CN101210897B - X, gamma ray beam detection device for large container - Google Patents
X, gamma ray beam detection device for large container Download PDFInfo
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- CN101210897B CN101210897B CN2006101715755A CN200610171575A CN101210897B CN 101210897 B CN101210897 B CN 101210897B CN 2006101715755 A CN2006101715755 A CN 2006101715755A CN 200610171575 A CN200610171575 A CN 200610171575A CN 101210897 B CN101210897 B CN 101210897B
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- ray beam
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- runing rest
- gamma ray
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Abstract
The invention relates to a detection device, specifically to a detection device for measuring beam center position of X-ray and y-ray used in a large-scaled container detection system. The detection device comprises a detector module, a detector pen holder, a fixed bracket, a rotary bracket, a shaft and a shaft sleeve, wherein, the shaft sleeve is fixed on the fixed bracket, the shaft is fixed on the rotary bracket, the rotary bracket is mated and closely connected with the shaft sleeve on the fixed bracket through the shaft, and the fixed bracket is fixed on the detector pen holder. The invention can accurately and rapidly measure the beam center position of the X-ray and the Y-ray, and has the advantages of simple structure, conveniently assembly and disassembly, easy operation, capability of operation at any time, and no limitations to time, place, weather and other factors.
Description
Technical field
The present invention and a kind of pick-up unit, particularly a kind of χ, gamma ray beam detection device that is used for large container inspection system.
Background technology
In van container χ, gamma-rays checkout facility, form χ, gamma-rays emission and detection system by X ray line or γ source, collimating apparatus, detector three.In the checkout facility debug process, need carry out the measurement and the adjustment of sight alignment to this system, exactly the center line of χ, gamma ray beam, collimating slit and detector is adjusted on the same plane.In the prior art, adopt optics (transit) to measure the method for sight alignment usually, the method can only detect the sight alignment on the optical significance, can't directly determine the invisible χ of naked eyes, gamma ray beam practical center.In order fully to obtain the optimum signal-noise ratio of system, improve every technical indicator of system, guarantee the performance of product, need a device, can accurately measure χ, gamma-ray beam center position.
Summary of the invention
(1) technical matters that will solve
The purpose of this invention is to provide a kind of simple in structure, be convenient to operate, can measure the χ that is used for large container inspection system, the gamma ray beam detection device of the position of ray beam center quickly and accurately.
The purpose of this invention is to provide a kind of simple in structure, be convenient to operate, can measure the χ that is used for large container inspection system, the gamma ray beam detection device of the position of ray beam center quickly and accurately.
(2) technical scheme
In order to achieve the above object, the present invention takes following scheme:
A kind of χ, gamma ray beam detection device that is used for large container inspection system of the present invention, comprise detector module, detector penholder, also comprise fixed support, runing rest, axle, axle sleeve, wherein, described detector module is fixed on the described runing rest, and axle sleeve is fixed on the fixed support, and axle is fixed on the runing rest, described runing rest is closely connected by the axle sleeve on axle and the fixed support, and described fixed support is fixed on the detector penholder.
Wherein, installation bottom surface (7) coplane on the bottom surface of detector module (6) and the detector penholder.
Wherein, runing rest is provided with the scale indication that turns clockwise and be rotated counterclockwise around axle.
Wherein, the geometric center of the detector lines array on the rotation center of runing rest and the detector module overlaps.
Wherein, described axle sleeve is connected on the fixed support, and its center line is arranged on the center line of detector module detector array, and the center line of described axle is arranged on the center line of detector module detector array.
Wherein, the angle of runing rest rotation will make rotation back detector array be listed in perpendicular to the width of the width on the ray line covering of the fan direction greater than ray line covering of the fan.
(3) beneficial effect
1) the present invention is by being installed in the detector module and support bracket fastened relative rotation on the runing rest, the position that can measure the ray beam center quickly and accurately; 2) the present invention is simple in structure, is convenient to dismounting, is convenient to operation; 3) the present invention can carry out work at any time, not limited by various factorss such as time, place, weather.
Description of drawings
Fig. 1 is the overall construction drawing that is used to detect χ, gamma ray beam of the present invention;
Fig. 2 is the position view of detector module of the present invention when not rotating;
Fig. 3 is the present invention's position view of each detector pen in the detector module when rotating an angle;
Fig. 4 is the structural representation of χ of the present invention, gamma ray beam detection device;
Fig. 5 is the vertical view of Fig. 4.
Among the figure: 1. detector module; 2. runing rest; 3. the datum line corresponding with the detector array geometric center lines; The axle; 5. fixed support; 6. runing rest is used for fixing the plane of detector module; 7. support bracket fastened bottom surface; 8. accelerator or radioactive source target spot; 9. collimating apparatus; 10 ray line covering of the fans; 11. detector penholder; 12. χ, gamma ray beam detection device; 13. detector pen; 14. the center line of the ray line covering of the fan under the ideal conditions; Length between the L detector pen; θ. χ, the gamma ray beam detection device anglec of rotation.
