CN104795301B - X ray target assembly - Google Patents
X ray target assembly Download PDFInfo
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- CN104795301B CN104795301B CN201410383988.4A CN201410383988A CN104795301B CN 104795301 B CN104795301 B CN 104795301B CN 201410383988 A CN201410383988 A CN 201410383988A CN 104795301 B CN104795301 B CN 104795301B
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Abstract
A kind of X ray target assembly, including target, the target have the first surface for receiving high-power electron beam bombardment, and the first surface has by bombardment position；Also include heat-conducting layer, the heat-conducting layer at least covers described to be bonded by bombardment position and with described by bombardment position.Heat-conducting layer cause target by bombardment position and air exclusion, and the heat Quick diffusing by bombardment position is gone out, therefore it can lift the incident power of high-power electron beam while preventing target by bombard position oxidation and surface corrosion, improve x-ray dose rate.
Description
Technical field
The present invention relates to medical instruments field, and in particular to a kind of X ray target assembly.
Background technology
X ray is widely used in modern medical diagnosis and treatment, especially oncotherapy.
In the prior art, high-power electron beam bombardment target, (high energy charged particles are unexpected for generation bremsstrahlung in target
A kind of radiation caused by deceleration) and produce X ray.High-power electron beam typically is accelerated to be formed by accelerator high pressure, and target can be by
Such as the material such as tungsten, gold, thallium, iron, copper, nickel is made.
When high-power electron beam bombards target, it is very low to produce the conversion efficiency of X ray, and generally only 15% or so, high energy electricity
Most of energy of beamlet is all absorbed by target, produces heat.When machine requires bigger (the unit interval generation of the close rate of offer
X-ray dose), then require that the incident power of high-power electron beam is bigger, while it is also more to accumulate in heat on target, if hot
Amount can not be distributed in time, then can cause the thawing of target material surface, puncture when serious, permanent to use, and target material surface is oxidized,
It is deformed, causes the service life of target to reduce, greatly reduces the security of beta ray therapy.Therefore the radiating of target turns into
One urgent problem to be solved.
There is a kind of X ray target assembly (prior art one) in the prior art, as shown in figure 1, target assembly is included exposed to sky
Target 11 (such as tungsten target) in gas and the heat-conducting metal 12 with high thermal conductivity, heat-conducting metal 12 have groove 14, target 11
In groove 14, the lower surface of target 11 is bonded with the bottom of groove 14, upper surface is used for the bombardment that receives high-power electron beam；
In addition, cooling water pipeline 13 is embedded with heat-conducting metal 12.By said structure, heat-conducting metal 12 will can be accumulated under target 11
The heat on surface is rapidly transferred to cooling water pipeline 13, is distributed by the effect of cooling water in cooling water pipeline 13.
The defects of this target assembly, is：One is due to target and air contact, plus target by bombardment spot temperature compared with
Height, the position is caused easily to aoxidize, be easily corroded；Second, the radiating of target is bad, in order to ensure its service life, can only reduce
The incident power of high-power electron beam, to ensure that target assembly is in safe temperature range when in use, this causes the dosage of X ray
Rate is restricted.
There is another X ray target assembly (prior art two) in the prior art, as shown in Fig. 2 this target assembly is existing
On the basis of technology one, target 11 is placed in the vacuum environment Q of accelerator, can so prevent the surface oxidation and table of target
Corrode in face.On the one hand, technique X ray target assembly being installed in vacuum environment is more complicated；On the other hand, the target assembly does not have
Solve the problems, such as to radiate in prior art one bad, cause the target assembly can not be in the high-power incident situation of high-power electron beam
Lower use.
The content of the invention
The present invention provides a kind of new target assembly, can prevent the oxidation and surface corrosion by bombardment position of target
Meanwhile there is preferable radiating efficiency, the x-ray dose rate of target assembly is lifted, and it is simple in construction.
