CN104360369A - Method and device for measuring response function of detector - Google Patents
Method and device for measuring response function of detector Download PDFInfo
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- CN104360369A CN104360369A CN201410641929.2A CN201410641929A CN104360369A CN 104360369 A CN104360369 A CN 104360369A CN 201410641929 A CN201410641929 A CN 201410641929A CN 104360369 A CN104360369 A CN 104360369A
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Abstract
The invention discloses a method and device for measuring the response function of a detector. The device for measuring the response function of the detector at least comprises an energy dispersive spectrometer (2), an installation cylinder (3), a transparent silica gel sheet (5) coated with a photocoupling agent, a photomultiplier tube (PMT) assembly (6), a spring (7), an installation cap (8) and a signal line (9), wherein the installation cap (8) is connected with one end of the installation cylinder (3), the signal line (9) is used for connecting the energy dispersive spectrometer (2) with the PMT assembly (6), the other end of the installation cylinder (3) is connected with a shell of the detector (4), the detector (4) is coupled with the PMT assembly (6) through the transparent silica gel sheet (5), one end of the spring (7) is connected with the PMT assembly (6), and the other end of the spring (7) is connected with the installation cap (8). By the adoption of the method and device for measuring the response function of the detector, measurement of the response function of the detector is achieved.
Description
Technical field
The present invention relates to detector field, espespecially a kind of method and apparatus measuring detector response function.
Background technology
At present, domestic Nuclear Logging Tools research and development are not special attention to gamma ray detector response function, and the result that the result causing the Nuclear Logging Tools of batch industrialization finally to record and external instrument record there are differences.Therefore, accurately measure the response function of detector, the response function of bismuth germanium oxide (BGO) detector used by geochemical well logging instrument especially researched and developed is very important.And not yet have correlation technique openly to measure the technical scheme of detector response function at present.
Summary of the invention
In order to solve the problem, the present invention proposes a kind of method and apparatus measuring detector response function, the response function of detector can be measured.
In order to achieve the above object, the present invention proposes a kind of device measuring detector response function, at least comprise:
Energy spectrometer (2), mounting cylinder (3), the transparent silicon film (5) scribbling photoelectric coupling agent, photomultiplier PMT assembly (6), spring (7), the mounting cap (8) be connected with one end of mounting cylinder (3), for being connected the signal wire (9) of energy spectrometer (2) and PMT assembly (6);
Wherein, the other end of mounting cylinder (3) is connected with detector (4) shell, detector (4) is coupled by transparent silicon film (5) and PMT assembly (6), one end of spring (7) is connected with PMT assembly (6), and the other end of spring (7) is connected with mounting cap (8).
Preferably, also comprise: be positioned at the shield (1) between described energy spectrometer (2) and described mounting cylinder (3).
Preferably, the other end of described mounting cylinder (3) is connected by screw with between described detector (4) shell.
Preferably, one end of described mounting cap (8) and described mounting cylinder (3) is threaded connection.
The invention allows for a kind of method measuring detector response function, comprising:
When difference between the density of the naked crystal in the density and detector of transparent silicon film is minimum, measure the counting of detector when not placing radioactive source;
The counting of detector is measured when placing radioactive source;
Change the counting of radioactive source duplicate measurements detector;
According to the counting measuring detector corresponding to each radioactive source of obtaining, and the response function of the counting matching detector of the detector that measurement obtains when not placing radioactive source.
Compared with prior art, the present invention includes: energy spectrometer 2, mounting cylinder 3, the transparent silicon film 5 scribbling photoelectric coupling agent, photomultiplier PMT assembly 6, spring 7, the mounting cap 8 be connected with one end of mounting cylinder 3, for being connected the signal wire 9 of energy spectrometer 2 and PMT assembly 6; Wherein, the other end of mounting cylinder 3 is connected with detector 4 shell, and detector 4 is coupled by transparent silicon film 5 and PMT assembly 6, and one end of spring 7 is connected with PMT assembly 6, and the other end of spring 7 is connected with mounting cap 8.By the solution of the present invention, achieve the measurement of the response function to detector.
Accompanying drawing explanation
Be described the accompanying drawing in the embodiment of the present invention below, the accompanying drawing in embodiment is for a further understanding of the present invention, is used from explanation the present invention, does not form limiting the scope of the invention with instructions one.
Fig. 1 is the structure composition schematic diagram that the present invention measures the device of detector response function;
Fig. 2 is the process flow diagram that the present invention measures the method for detector response function;
In figure, 1 is shield, and 2 is energy spectrometer, and 3 is mounting cylinder, and 4 is detector, and 5 is transparent silicon film, and 6 is PMT assembly, and 7 is spring, and 8 is mounting cap, and 9 is signal wire.
Embodiment
For the ease of the understanding of those skilled in the art, below in conjunction with accompanying drawing, the invention will be further described, can not be used for limiting the scope of the invention.
See Fig. 1, the present invention proposes a kind of device measuring detector response function, at least comprise:
Energy spectrometer 2, mounting cylinder 3, the transparent silicon film 5 scribbling photoelectric coupling agent, photomultiplier (PMT, Photo Multiplier Tube) assembly 6, spring 7, the mounting cap 8 be connected with one end of mounting cylinder 3, for being connected the signal wire 9 of energy spectrometer 2 and PMT assembly 6.
Wherein, the other end of mounting cylinder 3 is connected with detector 4 shell, and detector 4 is coupled by transparent silicon film 5 and PMT assembly 6.
Wherein, the other end of mounting cylinder 3 can be connected by screw with between detector 4 shell.Concrete, four threaded holes can be set at detector 4 shell, mounting cylinder 3 tail end arranges four countersunk screw hole, four threaded holes on detector 4 shell are positioned on four countersunk screw hole of mounting cylinder 3 tail end.
Wherein, the both sides of transparent silicon film 5 are coated with appropriate photoelectric coupling agent.
Wherein, one end of spring 7 is connected with PMT assembly 6, and the other end of spring 7 is connected with mounting cap 8.Particularly, one end of spring 7 is placed on the cylindrical boss of PMT assembly 6 end face, and the other end of spring 7 then withstands in the internal end surface of mounting cap 8.
Wherein, detector is an assembly, wraps up a naked crystal form by a metal shell.Such as, BGO detector wraps up a BGO crystal (naked crystal) by a metal shell and forms, and is provided with one deck buffer layer between BGO and shell.
Wherein, one end of mounting cap 8 and mounting cylinder 3 can be threaded connection, and the length of this threaded engagement is adjustable.
By device of the present invention, achieve the measurement to detector response function.
In device of the present invention, also comprise the shield 1 for screening energy spectrometer 2, shield 1 is between energy spectrometer 2 and mounting cylinder 3.Wherein, shield 1 can be lead brick.
Illustrate how device of the present invention is installed for bismuth germanate detector below.
The first, adopt 137Cs to be gamma-rays radioactive source, and this radioactive source (point source) is embedded in a polyethylene spheres inside, can ensure that radiation field is isotropic like this.
The second, bismuth germanium oxide (BGO) detector 4 is put into mounting cylinder 3, and by four gib screws, detector 4 and mounting cylinder 3 are located.
Three, appropriate photoelectric coupling agent is spread in the painting of transparent silicon film 5 both sides, and be attached to the bottom of PMT assembly 6.
Four, the assembly of PMT assembly 6 with transparent silicon film 5 is pushed in mounting cylinder 3.Rotate six sides bottom mounting cap 8 with spanner, mounting cylinder 3 is just threaded connection into mounting cap 8 and is integrated.And constantly screwing along with screw thread, the spring between mounting cylinder 3 and mounting cap 8 is subjected to displacement, and is up pushed up by PMT assembly 6, until on the bottom three of the window of detector 4, transparent silicon film 5, PMT assembly 6 is coupled smoothly.Now there is deformation in spring 7, produces reacting force, and one-piece construction is locked.
Five, the signal wire 9 of PMT assembly 6 is passed by the aperture on mounting cap 8.
Six, shield 1 adopts that lead brick is stacking to be formed.Signal wire 9 also needs to be connected on gamma-ray spectrometey 2 through shield 1 (lead brick).
See Fig. 2, the invention allows for a kind of method measuring detector response function, comprising:
When step 200, difference between the density of the naked crystal in the density and detector of transparent silicon film are minimum, measure the counting of detector when not placing radioactive source.
In this step, because the length changing spring can change the density of transparent silicon film, and the length of thread engagement changed between mounting cylinder and mounting cap can change the length of spring, therefore, the length of spring can be adjusted by the length of thread engagement changed between mounting cylinder and mounting cap, also just can adjust the density of transparent silicon film.
When difference between the density of the naked crystal in the density and detector of transparent silicon film is minimum, measure the peak that obtains and ideal position closest, namely the photon number owing to can enter PMT assembly in the photon of radioactive source rays excite is maximum, thus the counting of the detector obtained by energy spectrometer measurement is the most accurately.Therefore, when adjusting the length of spring, can by the curved line relation between the counting of the detector on observation energy spectrometer and the energy of ray arrival detector, make the peak of curve and ideal position closest, just can ensure that the difference between the density of transparent silicon film and the density of detector is minimum.
Wherein, ideal position is known in advance.
In this step, physical length when can also measure best spring pressure between mounting cap and mounting cylinder, best spring pressure is calculated according to the physical length between mounting cap and mounting cylinder, namely best spring pressure can be calculated by Hooke's law, namely the initial length between mounting cap and mounting cylinder and the difference between mounting cap and the physical length of mounting cylinder, and the product between the rigidity value of spring.So also for determining that the optimum coupling degree of detector and PMT provides theoretical foundation, also standard is provided to the mounting process of later geochemical well logging instrument gamma-ray probe.
In this step, the counting of detector is the reading of energy spectrometer.
In this step, when not placing radioactive source, the counting of the detector that measurement obtains is in surrounding environment the ray that can be detected device and receive.
Step 201, measure the counting of detector when placing radioactive source.
In this step, in order to ensure the radiation field isotropy of radioactive source, radioactive source can also be embedded in polyethylene spheres inside.
In this step, radioactive source can be placed on the predeterminable range place of the naked crystal on side face element line mid point in range finder, measure the counting of detector when current length is constant.Wherein, predeterminable range can be 10 centimetres (cm).
In this step, radioactive source can be gamma-rays radioactive source (as 37Cs, 22Na, 60Co etc.).
The counting of step 202, replacing radioactive source duplicate measurements detector.
Step 203, according to the counting measuring detector corresponding to each radioactive source of obtaining, and the response function of the counting matching detector of the detector that measurement obtains when not placing radioactive source.
In this step, according to formula
the response function of matching detector.
Wherein, f (E) for energy be the ray of E probability density (counting of detector that namely measurement obtains when placing radioactive source and when not placing radioactive source the detector that measurement obtains counting between difference), C is normaliztion constant, E is the energy after broadening, namely ray arrives the energy of detector, E
0for the energy of non-broadening, i.e. the energy of radioactive source, A is Gaussian width.
Wherein, C and A is the parameter needing in fit procedure to determine.
It should be noted that; above-described embodiment is only understand for the ease of those skilled in the art; be not limited to protection scope of the present invention; under the prerequisite not departing from inventive concept of the present invention, any apparent replacement and improvement etc. that those skilled in the art make the present invention are all within protection scope of the present invention.
Claims (5)
1. measure a device for detector response function, it is characterized in that, at least comprise:
Energy spectrometer (2), mounting cylinder (3), the transparent silicon film (5) scribbling photoelectric coupling agent, photomultiplier PMT assembly (6), spring (7), the mounting cap (8) be connected with one end of mounting cylinder (3), for being connected the signal wire (9) of energy spectrometer (2) and PMT assembly (6);
Wherein, the other end of mounting cylinder (3) is connected with detector (4) shell, detector (4) is coupled by transparent silicon film (5) and PMT assembly (6), one end of spring (7) is connected with PMT assembly (6), and the other end of spring (7) is connected with mounting cap (8).
2. device according to claim 1, is characterized in that, also comprises: be positioned at the shield (1) between described energy spectrometer (2) and described mounting cylinder (3).
3. device according to claim 1 and 2, is characterized in that, the other end of described mounting cylinder (3) is connected by screw with between described detector (4) shell.
4. device according to claim 1 and 2, is characterized in that, one end of described mounting cap (8) and described mounting cylinder (3) is threaded connection.
5. measure a method for detector response function, it is characterized in that, comprising:
When difference between the density of the naked crystal in the density and detector of transparent silicon film is minimum, measure the counting of detector when not placing radioactive source;
The counting of detector is measured when placing radioactive source;
Change the counting of radioactive source duplicate measurements detector;
According to the counting measuring detector corresponding to each radioactive source of obtaining, and the response function of the counting matching detector of the detector that measurement obtains when not placing radioactive source.
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2014
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| CN101198886A (en) * | 2005-11-30 | 2008-06-11 | 独立行政法人放射线医学综合研究所 | Radiation measuring device and data processing method |
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| KR20090043938A (en) * | 2007-10-30 | 2009-05-07 | 중앙대학교 산학협력단 | Method and apparatus for analyzing constituent elements of object and method and apparatus for imaging object 3-dimensionally using the same |
| CN101571596A (en) * | 2008-04-29 | 2009-11-04 | 清华大学 | System and method for measuring pulse type ray energy spectrum |
| CN101737032A (en) * | 2010-01-04 | 2010-06-16 | 大庆石油管理局 | Gamma ray detector in carbon/oxygen spectral logging system with alpha particles |
| CN103853929A (en) * | 2014-03-17 | 2014-06-11 | 东华理工大学 | Low-resolution gamma energy spectrum inversion analysis process and method based on Monte Carlo response matrix |
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Address after: 100010 Chaoyangmen North Street, Dongcheng District, Dongcheng District, Beijing Co-patentee after: China Oilfield Services Limited Patentee after: China Offshore Oil Group Co., Ltd. Address before: 100010 Chaoyangmen North Street, Dongcheng District, Dongcheng District, Beijing Co-patentee before: China Oilfield Services Limited Patentee before: China National Offshore Oil Corporation |
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