Embodiment
Following examples are used to illustrate the present invention, but are not used for limiting protection scope of the present invention.
As Fig. 1, Fig. 3, shown in Figure 4, during the invention process, on the basis of accelerator or radioactive source target spot 8, collimating apparatus 9, detector, χ, gamma ray beam detection device have been installed additional.This device is made up of two parts, and wherein, first is a fixed support 5, and it is fixing custom-designed at detector module 1 installation dimension.Direct image is installed detector module 1 equally when reality is used, and replaces this locational detector module 1 to be fixed on the detector penholder 11.Be parallel to the bottom surface on the fixed support 5 and connect an axle sleeve, the center line of this axle sleeve is arranged on the center line of detector module 1 detector array.
Second portion is a runing rest 2, and an axle 4 is installed on the runing rest 2, and this 4 center line is parallel to the plane of fixed detector module 1 above it, and this center line of 4 is arranged on the center line of detector module 1 detector array.The installation bottom surface that a detector module 1 is arranged on this runing rest 2, when not rotating, in fact the installation bottom surface of this detector module 1 is exactly the face that stretches out of detector module 1 installation bottom surface on the former detector penholder 11.
First and second portion are to come close-fittingly by axle 4 and axle sleeve, and second portion can be around axle 4 rotations, clockwise or be rotated counterclockwise the scale indication is all arranged.
When accelerator goes out to restraint, at first under non-rotary state, proofread and correct the inconsistency between each detector in this detector module 1, by clockwise or be rotated counterclockwise 1 one angles of detector module, this detector array is listed in perpendicular to the width on the ray line covering of the fan direction gets final product again greater than the beam width of actual ray or the width range of being concerned about.Requirement can be measured peak shape curve in this width range, otherwise should increase this width range.Can realize by the number that increases the anglec of rotation or increase same detector.
The measured value (being the P value) that records this detector array distributes, and its maximal value is corresponding with the peak value of actual beam center, error less than single detector sensitivity size on perpendicular to ray line covering of the fan direction about half of projection.If the peak value of the measured distribution that obtains overlaps with the position of rotation center, illustrate that then the geometric center of design on the beam center of ray and the detector penholder 11 meets, at this moment system may obtain best signal to noise ratio (S/N ratio); Otherwise the two existence departs from, if gap is bigger, should give adjustment; Direction that departs from and size all can relatively be obtained by the position of measured peak correspondence and the position of rotation center.
When the present invention uses, remove favorably situated detector module 1 on perpendicular (horizontal stroke) arm of scanning car earlier, by the bottom outlet on the fixed mount 5, this device is fixed on the position of former detector module 1 with screw again.Afterwards the detector module 1 that removes is fixed on the runing rest 2, connects power supply, the signal wire of detector module 1 then.When scanning car accelerator or radioactive source 8 go out to restraint, detect the distribution situation of measurement (P) value of detection array on this module (pen), be used for difference between the tuning detector array.Then by moving runing rest 2 with being rotated counterclockwise clockwise, change the angle of detector module, detect the distribution situation of measurement (P) value of detection array on this module (pen) once more, by simple data processing, just can calculate χ, displacement that the gamma ray beam center is amesiality exactly, reach the position of arm anyhow by χ head (source positions), the collimating apparatus 9 of adjusting accelerator or radioactive source 8 then, adjust sight alignment, can guarantee that χ, gamma ray beam are centered close on the center line of detector module 1.
Calculation of displacement method about χ, gamma ray beam misalignment desired center is as follows:
(1) because in each detector module 1 (being detector array or detector pen) several independently circuit and detector pens 13 is arranged, it can measure the intensity of ray on its position and the cross section, because each detector performance and sensitivity etc. all have gap, therefore the data of measuring itself just there are differences, in order to reduce error, can be when rotary detector module 1 not, be the detector array column direction be installed in jib on detector array column direction when consistent, difference to 13 in each detector pen is proofreaied and correct (normalizing), calculate the correction factor of each, promptly each correction factor makes the mean value of each normalizing to this detector array.
(2) as shown in Figure 3, behind angle θ of ray beam center pick-up unit rotation, each detector pen 13 can calculated with simple trigonometric function perpendicular to the position projection of ray line covering of the fan direction.Suppose the geometric center (can by machining guarantee) of rotation center at detector array, certain detector center (i props up the detector pen) is Δ Li (can measure) apart from the distance of this rotation center, then these detector pen 13 centre distance rotation centers vertical (or level) distance is: Δ Li * Sin (θ) so just can calculate each detector pen 13 center and retrodeviate vertical (or level) distance from rotation center rotating the θ angle.
(3) distance of top each detector pen 13 is done horizontal ordinate, the resulting value of correction factor that the transmitted intensity numerical value that corresponding detector pen 13 positions are measured multiply by this is done ordinate, can make the emergent beam intensity of flow in that () distribution plan or in the horizontal direction, the pairing position of its peak value is exactly the position of beam intensity maximum perpendicular to former detector array column direction.Can know the degree of actual ray line misalignment desired center in view of the above.