To solve the above problems, the present invention provides a kind of X ray target assembly, including target, the target, which has, receives height
The first surface of energy beam bombardment, the first surface have by bombardment position；Also include heat-conducting layer, the heat-conducting layer is at least
Covering is described to be bonded by bombardment position and with described by bombardment position.
Optionally, the target assembly is fixed target or rotary target.
Optionally, the heat-conducting layer covers the first surface.
Optionally, the thermal conductivity factor of the heat-conducting layer is more than 15W/mK, and the density of the heat-conducting layer is less than 19g/cm3.
Optionally, in addition to radiating part, the target has a second surface opposite with the first surface, and described second
Surface is bonded with the radiating part.
Optionally, the radiating part has groove, and the target and the heat-conducting layer are located in the groove, the heat conduction
Layer is bonded with the side wall of the groove.
Optionally, there is at least one cooling passage in the radiating part.
Optionally, the material of the radiating part is heat-conducting metal.
Optionally, the material of the heat-conducting layer is the material modified of graphite or graphite, or is oxidation resistant metal or conjunction
Gold.
Optionally, the heat-conducting layer includes basal layer and anti oxidation layer, and the basal layer is beryllium, iron, or the modification of beryllium, iron
At least one of material；The basal layer is at least bonded with described by bombardment position, and the anti oxidation layer is located at the basis
Layer with it is described by the opposite side in bombardment position, cover the basal layer and be bonded with the basal layer.
Compared with prior art, technical scheme has advantages below：
Heat-conducting layer is set by bombardment position in target, heat-conducting layer cause target by bombardment position and air exclusion, and
Heat Quick diffusing by bombardment position is gone out, therefore oxidation and surface of the target by bombardment position can prevented
While corrosion, the incident power of high-power electron beam is lifted, improves x-ray dose rate.
Brief description of the drawings
Fig. 1 is a kind of cross-sectional view of X ray target assembly in the prior art；
Fig. 2 is the cross-sectional view of another X ray target assembly in the prior art；
Fig. 3 is the cross-sectional view of X ray target assembly in the embodiment of the present invention one；
Fig. 4 is the structural representation that target is fixed in the embodiment of the present invention one；
Fig. 5 is the structural representation of rotary target material in the embodiment of the present invention one；
Fig. 6 is target assembly figure compared with the beam spot of target assembly in the prior art in the embodiment of the present invention one；
Fig. 7 is the energy spectrum diagram of target assembly and target assembly in the prior art in the embodiment of the present invention one；
Fig. 8 is the side view of heat-conducting layer in the X ray target assembly of the embodiment of the present invention two.
Embodiment
It is understandable to enable the above objects, features and advantages of the present invention to become apparent, below in conjunction with the accompanying drawings to the present invention
Specific embodiment be described in detail.
Embodiment one
The present embodiment provides a kind of X ray target assembly 100, reference picture 3, including target 101, heat-conducting layer 102 and radiating part
103。
With reference to shown in Fig. 4-5, target 101 has the first surface 101a that receives high-power electron beam bombardment and with first
Second surface 101b opposite surface 101a, first surface 101a have is covered first surface by bombardment position A, heat-conducting layer 102
101a is simultaneously bonded with first surface 101a.
Heat-conducting layer 102 is the critical component in the present embodiment structure, in theory for, the selection bar of the material of heat-conducting layer 102
Part is：Thermal conductivity factor is the bigger the better, density is the smaller the better, thickness is the smaller the better.In the present embodiment, the material choosing of heat-conducting layer 102
It is material modified with graphite or graphite.
The material of radiating part 103 is heat-conducting metal, has groove 103a in one surface；Have extremely in radiating part 103
Lack a cooling passage 104, coolant, such as water etc. are filled in cooling passage 104.Target 101 and heat-conducting layer 102 are located at
In groove 103a, the second surface 101b of target 101 is bonded with groove 103a bottom, heat-conducting layer 102 and groove 103a side
Wall is bonded.After heat of the heat-conducting layer 102 on first surface 101a is absorbed, pasted by heat-conducting layer 102 and groove 103a side walls
The position of conjunction, radiating part 103 can be promptly transferred heat to, coolant is then transferred heat to by radiating part 103, most
Distributed eventually by the circulation of coolant.
