CN104936367A - A fluorescence generating device - Google Patents
A fluorescence generating device Download PDFInfo
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- CN104936367A CN104936367A CN201510388693.0A CN201510388693A CN104936367A CN 104936367 A CN104936367 A CN 104936367A CN 201510388693 A CN201510388693 A CN 201510388693A CN 104936367 A CN104936367 A CN 104936367A
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- housing
- ray
- primary
- generating means
- fluorescence generating
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Abstract
The embodiment of the invention relates to a fluorescence generating device comprising a housing which is of a quadrangular frustum structure. A cross section of the housing is in the shape of a right-angled trapezoid. A beam center direction of a ray beam ejected by a primary radiation source is perpendicular to the bottom surface of the housing. The bottom surface of the housing is provided with a primary filtering installing hole. The side surfaces perpendicular to the bottom surface and the top surface is provided with an outgoing hole. The fluorescence generating device also comprises a primary filter, a primary diaphragm, a radiator, a characteristic ray beam and a secondary filter. The primary filter is arranged in the primary filtering installing hole. A ray beam ejected by the primary radiation source is filtered by the primary filter and then enters into the fluorescence generating device. The primary diaphragm carries out beam limiting on the ray beam filtered by the primary filter. The radiator is arranged on the inner side of an inclined plane of the housing in the shape of the right-angled trapezoid. The ray beam which has been subjected to beam limiting irradiates on the radiator to excite a corresponding characteristic ray beam. The secondary filter is arranged in the housing in a mode of being perpendicular to the top surface and the bottom surface of the housing. The secondary filter sucks rays in a specific energy scope in the characteristic ray beam to obtain a radiation quality fluorescence ray which is ejected from the outgoing hole.
Description
Technical field
The present invention relates to a kind of Optical devices, particularly relate to a kind of fluorescence generating means.
Background technology
In recent decades, the development of nuclear radiation detector is very swift and violent, indicates the rapid progress of nuclear technology, and this has benefited from electronic technology and develops by leaps and bounds and the continuous breakthrough of nuclear detection technology.Detector is the important instrument equipment carrying out testing, its precision improve constantly the development that could promote nuclear technology to greatest extent.The response of nuclear radiation detector in Low Energy Region (8-100) keV is very large with energy changing, and small energy difference all may make instrument and meter occur larger response change.Therefore, need to set up the accurately known lower energy photon reference radiation of energy, for the Measurement accuracy of instrument energy response provides Metrology Support.
Radioisotope can be applicable to detector energy and efficiency calibration, and because radioactive source is all the time all in decay, long-time use needs half-life coefficient correction; Due to its small volume, it is preserved, transport, manage comparatively complexity, and the report caused any property loss is lost in relevant industrial application of radiation source often.The radiation beam that synchrotron radiation source produces is large, dose rate is high, energy point is many, but it is costly to set up Synchrotron Radiation, and plant maintenance is also very expensive, and floor space is large, uses extremely inconvenient.Utilize Prague principle, go out Single photon by bicrystal diffraction dissociation and also can be applied to detector metering scale, its energy point is many, purity is also very high, have certain range of application, but its radiation beam is little, dose rate is low, has certain limitation.
Summary of the invention
The object of the invention is the defect for prior art, a kind of fluorescence generating means is provided, adopt trapezium structure design, reasonably radiant body and secondary filter position distribution maximizedly can utilize material, cost-saving; Compact structure, makes the path minimum of photon, ensure that the maximization of fluorescent yield; Meanwhile, scattering radiation that the outside and therein of device context causes is effectively reduced to K
αthe impact of fluorescence purity.
