CN110320224A - Concrete failure detector and defectoscope - Google Patents
Concrete failure detector and defectoscope Download PDFInfo
- Publication number
- CN110320224A CN110320224A CN201910730053.1A CN201910730053A CN110320224A CN 110320224 A CN110320224 A CN 110320224A CN 201910730053 A CN201910730053 A CN 201910730053A CN 110320224 A CN110320224 A CN 110320224A
- Authority
- CN
- China
- Prior art keywords
- shield
- neutron source
- failure detector
- detector
- neutron
- 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.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/20—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by using diffraction of the radiation by the materials, e.g. for investigating crystal structure; by using scattering of the radiation by the materials, e.g. for investigating non-crystalline materials; by using reflection of the radiation by the materials
- G01N23/20008—Constructional details of analysers, e.g. characterised by X-ray source, detector or optical system; Accessories therefor; Preparing specimens therefor
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/20—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by using diffraction of the radiation by the materials, e.g. for investigating crystal structure; by using scattering of the radiation by the materials, e.g. for investigating non-crystalline materials; by using reflection of the radiation by the materials
- G01N23/203—Measuring back scattering
- G01N23/204—Measuring back scattering using neutrons
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2223/00—Investigating materials by wave or particle radiation
- G01N2223/05—Investigating materials by wave or particle radiation by diffraction, scatter or reflection
- G01N2223/053—Investigating materials by wave or particle radiation by diffraction, scatter or reflection back scatter
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2223/00—Investigating materials by wave or particle radiation
- G01N2223/10—Different kinds of radiation or particles
- G01N2223/106—Different kinds of radiation or particles neutrons
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2223/00—Investigating materials by wave or particle radiation
- G01N2223/60—Specific applications or type of materials
- G01N2223/646—Specific applications or type of materials flaws, defects
Landscapes
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
Abstract
The invention discloses a kind of concrete failure detector, including neutron source (1), four detectors (2) and shield (3)；The neutron source (1) is set to shield (3) center, surrounding coats shield (3), and four detectors (2) are distributed on the outside of shield (3) along neutron source (1) center is circumferentially equidistant；Shield (3) radius is 15~20cm, is highly 10~15cm, and test surface is 1~2cm in front of shield (3) described in distance before the neutron source (1)；The material of the shield (3) is the polyethylene mixed with boron carbide, and boron carbide mass content is 10~15%；Described shield (3) the outer cladding lead protection layer (4), lead protection layer (4) is with a thickness of 1~2cm；The lead protection layer (4) of test surface is equipped with removable cover (5) in front of the shield (3).Detection efficient is improved, the data of detection result are analyzed with the depth of available inside concrete area defects and the information of lateral position.
Description
Technical field
The present invention relates to a kind of nuclear technology, technical field of nondestructive testing more particularly to a kind of utilization neutron anti-scattering method pair
The nondestructive inspection of reinforced concrete structure mixed solidifying native failure detector and defectoscope.
Background technique
Since neutron ray has than X, the stronger penetration power of gamma-rays most of metal material, and have to hydrogenous material
There is very strong scattering property.So neutron ray has application in many aspects: as passed through neutron radiograph check-up material
Material internal flaw, the hydrogen content in measurement steel, measures the gap inside steel and passes through the water content in measurement thermal insulation material
Neutron parsing measurement residual stress etc..
Currently with neutron anti-scattering method, to armored concrete, the technology is still immature, the shielding and detection to neutron is generated
Scheme etc. is not perfect, and the concrete failure detector that this patent proposes studies these aspects, proposes solution
Scheme.
Summary of the invention
The object of the present invention is to provide a kind of concrete failure detectors, improve detection efficient, to the data of detection result
Analyze the depth of available inside concrete area defects and the information of lateral position.
The purpose of the present invention is what is be achieved through the following technical solutions:
A kind of concrete failure detector, including 1, four detector 2 of neutron source and shield 3；
The neutron source 1 is set to 3 center of shield, and surrounding coats shield 3, and four detectors 2 are along 1 center of neutron source
It is circumferentially equidistant to be distributed in 3 outside of shield；
3 radius of shield is 15~20cm, is highly 10~15cm, distance institute before the neutron source 1
The 3 front test surface of shield stated is 1~2cm；
The material of the shield 3 is the polyethylene mixed with boron carbide, and boron carbide mass content is 10~15%；
The 3 outer cladding lead protection layer 4 of shield, lead protection layer 4 is with a thickness of 1~2cm；3 front of shield
The lead protection layer 4 of test surface is equipped with removable cover 5.
Preferably, collimator 6 is equipped in front of the shield 3.
Preferably, the neutron source 1 uses americium beryllium neutro ource, and nominal activity is 1.85GBq, neutron emission rate 1.00
×10^5n/s。
Preferably, the detector 2 uses BF3 proportional counter tube.
Preferably, 3 radius of shield is 15cm, is highly 10cm, before the neutron source 1 described in distance
3 front test surface of shield be 1cm.
Preferably, the boron carbide mass content is 10%.
A kind of defectoscope, including above-mentioned concrete failure detector.
As seen from the above technical solution provided by the invention, a kind of concrete flaw detection dress provided in an embodiment of the present invention
It sets, improves detection efficient, the data of detection result are analyzed with the depth and transverse direction of available inside concrete area defects
The information of position.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, required use in being described below to embodiment
Attached drawing be briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for this
For the those of ordinary skill in field, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is the schematic view of the front view of concrete failure detector provided in an embodiment of the present invention；
Fig. 2 is the present invention looks up structural representation of concrete failure detector provided in an embodiment of the present invention；
Fig. 3 is the neutron source structural schematic diagram of concrete failure detector provided in an embodiment of the present invention；
Fig. 4 is the backscattering particle specific gravity influence diagram of defectoscope provided in an embodiment of the present invention；
Fig. 5 is explorer count and the cavity depth relationship figure of defectoscope provided in an embodiment of the present invention；
Fig. 6 is explorer count and the empty lateral position universal relation figure of defectoscope provided in an embodiment of the present invention；
Fig. 7 is the detector array readings and cavity position relational graph one of defectoscope provided in an embodiment of the present invention；
Fig. 8 is the detector array readings and cavity position relational graph two of defectoscope provided in an embodiment of the present invention.
Specific embodiment
With reference to the attached drawing in the embodiment of the present invention, technical solution in the embodiment of the present invention carries out clear, complete
Ground description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based on this
The embodiment of invention, every other implementation obtained by those of ordinary skill in the art without making creative efforts
Example, belongs to protection scope of the present invention.
The embodiment of the present invention is described in further detail below in conjunction with attached drawing.
In terms of the surface of this patent application is covered with the concrete structure of metal material, neutron ray is because its is stronger
Penetration capacity, the steel plate for initially passing through surface enter in concrete, and then the hydrogen atom with the crystallization water in concrete scatters,
Backscattering enters detector and is detected, and can be detected to defect in concrete by the reading of detector.
Embodiment one
As shown in Figures 1 and 2, a kind of concrete failure detector, is installed on defectoscope as probe, covers suitable for surface
It is stamped the flaw detection of the concrete structure of certain thickness steel plate, including 1, four detector 2 of neutron source and shield 3；Described
Neutron source 1 is set to 3 center of shield, and surrounding coats shield 3, and four detectors 2 are distributed in along 1 center of neutron source is circumferentially equidistant
3 outside of shield.It specifically can all be installed in a matrix 7, matrix 7 can be the shell etc. of probe.Defectoscope also wraps
Some routes 8 and data acquisition interface etc. are included, computer is transferred data to, then analyzed by software, belongs to public affairs
The technology known, is no longer described in detail, and the protection scope of the present embodiment is the concrete failure detector as probe.
The neutron source 1 uses americium beryllium neutro ource 241Am-Be, and nominal activity is 1.85GBq, and neutron emission rate is
1.00×10^5n/s。
Specific americium beryllium neutro ource can choose suitable specification according to national standards, as shown in Figure 3:
φ1=16mm；φ2=10.4mm；h1=19mm；h2=10mm；
Φ1, neutron source housing outer diameter；
Φ2, neutron source radioactive area internal diameter；
h1, neutron source body height；
h2, neutron source radioactive area height；
It is below before neutron source 1, measured object to be directed toward, for detecting a flaw in Fig. 3.
Meanwhile suitable neutron emission rate can be selected when use according to the actual situation.Americium beryllium neutro ource, by national dependent part
Door approval work under supervision, neutron source 1 are located at the center of concrete failure detector, concrete failure detector centrosymmetric structure.
3 radius of shield is 15~20cm, is highly 10~15cm, generally uses diameter for 15cm, be highly
10cm can meet the requirement of this patent.Before the neutron source 13 front test surface of shield described in distance be 1~
2cm；And collimator 6 is equipped in front of the shield 3.Circular hole can be namely stayed before shield 3 with do collimator 6 it
With.The effect of collimator 6 be emit neutron source neutron in the form of narrow beam towards by flaw detection field emission, and collimator
In the presence of so that neutron enters the shielding that concrete side is subject to and reduces.This is the general structure of a common knowledge class, is being related to
It can be used, repeat no more when to all kinds of particle sources.
3 material of shield is the polyethylene mixed with boron carbide, and boron carbide mass content is 10~15%；This example
In, shield 3 is also referred to as preliminary shield, in order to detect detector neutron counting in from defects of concrete structure
Place's ratio is higher and keeps explorer count abundant, and proper shield axial width is 15cm or so, highly can be by reality
It needs to control in 10cm or so, and the boron content of material is higher, the backscattering neutron ratio that detector detects is bigger, but contains
Influence of the boron amount to the ratio is smaller compared to the influence of shielding body thickness, it is contemplated that cost, the boron carbide quality of optimal material
Content is 10% appropriate.The whole lateral section of shield 3 is annular shape, and neutron source is contained in its inner circle.
The 3 outer cladding lead protection layer 4 of shield, lead protection layer 4 is with a thickness of 1~2cm；Usual 1cm, which can satisfy, to be wanted
It asks.The lead protection layer 4 of the 3 front test surface of shield is equipped with removable cover 5.It opens when work or removes removable cover 5, not work
Removable cover 5 is closed or covered when making.Removable cover 5 is also lead, belongs to some of lead protection layer 4, rises and human body is protected not penetrated
The effect of line injury.
Four detectors 2 are distributed in the outside of shield 3 along 1 center of neutron source is circumferentially equidistant；The detector 2
Using BF3 proportional counter tube.BF3 proportional counter array is constituted, BF3 proportional counter tube is commercially available, is placed in screen
3 periphery four direction of body is covered, the counting tube quantity in adjustable each direction makes its Effect on Detecting more preferably.
Embodiment two
A kind of defectoscope, including concrete failure detector described in root embodiment one.
The course of work of defectoscope are as follows: by the concrete failure detector of defectoscope in detected object (concrete) surface,
Start to detect a flaw, by computer to the neutron counting that is detected by four groups of detectors in a period of time, and finally statistical analysis as a result,
According to explorer count and empty depth, position response diagram, object to be detected can be analyzed with the presence or absence of defect.This neutron
Backscattering detector device is suitable for the flaw detection that surface is covered with the concrete structure of certain thickness steel plate.
As shown in figure 4, selecting radial thickness is 15cm, the preliminary shield design that B4C mass content is 0.1 can make anti-
For scattering particles specific gravity up to 20%, this detector readings that neutron backscattering is detected a flaw becomes apparent from the response of defect.
