US3670395A - Method of making a honeycomb block collimator - Google Patents
Method of making a honeycomb block collimator Download PDFInfo
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- US3670395A US3670395A US73573A US3670395DA US3670395A US 3670395 A US3670395 A US 3670395A US 73573 A US73573 A US 73573A US 3670395D A US3670395D A US 3670395DA US 3670395 A US3670395 A US 3670395A
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- coil members
- honeycomb block
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21K—TECHNIQUES FOR HANDLING PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES
- G21K1/00—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating
- G21K1/02—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating using diaphragms, collimators
- G21K1/025—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating using diaphragms, collimators using multiple collimators, e.g. Bucky screens; other devices for eliminating undesired or dispersed radiation
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
- G21F1/00—Shielding characterised by the composition of the materials
- G21F1/02—Selection of uniform shielding materials
- G21F1/08—Metals; Alloys; Cermets, i.e. sintered mixtures of ceramics and metals
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
- G21F3/00—Shielding characterised by its physical form, e.g. granules, or shape of the material
Definitions
- a fi fi Data A honeycomb block is made by winding a tungsten metal wire compactly around a core and then removing the core, thereby commuatlon'mpafl of 5611 1 p fabricating a compactly wound coil member.
- the coil mem- 1970 abandonedbers are arranged side by side and are bonded together with a 7 metal paste bonding agent to form the honeycomb block.
- This invention relates to honeycomb blocks, and more particularly to a method of making a honeycomb block for X-ray use.
- X-rays generated by the source or dif fused radiations such as gamma rays emitted from the Co after being focused by a collimator.
- This collimator is in the form of a honeycomb block prepared by laminating a plurality of thin plates having a large number of apertures therein. Since these numerous apertures are arranged in registration with each other, the incoming radiations are allowed to pass through them in such a manner that they are collimated only within a specified range on the outlet side.
- honeycomb block used in photographing the human body by means of X-rays.
- the thin plates forming the honeycomb block were made of materials capable of readily absorbing X-rays, namely, high density materials. These materials generally consisted of lead, gold, platinum, molybdenum, tungsten and tungsten alloys.
- the fabrication of the honeycomb block from the aforementioned thin plates required the steps of drilling a large number of apertures in the plates and laminating these perforated plates.
- the perforation of the thin plates was a difficult operation because the drilling of a large number of apertures through hard and yet brittle materials such as tungsten reduced the life of a drilling tool and required long hours of work.
- the present invention is intended to provide a large number of apertures not by perforating a thin plate, but by compactly coiling metal wire made of, for example, molybdenum or tungsten into a tubularform, and bonding these compactly wound coil members close to each other, thereby fabricating a honeycomb-like multi-hole block.
- the aforementioned tubular compactly wound coil member is fabricated by closely coiling wires around a core and thereafter withdrawing the core from the coil. Thus, the adjacent wire turns are intimately attached to each other.
- the shape of the aperture or inner hollow space of the compactly wound coil member may be not only circular, but also may take any desired polygonal form, for example, a triangle, square, rectangle or hexagon according to the shape of the core used.
- the word tubular is used herein to denote any of these various shapes.
- the hollow space assumes any of the latter forms, for example, a square or rectangle, the compactly would coil members will have increased contact areas when arranged together, thus enabling the honeycomb block composed of such members to have a greater assembled strength.
- the metal wire itself used in forming a compactly wound coil member has a polygonal, for example, a rectangular cross section rather than a circular one, namely, a ribbon-like form, there will be obtained larger contact areas between the wire turns, thus improving the mechanical strength of the compactly wound coil member.
- a metal paste bonding agent such as copper paste, silver paste, copper alloy paste or silver alloy paste.
- copper alloy pastes for example, there are Cu-Zn pastes, and among silver alloy pastes, there are Ag-Zn-Cu pastes.
- a metal paste is prepared by mixing together the metal powders and an organic solvent such as butyl acetate, vinyl acetate, and amyl acetate in the proportion of l-2:l by weight.
