is contained on the lower disc, and well-type ionization chamber adopts aluminum pipe to make the borehole wall.Because the density of aluminium is low, low-energy radiation responds, and the energy lower limit of detection is low.Aluminium can relax the thickness of shaft wall requirement, and machining precision can improve like this, and homogeneity of product improves.Just can set up the ionization current of a lot of radioactive nuclides of a cover and the scale-up factor of activity, use for every product; The high voltage that electrode uses is provided by electric battery, and electric battery is made up of cylindrical teflon insulation frame, battery and spring, and terminal block is equipped with at two ends.This layout has reduced the wire length between well-type ionization chamber, electric battery, the current amplifier, thereby has reduced noise; Electric battery and current amplifier are packed into behind the shell, and whole casing is hermetically sealed and be filled with dry gas.In order to moistureproof, minimizing leakage current, reduction noise.By the gain that above measure just can improve current amplifier, reduce the lower limit of radioactivity metering journey.Current amplifier is divided into seven grades, and gain inequality is ten times between shelves, is measured by the computer control fluid drive.
The useful technique effect of the utility model is: can measure hundreds of radioactive nuclide, the emittance lower limit of mensuration drops to 13keV, and the range lower limit drops to 3.7KBq.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further specified.
Fig. 1 is the utility model structural representation.
Fig. 2 is a radioactivity meter electric battery sectional view.
Among the figure, 1. measuring well, 2. well lid, 3. shell, 4. well-type ionization chamber is 5. gone up disk, 6. electric battery, 7. lower disc, 8. current amplifier, 9. base, 10. socket, 11. upper wiring boards, 12. batteries, 13. insulating frames, 14. springs, 15. times terminal blocks.
Embodiment
In Fig. 1, radioactive nuclide to be measured is put into measuring well (1), the radiation of emitting is passed the aluminum pipe borehole wall and is entered well-type ionization chamber (4), the aluminum pipe borehole wall can make more low-energy radiation enter, the generation negative ions is right, ion pair forms ionization current and guides to current amplifier (8), but change and zoom into measurement voltage signal under electric battery (6) action of high voltage.Computing machine is sought shelves automatically and is gathered voltage signal, calculates ionization current according to voltage signal and amplifier gain.Go out activity according to this radioactive nuclide ionization current that pre-deposits computing machine and activity ratio coefficient calculations.Well lid (2) and shell (3) are the steel protective seam, are filled with encapsulant between well-type ionization chamber (4) and the shell (3), to guarantee the fixing and sealing of well-type ionization chamber (4).Well-type ionization chamber (4) and electric battery (6) are installed on the disk (5), and current amplifier (8) is installed on the lower disc (7).The lead-in wire of well-type ionization chamber (4) electrode is received on the current amplifier (8), is connected with socket (10) through current amplifier (8).Be connected with computing machine by socket (10).Be added with O-ring seal between base (9) and the shell (3).
Electric battery (6) and current amplifier (8) are packed into behind the shell (3), and whole casing (3) is hermetically sealed and be filled with dry gas.
In embodiment illustrated in fig. 2, the battery (12) in the electric battery (6) is contained in cylindrical teflon insulation frame (13) lining, and insulating frame adopts polytetrafluoroethylmaterial material, and leakage current is little, the power supply good stability.Upper and lower terminal block (11,15) and spring (14) are equipped with in battery (12) two ends, guarantee that battery (12) is electrically connected reliably and is integral.
Claims (3)
1. radioactivity meter, have measuring well, electrode and inner inert gas filled well-type ionization chamber, it is characterized in that: well-type ionization chamber, electric battery and current amplifier are contained in the shell, well-type ionization chamber and electric battery are contained on the disk, current amplifier is contained on the lower disc, and well-type ionization chamber adopts aluminum pipe to make the borehole wall.
2. radioactivity meter according to claim 1 is characterized in that: electric battery is made up of cylindrical teflon insulation frame, battery and spring, and terminal block is equipped with at two ends.
3. radioactivity meter according to claim 1 is characterized in that: electric battery and current amplifier are packed into behind the shell, and whole casing is hermetically sealed and be filled with dry gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02243278 CN2567589Y (en) | 2002-07-23 | 2002-07-23 | Radioactive activity measuring meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02243278 CN2567589Y (en) | 2002-07-23 | 2002-07-23 | Radioactive activity measuring meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2567589Y true CN2567589Y (en) | 2003-08-20 |
Family
ID=33715572
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02243278 Expired - Fee Related CN2567589Y (en) | 2002-07-23 | 2002-07-23 | Radioactive activity measuring meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2567589Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101806910A (en) * | 2010-05-11 | 2010-08-18 | 西北核技术研究所 | Method and device for absolutely measuring for radioactive gas nuclide activity |
| CN103135118A (en) * | 2011-11-25 | 2013-06-05 | 中国原子能科学研究院 | Gamma radioactive source absolute activity measuring method |
| CN113703030A (en) * | 2021-07-12 | 2021-11-26 | 中国核电工程有限公司 | Ionization chamber detector for measuring Kr-85 radioactive concentration |
-
2002
- 2002-07-23 CN CN 02243278 patent/CN2567589Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101806910A (en) * | 2010-05-11 | 2010-08-18 | 西北核技术研究所 | Method and device for absolutely measuring for radioactive gas nuclide activity |
| CN101806910B (en) * | 2010-05-11 | 2012-07-18 | 西北核技术研究所 | Method for absolutely measuring for radioactive gas nuclide activity |
| CN103135118A (en) * | 2011-11-25 | 2013-06-05 | 中国原子能科学研究院 | Gamma radioactive source absolute activity measuring method |
| CN103135118B (en) * | 2011-11-25 | 2015-04-29 | 中国原子能科学研究院 | Gamma radioactive source absolute activity measuring method |
| CN113703030A (en) * | 2021-07-12 | 2021-11-26 | 中国核电工程有限公司 | Ionization chamber detector for measuring Kr-85 radioactive concentration |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |