CN87206967U - Probe for neutron water measuting instrument - Google Patents
Probe for neutron water measuting instrument Download PDFInfo
- Publication number
- CN87206967U CN87206967U CN 87206967 CN87206967U CN87206967U CN 87206967 U CN87206967 U CN 87206967U CN 87206967 CN87206967 CN 87206967 CN 87206967 U CN87206967 U CN 87206967U CN 87206967 U CN87206967 U CN 87206967U
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- neutron
- probe
- instrument
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Abstract
The utility model discloses a neutron probe, in particular to being suitable for being used as a probe for a surface type neutron moisture testing apparatus, which is characterized in that the utility model comprises a neutron reflector, a fast neutron moderation body and a thermal neutron absorber, and a front protective plate adopts wear-resistant materials with low absorption rate for neutrons. The typical measurement precision can reach 0.3% with neutron sources of 300 mCi.
Description
The utility model is a kind of novel high-sensitivity surface type Neutron Moisture instrument probe, belongs to the Application of Nuclear Technology instrument.
In commercial production, need to measure the moisture of material.The fluctuation of coke moisture directly influenced conditions of blast furnace and furnace temperature during for example ironmaking was produced.The fluctuation of furnace temperature not only is related to the fluctuation of pig iron sulfur content and silicon content, influences iron quality, also increases coke ratio and energy consumption.In order to realize measuring exactly continuously material moisture, utilizing neutron measurement moisture is efficient ways.
At present used Neutron Moisture instrument probe divides two kinds of plug-in type and surface-types.Plug-in type is probe to be inserted in the material measure, because probe contact measured material, the easy petty damage of protective casing causes detector to damage or radioactive sources lost, and installation and maintenance are inconvenience very.
The probe of surface-type Neutron Moisture instrument is installed in material bin wall outside surface to be measured, has overcome the various shortcoming of above-mentioned plug-in type Neutron Moisture instrument.But the probe size of this instrument is bigger in the world at present, and weight is heavier, the also stronger and unshielded design of radioactive source.The Neutron Moisture instrument usually need to be contained in the rigorous environment (, high-altitude narrow, dust concentration big etc.) as working space therefore above-mentioned shortcoming just limited its range of application.
The purpose of this utility model is exactly to develop a kind of probe of new construction, and it is little to make it have size, in light weight, and radiation intensity is little, and surface dose rate is low, and precision height and installation and maintenance are simple, is easy to protection, the characteristics of applied range.
The utility model is finished by following proposal:
1. for reducing the intensity of radioactive source, reduce the neutron leakage amount of detecting head surface, thereby be beneficial to protection and application, and reduce cost, we have adopted the fast neutron reflecting body in the sonde configuration design, the fast neutron that radioactive source is launched is through the reflecting body reflection, and the fast neutron flux in the directive tested material increases.Reflecting body can be made into the garden plate-like, and the bottom is thick, and periphery is thin.Shown in accompanying drawing 1..Available general steel plate or materials such as boron steel or graphite are made.
2. be protection neutron source; again the absorption of neutron being reduced to minimum; to increase the thermal neutron concentration at detector place; the fender little and wear-resisting to the neutron absorption coefficient has been installed before probe; get over Bao Yuehao under the condition that its thickness allows at the scene, it is principle that material is reduced to minimum and wear-resisting with the absorption to neutron.As aluminium oxide or cast stone.
3. for improving detection efficiency, we have adopted high sensitivity thermal neutron detector such as 3He counter tube or BF3 counter tube, four in parallel uses, and it measures sensitivity, and to reach the thermal neutron counting rate that one of every variation percentage of moisture causes be 40--70/second.
4. for reducing probe size, reduce the neutron leakage amount on probe inoperative surface, be beneficial to radiation protection operating personnel.Designed fast neutron slow body and the thermal neutron absorber of making by the high hydrogenous material of lightweight in the back of reflecting body.
The slow body material is with paraffin wax or boracic paraffin wax or tygon or organic glass or plastics.The absorber material is with borax or cadmium plate.
The neutron probe made from the utility model has that volume is little, in light weight, and neutron source strength is little, and the neutron leakage amount is little, the measuring accuracy advantages of higher.
Accompanying drawing 1 reflecting body synoptic diagram.
Accompanying drawing 2 neutron probe instrument synoptic diagram.
Wherein: 1--neutron source 2--counter tube 3--reflecting body 4--wear-resistant protection plate 5--slow body 6--absorber 7--protective cover.