The capacity of heat transmission of graphite or graphite modified material is very good, and its thermal conductivity has obvious anisotropic, its
The several times or decades of times of the thermal conductivity of crystal bedding angle are perpendicular to along the thermal conductivity of crystal bedding angle, therefore, setting is led
The crystal bedding angle of thermosphere 102 is parallel with the first surface 101a of target, using the above-mentioned property of graphite, will can accumulate in
Quickly conducted to radiating part 103 along the direction parallel to first surface 101a by bombardment position A heat.
Here compared with the heat conductivility of graphite is made simply with the heat conductivility of air.For any conduction material, it is led
Heating rate (heat of conduction in the unit interval) is defined as：
In above formula, the equation left side is thermal conductivity, and κ is thermal conductivity factor, and A is heat-conducting area, and Δ T is temperature difference (i.e. heat conduction thing
When matter acts, to the temperature drop of thermal source formation), x is the thickness of conduction material.The heat conduction system of air in normal conditions
Number is 0.024W/mK, and the thermal conductivity factor of graphite is 151W/mK.Assuming that A is identical with x, when temperature is 600K, graphite edge is brilliant
The thermal conductivity of body bedding angle is 30,000 times of air conduction rate or so up to 892W/mK, so that target 101 is tungsten target as an example,
Cladding thickness is the heat-conducting layer 102 of 0.5mm graphite material on target 101, is computed, when incident electron power is 1000W,
By bombardment position A temperature drop up to 230~260 degrees Celsius.It should be evident that for air, heat-conducting layer 102 has
Have better heat-conducting effect, can effectively reduce first surface 101a heat accumulation, therefore can to target assembly apply compared with
The incident power of high high-power electron beam, improve x-ray dose rate.
Further, since its thermal conductivity perpendicular to first surface 101a directions is low compared with parallel to first surface 101a directions
Some, heat-conducting layer 102 can keep higher thermograde in the direction so that the side opposite with target 101 of heat-conducting layer 102
Surface temperature is relatively low, thereby protects graphite surface, makes it be not readily susceptible to corrode.
Heat-conducting layer 102 also has another effect, exactly completely cuts off target in addition to it can play a part of transmitting heat
101 first surface 101a and air, it can prevent that the first surface 101a of target 101 from being aoxidized and surface corrosion, to target
Material 101 plays a very good protection.Because graphite has an inoxidizability in itself, therefore the heat-conducting layer 102 of graphite material is not yet
Corrosion is oxidized easily, there is longer service life.
Verify the heat-conducting layer of graphite material for the beam spot of electron beam and the influence (density of graphite linings of photons spectrum below
For 2.26g/cm3)。
Heat-conducting layer 102 is calculated using MC algorithms (Marching Cubes, marching cubes algorithm) in the present embodiment
Effect is expanded to beam spot when thickness is 0.5mm.As shown in fig. 6, abscissa represents radius R (unit as cm), ordinate represents
Energy stream (unit Mev/cm2), point-like curve a, solid line shape b represent traditional target assembly design (no heat-conducting layer) and this reality respectively
Apply a beam spot for target assembly design.It will be seen from figure 6 that two curves a, b are essentially coincided, so being shown as one in figure
Curve.That is, influence of the heat-conducting layer 102 to beam spot can be ignored in the present embodiment, for example, using beam in this experiment
Spot is 1mm, and the electron beam that energy is 6Mev is incident, after electron beam passes through heat-conducting layer 102, the beam spot size on the surface of target 101
Still it is 1mm.
