CN103731966A - Integrated fluorescence generating device - Google Patents
Integrated fluorescence generating device Download PDFInfo
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- CN103731966A CN103731966A CN201410004424.5A CN201410004424A CN103731966A CN 103731966 A CN103731966 A CN 103731966A CN 201410004424 A CN201410004424 A CN 201410004424A CN 103731966 A CN103731966 A CN 103731966A
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Abstract
The invention discloses an integrated fluorescence generating device which comprises a device body, a primary diaphragm, a primary filter, an irradiator, an irradiator support, a secondary filter and a secondary diaphragm. The device body is a hollow cavity. All parts are arranged in the device body, and an integrated fluorescence generating device is formed. The integrated fluorescence generating device is compact and stable in structure, stability of irradiating output is guaranteed, a photon path is short, fluorescent yield maximization and shielding maximization are achieved, and influence on K alpha fluorescence purity from device external scattered radiation is fully lowered.
Description
Technical field
The present invention relates to K
αfluorescent X-ray generating means, relates in particular to integrated high-purity K
αfluorescence generating means.
Background technology
X-ray machine is a kind of comparatively conventional ray radiation source, is widely used in the fields such as medical diagnosis, industrial flaw detection, security safety check and scientific research.In metrological application, be wherein mainly the output that some particular requirements can section be provided at X-ray machine, so that the calibrated radiation source that provides calibrating and measuring to use for the radiation monitoring instrument in above-mentioned field.
In the photon reference radiation of the energy of recommending at international standard ISO4037-1 within the scope of 8keV～100keV, fluorescent X-ray had both had the monochromaticjty that filter tow X ray cannot replace, there is again the isotope gamma ray radiator high dose rate that is beyond one's reach, thereby be widely used in the work such as radiation protection instrument energy response calibration, spectrometer low energy region energy calibration and the test of protective materials shielding properties.Fluorescent X-ray reference radiation is take certain material as radiant body, utilizes bremstrahlen X ray and its interaction, produces and comprises K
α, K
βwith L at interior series of features X ray.With K Absorption Edge between radiant body K
αand K
βmaterial between line is secondary filter, eliminates L line and reduces K
βwith respect to K
αthe intensity of line, and then obtain highly purified K
αfluorescent X-ray.Fluorescent X-ray Reference radiation field and fluorescence produce principle schematic respectively as shown in Figure 1, 2.In Fig. 1, X-ray machine 101 sends alpha spectrum A, through primary filter, obtains alpha spectrum B and incides on radiant body 102, and beam trap 103 is for collecting initial X-ray to reduce scattering radiation.Shutter 104 is for controlling the outgoing time of ray, additional filter 105 filters for the beam to outgoing, diaphragm 106 is controlled the beam size of outgoing, monitor 107 is for monitoring ray, the alpha spectrum D of outgoing is irradiated to standard chamber 108, field of employment and personal dosimeter 109 measure, to obtain X ray Reference radiation field.Fig. 2 is that fluorescence produces principle schematic.Radiant body absorbs after energy, and electronics jumps to scrape and adjourns high energy excited state, from high energy excited state, transits to lower state or ground state is to produce K
α, K
βwith L at interior series of features X ray.