- the apertures of a honeycomb block used as a radiation collimator are preferably arranged in a linear direction.
- the compactly wound coil members are purposely deformed and assembled by the use of a metal paste bonding agent into any desired type of honeycomb block so as to have a nonlinear aperture arrangement.
- the honeycomb block prepared according to the present invention allows the apertures for passing radiations to have any desired cross sectional shape. Furthermore, all of the apertures will have a uniform dimensional precision and the honeycomb block as a whole will have precisely positioned apertures free from any distortion.
- the honeycomb block of the present invention eliminates the necessity of drilling apertures in a thin plate. Since the only requirement is to wind'wiring about a core,there is the advantage that manufacturing process will become much easier even if wiring consists of materials such as tungsten which normally present difliculties in machining. Moreover, the crosswise and lengthwise intervals between the apertures can be reduced to about 40 to 60 microns, thus substantially increasing the radiation collimating capacity of the honeycomb block of the present invention over the prior art apparatus.
- FIG. 1 is a perspective of a honeycomb block according to an embodiment of the present invention
- FIG. 2 is a perspective of an enlarged part of the honeycomb block'of FIG. 1, showing details of the compactly coiledwire turns;
- FIG. 3 is a perspective of assembled compactly wound coil members whose aperture or interior hollow space as well as the cross section of the component wire is of a different shape from those of FIG. 2.
- numeral 1 represents a substantially tubular compactly woundcoil member prepared by winding a tungsten wire having a circular cross section so as to form a circular aperture, the adjacent wire turns being arranged intimately close to each other.
- the compactly wound coil member is prepared by heating a tungsten wire having a circular cross section 0.2mm in diameter to about 800 C to soften it and winding it about a molybdenum core (not shown) in a manner to cause the adjacent wire turns to be wound intimately close to each other.
- the core is withdrawn to obtain a compactly wound coil member having an aperture diameter of 3.1 mm and an outer diameter of 3.5 mm.
- a metal paste bonding agent 3 is filled into the gaps between the respective compactly wound oil members 1.
- the bonding agents consists of a copper paste comprising electrolytic copper powders and a butyl acetate solution mixed, 1:1 by weight.
- the honeycomb block fonned from the coil members thus assembled is heated to a temperature of l,l50 to 1,200 C in a hydrogen atmosphere for 30 minutes.
- the copper component included in the bonding agent is thermally melted to be carried into all the interstices between the respective coil members 1 and upon cooling, firmly bonds them together, thus integrally fabricating a honeycomb block 2.
- the coil material consists of a molybdenum wire having a cross section 1 mm X 0.2 mm as shown in FIG. 3.
- the wire is compactly wound at nonnal room temperatures about a molybdenum core having a cross section 3.0 mm X 3.0 mm to a length of 20 mm.
- the core is drawn out to obtain a compactly wound coil member 4 having an aperture 3.1 mm X 3.1 mm and an external size 3.5 mm X 3.5 mm.
- a solution of a bonding agent 5 comprising electrolytic copper powders and a vinyl acetate solution, mixed 1:1 by weight.
- EXAMPLE 3 Compactly wound coil members are formed from tungsten wire as described in Example 1, and these coil members are then piled in a rectangular form, also as described in Example 1.
- a metal paste comprising silver powders and a butyl acetate solution, mixed 1:1 by weight, is filled into the gaps between respective coil members.
- the assembly is then heated to a temperature of l, ll ,150 C in a hydrogen atmosphere for 20 minutes. Thereafter, upon cooling, the silver component in the metal paste firmly bonds the coils together, thus integrally fabricating a honeycomb block.
- the use of the silver paste permits the fabrication of the honeycomb block to be effected at a lower temperature than in the case of a copper paste. Also, a shorter heating period is required.
- EXAMPLE 4 Compactly wound coil members are formed from tungsten wire as described in Example 1, and these coil members are then piled in a rectangular form, also as described in Example 1.