For achieving the above object, the invention provides a kind of fluorescence generating means, described fluorescence generating means comprises:
Housing, be truncated rectangular pyramids structure, cross section is right-angled trapezium; Wherein, the bottom surface of described truncated rectangular pyramids structure housing is arranged towards primary radiation source, the vertical described bottom surface, beam centre direction of the beam that described primary radiation source is penetrated; The bottom surface of described housing has primary filter installing hole; The side of vertical described bottom surface and end face has perforation hole;
Primary filter, is arranged in described primary filter installing hole, and the beam of described primary radiation source injection is by entering described fluorescence generating means after described primary filter filtration;
Elementary diaphragm, after the beam direction of described primary radiation source beam is arranged at described primary filter, carries out limit to the beam after filtering through primary filter and restraints, make the area of described radiation beam be less than the area of radiant body;
Described radiant body, is arranged at the chamfered inside of described truncated rectangular pyramids structure housing; The position of the upright projection of described radiant body in described bottom surface and described primary filter installing hole coincides; Corresponding characteristic ray bundle is inspired through limitting the beam of bundle to be radiated on radiant body; The beam centre direction of described characteristic ray bundle and the beam centre direction of described primary radiation source perpendicular;
Secondary filter, the end face of vertical described housing and bottom surface are arranged within described housing; Described secondary filter absorbs the ray in the intrafascicular specific energy range of described characteristic ray, obtains described radiation quality fluorescent x ray, is penetrated by described perforation hole.
Preferably, the radiation quality fluorescent x ray of described perforation hole injection is received, in order to analyze the composition of described radiation quality fluorescent x ray by the receiver be arranged at outside described perforation hole.
Preferred further, described receiver is specially F1 numbered card.
Preferably, the outer wall of described housing is provided with monitoring means, detects the ray outside by described housing arrival housing, thus the screening ability of described housing is detected.
Preferred further, institute's monitoring means is body lattice cell.
Preferably, described radiant body is GeO
2material is made, and described secondary filter is Ga
2o
3material is made.
Preferred further, described characteristic ray bundle comprises L, K
αand K
βray, the ray in described specific energy range comprises K
βwith L ray.
Preferably, the angle of described inclined-plane and described end face and bottom surface is 45 °.
The fluorescence generating means that the embodiment of the present invention provides, adopts trapezium structure design, reasonably radiant body and secondary filter position distribution maximizedly can utilize material, cost-saving; Compact structure, makes the path minimum of photon, ensure that the maximization of fluorescent yield; Meanwhile, scattering radiation that the outside and therein of device context causes is effectively reduced to K
αthe impact of fluorescence purity.
Accompanying drawing explanation
The generalized section of the fluorescence generating means that Fig. 1 provides for the embodiment of the present invention;
The radiation quality Ge primary fluor fluence spectrogram that Fig. 2 provides for the embodiment of the present invention;
The radiation quality Ge secondary fluor fluence spectrogram that Fig. 3 provides for the embodiment of the present invention.
Embodiment
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Monte Carlo neutron-photon transport program (Monte CarloN-Particle Transport Code, MCNP) is the large-sized multifunction program for the PARTICLE TRANSPORT FROM in calculation of complex three-dimensional geometrical structure that the Monte Carlo group (X-6 group) of U.S. Los Alamos laboratory applications Theoretical Physics portion (X portion) develops.MCNP can be used for the transport issues calculating neutron, photon and neutron-photon coupling, also can calculate the eigenvalue problem of critical system (comprising subcritical and overcritical).
The fluorescence generating means that the embodiment of the present invention provides is the fluorescence generating means model set up based on MCNP program.
The light path transmission structure schematic diagram of the fluorescence generating means that Fig. 1 provides for the embodiment of the present invention.As shown in Figure 1, the fluorescence generating means of the embodiment of the present invention comprises: housing 1, primary filter 2, elementary diaphragm (not shown), radiant body 3 and secondary filter 4.
Housing 1, be truncated rectangular pyramids structure, cross section is right-angled trapezium.
Wherein, the bottom surface 11 of described truncated rectangular pyramids structure housing 1 is arranged towards primary radiation source 5, the beam centre direction vertical bottom face 11 of the beam that primary radiation source 5 is penetrated.
The bottom surface 11 of housing 1 has primary filter installing hole 101; The side 13 of vertical bottom face 11 and end face 12 has perforation hole 102.
Primary filter 2, is arranged in described primary filter installing hole 101.Enter in fluorescence generating means after the beam that primary radiation source 5 penetrates is filtered by primary filter.
Elementary diaphragm, after the beam direction of primary radiation source 5 beam is arranged at primary filter 2, carries out limit to the beam after filtering through primary filter 2 and restraints, make the area of radiation beam be less than 3 areas of radiant body.