Conventional fluorescent X-ray generating means schematic diagram as shown in Figure 3.This device is comprised of elementary diaphragm 2, primary filter 3, radiant body 4, radiant body support 5, shielding eyelid retractor 6, secondary filter 7 and secondary diaphragm 8, and X-ray incides radiant body 4 from entrance port 1 and produces K
α, K
βat interior series of features X ray, after secondary filter 7, remain the comparatively K of pure color with L
αfluorescent X-ray, take direction 9 as axle center outgoing.Mainly there is following problem in this device.1, as can be seen from the figure, this photon path of 1-4-9 is completely exposed, and this makes not only to contain through the radiation beam of secondary filter 7 the serial characteristic X-ray that radiant body 4 sends, and has also comprised the scattering radiation of whole device in 4-9 direction.These scattering radiations can be filtered out by secondary filter 7 hardly, and then cause K in emerging beam
αthe reduction of fluorescence purity.2, device stability problem, for reference radiation, a very crucial technical indicator is exactly the stability of radiant output, and the stability of output depends on the stability of apparatus structure significantly.For existing apparatus, nearly all assembly has all adopted independent fixing mode, has increased greatly device destabilizing factor, thereby affects the stability of radiant output.3, the secondary diaphragm 8 of this device is a kind of simple single hole diaphragm, and this diaphragm is deposited problem both ways.On the one hand, radiant body 4 is equivalent to a face source, single hole diaphragm cannot effectively limit emerging beam shape, can produce larger penumbra region, and then affects the K of check point place (for example 1m place)
αthe purity of fluorescence; On the other hand, the edge scatter photon of single hole diaphragm can enter main beam, causes equally K
αthe reduction of fluorescence purity.4, the use problem of compound secondary filter, the pertinent literature that there is no at present fluorescent X-ray reference radiation compound secondary filter preparation method is delivered, and in ISO4037-1, recommend 16 in fluorescent radiation matter, compound secondary filter has 6 kinds.
Summary of the invention
The technical problem to be solved in the present invention is to make K
αthe each parts of fluorescent X-ray generating means can be stablized and are installed together, and form integrated K-fluorescence generating means.For solving the problems of the technologies described above, the present invention improves existing apparatus framework and secondary mechanism of diaphragm, and has proposed two kinds of effective secondary filter manufacture methods.
According to a first aspect of the invention, a kind of integrated fluorescence generating means is provided, it comprises apparatus main body, elementary diaphragm, primary filter, radiant body, radiant body support, secondary filter and secondary diaphragm, wherein, described apparatus main body is hollow cylinder, on the sidewall of its first end, be provided with the ray incidence window for described elementary diaphragm and described primary filter are installed, the second end is ray outgoing window; Described radiant body support is the flat board that is miter angle with the main shaft of described apparatus main body and is placed in the first end of described apparatus main body, make from the ray of described ray incidence window vertical incidence with respect to this flat board miter angle to described radiant body incident, the major axes orientation that the ray of outgoing is parallel to described apparatus main body penetrates by described ray outgoing window; Described secondary filter and secondary diaphragm are placed in described apparatus main body successively, in the ray path of described radiant body outgoing.
According to a second aspect of the invention, provide integrated fluorescence generating means, wherein, described primary filter and described elementary diaphragm split is fastening is installed in described ray incidence window.
According to a third aspect of the present invention, integrated fluorescence generating means is provided, wherein, described secondary diaphragm comprises from inside to outside the first sub-diaphragm, the second sub-diaphragm and the 3rd sub-diaphragm of placement separated from one another successively, described the second sub-diaphragm is the trap of described the first sub-diaphragm edge scatter photon, and described the 3rd sub-diaphragm is the trap of described the second sub-diaphragm edge scatter photon.
According to a fourth aspect of the present invention, provide integrated fluorescence generating means, wherein, described the 3rd sub-aperture of the diaphragm is greater than the cross section of the main beam at its place, position.
According to a fifth aspect of the present invention, provide integrated fluorescence generating means, wherein, described secondary filter is the poly (methyl methacrylate) plate with filter course.
According to a sixth aspect of the invention, provide integrated fluorescence generating means, wherein, described radiant body is Zn, Zr, Mo, Sn and Cs
2sO
4one of them.
According to a seventh aspect of the present invention, provide integrated fluorescence generating means, wherein, described radiant body is Zn, Zr, Mo, Sn and Cs
2sO
4one of them; Described secondary filter is Cu filter, SrCO accordingly
3filter, Zr filter, Ag filter and TeO
2filter.
Integrated fluorescence generating means provided by the invention has the following advantages: 1, compact conformation is stable, and radiant body and secondary filter are solidified in polymethyl methacrylate internal stent, has avoided the position skew causing because changing radiation quality.Primary filter, elementary diaphragm and secondary diaphragm design for split, simultaneously again can close-fitting erecting device framework on, i.e. convenient test, has guaranteed again the stability of radiant output.2, photon path is the shortest, from structural design, has guaranteed fluorescent yield maximization.3, shielding maximizes, and has fully reduced the outside scattering radiation of device to K
αthe impact of fluorescence purity.4, use multiple diaphragms that are arranged in order, limited edge scatter photon and entered main beam, improved K
αthe purity of fluorescence.