- a metal paste comprising copper alloy powders of 65% Bu and 35% Zn (by weight) and a butyl acetate solution, the copper alloy powders and butyl acetate solution being mixed l:l by weight, is filled into the gaps between respective coil members.
- the assembly is then heated to a temperature of 950-1,000 C in a hydrogen atmosphere for 20 minutes. Thereafter, upon cooling, the silver component in the metal paste firmly bonds the coils together, thus integrally fabricating a honeycomb block.
- EXAMPLE 5 Compactly wound rectangularly shaped coil members are formed from molybdenum wire as described in Example 2, and these coil members are then piled in a rectangular form, also as described in Example 2.
- a silver alloy paste comprising silver alloy powders of 45% Ag, 25% Zn and 30% Cu (by weight) and an amyl acetate solution, the silver alloy powders and amyl acetate solution being mixed 1:1 by weight, is applied to the assembly, also as in Example 2.
- the assembly is then heated to a temperature of 800-900 C in a hydrogen atmosphere for 20 minutes. Thereafter, upon cooling, the silver alloy components in the metal paste firmly bonds the boils together, thus integrally fabricating a honeycomb block.
- a method of making a honeycomb block used for collimation of electro-magnetic radiations in the frequency range of X-rays and gamma-rays comprising the steps of:
- said metal paste comprising powders of metal selected from the group consisting of copper, silver, copper alloy and silver alloy;
- each coil member is wound to have a polygonal aperture.
- each coil member is wound to have a round aperture.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
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- Metallurgy (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Powder Metallurgy (AREA)
Abstract
A honeycomb block is made by winding a tungsten metal wire compactly around a core and then removing the core, thereby fabricating a compactly wound coil member. The coil members are arranged side by side and are bonded together with a metal paste bonding agent to form the honeycomb block.
Description
United States Patent Abe et al. 1 June 20, 1972 [54] METHOD OF MAKING A HONEYCOMB 581 Field ofSearch ..29/4s5, 471.1, 472.3; 250/105, BLOCK COLLIMATOR 250/71.5 R, 71.5 s
[72] Inventors: Isarnu Abe, Kawasaki; Hideo Yashiro, [56] References Cited Tokyo; Naoyuki Sori, Tokyo; Sotaro Hatano, Tokyo; Tomiyasu Katsumoto, UNITED STATES PATENTS T k T S ki, I k I s awa a1 3,407,300 10/1968 Hansen ..250/105 3,543,384 12/1970 Hansen ..250/105 X [73] Assignee: Tokyo Shibaura Electric Co., Ltd.,
Kawasaki-shi, Japan Primary Examiner-Anthony L. Birch [22] Filed: Sept. 18, 1970 Attorney-Flynn & Fr1shauf [21] Appl. No.: 73,573 [57] ABSTRACT Related s A fi fi Data A honeycomb block is made by winding a tungsten metal wire compactly around a core and then removing the core, thereby commuatlon'mpafl of 5611 1 p fabricating a compactly wound coil member. The coil mem- 1970 abandonedbers are arranged side by side and are bonded together with a 7 metal paste bonding agent to form the honeycomb block. [52] US. Cl ..29/47l.l, 250/105 [51] Int. Cl. ..G2lf 5/02, HOlj 35/16 10 Claims, 3 Drawing Figures P'A'TENIEDauuzo m2 v f lama 485. m Mil/0, Mm var! 50 ran MIT/M9,
By TIMIYAWA'IIWWM Tam $02047, INVENTORS 'flyk. 4
1 METHOD OF MAKING A HONEYCOMB BLOCK COLLIMATOR I I This is a continuation-in-part ofapplication Ser. No. 726,041, filed May 2, 1968, now abandoned.
This invention relates to honeycomb blocks, and more particularly to a method of making a honeycomb block for X-ray use.
Where medical treatment is conducted by photographing the interior of the human body using X-rays, or radiating said interior using a C source it is common practice to apply to the human body the X-rays generated by the source or dif fused radiations such as gamma rays emitted from the Co after being focused by a collimator. This collimator is in the form of a honeycomb block prepared by laminating a plurality of thin plates having a large number of apertures therein. Since these numerous apertures are arranged in registration with each other, the incoming radiations are allowed to pass through them in such a manner that they are collimated only within a specified range on the outlet side.
For convenience in description, there will now'be described a prior art collimator or honeycomb block used in photographing the human body by means of X-rays. The thin plates forming the honeycomb block were made of materials capable of readily absorbing X-rays, namely, high density materials. These materials generally consisted of lead, gold, platinum, molybdenum, tungsten and tungsten alloys. The fabrication of the honeycomb block from the aforementioned thin plates required the steps of drilling a large number of apertures in the plates and laminating these perforated plates. The perforation of the thin plates was a difficult operation because the drilling of a large number of apertures through hard and yet brittle materials such as tungsten reduced the life of a drilling tool and required long hours of work. Conversely where apertures were perforated at close intervals in thin plates made of soft materials such as'lead and gold, the portions of the plate between the apertures were often subject to deformation. Consequently there was the drawback that high precision could not be obtained for the apertures. Further for this reason, there were limits to the extent of reducing the aperture intervals of the honeycomb block, namely, the thickness of the portions of the plate intervening between the apertures in order to elevate the passage of X-rays.
SUMMARY OF THE INVENTION The present invention is intended to provide a large number of apertures not by perforating a thin plate, but by compactly coiling metal wire made of, for example, molybdenum or tungsten into a tubularform, and bonding these compactly wound coil members close to each other, thereby fabricating a honeycomb-like multi-hole block. The aforementioned tubular compactly wound coil member is fabricated by closely coiling wires around a core and thereafter withdrawing the core from the coil. Thus, the adjacent wire turns are intimately attached to each other. It will be apparent that in this case, the shape of the aperture or inner hollow space of the compactly wound coil member may be not only circular, but also may take any desired polygonal form, for example, a triangle, square, rectangle or hexagon according to the shape of the core used. The word tubular is used herein to denote any of these various shapes. Where the hollow space assumes any of the latter forms, for example, a square or rectangle, the compactly would coil members will have increased contact areas when arranged together, thus enabling the honeycomb block composed of such members to have a greater assembled strength.
Also where the metal wire itself used in forming a compactly wound coil member has a polygonal, for example, a rectangular cross section rather than a circular one, namely, a ribbon-like form, there will be obtained larger contact areas between the wire turns, thus improving the mechanical strength of the compactly wound coil member.
To integrate a plurality of compactly wound coil members into a honeycomb block by close attachment side by side, there is used a metal paste bonding agent, such as copper paste, silver paste, copper alloy paste or silver alloy paste. Among copper alloy pastes, for example, there are Cu-Zn pastes, and among silver alloy pastes, there are Ag-Zn-Cu pastes. A metal paste is prepared by mixing together the metal powders and an organic solvent such as butyl acetate, vinyl acetate, and amyl acetate in the proportion of l-2:l by weight.
The apertures of a honeycomb block used as a radiation collimator are preferably arranged in a linear direction. However, where these apertures must have a nonlinear arrangement for use in other applications, the compactly wound coil members are purposely deformed and assembled by the use of a metal paste bonding agent into any desired type of honeycomb block so as to have a nonlinear aperture arrangement.
The honeycomb block prepared according to the present invention allows the apertures for passing radiations to have any desired cross sectional shape. Furthermore, all of the apertures will have a uniform dimensional precision and the honeycomb block as a whole will have precisely positioned apertures free from any distortion.
Referring to fabricating problems, the honeycomb block of the present invention eliminates the necessity of drilling apertures in a thin plate. Since the only requirement is to wind'wiring about a core,there is the advantage that manufacturing process will become much easier even if wiring consists of materials such as tungsten which normally present difliculties in machining. Moreover, the crosswise and lengthwise intervals between the apertures can be reduced to about 40 to 60 microns, thus substantially increasing the radiation collimating capacity of the honeycomb block of the present invention over the prior art apparatus.
