CN85201083U - Thermal neutron-gamma rag transmissive inspection facilities - Google Patents
Thermal neutron-gamma rag transmissive inspection facilities Download PDFInfo
- Publication number
- CN85201083U CN85201083U CN 85201083 CN85201083U CN85201083U CN 85201083 U CN85201083 U CN 85201083U CN 85201083 CN85201083 CN 85201083 CN 85201083 U CN85201083 U CN 85201083U CN 85201083 U CN85201083 U CN 85201083U
- Authority
- CN
- China
- Prior art keywords
- gamma
- neutron
- thermal neutron
- rays
- processing system
- 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.)
- Ceased
Links
Images
Abstract
The utility model discloses a thermal neutron-gamma-rays transmittance detection device which belongs to the technical field of the application of nuclear technology, comprising a bundle transmitting apparatus of thermal neutron and gamma-rays, a probe and a signal processing system. The utility model simultaneously utilizes the neutrons and gamma-rays of Am-Be sources and uses only one lithium glass scintillation detector for detection. A data processing system simultaneously gives two physical quantity of one sample, such as the moisture and density of mix material. The utility model not only sufficiently exerts the functions of the Am-Be sources and the lithium glass but also carries out high accurate measurement.
Description
The invention belongs to the Application of Nuclear Technology field, proposed a kind of radioactive isotope detecting instrument.
The thermal neutron transmissometer of general design is formed (referring to atomic energy science technology, the 2nd phase, nineteen eighty-three, Beijing, Wang Shuxin, Liu Shengkang, thermal neutron transmissometer and application thereof, 201-205 page or leaf) by isotope neutron source, deceleration body, neutron detector and number system at present.Therefore the neutron that it only utilizes the neutron source emission, can only detect a physical quantity (for example moisture).But the variation of another physical quantity can influence the value (for example sample rate changes the measured value that can influence moisture) of the physical quantity of surveying, so the precision of thermal neutron transmissometer and purposes are subjected to certain restriction.The instrument that also has a kind of energy measurement coke moisture and two amounts of density uses intense source (fast neutron and gamma-rays), and radioactivity is strong, and price is very expensive.
Existing gamma-rays transmissometer is formed (referring to a collection of selected materials of nuclear technology achievement, nineteen eighty-three, Beijing, the JSHM-1 of Yingkou City Electronic Instruments Plant type gamma-ray density meter, 282-283 page or leaf) by isotope gamma ray projector, gamma-ray probe and number system.It can measure a physical quantity relevant with sample rate.Also can influence the measured value of density when equally, other physical quantitys of sample change.
Task of the present invention is a kind of method and the device thereof of two physical quantitys of test sample simultaneously of research.
Technical solution of the present invention is to utilize the neutron and the gamma-rays of neutron source emission simultaneously, measure thermal neutron and gamma-rays simultaneously with same probe, utilize the thermal neutron of probe output and the amplitude difference of gamma-rays signal, provide thermal neutron and gamma-ray counting rate respectively, after data processing, provide the value of two physical quantitys (for example, moisture and density) of same sample.The present invention has designed the device of a kind of thermal neutron and gamma-rays transmission detection, bundle emitter with an energy heat of emission neutron beam and beam,gamma-ray, survey thermal beam and beam,gamma-ray simultaneously with a detector (for example lithium glass probe), the signal processing system of this device has two single-channel analyzers, inserts the numeric results that microcomputer interface can directly obtain physical quantity from microcomputer.
Invention is further specified by embodiment below by accompanying drawing.
This schematic representation of apparatus of figure expression.
(1) is neutron source; (2) be the deceleration body; (3) be screen layer;
(4) be the bundle emitter; (5) be hydraucone; (6) be silo;
(7) be the thermal neutron collimating apparatus; (8) be neutron filter on the cadmium;
(9) be the gamma-rays collimating apparatus; (10) be panel; (11) be sample;
(12) be probe; (13) be probe bracket; (14) be cable;
(15) be signal processing system; (16) be amplifier; (17) be single-channel analyzer;
(18) be scaler (or microcomputer interface); (19) be microcomputer;
(20) be power supply.
This device is made up of bundle emitter (4), sample (11), probe (12) and signal processing system.
Bundle emitter (4) comprises neutron source (1), deceleration body (2), screen layer (3) and silo (6).Neutron source adopts Am-Be neutron source, and its intensity is determined according to the requirement of measuring accuracy, is generally 0.1-1.0Ci.The deceleration body is used neutron degradation, adopts paraffin or other moderator, and profile can be right cylinder, and diameter is about 36cm, highly is about 28cm.Screen layer is in order to weaken leaking dose, adopts boracic paraffin to add iron-clad, and boracic paraffin layer thickness is greater than 5cm, and the thick about 3mm of iron-clad is highly with the deceleration body.Silo is the measure of heat of emission neutron and beam,gamma-ray.Wellhole is 2.5～5cm, well depth 5～8cm.Bottom hydraucone (5) is in order to increase the surface of emission of thermal neutron.Silo top is made up of thermal neutron collimating apparatus (7) and gamma-rays collimating apparatus (9), and epithermal neutron filtrator (8) and panel (10) also can be housed.Wherein, the thermal neutron collimating apparatus is the cadmium plate of center drilling, the about 1mm of thickness, the same wellhole in aperture.The gamma-rays collimating apparatus is the stereotype or the iron plate of center drilling, the about 5mm of thickness, the same wellhole in aperture.The epithermal neutron filtrator is cadmium plate movably, the about 1mm of thickness, and area is greater than wellhole.This filtrator is measured standby for cadmium difference method.Aboveground panel is an aluminum, and sample is placed on the position that indicates on the panel.
Sample (11) is preferably taked cylindrical shape, the same wellhole of diameter.Can directly process for solid material; For powdery or fluent material, can be contained in the sample box of aluminum.
Probe (12) adopts the cylinder case of aluminum, interior dress lithium glass scintillator, photomultiplier and prime amplifier.Probe is fixing by support (13), aims at the sample center.The preferably same wellhole of the diameter of lithium glass.For the big environment of thermal neutron background, probe outsourcing cadmium sheet.The detected signal of popping one's head in is passed to main frame with cable (14).
Signal processing system (15) comprises amplifier (16), two single-channel analyzers (17), two scaler (or microcomputer interface) (18), a microcomputer (19) and power supply (20).By the signal of probe input, after amplifying, import two single-channel analyzers.Because thermal neutron is different with gamma-ray signal amplitude, single-channel analyzer adopts different discrimination thresholds up and down, thereby can obtain thermal neutron and gamma-ray counting rate respectively.Thermal neutron transmissivity T
n(m, ρ), gamma-rays transmissivity T
r(m, ρ), variable m forms relevant physical quantity with sample in the function, and ρ is the physical quantity relevant with density.Separate this two functional equations by microcomputer, provide at last the value of two the physical quantity m and the ρ of sample simultaneously.
The T that general thermal neutron transmissometer is measured by experiment
nWhen determining physical quantity m, be that supposition ρ is a constant.The gamma-rays transmissometer is measured T by experiment
rWhen determining physical quantity ρ, be that supposition m is a constant.But in fact two amounts of the m of sample and ρ often all are variablees, and the variation of an amount can influence the measured value of another amount.So the precision of single parameter measurement is not high.
The invention has the advantages that and measure simultaneously Tn(m, ρ) and Tr(m, ρ), thereby can More accurately to determine simultaneously two kinds of variable m and ρ. So the advantage of this device has not only been given full play to the effect of Am-Be source and lithium glass, and can carry out the measurement of degree of precision.
Can adopt 300mCi Am-Be neutron source, the lithium glass of φ 40 * 3mm is joined GDB-44 type photomultiplier. Thermal neutron-gamma rag transmissive inspection facilities as shown has been installed. Be used for measuring moisture and the density of compound sample. Sample box is the aluminium box, diameter 4cm, height 3cm.
Claims (4)
1, a kind of device of Application of Nuclear Technology, form by radioactive source, probe and signal processing system etc., it is characterized in that having the beam,gamma-ray emitter [4] of a heat of emission neutron beam, the signal processing system that lithium glass is popped one's head in and surveyed thermal beam and beam,gamma-ray simultaneously and have two single-channel analyzers.
2, device according to claim 1 is characterized in that restrainting emitter (4) and is made up of neutron source (1), deceleration body (2), screen layer (3) and silo (6).
3, device according to claim 1 and 2 is characterized in that the wellhole of silo (4) is got 2～5cm, and well depth is 5～8cm, and top is thermal neutron collimating apparatus (7), gamma-rays collimating apparatus (9).