Accompanying drawing explanation
Fig. 1 is K-fluorescent X-ray reference radiation schematic diagram;
Fig. 2 (a) and Fig. 2 (b) are K-fluorescent X-ray reference radiation schematic diagram;
Fig. 3 is conventional fluorescence generating means sectional view;
Fig. 4 is integrated fluorescence generating means schematic cross-section of the present invention;
Pulse-height spectrum when Fig. 5 (a) and Fig. 5 (b) are respectively integrated fluorescence generating means use radiation quality F-Cs of the present invention and radiationless matter.
Embodiment
For making the object, technical solutions and advantages of the present invention more cheer and bright, below in conjunction with embodiment and with reference to accompanying drawing, the present invention is described in more detail.Should be appreciated that, these descriptions are exemplary, and do not really want to limit the scope of the invention.In addition, in the following description, omitted the description to known configurations and technology, to avoid unnecessarily obscuring concept of the present invention.
Through the analysis to existing fluorescence generating means shortcoming, developed novel all-in-one fluorescence generating means, its cross sectional representation is as shown in Figure 4.Fig. 4 is integrated fluorescence generating means schematic cross-section of the present invention.First embodiment of the invention, integrated fluorescence generating means of the present invention comprises apparatus main body 6, elementary diaphragm 2, primary filter 3, radiant body 4, radiant body support 5, secondary filter 7 and secondary diaphragm 8.X ray, by 1 incident of incident beam axis, is irradiated to radiant body 4 on radiant body support 5 through elementary diaphragm 2, primary filter 3, and secondary filter 7, the secondary diaphragm 8 from the beam of radiant body 4 outgoing, through apparatus main body 6, installed penetrate along emerging beam axis 9.Apparatus main body 6 is hollow cavity, and on the sidewall of its first end, (in Fig. 4, being left end upside) is provided with the ray incidence window for elementary diaphragm 2 and primary filter 3 are installed, and the second end is ray outgoing window (being right-hand member in Fig. 4); Radiant body support 5 is the flat board that is miter angle with the main shaft of apparatus main body 6 and is placed in the first end of apparatus main body 6, make from the ray of ray incidence window vertical incidence with respect to this flat board miter angle to radiant body 4 incidents, the major axes orientation that the ray of outgoing is parallel to apparatus main body 6 penetrates by ray outgoing window; Secondary filter 7 and secondary diaphragm 8 are placed in apparatus main body 6, the ray path of radiant body 4 outgoing successively.The interior hollow space of apparatus main body 6 is cylindrical cavity substantially, and its rotating shaft is the main shaft of apparatus main body 6, and outside can be cylindricality, is preferably six cylindricalitys.
Second embodiment of the invention, primary filter 3 and fastening being installed in ray incidence window of elementary diaphragm 2 splits.Like this, can change flexibly primary filter 3 or elementary diaphragm 2.
According to the 3rd execution mode of the present invention, secondary diaphragm 8 comprises from inside to outside the first sub-diaphragm, the second sub-diaphragm and the 3rd sub-diaphragm of placement separated from one another successively, the second sub-diaphragm is the trap of the first sub-diaphragm edge scatter photon, and the 3rd sub-diaphragm is the trap of the second sub-diaphragm edge scatter photon.That is, this diaphragm is comprised of three tactic diaphragms, between diaphragm, is separated each other by certain space, and each space is as the trap of last diaphragm edge scatter photon.In addition, according to the 4th execution mode of the present invention, last aperture of the diaphragm is slightly larger than the cross section of the main beam of this point.Such consequence devised can effectively control the size of emerging beam penumbra region, can reduce again the scattering radiation that diaphragm self causes, thereby improves K in emerging beam
αfluorescence purity.Each parts all, being arranged in apparatus main body, form integrated fluorescence generating means.
This device has the following advantages: 1, compact conformation is stable, and radiant body 4 and secondary filter 7 are solidified in polymethyl methacrylate internal stent, has avoided the position skew causing because changing radiation quality.Primary filter, elementary diaphragm and secondary diaphragm design for split, simultaneously again can close-fitting erecting device framework on, i.e. convenient test, has guaranteed again the stability of radiant output.2, photon path is the shortest, from structural design, has guaranteed fluorescent yield maximization.3, shielding maximizes, and has fully reduced the outside scattering radiation of device to K
αthe impact of fluorescence purity.
Also come into the open two kinds of manufacture methods of compound secondary filter of the present invention.Because compound secondary filter is divided into water-soluble and water insoluble two kinds, therefore adopt respectively Method for bonding and PVA masking legal system to make secondary filter.
(1) Method for bonding is made secondary filter
The method is applicable to water-fast compound secondary filter.Secondary filter powder is divided into some parts, and every part attaches on band glue PE film by screen method, within finally film being placed in to secondary filter draw-in groove, is made into secondary filter card.
(2) PVA masking legal system is made secondary filter
A, weigh appropriate PVA material, water-soluble compound-material, ionized water, compound and PVA are dissolved with deionized water;
B, the beaker that the PVA aqueous solution is housed is put into water-bath, be placed on constant-temperature heating magnetic stirring apparatus and constantly stir, finally form transparent liquid, stop heating and continue and stir;
C, after a period of time to be cooled, use glass bar compound solution is drained in PVA solution, stir;
D, use glass bar drain into this solution on a glass plate, put into clean room dry;
E, after bone dry, as entirety presents transparence, without bubble and compound, separate out, illustrate that film uniformity is better, just within film can being placed in to secondary filter draw-in groove, be made into secondary filter card.
According to the 5th execution mode of the present invention, secondary filter is the poly (methyl methacrylate) plate with filter course.
According to the 6th execution mode of the present invention, radiant body is Zn, Zr, Mo, Sn and Cs
2sO
4one of them.
According to the 7th execution mode of the present invention, radiant body is Zn, Zr, Mo, Sn and Cs
2sO
4one of them; Secondary filter is Cu filter, SrCO accordingly
3filter, Zr filter, Ag filter and TeO
2filter.That is,, when radiant body is Zn, secondary filter is Cu filter accordingly; When radiant body is Zr, secondary filter is SrCO accordingly
3filter; When radiant body is Mo, secondary filter is Zr filter accordingly; When radiant body is Sn, secondary filter is Ag filter accordingly; When radiant body is Cs
2sO
4time, secondary filter is TeO accordingly
2filter.
As shown in table 1, listed 5 kinds of radiation quality radiation beam output doses below.
The output of table 1 fluorescence beam
5 kinds of radiation quality radiation beam K
αfluorescence purity analysis result is as shown in table 2.
Purity analysis result under the different voltage of table 2 radiation quality
For determining that the caused scattering radiation of this device is to K
αthe impact of fluorescence purity, utilize CdZnTe spectrometer system (obtained software and shielded collimator apparatus by CdZnTe detector, DSA1000 digitlization multichannel analyser, Genie2000 spectrum and form) at emerging beam axial direction, apart from the difference measuring radiation matter F-Cs of 1m place, radiant body center, (radiant body is Cs
2sO
4, secondary filter is TeO
2) and pulse-height spectrum during radiationless matter, Measuring Time: 300s, tube voltage: 100kV, tube current: 5mA, measurement result is as shown in Figure 5.As known in the figure, during radiationless matter, step-by-step counting is only 0.05% of F-Cs pulse tale, illustrate through improve after the caused scattering radiation of fluorescence generating means to K
αthe impact of fluorescence purity can be ignored.