Embodiment: the neutron probe of making according to the utility model is shown in accompanying drawing 2..The about ∮ 300 * 300MM(of overall dimensions and 2500 * type of U.S. Kay-Ray company is ∮ 500 * 500mm); The about 75Kg of heavy 35--40Kg(2500x type); The reflecting body steel plate of 4--7 cm thick, slow body is protected with the alumina plate of purity more than 90% with the parallel connection of four BF3 pipes with the thick cadmium plate of 1--2MM, detector with the tygon of ∮ 296 * 200, absorber, and thick is 5～15MM.With the 241AM-BE neutron source of 300 millicuries, typical measuring accuracy is 0.3%.Inoperative surface leakage dose rate be 2.2 mrems/hour, (and the 2500X type is with 500 millicurie sources, typical accuracy 0.5%, leakage agent dose rate 7.5 mrems/hour).
Claims (3)
1, a kind of nuclear instrument neutron probe; be specially adapted to measure the high-sensitivity surface type Neutron Moisture instrument probe of material moisture; by neutron source; thermal neutron detector; protective cover is formed; it is characterized in that having adopted the fast neutron reflecting body in the probe, the fender before the probe has adopted the anti-petty material little to the neutron absorption coefficient, and fast neutron slow body and thermal neutron absorber that high hydrogeneous light material is done have been installed in protective cover.
2,, it is characterized in that reflector material is general steel plate or boron steel or graphite as the described neutron probe of claim 1.; Fender is alumina plate or cast stone; Slow body is high hydrogeneous light material tygon or paraffin wax or boracic paraffin wax or organic glass or plastics, and the thermal neutron absorber of employing is cadmium plate or borax.
3, as claim 1. or 2. described neutron probe, the steel plate thickness that it is characterized in that the fast neutron reflecting body is 2--7CM, fender be content more than 90%, thickness is the alumina plate of 5--15mm; The fast neutron slow body is the PEF of ∮ 296 * 200MM, and thermal neutron absorber is the cadmium plate of 1--2MM.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87206967 CN87206967U (en) | 1987-05-04 | 1987-05-04 | Probe for neutron water measuting instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87206967 CN87206967U (en) | 1987-05-04 | 1987-05-04 | Probe for neutron water measuting instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN87206967U true CN87206967U (en) | 1988-03-30 |
Family
ID=4822461
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 87206967 Expired - Lifetime CN87206967U (en) | 1987-05-04 | 1987-05-04 | Probe for neutron water measuting instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN87206967U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1761872B (en) * | 2003-03-14 | 2010-12-15 | 力技术 | A method and an apparatus for detecting water on a ship's deck |
| WO2011079495A1 (en) * | 2009-12-29 | 2011-07-07 | 同方威视技术股份有限公司 | Fast neutron detection method, substance discrimination method and neutron detector |
| CN103163167A (en) * | 2011-12-15 | 2013-06-19 | 中国核动力研究设计院 | Neutron moisture gauge detector |
| CN107884810A (en) * | 2017-11-27 | 2018-04-06 | 中核控制系统工程有限公司 | A kind of personal dose alarm of neutron detection device and the application device |
| CN108051465A (en) * | 2018-01-26 | 2018-05-18 | 吉林大学 | A kind of Atomic Absorption SpectrophotometerICP neutron activation wink sent out gamma ray deferred and combined |
| CN110320224A (en) * | 2019-08-08 | 2019-10-11 | 中国科学技术大学 | Concrete failure detector and defectoscope |
-
1987
- 1987-05-04 CN CN 87206967 patent/CN87206967U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1761872B (en) * | 2003-03-14 | 2010-12-15 | 力技术 | A method and an apparatus for detecting water on a ship's deck |
| WO2011079495A1 (en) * | 2009-12-29 | 2011-07-07 | 同方威视技术股份有限公司 | Fast neutron detection method, substance discrimination method and neutron detector |
| CN103163167A (en) * | 2011-12-15 | 2013-06-19 | 中国核动力研究设计院 | Neutron moisture gauge detector |
| CN107884810A (en) * | 2017-11-27 | 2018-04-06 | 中核控制系统工程有限公司 | A kind of personal dose alarm of neutron detection device and the application device |
| CN108051465A (en) * | 2018-01-26 | 2018-05-18 | 吉林大学 | A kind of Atomic Absorption SpectrophotometerICP neutron activation wink sent out gamma ray deferred and combined |
| CN110320224A (en) * | 2019-08-08 | 2019-10-11 | 中国科学技术大学 | Concrete failure detector and defectoscope |
| CN110320224B (en) * | 2019-08-08 | 2021-10-01 | 中国科学技术大学 | Concrete flaw detector and flaw detector |
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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 |