CN103364818B - Source, radioactivity face automatic imitation scale gas source detection efficient device and method - Google Patents
Source, radioactivity face automatic imitation scale gas source detection efficient device and method Download PDFInfo
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- CN103364818B CN103364818B CN201310294436.1A CN201310294436A CN103364818B CN 103364818 B CN103364818 B CN 103364818B CN 201310294436 A CN201310294436 A CN 201310294436A CN 103364818 B CN103364818 B CN 103364818B
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Abstract
Source, one radioactivity face of the present invention automatic imitation scale gas source detection device, including radioactive source pallet, support column, sleeve pipe, base, leakage hole, source, face, CZT detector; Hollow out in the middle of radioactive source pallet, its bottom surface is connected with at least two support column; Hollow out in the middle of base, its upper bottom surface is connected with at least two sleeve pipe; Support column is consistent with sleeve pipe quantity and position one_to_one corresponding, and the overall diameter of described support column is accurately equal with the interior diameter of sleeve pipe. The present invention is not by other external strengths, and be that the gravity simply utilizing radioactive source pallet, support column self is as power source, the face of completing is derived from dynamic scale gas source, make use of support column and the closing space of sleeve pipe composition, arrange a leakage hole to be exhausted in this space, this leakage hole is arranged on base simultaneously, eliminates the impact that pallet and support column are declined by leakage hole.
Description
Technical field
The present invention relates to the detection efficiency calibration technology of gas source in Application of Nuclear Technology field. It is specifically related to measure source, the face graduation apparatus of the radgas source detection efficiency that object is gas source.
Background technology
Radiometry is that various radioactive sample sources are detected and are analyzed. Wherein efficiency calibration and analysis process are one important steps, only accurately and reliably carry out efficiency calibration, just can obtain effective activity concentration of sample. Want the gaseous sample of probing column shape, the Standard Gases body source identical with sample size need to be made, by this Standard Gases body source, detector is detected efficiency calibration, then gaseous sample measurement could be analyzed. When the shape of sample differs with standard source, make, buy, transport standard source time and effort consuming, greatly reduce work efficiency.
For the problems referred to above, main employing LabSOCS software or illiteracy card simulation both at home and abroad calculates the passive scale realizing gas source, save by the process of Standard Gases body source scale, improve work efficiency, but cover card simulation and must be known by the sensitive volume within detector crystal, this sensitive volume generally hardly results in, and therefore there is bigger error. On the other hand, use source, face scale technology, source, face is tested at distance crystal differing heights, it is determined that peak, source, face counting rate is with the variation relation f of heightsH (), integration obtains gas source detection efficient, and the method to some extent solves gas source scale problem, but experimentation is complex, it is necessary to has artificially manually removed scale, has been not easy to popularization and application. Number of patent application be the gamma ray spectrometer sample holder of 201020218895.3, its goal of the invention and principle and the present invention entirely different, its basic structure is upper and lower annulus, middle is made up of support bar and sleeve pipe, and sample is measured and highly controlled by pad washer.It has been primarily used to the measurement of static body source sample, it is impossible to make radioactive source be in a dynamic movement process.
Summary of the invention
It is an object of the present invention to provide a kind of source, radioactivity face automatic imitation scale gas source detection efficient device, which solve that existing passive scale exists bigger error, source, face scale can only for completing the technical problem of the measurement of static body source sample.
The technical solution of the present invention is:
A kind of source, radioactivity face automatic imitation scale gas source detection device, it is characterized in that
Including radioactive source pallet 1, support column 2, sleeve pipe 3, base 4, leakage hole 5, source, face 8, CZT detector 9;
The described middle hollow out of radioactive source pallet 1, its bottom surface is connected with at least two support column 2;
The described middle hollow out of base 4, its upper bottom surface is connected with at least two sleeve pipe 3;
Described support column 2 is consistent with sleeve pipe 3 quantity and position one_to_one corresponding, and the overall diameter of described support column 2 is accurately equal with the interior diameter of sleeve pipe 3;
The bottom center of described sleeve pipe 3 is provided with leakage hole 5; Described leakage hole 5 communicates with outside air;
Described source 8 is placed on radioactive source pallet 1 centre position, and the coating diameter in described source 8 is less than radioactive source pallet 1 hollow out diameter, and the end liner diameter in described source 8 is more than hollow out diameter;
Described CZT detector 9 is placed on the center of base 4, and described CZT detector 9 bottom surface catercorner length need to less than base 4 hollow out diameter.