Radiant body 3, inside the inclined-plane 14 being arranged at truncated rectangular pyramids structure housing 1; The position of the upright projection of radiant body 3 in bottom surface 11 and primary filter installing hole 101 coincides.
Corresponding characteristic ray bundle is inspired through limitting the beam of bundle to be radiated on radiant body 3.Inclined-plane 14 is all preferably 45 ° with the angle of end face 12 and bottom surface 13, therefore the beam centre direction of characteristic ray bundle and the beam centre direction of primary radiation source 5 perpendicular.
Secondary filter 4, end face 12 and the bottom surface 11 of vertical shell 1 are arranged within housing 1.
Ray in the specific energy range that secondary filter 4 pairs of characteristic rays are intrafascicular absorbs, and obtains radiation quality fluorescent x ray, and is penetrated by perforation hole 102.
Shown in Fig. 1, the beam direction of primary radiation source 5 beam is vertically downward, and the bottom surface 11 of housing 1 and primary filter 2 are all arrange in the horizontal direction, and elementary diaphragm is arranged at the below of primary filter 2.The beam centre direction of characteristic ray bundle be level to the right.The beam centre direction of radiation quality fluorescent x ray be also level to the right.
In order to detect the screening ability of housing, monitoring means can be set on the outer wall of housing 1, detect the ray outside by described housing arrival housing.
In order to analyze the composition of radiation quality fluorescent x ray, receiver 6 can be set outside perforation hole 102, receive the radiation quality fluorescent x ray of injection.
With a concrete example, fluorescence generating means of the present invention is described below.
Primary radiation source selects the unfiltered bremsspectrum of German federal physical technique research institute (PTB) laboratory 60kV as the incident spectrum of simulation.Arrange the body lattice cell of multiple 2cm × 2cm × 2cm as monitoring means at the outer wall of fluorescence generating means housing, its count value is all 0, illustrates that the shield effectiveness of device is good.Receiver adopts F1 numbered card.By the number of photons that F1 numbered card simulation setting area passes, flux is measured.Radiant body selects GeO
2material, secondary filter selects Ga
2o
3material.
Primary filter filters in primary radiation source ray does not have contributive low energy partial photonic to generation fluorescence.Primary filter can raffinal film-making (purity >99.99%), different according to fluorescence excitation energy, thickness is respectively 0.5mm and 1mm, in order to the effect of accurate validation primary filter, by the spectrum of MCNP simulation softward determination primary radiation source through primary filter.
K is mainly contained after the primary radiation source exciting radiation body of primary filter
β, K
α, L ray and X-ray production apparatus high-energy section photon, pass through Ga
2o
3the secondary filter of material effectively can eliminate the K of radiation quality Ge
βphoton, the radiation quality fluorescent x ray obtained is the K that purity is higher
αline.
In order to the clearer effect demonstrating fluorescence generating means of the present invention, adopt F1 numbered card to carry out contrast to radiation quality fluorescent x ray and primary radiation source ray and collect, and by the counting of F1 numbered card mapping process.Fig. 2 is radiation quality Ge primary fluor fluence spectrum, and Fig. 3 is radiation quality Ge secondary fluor fluence spectrum.
Can demonstrate from Fig. 2, unfiltered fluorescence Spectra has four to absorb limit, wherein two fluorescence being copper fluorescent apparatus material and producing, and corresponding energy is 8.0keV, 8.9keV, and two other is the K that radiant body material Ge produces
α, K
βenergy is 9.9keV, 11.0keV respectively, and find the scattering having part in its both sides, this is by K
αand K
βrayleigh scattering and Compton scattering occur and two platforms being formed, and the scattered photon of high-energy section is mainly from the scattering composition of photon in the initial power spectrum of X-ray production apparatus.This part photon proportion in total photon number is less, relative to K
αand K
βcontribute negligible.
As can be seen from Figure 3, Ga
2o
3the secondary filter of material effectively can eliminate the K of radiation quality Ge
βphoton, inhibits device Cu material fluorescence simultaneously, substantially increases K
αfluorescence purity.
The fluorescence generating means that the embodiment of the present invention provides, adopts trapezium structure design, reasonably radiant body and secondary filter position distribution maximizedly can utilize material, cost-saving; Compact structure, makes the path minimum of photon, ensure that the maximization of fluorescent yield; Meanwhile, scattering radiation that the outside and therein of device context causes is effectively reduced to K
αthe impact of fluorescence purity.
Above-described embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only the specific embodiment of the present invention; the protection range be not intended to limit the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a fluorescence generating means, is characterized in that, described fluorescence generating means comprises:
Housing, be truncated rectangular pyramids structure, cross section is right-angled trapezium; Wherein, the bottom surface of described truncated rectangular pyramids structure housing is arranged towards primary radiation source, the vertical described bottom surface, beam centre direction of the beam that described primary radiation source is penetrated; The bottom surface of described housing has primary filter installing hole; The side of vertical described bottom surface and end face has perforation hole;
Primary filter, is arranged in described primary filter installing hole, and the beam of described primary radiation source injection is by entering described fluorescence generating means after described primary filter filtration;
Elementary diaphragm, after the beam direction of described primary radiation source beam is arranged at described primary filter, carries out limit to the beam after filtering through primary filter and restraints, make the area of described radiation beam be less than the area of radiant body;
Described radiant body, is arranged at the chamfered inside of described truncated rectangular pyramids structure housing; The position of the upright projection of described radiant body in described bottom surface and described primary filter installing hole coincides; Corresponding characteristic ray bundle is inspired through limitting the beam of bundle to be radiated on radiant body; The beam centre direction of described characteristic ray bundle and the beam centre direction of described primary radiation source perpendicular;
Secondary filter, the end face of vertical described housing and bottom surface are arranged within described housing; Described secondary filter absorbs the ray in the intrafascicular specific energy range of described characteristic ray, obtains radiation quality fluorescent x ray, and is penetrated by described perforation hole.
2. fluorescence generating means according to claim 1, is characterized in that, the radiation quality fluorescent x ray of described perforation hole injection is received, in order to analyze the composition of described radiation quality fluorescent x ray by the receiver be arranged at outside described perforation hole.
3. fluorescence generating means according to claim 2, is characterized in that, described receiver is specially F1 numbered card.
4. fluorescence generating means according to claim 1, is characterized in that, the outer wall of described housing is provided with monitoring means, detects the ray outside by described housing arrival housing, thus detects the screening ability of described housing.
5. fluorescence generating means according to claim 4, is characterized in that, institute's monitoring means is body lattice cell.
6. fluorescence generating means according to claim 1, is characterized in that, described radiant body is GeO
2material is made, and described secondary filter is Ga
2o
3material is made.
7. fluorescence generating means according to claim 6, is characterized in that, described characteristic ray bundle comprises L, K
αand K
βray, the ray in described specific energy range comprises K
βwith L ray.
8. fluorescence generating means according to claim 1, is characterized in that, the angle of described inclined-plane and described end face and bottom surface is 45 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510388693.0A CN104936367B (en) | 2015-07-03 | 2015-07-03 | Fluorescence generating means |
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|---|---|---|---|
| CN201510388693.0A CN104936367B (en) | 2015-07-03 | 2015-07-03 | Fluorescence generating means |
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| CN104936367B CN104936367B (en) | 2017-12-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2242521Y (en) * | 1995-11-16 | 1996-12-11 | 谭大刚 | Medical X-ray tube of fluorescent-enhancement type |
| CN103731966A (en) * | 2014-01-03 | 2014-04-16 | 中国原子能科学研究院 | Integrated fluorescence generating device |
-
2015
- 2015-07-03 CN CN201510388693.0A patent/CN104936367B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2242521Y (en) * | 1995-11-16 | 1996-12-11 | 谭大刚 | Medical X-ray tube of fluorescent-enhancement type |
| CN103731966A (en) * | 2014-01-03 | 2014-04-16 | 中国原子能科学研究院 | Integrated fluorescence generating device |
Non-Patent Citations (3)
| Title |
|---|
| 万兆勇 等: "K荧光X参考辐射及其照射量测量", 《原子能科学技术》 * |
| 冉启泉: "用于照射量仪校准的宽束K荧光靶", 《四川教育学院学报》 * |
| 陈成 等: "K荧光能谱及荧光产额MC模拟", 《核电子学与探测技术》 * |
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| CN104936367B (en) | 2017-12-19 |
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Granted publication date: 20171219 Termination date: 20180703 |