4, device according to claim 1 and 2 is characterized in that stereotype or iron plate that center drilling is equipped with on silo (6) top, and the aperture is with the gamma-rays collimating apparatus of making of emission wellhole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85201083 CN85201083U (en) | 1985-04-01 | 1985-04-01 | Thermal neutron-gamma rag transmissive inspection facilities |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85201083 CN85201083U (en) | 1985-04-01 | 1985-04-01 | Thermal neutron-gamma rag transmissive inspection facilities |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN85201083U true CN85201083U (en) | 1986-02-05 |
Family
ID=4797233
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 85201083 Ceased CN85201083U (en) | 1985-04-01 | 1985-04-01 | Thermal neutron-gamma rag transmissive inspection facilities |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN85201083U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101349661B (en) * | 2008-09-17 | 2011-10-05 | 丹东东方测控技术有限公司 | Method for on-line detecting coal ashes on belt |
| CN103295382A (en) * | 2013-06-24 | 2013-09-11 | 南华大学 | Gamma-ray wireless sensing monitoring apparatus and system |
| CN107561103A (en) * | 2017-09-08 | 2018-01-09 | 中国原子能科学研究院 | A kind of equipment for spent fuel storage rack boron Tube heating furnace |
| CN113866188A (en) * | 2021-08-25 | 2021-12-31 | 中国辐射防护研究院 | Device for measuring thermal neutron transmittance of shielding material |
-
1985
- 1985-04-01 CN CN 85201083 patent/CN85201083U/en not_active Ceased
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101349661B (en) * | 2008-09-17 | 2011-10-05 | 丹东东方测控技术有限公司 | Method for on-line detecting coal ashes on belt |
| CN103295382A (en) * | 2013-06-24 | 2013-09-11 | 南华大学 | Gamma-ray wireless sensing monitoring apparatus and system |
| CN107561103A (en) * | 2017-09-08 | 2018-01-09 | 中国原子能科学研究院 | A kind of equipment for spent fuel storage rack boron Tube heating furnace |
| CN113866188A (en) * | 2021-08-25 | 2021-12-31 | 中国辐射防护研究院 | Device for measuring thermal neutron transmittance of shielding material |
| CN113866188B (en) * | 2021-08-25 | 2024-04-12 | 中国辐射防护研究院 | Thermal neutron transmissivity measuring device for shielding material |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4884288A (en) | Neutron and gamma-ray moisture assay | |
| GB1426926A (en) | Analysis utilizing neutron irradiation | |
| Scott et al. | Quantitative interpretation of gamma-ray logs | |
| US2957986A (en) | Means of studying oil consumption in an engine | |
| CN101349658B (en) | Fast analysis method of coal ash separating line | |
| Been | Nondestructive soil bulk density measurements by X-ray attenuation | |
| US3508047A (en) | Method and apparatus for the accurate analysis of hydrocarbon material using a multiple of radiation sources | |
| US2983817A (en) | Neutron-capture, gamma-ray prospecting method | |
| US4171485A (en) | Apparatus for analyzing the spectral data in an elemental analyzer measuring gamma rays arising from neutron capture in bulk substances | |
| US3505520A (en) | Measuring the incombustible content of mine dust using backscatter of low energy gamma rays | |
| US4575634A (en) | Assaying composite structures | |
| CN85201083U (en) | Thermal neutron-gamma rag transmissive inspection facilities | |
| US3008047A (en) | Induced gamma activity prospecting method | |
| CN1126316A (en) | On-line measuring method and used unit for respectively measuring each content of two-component substance | |
| KR910007717B1 (en) | Method and apparatus to determine the activity volume and to estimate the plutonium mass contained in waste | |
| Thurnau | Gamma absorptiometer for solutions of heavy metal salts | |
| JPH04194772A (en) | Radiation measuring device | |
| Silvestri et al. | Laboratory and field calibration of a neutron depth moisture gauge for use in high water content soils | |
| Carver | NEUTRONS MEASURE MOISTURE IN SOLIDS | |
| AU600461B2 (en) | Neutron and gamma-ray moisture assay | |
| CN2039422U (en) | Nuclear soil bed density and moisture content detector | |
| Müller | Bulk Moisture Analysis System | |
| JPH05133873A (en) | Fissionable material detecting apparatus | |
| Brodzinski et al. | Californium-252 in situ activation and photon detection techniques for uranium ore deposit evaluation | |
| Sowerby et al. | Neutron and gamma-ray transmission technique for the on-line determination of moisture in coal and coke |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CE01 | Termination of patent right | ||
| CE01 | Termination of patent right |