It is to mix boron carbide to gather that the present invention, which has in the distinctive feature of neutron backscattering inspection field of armored concrete to material,
The selection design of the suitable thickness and boracic ratio of the preliminary shield of ethylene, and to the circumference of BF3 proportional counter detector
Four direction is equally spaced, and is finally simulated to have obtained the sound of detector array under different defects with Monte Carlo software
It answers, this makes detector readings result corresponding with obtained defect specific location is finally detected.Wherein: proper is preliminary
Shield transverse gage is 15cm or so, and the boron carbide mass content of material is 0.1 appropriate, and detector array is to defective locations
Corresponding relation figure such as Fig. 5 and Fig. 6, the explorer count result of Monte-Carlo code simulation is to normalize flux density in figure
Form is presented, and size represents the size of explorer count.
It is oblique to defect level position for four detectors in the preliminary equidistant layout design of shield excircle
Fig. 7 and Fig. 8 are shown in the response of the detector of variation and cross directional variations.
The neutron that neutron source 1 emits is largely by entering detector by flaw detection region backscattering, subrecord in this part
It by the information in flaw detection region, and does not enter there is also part neutron and is directly received by detector by flaw detection region, improve reflection
Hitting sub specific gravity can be such that detector registration and the correlation by flaw detection region with the presence or absence of cavity improves, so that it is whole to play raising
The effect of a flaw detection process efficiency.
Simulation by Monte Carlo software to practical flaw detection situation, this patent have obtained backscattering particle under flaw detection situation
With the relational graph of shield relational graph and concrete defect and detector data.Wherein such as Fig. 4 and Fig. 5, from backscattering particle ratio
Weight influence diagram can be seen that, when the internal diameter of shield is gradually increased, backscattering particle specific gravity first increases, when internal diameter is larger, instead
The growth of scattering particles specific gravity slows down and tends towards stability；And backscattering particle specific gravity is in increase state with the increase of boron content, but
It can be seen that boron content is smaller to backscattering particle specific gravity effect；But shield radius is excessive, can be lowered into spy
Survey total population of device.In summary analysis and according to the data of backscattering particle specific gravity striograph, choosing radial thickness is
The shield that 15cm and boron content are 10% or so, can achieve the effect for improving flaw detection process efficiency.
After obtaining detector data, needs to carry out data analysis and obtain a result.By the explorer count of defectoscope
It can be seen that with empty depth relationship figure such as Fig. 5: under remaining identical conditions, when empty radius increases, with empty deep
The registration reduction of the increase of degree, detector tends to exponential damping trend, and when cavity blemish depth is larger, detector registration reduces
Slow.So by flaw detection region if there is biggish defect or deeper cavity when, detector registration is smaller, instead
Establishment, and shown in such as explorer count of its corresponding relationship and empty depth relationship figure, such as Fig. 5.
And in order to be positioned to defect area, then it needs to lead to by cavity position below detector data information analysis
Cross explorer count and empty lateral position universal relation figure, such as Fig. 6, it can be seen that the empty position that single detector registration is shown
Confidence breath: when detecting cavity below defectoscope, as cavity position is gradually increased at a distance from source, the reading of detector is first
It is to be gradually increased, is then gradually reduced.When cavity position is in cavity and the interlude of detector position, the counting of detector
Up to peak, specific variation relation is as shown in the relational graph.
And by detector array readings and two figure of cavity position relationship, it can be to whole detector number if Fig. 7 and Fig. 8
It is believed that breath is analyzed: when cavity is in two neighboring detector angle region, the counting of that two detectors is generally wanted
It is gradually distance from neutron source higher than the counting of other two detectors, and with cavity position, two detectors in the region are read
Number is increased monotonically unlike remaining detector, but first increases and reduce again；When cavity is located at below four detector arrays
When, each detector readings size is inversely proportional with a distance from detector with cavity substantially.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Within the technical scope of the present disclosure, any changes or substitutions that can be easily thought of by anyone skilled in the art,
It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of claims
Subject to enclosing.