There will now be described the present invention by reference to the appended drawing in which:
FIG. 1 is a perspective of a honeycomb block according to an embodiment of the present invention;
FIG. 2 is a perspective of an enlarged part of the honeycomb block'of FIG. 1, showing details of the compactly coiledwire turns; and
FIG. 3 is a perspective of assembled compactly wound coil members whose aperture or interior hollow space as well as the cross section of the component wire is of a different shape from those of FIG. 2.
EXAMPLE 1 Referring to FIG. 2, numeral 1 represents a substantially tubular compactly woundcoil member prepared by winding a tungsten wire having a circular cross section so as to form a circular aperture, the adjacent wire turns being arranged intimately close to each other. The compactly wound coil member is prepared by heating a tungsten wire having a circular cross section 0.2mm in diameter to about 800 C to soften it and winding it about a molybdenum core (not shown) in a manner to cause the adjacent wire turns to be wound intimately close to each other. When the coil is wound to a length of 20 mm the core is withdrawn to obtain a compactly wound coil member having an aperture diameter of 3.1 mm and an outer diameter of 3.5 mm.
Next there are piled in a rectangular form a large number of compactly wound coil members thus prepared in such a manner that the adjacent apertures are set apart approximately 3.5 mm from center to center, thereby to form as shown in FIG. 1 a honeycomb block mm on each side and 20 mm in depth. In this case, as illustrated in FIG. 2, a metal paste bonding agent 3 is filled into the gaps between the respective compactly wound oil members 1. The bonding agents consists of a copper paste comprising electrolytic copper powders and a butyl acetate solution mixed, 1:1 by weight. The honeycomb block fonned from the coil members thus assembled is heated to a temperature of l,l50 to 1,200 C in a hydrogen atmosphere for 30 minutes. The copper component included in the bonding agent is thermally melted to be carried into all the interstices between the respective coil members 1 and upon cooling, firmly bonds them together, thus integrally fabricating a honeycomb block 2.
EXAMPLE 2 The coil material consists of a molybdenum wire having a cross section 1 mm X 0.2 mm as shown in FIG. 3. The wire is compactly wound at nonnal room temperatures about a molybdenum core having a cross section 3.0 mm X 3.0 mm to a length of 20 mm. After completion of coiling, the core is drawn out to obtain a compactly wound coil member 4 having an aperture 3.1 mm X 3.1 mm and an external size 3.5 mm X 3.5 mm. Thereafter, over the circumferential surface of the compactly wound coil member thus formed is sprayed a solution of a bonding agent 5 comprising electrolytic copper powders and a vinyl acetate solution, mixed 1:1 by weight. After evaporation of the solvent, there are piled a large number of compactly wound coil members 4 in a rectangular form. These coil members are heated to a temperature of 1,l50 to 1,200 C for 30 minutes and are bonded together by the molten copper. Upon cooling, there is obtained a honeycomb block of approximately the same overall shape as that shown in FIG. 1.
EXAMPLE 3 Compactly wound coil members are formed from tungsten wire as described in Example 1, and these coil members are then piled in a rectangular form, also as described in Example 1. In this case, a metal paste comprising silver powders and a butyl acetate solution, mixed 1:1 by weight, is filled into the gaps between respective coil members. The assembly is then heated to a temperature of l, ll ,150 C in a hydrogen atmosphere for 20 minutes. Thereafter, upon cooling, the silver component in the metal paste firmly bonds the coils together, thus integrally fabricating a honeycomb block. The use of the silver paste permits the fabrication of the honeycomb block to be effected at a lower temperature than in the case of a copper paste. Also, a shorter heating period is required.
EXAMPLE 4 Compactly wound coil members are formed from tungsten wire as described in Example 1, and these coil members are then piled in a rectangular form, also as described in Example 1. In this case, a metal paste comprising copper alloy powders of 65% Bu and 35% Zn (by weight) and a butyl acetate solution, the copper alloy powders and butyl acetate solution being mixed l:l by weight, is filled into the gaps between respective coil members. The assembly is then heated to a temperature of 950-1,000 C in a hydrogen atmosphere for 20 minutes. Thereafter, upon cooling, the silver component in the metal paste firmly bonds the coils together, thus integrally fabricating a honeycomb block.
EXAMPLE 5 Compactly wound rectangularly shaped coil members are formed from molybdenum wire as described in Example 2, and these coil members are then piled in a rectangular form, also as described in Example 2. In this case, a silver alloy paste comprising silver alloy powders of 45% Ag, 25% Zn and 30% Cu (by weight) and an amyl acetate solution, the silver alloy powders and amyl acetate solution being mixed 1:1 by weight, is applied to the assembly, also as in Example 2. The assembly is then heated to a temperature of 800-900 C in a hydrogen atmosphere for 20 minutes. Thereafter, upon cooling, the silver alloy components in the metal paste firmly bonds the boils together, thus integrally fabricating a honeycomb block.
Generally, there is a tendency for tungsten and molybdenum not to become intimately bonded to the other metal. However, it has been found that by using a metal paste of copper or silver alloy, this tendency not to bond is more easily overcome and the bonding operation can be effected at even lower temperatures.
While the invention has been described in connection with some preferred embodiments thereof, the invention is not limited thereto and includes any modifications and alterations which fall within the scope of the invention as defined in the appended claims.
We claim:
1. A method of making a honeycomb block used for collimation of electro-magnetic radiations in the frequency range of X-rays and gamma-rays comprising the steps of:
fabricating a number of coil members, each being fabricated by:
winding around a core with a high density metal wire selected from the group consisting of tungsten and molybdenum; and
thereafter drawing out said core to form a compactly wound coil member; and
firmly bonding together a plurality of said coil members side by side to thereby fabricate a honeycomb block by:
assembling a plurality of coil members in a predetermined arrangement;
filling a metal paste as a bonding agent among said plurality of coil members, said metal paste comprising powders of metal selected from the group consisting of copper, silver, copper alloy and silver alloy; and
heating the resultant assembly of coil members at a temperature of from 800l,200 C in a hydrogen atmosphere.
2. A method according to claim 1 wherein said metal wire is tungsten and further comprising the step of heating said tungsten wire to approximately 800 C prior to the winding step.
3. A method according to claim 1 wherein said assembling step is carried out prior to filling said metal paste among said plurality of coil members, and said heating step is thereafter carried out.
4. A method according to claim 3 wherein said metal wire is tungsten.
5. A method according to claim 1 wherein said metal paste is sprayed on said plurality of coil members prior to assembling same, and said heating step is thereafter carried out.
6. A method according to claim 5 wherein said metal wire is molybdenum.
7. A method according to claim 1 wherein said metal wire has a substantially circular cross section.
8. A method according to claim 1 wherein said metal wire has a substantially rectangular cross section.
9. A method according to claim 1 wherein each coil member is wound to have a polygonal aperture.
10. A method according to claim 1 wherein each coil member is wound to have a round aperture.
+22%? UNITED STATES PATENT OFFICE v CERTIFICATE 0F CORRECTION Patent NO. 3,670,395 Dated June 20-, 1972 I v fl Isamu ABE et al It is certified that error appears inv the above-identified patent and that said Lettere Patent are hereby corrected as shown below:
- [30] Foreign Application Priority Data May 9, l967'Japan.......; ..28893/67--'-'.
Signed and sealed this 51th day ofv December 1972.-
(SEAL) Attest:
EDWARD M.FLETCHER,JR; ROBERT GOTTSCHALK Attesting. Offioer v Commissioner of Patents
Claims (10)
1. A method of making a honeycomb block used for collimation of electro-magnetic radiations in the frequency range of X-rays and gamma-rays comprising the steps of: fabricating a number of coil members, each being fabricated by: winding around a core with a high density metal wire selected from the group consisting of tungsten and molybdenum; and thereafter drawing out said core to form a compactly wound coil member; and firmly bonding together a plurality of said coil members side by side to thereby fabricate a honeycomb block by: assembling a plurality of coil members in a predetermined arrangement; filling a metal paste as a bonding agent among said plurality of coil members, said metal paste comprising powders of metal selected from the group consisting of copper, silver, copper alloy and silver alloy; and heating the resultant assembly of coil members at a temperature of from 800*-1,200* C in a hydrogen atmosphere.
2. A method according to claim 1 wherein said metal wire is tungsten and further comprising the step of heating said tungsten wire to approximately 800* C prior to the winding step.
3. A method according to claim 1 wherein said assembling step is carried out prior to filling said metal paste among said plurality of coil members, and said heating step is thereafter carried out.
4. A method according to claim 3 wherein said metal wire is tungsten.
5. A method according to claim 1 wherein said metal paste is sprayed on said plurality of coil members prior to assembling same, and said heating step is thereafter carried out.
6. A method according to claim 5 wherein said metal wire is molybdenum.
7. A method according to claim 1 wherein said metal wire has a substantially circular cross section.
8. A method according to claim 1 wherein said metal wire has a substantially rectangular cross section.
9. A method according to claim 1 wherein each coil member is wound to have a polygonal aperture.
10. A method according to claim 1 wherein each coil member is wound to have a round aperture.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US7357370A | 1970-09-18 | 1970-09-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3670395A true US3670395A (en) | 1972-06-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US73573A Expired - Lifetime US3670395A (en) | 1970-09-18 | 1970-09-18 | Method of making a honeycomb block collimator |
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| Country | Link |
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| US (1) | US3670395A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0035670B1 (en) * | 1980-03-08 | 1984-03-14 | TRANSNUKLEAR GmbH | Container for radioactive substances |
| US5903004A (en) * | 1994-11-25 | 1999-05-11 | Hitachi, Ltd. | Energy dispersive X-ray analyzer |
| US6127688A (en) * | 1997-02-07 | 2000-10-03 | The University Of Miami | Iso-energetic intensity modulator for therapeutic electron beams, electron beam wedge and flattening filters |
| US20070210259A1 (en) * | 2006-03-08 | 2007-09-13 | Kerwin David B | Cross-talk and back side shielding in a front side illuminated photo detector diode array |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3407300A (en) * | 1966-04-14 | 1968-10-22 | Picker Corp | Collimator and method of making same |
| US3543384A (en) * | 1966-11-14 | 1970-12-01 | Picker Corp | Methods of collimator fabrication |
-
1970
- 1970-09-18 US US73573A patent/US3670395A/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3407300A (en) * | 1966-04-14 | 1968-10-22 | Picker Corp | Collimator and method of making same |
| US3543384A (en) * | 1966-11-14 | 1970-12-01 | Picker Corp | Methods of collimator fabrication |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0035670B1 (en) * | 1980-03-08 | 1984-03-14 | TRANSNUKLEAR GmbH | Container for radioactive substances |
| US5903004A (en) * | 1994-11-25 | 1999-05-11 | Hitachi, Ltd. | Energy dispersive X-ray analyzer |
| US6127688A (en) * | 1997-02-07 | 2000-10-03 | The University Of Miami | Iso-energetic intensity modulator for therapeutic electron beams, electron beam wedge and flattening filters |
| US20070210259A1 (en) * | 2006-03-08 | 2007-09-13 | Kerwin David B | Cross-talk and back side shielding in a front side illuminated photo detector diode array |
| US7544947B2 (en) * | 2006-03-08 | 2009-06-09 | Aeroflex Colorado Springs Inc. | Cross-talk and back side shielding in a front side illuminated photo detector diode array |
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