Also include the support column packing ring 7 of the middle hollow out being placed in sleeve pipe 3.
Also include at least three packing ring 6 being arranged on below base 4.
Above-mentioned radioactive source pallet 1, support column 2, sleeve pipe 3, base 4, packing ring 6, support column packing ring 7 material be rustless steel, the substrate in described source 8 is aluminum.
Source, the radioactivity face automatic imitation scale gas source detection method of said system, it is characterised in that: comprise the following steps:
1] fall off rate as requested sets the size of leakage hole 5;
2] source, face 8 is placed on radioactive source pallet 1 centre position, CZT detector 9 is placed on the center of base 4;
3] all support columns 2 are put in corresponding sleeve pipe 3;
4] face to face source uniform descent time start timing, total peak counting that detector test surface source produces;
5] detection efficient of gas source is calculated:
In formula:
N is total peak counting that source, face produces in whole motor process in crystal;
A is face source radiation activity (Bq);
PγFor gamma-rays emission probability;
T is source fall time, face (s).
Above-mentioned steps 3 also includes the step of the height of chain of command source Simulated gas body source, and it adopts the support column packing ring 7 putting into differing heights in sleeve pipe 3 to regulate the mode that support column 2 gos deep into the degree of depth of sleeve pipe 3.
The advantage of patent of the present invention is:
1, the present invention utilizes source, face to solve the daily efficiency calibration problem of gas source, is greatly saved the cost of manufacture of radioactive standard gas source.
2, due to the fact that and employ CZT detector, can being operated in room temperature state, decrease refrigeration plant, whole system is miniaturization more.
3, the present invention is not by other external strengths, and simply simply utilizes the gravity of radioactive source pallet 1, support column 2 self as power source, and the face of completing is derived from dynamic scale gas source.
4, the ingenious closing space that make use of support column 2 and sleeve pipe 3 composition of the present invention, arranges a leakage hole 5 and is exhausted in this space, and this leakage hole 5 is arranged on base 4 simultaneously, eliminates the impact that pallet 1 and support column 2 are declined by leakage hole 5.
5, present invention employs support column packing ring 7 and put into the design of sleeve pipe 3, thus controlling support column 2 to go deep into the degree of depth of sleeve pipe 3, making the height adjustable in radioactive source pallet 1 dough-making powder source, finally make it can simulate the gas source efficiency of differing heights.
Accompanying drawing explanation
Fig. 1 is face source structure schematic diagram;
Fig. 2 is radioactive source pallet 1 and support column 2 structural representation;
Fig. 3 is sleeve pipe 3 and base 4 structural representation;
Fig. 4 is packing ring 6 and support column packing ring 7 structural representation;
Fig. 5 is source, face automatic imitation scale gas source detection efficient apparatus structure schematic diagram;
Fig. 6 is CZT crystal structure schematic diagram;
Accompanying drawing labelling: 1-radioactive source pallet; 2-support column; 3-sleeve pipe; 4-base; 5-leakage hole; 6-packing ring; 7-support column packing ring; Source, 8-face end liner; Source, 9-face coating; 10-electrolyte; 11-anode; 12-negative electrode; 13-conductor shield; W-width; H-thickness.
Detailed description of the invention
A kind of source, radioactivity face automatic imitation scale gas source detection efficient method and device, including radioactive source pallet 1, support column 2, sleeve pipe 3, base 4, leakage hole 5, packing ring 6, support column packing ring 7, source, face 8, CZT detector 9.
Radioactive source pallet 1 is positioned on base 4 and is connected by sleeve pipe 3 and support column 2, base supports with three mutually level packing rings 6, the center position that leakage hole 5 is positioned on base two sleeve pipes, paired support column packing ring 7 can put into sleeve pipe 3, source, face 8 is placed on radioactive source pallet 1 centre position, and CZT detector 9 is placed on the center of base 4.
Radioactive source pallet 1, support column 2, sleeve pipe 3, base 4, packing ring 6, support column packing ring 7 are same metal (rustless steel), and source, face 8 end liner is aluminum.
The overall diameter of support column 2 is accurately equal with the interior diameter of sleeve pipe 3, and the overall diameter of support column packing ring 7 is equal with the interior diameter of sleeve pipe 3.
Radioactive source pallet 1 is connected with support column 2, and base 4 is connected with sleeve pipe 3, radioactive source pallet 1 and the middle hollow out of base 4.
Leakage hole 5 must be positioned on base 4, and at the center position of two sleeve pipes, to ensure that there is the place of gas leakage in the space of closing that support column 2 and sleeve pipe 3 form; The decrease speed of radioactive source pallet 1 is relevant with leakage hole 5 size, and the little then decrease speed in aperture is slow, and greatly then decrease speed is fast in aperture.
Connecting three mutually level packing rings 6 below base, the effect of packing ring makes whole frame bottom make somebody a mere figurehead, it is ensured that leakage hole 5 can normal exhaust.
Face to face when source 8, radioactive source pallet 1 and support column 2 uniform descent height H in time, the space that it is inswept is equivalent to a gas source, it is achieved thereby that source, face automatic imitation scale gas source detection efficient.
Support column packing ring 7 must be the set pipeloop of middle hollow out, and middle hollow out ensure that gas can be discharged from leakage hole 5.
The support column packing ring 7 of paired differing heights can put into two sleeve pipes 3, and the effect of support column packing ring 7 is to regulate support column 2 to go deep into the degree of depth of sleeve pipe 3, thus have adjusted the maximum height that radioactive source pallet 1 declines, namely controls the height of source, face Simulated gas body source.
The appear formula of detection efficient of gas source of source simulation of deriving is:
In formula:
N is total peak counting that source, face produces in whole motor process in crystal;
A is face source radiation activity (Bq);
PγFor gamma-rays emission probability;
T is source fall time, face (s).
This formula reach a conclusion be total peak counting of only being produced by source, face of the gas source detection efficient of simulation and fall time the two key parameter determine.
Source, face 8 coating diameter need to less than radioactive source pallet 1 hollow out diameter, and end liner diameter need to more than hollow out diameter, and CZT detector 9 ground catercorner length need to less than base 4 hollow out diameter.
CZT detector 9 is used for the spectral measurement of radgas, is mainly used in Nuclear-Test-Ban Verification nucleic131mXe,133Xe,133mXe,135Xe spectral measurement.
Detector crystal dimension plan required for this patent: size per sample, its internal diameter is 42mm, and therefore CZT crystal length and width W can be designed as 40.0mm, and crystal can not be too little, and too little then detection efficient is too low. The ray energy of below the 700keV that this patent is paid close attention to, therefore crystal thickness can be reduced, namely the thickness H of crystal is 10.0mm, crystal is more thin, the detection of low energy ray is affected more little by the Compton platform of high-energy ray, the energy resolution of low energy ray and detection efficient are also more good, and carbon window thickness is 0.50mm.
A kind of source, radioactivity face automatic imitation scale gas source detection efficient device, its making is divided into following step:
1, according to preliminary dimension, materials processing become radioactive source pallet 1, support column 2, sleeve pipe 3, base 4, packing ring 6, support column packing ring 7; Electroplating surface source 8, makes CZT detector 9.
2, two support columns 2 are connected to radioactive source pallet 1 to specify on position.
3, on base 4, specified location bores two leakage holes 5 of certain pore size size. Pore size is determined as required, and aperture greatly then radioactive source pallet 1 decrease speed is fast, and aperture little then radioactive source pallet 1 decrease speed is then slow.
4, two sleeve pipes 3 are connected to base 4 and specify on position, it is ensured that two leakage holes 5 are positioned at two sleeve pipe 3 centers. To facilitate the confined space of sleeve pipe 3 and support column 2 and base 4 composition to have a leakage hole 5 in gas leakage, thus ensure that radioactive source pallet 1 can uniform descent.
5, the packing ring 6 that three highly identical is connected to below base 4 on equally distributed three positions.
6, electroplating surface source 8 being placed on radioactive source pallet 1 center, CZT detector 9 is placed in the center of base 4 hollow out, completes the assembling of whole graduation apparatus.
Principles of the invention is:
Face to face during the uniform descent height H in time of source, the space that it is inswept is suitable is the gas source of H with a height. Its gas source detection efficient formula proving is as follows:
Face source detection efficiency is generally by peak counting rate fsH () determines, fsH () is again the function with h change. Then gas source detection efficient is represented by again formula (1).
A represents face source radiation activity (Bq), PγRepresent gamma-rays emission probability, wherein fsH () obtains, from 0～H integration, total peak counting rate that decline process in source, face produces in crystal, then represent peak, source, the face counting rate meansigma methods with height change divided by H, and it doesn't matter with the time of measurement. Source, face is in whole motor process simultaneously, and the total peak produced in crystal is counted as N, source, face t fall time, is also the measurement time. Then source, face is represented by again N/t in the meansigma methods of the peak counting rate of 0～H distance generation, that is:
By the detection efficient computing formula that formula (2) substitutes into formula (1) then gas source it is:
Can be seen that total peak counting that the gas source detection efficient of simulation is only produced by source, face determined with fall time from formula (3). This technical method must be strict with face source diameter and cylindrical gas source diameter, the concordance of simulated altitude and gas source height, and analog result just can be made accurately reliable.
Namely the present invention, in order to obtain source, face uniform descent, applies the newtonian motion theorem of mechanics: when object is by equilibrant effect, object will remain a constant speed kinestate.The present invention is ingenious forms a confining gas space sealed by sleeve pipe and support column, if when leakage hole, the self gravitation of radioactive source pallet and support column will keep balance with gas to the pressure of support column, and when there being leakage hole to exist, the gas compartment is reduced by support column compression gradually due to gas leakage, whole system gravity is equal all the time with gas pressure in this process, then radioactive source pallet and support column are by uniform descent, it is achieved thereby that source, face uniform descent Simulated gas body source. When the gas of simulation cannot make source, face, the source, face that substitution method makes other nucleic can be used to carry out substituting scale, for instance133Xe (81keV) gas, it is contemplated that close with emitted energy170Tm(84.25keV),133The sources, face such as Ba (81keV) substitute.
Therefore, patent of the present invention propose face to face source uniform descent height H in time time, the space that it is inswept is quite the gas source of H with a height, thus by the efficiency of source, the face derivation scale gas source of dynamic motion. Its relative patent application number be 201020218895.3 gamma ray spectrometer sample holder mainly have three innovative points: one is sleeve pipe interior diameter, and require upper with the design of support column diameter dimension must be consistent, it is thus possible to form confined space; Two is have leakage hole to design; Three is that support bottom annulus connects packing ring, it is ensured that leakage hole energy normal exhaust, it is achieved that source, face uniform descent, namely finished surface is derived from dynamic scale gas source efficiency. Apply this Calibration principle method, can study a kind of simple, quick, automatically, extremely strong source, the face scale gas source device of practicality.
Below in conjunction with drawings and Examples, the present invention is further described.
1, according to preliminary dimension, stainless steel material is processed into a radioactive source pallet (external diameter 150mm, thickness 5.0mm, internal diameter 75mm), two support column (diameter 15mm, height 150mm), two sleeve pipes (internal diameter 15mm, height 150mm, external diameter 17mm), base (external diameter 150mm, thickness 3.0mm, internal diameter 75mm), some paired packing rings (internal diameter 13mm, height 2～10mm, external diameter 15mm); Source, face end liner diameter 90mm, uses aluminium material, and radionuclide electrodeposited coating diameter is 42mm; CZT crystalline size is 40mm × 40mm × 10mm.
2, first base being bored two leakage holes, two leakage hole centre distance base outward flange 10mm, and be distributed on base diameter, pore size is about 1.0～3.0mm, and two pore sizes need to keep certain concordance.
3, telescopic joint in base upper surface by two, make alignment leakage hole center, sleeve pipe axis.
3,2 support columns being connected to radioactive source pallet precalculated position: support column centre distance radioactive source tray edge 10mm, 2 support columns must in radioactive source pallet diametrical position.
4, being connected to below base by 3 packing rings that height is 5.0mm, 3 packing rings are uniformly distributed, and each packing ring distance base outward flange is 10mm, and whole device Design and Machining completes.
Dimensions above is determined according to newly-designed CZT detector, if other types detector can adjust as the case may be.
Claims (6)
1. source, radioactivity face automatic imitation scale gas source detection device, it is characterised in that: include radioactive source pallet (1), support column (2), sleeve pipe (3), base (4), leakage hole (5), source, face (8), CZT detector (9);
Hollow out in the middle of described radioactive source pallet (1), its bottom surface is connected with at least two support column (2);
Hollow out in the middle of described base (4), its upper bottom surface is connected with at least two sleeve pipe (3);
Described support column (2) is consistent with sleeve pipe (3) quantity and position one_to_one corresponding, and the overall diameter of described support column (2) is accurately equal with the interior diameter of sleeve pipe (3);
The bottom center of described sleeve pipe (3) is provided with leakage hole (5); Described leakage hole (5) communicates with outside air;
Described source (8) is placed on radioactive source pallet (1) centre position, the coating diameter of described source (8) is less than radioactive source pallet (1) hollow out diameter, and the end liner diameter of described source (8) is more than hollow out diameter;
Described CZT detector (9) is placed on the center of base (4), and described CZT detector (9) bottom surface catercorner length need to less than base (4) hollow out diameter.
2. source, radioactivity face according to claim 1 automatic imitation scale gas source detection device, it is characterised in that: also include the support column packing ring (7) of the middle hollow out being placed in sleeve pipe (3).
3. source, radioactivity face according to claim 2 automatic imitation scale gas source detection device, it is characterised in that: also include at least three packing ring (6) being arranged on base (4) lower section.
4. source, radioactivity face according to claim 3 automatic imitation scale gas source detection device, it is characterized in that: described radioactive source pallet (1), support column (2), sleeve pipe (3), base (4), packing ring (6), support column packing ring (7) material be rustless steel, the substrate of described source (8) is aluminum.
5. based on source, the radioactivity face automatic imitation scale gas source detection method of device described in claim 1 or 2 or 3 or 4, it is characterised in that: comprise the following steps:
1] fall off rate as requested sets the size of leakage hole (5);
2] Jiang Mianyuan (8) is placed on radioactive source pallet (1) centre position, and CZT detector (9) is placed on the center of base (4);
3] all support columns (2) are put in corresponding sleeve pipe (3);
4] face to face source uniform descent time start timing, total peak counting that detector test surface source produces;
5] detection efficient of gas source is calculated:
In formula:
N is total peak counting that source, face produces in whole motor process in crystal;
A is face source radiation activity (Bq);
P γ is gamma-rays emission probability;
T is source fall time, face (s).
6. source, radioactivity face automatic imitation scale gas source detection method according to claim 5, it is characterized in that: described step 3 also includes the step of the height of chain of command source Simulated gas body source, it adopts the support column packing ring (7) putting into differing heights in sleeve pipe (3) to regulate the mode that support column (2) gos deep into the degree of depth of sleeve pipe (3).
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103592670B (en) * | 2013-11-07 | 2016-06-01 | 西北核技术研究所 | Gamma radioactive gas body source Absolute detection efficiency graduation apparatus and method |
| CN104020483B (en) * | 2014-06-13 | 2016-06-22 | 西北核技术研究所 | Adopt method and the device of virtual source analog scaling detector detection efficient |
| CN109085639B (en) * | 2018-08-20 | 2020-08-21 | 中国原子能科学研究院 | A kind of133Preparation of Xe simulation gas source and detection efficiency correction method |
| CN109669204B (en) | 2019-01-08 | 2019-09-06 | 山西医科大学 | A kind of CZT semiconductor activity meter and activity measurement device |
| CN114371494B (en) * | 2022-03-22 | 2022-06-24 | 西南科技大学 | Radioactive source scene simulation method for autonomous sourcing robot |
| CN118011458A (en) * | 2024-02-05 | 2024-05-10 | 安徽望辐药业有限公司 | Radioactive drug activity measuring device and method based on passive efficiency scale |
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