Fig. 7 shows influence of the heat-conducting layer 102 to photons spectrum, and wherein abscissa represents energy (unit as Mev), indulges and sits
Mark represents relative intensity, and point-like curve aa represents the photons spectrum of traditional target assembly design (no heat-conducting layer), real line-like curve bb
The photons spectrum that target assembly designs in the present embodiment is represented, as can see from Figure 7, the peak value of two curves essentially coincides, because
This influence of heat-conducting layer 102 to photons spectrum can also be ignored.
As can be seen here, influence of the heat-conducting layer 102 to target assembly performance can be ignored in the present embodiment.
In other embodiments, the thickness of heat-conducting layer can choose other values as needed.
Wherein, target assembly can be fixed target or rotary target.Reference picture 4, when target assembly is fixed target, by bombardment position
A is usually located at the central area of target 101；Reference picture 5, when target assembly is rotary target, a ring is formed by bombardment position A
Shape.
In other embodiments, the area of heat-conducting layer might be less that the area of first surface, but must ensure heat-conducting layer extremely
Few covering is bonded by bombardment position and with by bombardment position；Target and heat-conducting layer can also be directly arranged at the surface of radiating part,
And be not necessarily required to set in a groove, as long as ensureing that heat-conducting layer and radiating part have fitting part；In addition, according to target
Cooling requirements, radiating part can also be not provided with, can now set heat-conducting layer only cover by bombardment position, now by bombardment portion
The heat of position can be dispersed into air by heat-conducting layer.
Embodiment two
The present embodiment and the difference of embodiment one be, reference picture 4-5 and with reference to shown in Fig. 8, and heat-conducting layer 102 is in structure
Including basal layer 102a and anti oxidation layer 102b, basal layer 102a is at least one of material modified of beryllium, iron, or beryllium, iron.
Wherein, basal layer 102a at least with by bombardment position A be bonded, anti oxidation layer 102b be located at basal layer 102a and by bang
Hit the opposite sides of position A, covering basal layer 102a and be bonded with basal layer 102a.
If layer 102a beryllium, the material modified of iron inherently have inoxidizability based on, can save antioxygen
Change layer 102b setting.
In order to reduce influence of the heat-conducting layer 102 to the beam spot and power spectrum of incident beam, heat-conducting layer 102 at least needs full
Foot：The thermal conductivity factor of heat-conducting layer 102 is more than 15W/mK, and density is less than 19g/cm3, and the thickness of heat-conducting layer 102 is according to institute's selection
The density and thermal conductivity factor of material determine.
Although present disclosure is as above, the present invention is not limited to this.Any those skilled in the art, this is not being departed from
In the spirit and scope of invention, it can make various changes or modifications, therefore protection scope of the present invention should be with claim institute
The scope of restriction is defined.
Claims (10)
1. a kind of X ray target assembly, including target, the target has the first surface for receiving high-power electron beam bombardment, described
First surface has by bombardment position；
Characterized in that, also include heat-conducting layer, the heat-conducting layer at least cover it is described by bombardment position and with described by bombardment portion
Position fitting, the heat-conducting layer isolation are described by bombardment position and air；
The heat-conducting layer has inoxidizability.
2. X ray target assembly as claimed in claim 1, it is characterised in that the target assembly is fixed target or rotary target.
3. X ray target assembly as claimed in claim 1, it is characterised in that the heat-conducting layer covers the first surface.
4. the X ray target assembly as described in claim any one of 1-3, it is characterised in that the thermal conductivity factor of the heat-conducting layer is big
In 15W/mK, the density of the heat-conducting layer is less than 19g/cm3。
5. the X ray target assembly as described in claim any one of 1-3, it is characterised in that also including radiating part, the target tool
There is the second surface opposite with the first surface, the second surface is bonded with the radiating part.
6. X ray target assembly as claimed in claim 5, it is characterised in that the radiating part has groove, the target and institute
State heat-conducting layer to be located in the groove, the heat-conducting layer is bonded with the side wall of the groove.
7. X ray target assembly as claimed in claim 5, it is characterised in that there is at least one coolant in the radiating part
Passage.
8. X ray target assembly as claimed in claim 5, it is characterised in that the material of the radiating part is heat-conducting metal.