Claims (7)
1. a kind of concrete failure detector, it is characterised in that: including neutron source (1), four detectors (2) and shield (3)；
The neutron source (1) is set to shield (3) center, and surrounding coats shield (3), and four detectors (2) are along neutron source
(1) center is circumferentially equidistant is distributed on the outside of shield (3)；
Shield (3) radius is 15~20cm, is highly 10~15cm, distance institute before the neutron source (1)
Test surface is 1~2cm in front of the shield (3) stated；
The material of the shield (3) is the polyethylene mixed with boron carbide, and boron carbide mass content is 10~15%；
Described shield (3) the outer cladding lead protection layer (4), lead protection layer (4) is with a thickness of 1~2cm；The shield (3)
The lead protection layer (4) of front test surface is equipped with removable cover (5).
2. concrete failure detector according to claim 1, which is characterized in that be equipped with standard in front of the shield (3)
Straight device (6).
3. concrete failure detector according to claim 1 or 2, which is characterized in that the neutron source (1) uses americium beryllium
Neutron source, nominal activity are 1.85GBq, and neutron emission rate is 1.00 × 10^5n/s.
4. concrete failure detector according to claim 1 or 2, which is characterized in that the detector (2) uses BF3
Proportional counter tube.
5. concrete failure detector according to claim 1 or 2, which is characterized in that described shield (3) radius is
15cm is highly 10cm, and test surface is 1cm in front of shield (3) described in distance before the neutron source (1).
6. concrete failure detector according to claim 1 or 2, which is characterized in that the boron carbide mass content is
10%.
7. a kind of defectoscope, it is characterised in that: including concrete failure detector according to any one of claims 1 to 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910730053.1A CN110320224B (en) | 2019-08-08 | 2019-08-08 | Concrete flaw detector and flaw detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910730053.1A CN110320224B (en) | 2019-08-08 | 2019-08-08 | Concrete flaw detector and flaw detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110320224A true CN110320224A (en) | 2019-10-11 |
| CN110320224B CN110320224B (en) | 2021-10-01 |
Family
ID=68125750
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910730053.1A Active CN110320224B (en) | 2019-08-08 | 2019-08-08 | Concrete flaw detector and flaw detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110320224B (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87206967U (en) * | 1987-05-04 | 1988-03-30 | 首都钢铁公司 | Probe for neutron water measuting instrument |
| CN103163167A (en) * | 2011-12-15 | 2013-06-19 | 中国核动力研究设计院 | Neutron moisture gauge detector |
| RU2624144C1 (en) * | 2016-05-11 | 2017-06-30 | Публичное акционерное общество "Газпром" | Integrated equipment for survey of oil and gas wells and method of recording obtained data |
| CN206892002U (en) * | 2017-05-12 | 2018-01-16 | 肖婉琪 | A kind of concrete device for detecting water content |
| CN108152310A (en) * | 2017-11-19 | 2018-06-12 | 中山大学 | A kind of type neutron source shielding body for neutron activation experiment |
| CN108693201A (en) * | 2018-03-27 | 2018-10-23 | 深圳市中核共创科技有限公司 | A kind of measuring instrument of concrete void detection |
| CN108918565A (en) * | 2018-05-11 | 2018-11-30 | 南京航空航天大学 | A kind of sample Elemental redistribution measuring device and method based on prompt gamma ray neutron activation analysis technique |
| CN109507743A (en) * | 2018-12-04 | 2019-03-22 | 南京航空航天大学 | A kind of high-precision scanning detecting a mine device and scanning detection method |
| CN109884096A (en) * | 2019-04-11 | 2019-06-14 | 北京中百源国际科技创新研究有限公司 | A kind of neutron detection device of high security |
-
2019
- 2019-08-08 CN CN201910730053.1A patent/CN110320224B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87206967U (en) * | 1987-05-04 | 1988-03-30 | 首都钢铁公司 | Probe for neutron water measuting instrument |