The angle of described runing rest 2 rotations will make rotation back detector array be listed in perpendicular to the width on the ray line covering of the fan direction greater than the width of ray line covering of the fan or the width of being concerned about, its objective is in order to guarantee that rotary detector module 1 measured scope can cover the width of ray line covering of the fan or the width of being concerned about, thereby guarantee the validity of measurement data.
Described scale indication is engraved in the surface of fixed support 5 or runing rest 2.
In addition, when on the detector high pressure being arranged, need install a pair of insulated handle additional.At this moment, when changing angle of the present invention at every turn, hold as far as possible be installed in runing rest 2 insulated handle, rotate gently, health is the metal part and the detector module 1 of contact device not.
Claims (6)
1. χ who is used for large container inspection system, gamma ray beam center pick-up unit, comprise detector module (1), detector penholder (11), it is characterized in that: also comprise fixed support (5), runing rest (2), axle (4), axle sleeve, wherein, described detector module (1) is fixed on the described runing rest (2), axle sleeve is fixed on the fixed support (5), axle (4) is fixed on the runing rest (2), described runing rest (2) is closely connected by the axle sleeve on axle (4) and the fixed support (5), and described fixed support (5) is fixed on the detector penholder (11).
2. a kind of χ, gamma ray beam center pick-up unit that is used for large container inspection system as claimed in claim 1 is characterized in that: the installation bottom surface coplane on the bottom surface of detector module (1) and the detector penholder (11).
3. a kind of χ, gamma ray beam center pick-up unit that is used for large container inspection system as claimed in claim 1 is characterized in that: runing rest (2) is provided with the scale indication that turns clockwise and be rotated counterclockwise around axle.
4. a kind of χ, gamma ray beam center pick-up unit that is used for large container inspection system as claimed in claim 1 is characterized in that: the geometric center of the detector lines array on the rotation center of runing rest (2) and the detector module (1) overlaps.
5. a kind of χ, gamma ray beam center pick-up unit that is used for large container inspection system as claimed in claim 1, it is characterized in that: described axle sleeve is connected on the fixed support (5), its center line is arranged on the center line of detector module (1) detector array, and the center line of described axle (4) is arranged on the center line of detector module (1) detector array.
6. as arbitrary described a kind of χ, gamma ray beam center pick-up unit that is used for large container inspection system of claim 1-5, it is characterized in that: the angle of runing rest (2) rotation will make rotation back detector array be listed in perpendicular to the width of the width on the ray line covering of the fan direction greater than ray line covering of the fan.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101715755A CN101210897B (en) | 2006-12-30 | 2006-12-30 | X, gamma ray beam detection device for large container |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101715755A CN101210897B (en) | 2006-12-30 | 2006-12-30 | X, gamma ray beam detection device for large container |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101210897A CN101210897A (en) | 2008-07-02 |
| CN101210897B true CN101210897B (en) | 2011-10-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2006101715755A Active CN101210897B (en) | 2006-12-30 | 2006-12-30 | X, gamma ray beam detection device for large container |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113514868B (en) * | 2021-04-13 | 2022-05-17 | 中国科学院近代物理研究所 | Electrode assembly and detector for measuring beam position of high current accelerator |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3934138A (en) * | 1973-03-30 | 1976-01-20 | Compagnie General De Radiologie | Apparatus for measuring surface stress by X-ray diffraction |
| US4468119A (en) * | 1982-05-24 | 1984-08-28 | Hamar M R | Penta-prism module having laser alignment error detection and correction capability |
| CN2077121U (en) * | 1990-10-25 | 1991-05-15 | 大同铁路分局大同车辆段 | Detecting point prover of infrared search unit |
| US5218626A (en) * | 1992-05-01 | 1993-06-08 | Picker International, Inc. | Solid state photo sensor with adjustable viewing means |
| CN200993644Y (en) * | 2006-12-30 | 2007-12-19 | 清华同方威视技术股份有限公司 | X-gamma ray beam detecting device for large-sized containers |
-
2006
- 2006-12-30 CN CN2006101715755A patent/CN101210897B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3934138A (en) * | 1973-03-30 | 1976-01-20 | Compagnie General De Radiologie | Apparatus for measuring surface stress by X-ray diffraction |
| US4468119A (en) * | 1982-05-24 | 1984-08-28 | Hamar M R | Penta-prism module having laser alignment error detection and correction capability |
| CN2077121U (en) * | 1990-10-25 | 1991-05-15 | 大同铁路分局大同车辆段 | Detecting point prover of infrared search unit |
| US5218626A (en) * | 1992-05-01 | 1993-06-08 | Picker International, Inc. | Solid state photo sensor with adjustable viewing means |
| CN200993644Y (en) * | 2006-12-30 | 2007-12-19 | 清华同方威视技术股份有限公司 | X-gamma ray beam detecting device for large-sized containers |
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| CN101210897A (en) | 2008-07-02 |
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