9. X ray target assembly as claimed in claim 1, it is characterised in that the material of the heat-conducting layer is graphite or graphite
It is material modified.
10. X ray target assembly as claimed in claim 2, it is characterised in that the heat-conducting layer includes basal layer and anti-oxidant
Layer, the basal layer are at least one of material modified of beryllium, iron, or beryllium, iron；
The basal layer is at least bonded with described by bombardment position, and the anti oxidation layer is located at the basal layer and bombarded with described
The opposite side in position, the covering basal layer are simultaneously bonded with the basal layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410383988.4A CN104795301B (en) | 2014-08-06 | 2014-08-06 | X ray target assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410383988.4A CN104795301B (en) | 2014-08-06 | 2014-08-06 | X ray target assembly |
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| CN104795301A CN104795301A (en) | 2015-07-22 |
| CN104795301B true CN104795301B (en) | 2017-11-28 |
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| CN201410383988.4A Active CN104795301B (en) | 2014-08-06 | 2014-08-06 | X ray target assembly |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106474632A (en) * | 2015-08-31 | 2017-03-08 | 上海联影医疗科技有限公司 | X-ray target assembly |
| CN105263251B (en) * | 2015-10-13 | 2018-02-27 | 上海联影医疗科技有限公司 | Target assembly and the linear accelerator including the target assembly |
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|---|---|---|---|---|
| US3867637A (en) * | 1973-09-04 | 1975-02-18 | Raytheon Co | Extended monochromatic x-ray source |
| CN1672635A (en) * | 2004-03-26 | 2005-09-28 | 株式会社岛津制作所 | X-ray generating apparatus |
| CN101582365A (en) * | 2008-05-16 | 2009-11-18 | 通用电气公司 | Apparatus for increasing radiative heat transfer in x-ray tube and method of making the same |
| CN103871807A (en) * | 2012-12-07 | 2014-06-18 | 上海联影医疗科技有限公司 | X-ray tube and preparation method thereof |
| CN204029760U (en) * | 2014-08-06 | 2014-12-17 | 上海联影医疗科技有限公司 | X-ray target assembly |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2652767B1 (en) * | 2010-12-16 | 2017-03-15 | Koninklijke Philips N.V. | Anode disk element with refractory interlayer and vps focal track |
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- 2014-08-06 CN CN201410383988.4A patent/CN104795301B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3867637A (en) * | 1973-09-04 | 1975-02-18 | Raytheon Co | Extended monochromatic x-ray source |
| CN1672635A (en) * | 2004-03-26 | 2005-09-28 | 株式会社岛津制作所 | X-ray generating apparatus |
| CN101582365A (en) * | 2008-05-16 | 2009-11-18 | 通用电气公司 | Apparatus for increasing radiative heat transfer in x-ray tube and method of making the same |
| CN103871807A (en) * | 2012-12-07 | 2014-06-18 | 上海联影医疗科技有限公司 | X-ray tube and preparation method thereof |
| CN204029760U (en) * | 2014-08-06 | 2014-12-17 | 上海联影医疗科技有限公司 | X-ray target assembly |
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| CN104795301A (en) | 2015-07-22 |
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Address after: 201815 Shanghai City, Jiading District Jiading Industrial Zone No. 1180 Building 8 Hing Road Patentee after: Shanghai Lianying Medical Technology Co., Ltd Address before: 201815 Shanghai City, Jiading District Jiading Industrial Zone No. 1180 Building 8 Hing Road Patentee before: SHANGHAI UNITED IMAGING HEALTHCARE Co.,Ltd. |
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Address after: 201807 2258 Chengbei Road, Jiading District, Shanghai Patentee after: Shanghai Lianying Medical Technology Co.,Ltd. Address before: 201815 No. 1180 Xingxian Road, Jiading Industrial Zone, Jiading District, Shanghai Patentee before: Shanghai Lianying Medical Technology Co.,Ltd. |