Experimental result surface, 16cm in vertical range, in horizontal range, the variation of the interior air kerma of the scope of 22cm is in 5%.40cm place, left side air kerma rate is 0; It is 0.8nGys that air kerma rate is entered at 40cm place, right side
-1; Account for 0.1% of fluorescent radiation, much smaller than 0.5% of iso standard regulation, therefore the contribution of scattering radiation meets and meets international standard regulation completely.
Should be understood that, above-mentioned embodiment of the present invention is only for exemplary illustration or explain principle of the present invention, and is not construed as limiting the invention.Therefore any modification of, making, be equal to replacement, improvement etc., within protection scope of the present invention all should be included in without departing from the spirit and scope of the present invention in the situation that.In addition, claims of the present invention are intended to contain whole variations and the modification in the equivalents that falls into claims scope and border or this scope and border.
Claims (7)
1. an integrated fluorescence generating means, it comprises apparatus main body, elementary diaphragm, primary filter, radiant body, radiant body support, secondary filter and secondary diaphragm, it is characterized in that:
Described apparatus main body is hollow cavity, is provided with the ray incidence window for described elementary diaphragm and described primary filter are installed on the sidewall of its first end, and the second end is ray outgoing window;
Described radiant body support is the flat board that is miter angle with the main shaft of described apparatus main body and is placed in the first end of described apparatus main body, make from the ray of described ray incidence window vertical incidence with respect to this flat board miter angle to described radiant body incident, the major axes orientation that the ray of outgoing is parallel to described apparatus main body penetrates by described ray outgoing window;
Described secondary filter and secondary diaphragm are placed in described apparatus main body successively, in the ray path of described radiant body outgoing.
2. integrated fluorescence generating means as claimed in claim 1, is characterized in that:
Described primary filter and described elementary diaphragm split is fastening is installed in described ray incidence window.
3. integrated fluorescence generating means as claimed in claim 1, is characterized in that:
Described secondary diaphragm comprises from inside to outside the first sub-diaphragm, the second sub-diaphragm and the 3rd sub-diaphragm of placement separated from one another successively, described the second sub-diaphragm is the trap of described the first sub-diaphragm edge scatter photon, and described the 3rd sub-diaphragm is the trap of described the second sub-diaphragm edge scatter photon.
4. integrated fluorescence generating means as claimed in claim 3, is characterized in that:
Described the 3rd sub-aperture of the diaphragm is greater than the cross section of the main beam at its place, position.
5. integrated fluorescence generating means as claimed in claim 4, is characterized in that:
Described secondary filter is the poly (methyl methacrylate) plate with filter course.
6. integrated fluorescence generating means as claimed in claim 5, is characterized in that:
Described radiant body is Zn, Zr, Mo, Sn and Cs
2sO
4one of them.
7. integrated fluorescence generating means as claimed in claim 5, is characterized in that:
Described radiant body is Zn, Zr, Mo, Sn and Cs
2sO
4one of them; Described secondary filter is Cu filter, SrCO accordingly
3filter, Zr filter, Ag filter and TeO
2filter.
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|---|---|---|---|
| CN201410004424.5A CN103731966B (en) | 2014-01-03 | 2014-01-03 | Integration fluorescence generating means |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104936367A (en) * | 2015-07-03 | 2015-09-23 | 中国计量科学研究院 | A fluorescence generating device |
| CN104965218A (en) * | 2015-07-03 | 2015-10-07 | 中国计量科学研究院 | Secondary diaphragm |
| CN104990946A (en) * | 2015-07-03 | 2015-10-21 | 中国计量科学研究院 | K-fluorescent X-ray radiation appliance |
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2014
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104936367A (en) * | 2015-07-03 | 2015-09-23 | 中国计量科学研究院 | A fluorescence generating device |
| CN104965218A (en) * | 2015-07-03 | 2015-10-07 | 中国计量科学研究院 | Secondary diaphragm |
| CN104990946A (en) * | 2015-07-03 | 2015-10-21 | 中国计量科学研究院 | K-fluorescent X-ray radiation appliance |
| CN104936367B (en) * | 2015-07-03 | 2017-12-19 | 中国计量科学研究院 | Fluorescence generating means |
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| CN103731966B (en) | 2015-12-30 |
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