| CN103163167A (en) * | 2011-12-15 | 2013-06-19 | 中国核动力研究设计院 | Neutron moisture gauge detector |
| RU2624144C1 (en) * | 2016-05-11 | 2017-06-30 | Публичное акционерное общество "Газпром" | Integrated equipment for survey of oil and gas wells and method of recording obtained data |
| CN206892002U (en) * | 2017-05-12 | 2018-01-16 | 肖婉琪 | A kind of concrete device for detecting water content |
| CN108152310A (en) * | 2017-11-19 | 2018-06-12 | 中山大学 | A kind of type neutron source shielding body for neutron activation experiment |
| CN108693201A (en) * | 2018-03-27 | 2018-10-23 | 深圳市中核共创科技有限公司 | A kind of measuring instrument of concrete void detection |
| CN108918565A (en) * | 2018-05-11 | 2018-11-30 | 南京航空航天大学 | A kind of sample Elemental redistribution measuring device and method based on prompt gamma ray neutron activation analysis technique |
| CN109507743A (en) * | 2018-12-04 | 2019-03-22 | 南京航空航天大学 | A kind of high-precision scanning detecting a mine device and scanning detection method |
| CN109884096A (en) * | 2019-04-11 | 2019-06-14 | 北京中百源国际科技创新研究有限公司 | A kind of neutron detection device of high security |
Non-Patent Citations (3)
| Title |
|---|
| WU HONG-LIANG 等: ""Standard spectrum measurement and simulation of elemental capture spectroscopy log"", 《APPLIED GEOPHYSIC》 * |
| 张宇 等: ""D-T 快中子治疗准直屏蔽体设计及中子特性模拟"", 《核技术》 * |
| 段绍节编著: "《中子学宏观实验》", 31 May 2008 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110320224B (en) | 2021-10-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7312460B2 (en) | High energy gamma probe with position sensing capability | |
| JP5797265B2 (en) | Neutron activation analysis to measure neutron flux using a standard sample vessel | |
| CN104330815B (en) | Air kerma conventional true value assay method | |
| CN107991328B (en) | Method, device and system for measuring void information | |
| Tupasela et al. | Passive neutron albedo reactivity measurements of spent nuclear fuel | |
| JP5700692B2 (en) | Method and apparatus for measuring radioactivity concentration in livestock | |
| CN110320224A (en) | Concrete failure detector and defectoscope | |
| Kubinski et al. | Calorimetric non-destructive assay of large volume and heterogeneous radioactive waste drums | |
| Jacobsson et al. | Outcomes of the JNT 1955 phase I viability study of gamma emission tomography for spent fuel verification | |
| Solans et al. | Spent Nuclear Fuel passive gamma analysis and reproducibility: Application to SKB-50 assemblies | |
| JPH09264984A (en) | Out-of-core instrumentation apparatus and method therefor | |
| Levi et al. | Nondestructive measurements of residual 235U mass of Israeli Research Reactor-1 fuel using the Advanced Experimental Fuel Counter | |
| JP2017142126A (en) | Thickness specifying method of lower part of reactor pressure vessel | |
| KR101221291B1 (en) | Differential density measuring device using radiation and collimator for an asphalt pavement and method thereof | |
| CN209400709U (en) | A kind of wolfram steel screening arrangement of passive probe | |
| El Abd et al. | A method for measuring macroscopic cross-sections for thermal neutrons | |
| Heimbach | NIST calibration of a neutron spectrometer ROSPEC | |
| JP2018179537A (en) | Radiation measurement instrument and radiation measurement method | |
| Archambault et al. | A fully-automated, liquid-moderated neutron spectrometer system | |
| RU2811570C1 (en) | Method for determining parameters of volumetric distribution of nuclear fuel in stack of stopped uranium-graphite reactor | |
| Pe´ rot et al. | Experimental qualification with a scale one mock-up of the “measurement and sorting unit” for bituminized waste drums | |
| White et al. | Applications of x-ray fluorescence and fission product correlations for nuclear forensics | |
| Lousteau | Determining 235U Enrichment Using a Dual-Energy Approach for Delayed Neutron Measurements | |
| Tattam et al. | Radiometric non-destructive assay. | |
| JP2018044874A (en) | Radiation measuring instrument and radiation measuring method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |