CN104360369B - A kind of method and apparatus for measuring detector response function - Google Patents
A kind of method and apparatus for measuring detector response function Download PDFInfo
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- CN104360369B CN104360369B CN201410641929.2A CN201410641929A CN104360369B CN 104360369 B CN104360369 B CN 104360369B CN 201410641929 A CN201410641929 A CN 201410641929A CN 104360369 B CN104360369 B CN 104360369B
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Abstract
The invention discloses a kind of method and apparatus for measuring detector response function, at least include：The mounting cap (8) that energy disperse spectroscopy (2), mounting cylinder (3), the transparent silicon film (5) for scribbling photoelectric coupling agent, photomultiplier PMT assemblies (6), spring (7) are connected with one end of mounting cylinder (3), the holding wire (9) for connecting energy disperse spectroscopy (2) and PMT assemblies (6)；Wherein, the other end of mounting cylinder (3) is connected with detector (4) shell, detector (4) is coupled by transparent silicon film (5) with PMT assemblies (6), one end of spring (7) is connected with PMT assemblies (6), and the other end of spring (7) is connected with mounting cap (8).By the solution of the present invention, the measurement to the receptance function of detector is realized.
Description
Technical field
The present invention relates to detector field, espespecially a kind of method and apparatus for measuring detector response function.
Background technology
At present, domestic Nuclear Logging Tools research and development are not especially to pay attention to gamma ray detector receptance function, cause batch to produce
The result that the final result for measuring of the Nuclear Logging Tools of industry is measured with external instrument has differences.Therefore, spy is accurately measured
Survey the receptance function of device, the response letter of bismuth germanium oxide (BGO) detector used in the geochemical well logging instrument especially researched and developed
Number is very important.And not yet there is correlation technique to disclose the technical scheme of measurement detector response function at present.
The content of the invention
In order to solve the above problems, the present invention proposes a kind of method and apparatus for measuring detector response function, can
Measure the receptance function of detector.
In order to achieve the above object, the present invention proposes a kind of device for measuring detector response function, at least includes：
Energy disperse spectroscopy (2), mounting cylinder (3), the transparent silicon film (5) for scribbling photoelectric coupling agent, photomultiplier PMT assemblies
(6) mounting cap (8) that, spring (7) is connected with one end of mounting cylinder (3), for connecting energy disperse spectroscopy (2) and PMT assemblies (6)
Holding wire (9)；
Wherein, the other end of mounting cylinder (3) is connected with detector (4) shell, and detector (4) is by transparent silicon film (5)
It is coupled with PMT assemblies (6), one end of spring (7) is connected with PMT assemblies (6), the other end and mounting cap (8) phase of spring (7)
Even.
Preferably, also include：Shield (1) between the energy disperse spectroscopy (2) and the mounting cylinder (3).
Preferably, it is connected by screw between the other end of the mounting cylinder (3) and the detector (4) shell.
Preferably, one end of the mounting cap (8) and the mounting cylinder (3) is connected through a screw thread.
The invention allows for a kind of method for measuring detector response function, including：
When the difference between the density of the bare crystalline body in the density and detector of transparent silicon film is minimum, without placement
The counting of detector is measured during radioactive source；
The counting of measurement detector when radioactive source is placed；
Change the counting of radioactive source duplicate measurements detector；
The counting of the corresponding detector of each radioactive source obtained according to measurement, and obtained without measurement when placing radioactive source
The receptance function of the counting fitting detector of detector.
Compared with prior art, the present invention includes：Energy disperse spectroscopy 2, mounting cylinder 3, the transparent silicon film for scribbling photoelectric coupling agent
5th, photomultiplier PMT assemblies 6, spring 7 are connected with one end of mounting cylinder 3 mounting cap 8, for connecting energy disperse spectroscopy 2 and PMT
The holding wire 9 of assembly 6；Wherein, the other end of mounting cylinder 3 is connected with the shell of detector 4, detector 4 by transparent silicon film 5 with
PMT assemblies 6 are coupled, and one end of spring 7 is connected with PMT assemblies 6, and the other end of spring 7 is connected with mounting cap 8.By this hair
Bright scheme, realizes the measurement to the receptance function of detector.
Brief description of the drawings
The accompanying drawing in the embodiment of the present invention is illustrated below, the accompanying drawing in embodiment be for it is of the invention enter one
Step understanding, is used to explain the present invention together with specification, does not constitute limiting the scope of the invention.
Fig. 1 is the structure composition schematic diagram of the device of present invention measurement detector response function；
Fig. 2 is the flow chart of the method for present invention measurement detector response function；
In figure, 1 is shield, and 2 is energy disperse spectroscopy, and 3 is mounting cylinder, and 4 is detector, and 5 is transparent silicon film, and 6 is that PMT is total
Into 7 is spring, and 8 is mounting cap, and 9 is holding wire.
Specific embodiment
For the ease of the understanding of those skilled in the art, the invention will be further described below in conjunction with the accompanying drawings, not
Can be used for limiting the scope of the invention.
Referring to Fig. 1, the present invention proposes a kind of device for measuring detector response function, at least includes：
Energy disperse spectroscopy 2, mounting cylinder 3, the transparent silicon film 5 for scribbling photoelectric coupling agent, photomultiplier (PMT, Photo
Multiplier Tube) assembly 6, spring 7 be connected with one end of mounting cylinder 3 mounting cap 8, for connecting energy disperse spectroscopy 2 and PMT
The holding wire 9 of assembly 6.
Wherein, the other end of mounting cylinder 3 is connected with the shell of detector 4, and detector 4 is by transparent silicon film 5 and PMT assemblies
6 are coupled.
Wherein, can be connected by screw between the other end of mounting cylinder 3 and the shell of detector 4.Specifically, can visit
Survey the shell of device 4 and four screwed holes are set, four countersunk screw holes are set on the tail end of mounting cylinder 3, by four on the shell of detector 4
Individual screwed hole is positioned on four countersunk screw holes of the tail end of mounting cylinder 3.
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 assemblies 6, and the other end of spring 7 is connected with mounting cap 8.Specifically, spring
7 one end is placed on the cylindrical boss of the end face of PMT assemblies 6, and the other end of spring 7 then withstands on the internal end surface of mounting cap 8
On.
Wherein, detector is an assembly, and wrapping up a bare crystalline body by a metal shell constitutes.For example, BGO detectors
A BGO crystal (bare crystalline body) is wrapped up by a metal shell to constitute, one layer of buffer layer is provided between BGO and shell.
Wherein, one end of mounting cap 8 and mounting cylinder 3 can be connected through a screw thread, and the length of the threaded engagement is adjustable.
By device of the invention, the measurement to detector response function is realized.
In device of the invention, also including the shield 1 for shielding energy disperse spectroscopy 2, shield 1 is located at energy disperse spectroscopy 2 and peace
Between fitted tube 3.Wherein, shield 1 can be lead brick.
Illustrate how that device of the invention is installed by taking BGO as an example below.
Firstth, it is gamma-rays radioactive source to use 137Cs, and this radioactive source (point source) is embedded in a polyethylene spheres
Portion, can so ensure that radiation field is isotropic.
Secondth, bismuth germanium oxide (BGO) detector 4 is put into mounting cylinder 3, and by four fixing screws by detector 4 with
Mounting cylinder 3 is positioned.
3rd, the both sides of transparent silicon film 5 are applied and spreads appropriate photoelectric coupling agent, and be attached to the bottom of PMT assemblies 6
Portion.
4th, by the assembly push-in mounting cylinder 3 of PMT assemblies 6 and transparent silicon film 5.The bottom of mounting cap 8 is rotated with spanner
Six sides in portion, mounting cylinder 3 will pass through threaded connection and is integrally formed with mounting cap 8.And constantly screwing with screw thread, mounting cylinder 3
Be subjected to displacement with the spring between mounting cap 8, PMT assemblies 6 up pushed up, until the window of detector 4, transparent silicon film 5,
The bottom three of PMT assemblies 6 is smoothly in coupling.Now spring 7 is deformed upon, and produces reaction force, and overall structure is locked.
5th, the holding wire 9 of PMT assemblies 6 is then passed by the aperture on mounting cap 8.
6th, shield 1 is formed using lead brick stacking.Holding wire 9 also needs guiding through shield 1 (lead brick) and is connected to gamma-rays
On energy disperse spectroscopy 2.
Referring to Fig. 2, the invention allows for a kind of method for measuring detector response function, including：
Step 200, when the difference between the density of the bare crystalline body in the density and detector of transparent silicon film is minimum,
Counting without measurement detector when placing radioactive source.
In this step, because the length for changing spring can change the density of transparent silicon film, and change mounting cylinder with peace
Length of thread engagement between dress cap can change the length of spring, therefore, it is possible to pass through to change between mounting cylinder and mounting cap
Length of thread engagement adjust the length of spring, also can just adjust the density of transparent silicon film.
When the difference between the density of the bare crystalline body in the density and detector of transparent silicon film is minimum, what measurement was obtained
Peak is closest with ideal position, i.e., can enter the number of photons of PMT assemblies in the photon for being excited due to radioactive source ray
Mesh is most, so as to the counting of the detector obtained by energy disperse spectroscopy measurement is most accurate.Therefore, when the length of spring is adjusted,
Can be by the curved line relation between the counting of detector observed on energy disperse spectroscopy and the energy of ray arrival detector so that bent
The peak of line is closest with ideal position, it becomes possible to ensure the difference between the density of transparent silicon film and the density of detector
Value is minimum.
Wherein, ideal position is previously known.
In this step, physical length when can also measure optimal spring pressure between mounting cap and mounting cylinder, according to peace
Physical length between dress cap and mounting cylinder calculates optimal spring pressure, i.e., optimal spring pressure can be counted by Hooke's law
Obtain, i.e., the difference between initial length and mounting cap and the physical length of mounting cylinder between mounting cap and mounting cylinder, with
Product between the rigidity value of spring.Theoretical foundation also so is provided with the Best Coupling degree of PMT to determine detector, it is also right
The mounting process of later geochemical well logging instrument gamma-ray probe provides standard.
In this step, the counting of detector is the reading of energy disperse spectroscopy.
In this step, can be by the counting as surrounding environment of detector obtained without measurement when placing radioactive source
The ray that detector is received.
Step 201, place radioactive source when measurement detector counting.
In this step, in order to ensure the radiation field isotropism of radioactive source, radioactive source can also be embedded in polyethylene ball
Internal portion.
In this step, the predeterminable range at the bare crystalline body side surface element line midpoint that radioactive source can be placed in range finder
Place, the counting of detector is measured when current length is constant.Wherein, predeterminable range can be 10 centimetres (cm).
In this step, radioactive source can be gamma-rays radioactive source (such as 37Cs, 22Na, 60Co).
Step 202, the counting for changing radioactive source duplicate measurements detector.
The counting of step 203, the corresponding detector of each radioactive source obtained according to measurement, and without survey when placing radioactive source
The receptance function of the counting fitting detector of the detector for measuring.
In this step, according to formulaIt is fitted the receptance function of detector.
Wherein, f (E) is that energy is the probability density (detector that i.e. measurement is obtained when radioactive source is placed of the ray of E
Count and the difference between the counting of the detector obtained without measurement when placing radioactive source), C is normaliztion constant, and E is exhibition
Energy after width, i.e. ray reach the energy of detector, E0It is the energy of the energy of non-broadening, i.e. radioactive source, A is that Gauss is wide
Degree.
Wherein, C and A be fit procedure in it needs to be determined that parameter.
It should be noted that embodiment described above be for only for ease of it will be understood by those skilled in the art that, and
It is not used in and limits the scope of the invention, on the premise of inventive concept of the invention is not departed from, those skilled in the art couple
Any obvious replacement made of the invention and improvement etc. are within protection scope of the present invention.
Claims (4)
1. it is a kind of measure detector response function device, it is characterised in that at least include：
Energy disperse spectroscopy (2), mounting cylinder (3), the transparent silicon film (5) for scribbling photoelectric coupling agent, photomultiplier PMT assemblies (6), bullet
The mounting cap (8) that spring (7) is connected with one end of mounting cylinder (3), the holding wire for connecting energy disperse spectroscopy (2) and PMT assemblies (6)
(9)；
Wherein, the other end of mounting cylinder (3) is connected with detector (4) shell, and detector (4) is by transparent silicon film (5) and PMT
Assembly (6) is coupled, and one end of spring (7) is connected with PMT assemblies (6), and the other end of spring (7) is connected with mounting cap (8)；
One end of the mounting cap (8) and the mounting cylinder (3) is connected through a screw thread；
During installation, the mounting cap (8) is rotated, it is continuous with the screw thread between the mounting cap (8) and the mounting cylinder (3)
Screw, the mounting cylinder (3) is subjected to displacement with the spring between the mounting cap (8), promote the PMT assemblies (6) with it is described
Transparent silicon film (5), the detector (4) are smoothly coupled.
2. device according to claim 1, it is characterised in that also include：Positioned at the energy disperse spectroscopy (2) and the mounting cylinder
(3) shield (1) between.
3. device according to claim 1 and 2, it is characterised in that the other end and the detector of the mounting cylinder (3)
(4) it is connected by screw between shell.
4. it is a kind of measure detector response function method, it is characterised in that
The device for measuring detector response function includes：Energy disperse spectroscopy (2), mounting cylinder (3), the transparent silica gel for scribbling photoelectric coupling agent
Mounting cap (8) that piece (5), photomultiplier PMT assemblies (6), spring (7) are connected with one end of mounting cylinder (3), for connecting
The holding wire (9) of energy disperse spectroscopy (2) and PMT assemblies (6)；
Wherein, the other end of mounting cylinder (3) is connected with detector (4) shell, and detector (4) is by transparent silicon film (5) and PMT
Assembly (6) is coupled, and one end of spring (7) is connected with PMT assemblies (6), and the other end of spring (7) is connected with mounting cap (8)；
One end of the mounting cap (8) and the mounting cylinder (3) is connected through a screw thread；
Methods described includes：
The length of spring (7) is adjusted by changing the length of thread engagement between mounting cylinder (3) and mounting cap (8), so as to adjust
The density of whole transparent silicon film (5)；
When the difference between the density of the bare crystalline body in the density and detector (4) of transparent silicon film (5) is minimum, do not putting
The counting of measurement detector (4) when putting radioactive source；
The counting of measurement detector (4) when radioactive source is placed；
Change the counting of radioactive source duplicate measurements detector (4)；
The counting of the corresponding detector of each radioactive source (4) obtained according to measurement, and obtained without measurement when placing radioactive source
The receptance function of counting fitting detector (4) of detector (4).
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
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| JP4127840B2 (en) * | 2005-11-30 | 2008-07-30 | 独立行政法人放射線医学総合研究所 | Radiation measurement apparatus and data processing method |
| JP2010510514A (en) * | 2006-11-21 | 2010-04-02 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | Apparatus and method for determining a detector energy weight function of a detection unit |
| KR100952209B1 (en) * | 2007-10-30 | 2010-04-09 | 중앙대학교 산학협력단 | Method and apparatus for analyzing constituent elements of object |
| CN101571596B (en) * | 2008-04-29 | 2016-09-21 | 清华大学 | Measure the system and method for pulse type ray energy spectrum |
| CN103853929B (en) * | 2014-03-17 | 2016-06-15 | 东华理工大学 | A kind of based on the low resolution gamma spectrum inversion analysis system and method covering card response matrix |
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| 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 |
Non-Patent Citations (1)
| Title |
|---|
| Precise Monte Carlo simulation of gamma-ray response functions for an NaI(Tl) detector;Hu-Xia Shi等;《Applied Radiation and Isotopes》;20021031;第57卷(第4期);第518-522页 * |
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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 |