WO1990009667A1 - Dispositif d'irradiation et lentille - Google Patents

Dispositif d'irradiation et lentille Download PDF

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Publication number
WO1990009667A1
WO1990009667A1 PCT/SE1990/000085 SE9000085W WO9009667A1 WO 1990009667 A1 WO1990009667 A1 WO 1990009667A1 SE 9000085 W SE9000085 W SE 9000085W WO 9009667 A1 WO9009667 A1 WO 9009667A1
Authority
WO
WIPO (PCT)
Prior art keywords
lense
ray
magnetic
magnets
permanent magnets
Prior art date
Application number
PCT/SE1990/000085
Other languages
English (en)
Inventor
Bengt Anderberg
Original Assignee
Scanditronix Ab
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Scanditronix Ab filed Critical Scanditronix Ab
Publication of WO1990009667A1 publication Critical patent/WO1990009667A1/fr

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Classifications

    • 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
    • G21K5/00—Irradiation devices
    • G21K5/10—Irradiation devices with provision for relative movement of beam source and object to be irradiated

Definitions

  • the present invention is rel ted to irradiation of objects, more particurlary electrone irradiation, as for sterilizing medical equipment.
  • a possible way is to arrange in such a way that an object is transported through an electron ray.
  • This electron ray scans the object laterally, that is in a direction perpendicular the direction of movement of said object.
  • the scanning movement is repeated periodically in such way that said object in all its mass is subjected to the influence of the electron ray.
  • the electron ray then scans an area in space having a fan-like shape.
  • Such a desired deflection is provided according to the invention.
  • a correcting lense or parallelizing lense as above is provided which is located preferably close to the object to be irradiated.
  • This correcting lense has a linearly deflecting characteristic on both sides of the undeflected position of the ray, that is the deflection is such that the magnitude of the deflection with a sign is essentially proportional to the distance from the deflecting point in the lense and the center point of that lenses.
  • the paths of the electron ray after traversing this lense will be essentially parallel or convergent contrary to the divergent or fanshaped paths obtained without the lense.
  • This known irradiating device also appears to be limited to irradiating widths of about 10 cm because the parallelizing lense generates a powerful magnetic field which heavily would disturb the particle paths and the operation of other components included in the system for guiding the particle ray. Possibly this could be prevented by the use of heavy shealding or by designing the system with particle paths of sufficient length, but these solutions are naturally disadvantageous.
  • a scanning width is used which is significantly larger, for instance in the order of magnitude of 80 cm and generally at least 30 cm.
  • the magnetic lense which is used according to the invention' may for instance be a conventionel quadrupole magnet.
  • a magnet is however space consuming for the large sweeping widths for which this Invention primarily is intended to be used, and for electrical operation 1 such " a magnet also contains electrically isolating material which can be influenced in a unfavourable way by the radiation.
  • Quadrupole magnets are naturally well known for shaping the section of a particle ray, also scanning rays, see the patent specification US 4075488.
  • the magnetic lense comprises two elongated magnets. These are magnetized in their longitudinal direction and they are placed parallel! to each other at a small distance and further they have opposite directions of magnetization.
  • the electrically charged particle stream is intended to pass through the gap formed between the magnets. Ely appropriately adjusting the distance between the magnets such a magnetic field intensity is obtained and thus a deflecting influence on the electron rays passing therebetween can be obtainer that the paths of the electron rays can be made more or less parallel after the passage.
  • the elongated magnets can be constructed as electrical magnets having essentially equally distributed winding turns over the length of the magnetic core. Electrical operation of the elongated magnets"included in the magnetic lense however can be unsuitable because of the risk of radiation damages mentioned above. Thus it is preferred that that these magnets are made permanent.
  • the permanent magnets are formed by packages of primary magnets and that these primary magnets are separated by a material having a high susceptibility such as transformer core sheets.
  • the primary magnets in a package all are magnetized in the same direction and by varying a little the mutual distance between these primary magnets also the desired adjustment of the resulting magnetic field can be obtained.
  • an irradiation method is achieved such that a beam of electrically charged particles is moved with mutually parallel paths in a plane over an object without the requirement that said object has to move, that is it can be standing still or displaced with a constant velocity in a displacement direction perpendicular to the plane containing the electron rays.
  • the parallel displacement movement of the electron ray is repeated, possibly in the opposite direction.
  • FIG. 1 schematically illustrates a prior art installation for sterilizing medical equipment
  • Fig. 2 schematically illustrates the installation according to the invention seen from the side
  • Fig. 3 is a side view of the magnetic lense mounted beneath a flange
  • Fig. 4 is an end view of the magnetic lense with retainers mounted beneath the outlet chamber of the electron ray
  • Fig. 5 is a schematical view seen from above of the magnetic lense.
  • an installation is shown for sterilizing objects such as cases 1 containing medical equipment. This may for instance have a largest dimension of 10 - 80 cm. They pass on a conveyor belt 3 above an irradiation device 5.
  • the objects 1 are subjected to an electron ray which fanlike and repeatedly scans the article while the article is transported forward perpendicularly to the plane of the fan shape.
  • Fig. 2 the installation according to the invention is schematically illustrated, wherein it must be observed that the scanning direction of the electron ray here is perpendicular to the one illustrated in Fig. 1.
  • the irradiation installation 5' consists of an electron gun which, as in the conventional way, consists of an electron source 7, a linear accelerator having several steps 9, focusing and direction changing lenses 11 and 13 respectively.
  • the electron ray which altogether passes in a vacuum exits upwardly and is deflected periodically by a lense 15 providing the scanning movement. In this part the electron ray is enclosed in a vacuum chamber 17 having a triangular configuration.
  • This triangular chamber 17 is terminated at its upper part by a upper flange 19 having a thin window, through which the electron ray exits and will pass through an object to be irradiated.
  • a lense 21 Before the electron ray exits from the vacuum chamber 17 it has been reflected by a lense 21. This results in the fact that the electron ray issued always is approximately parallel to the center ray, that is to the ray which is not deflected by means of the scanning lense 15.
  • the magnetic lense 21 is constructed in such a way that it will provide an angular deflection of the electron ray which is proportionel to the distance between the passage of the central ray through the lense 21 and the deflection point of the electron ray considered inside the lense 21. By making this deflection larger or smaller various diverging, parallel! or convergent ray paths can be obtained.
  • Fig. 5 is illustrated schematically seen from above how the magnetic lense 21 used is constructed. It consists of two permanent magnets 23 having a generally elongated shape and placed adjacent to each other in such a way that a gap is formed. Through this gap the electron ray is intended to pass.
  • the two permanent magnets 23 are magnetized in their longitudinal direction, they are located in parallel to each other and at an adjustable distance from each other. The magnetizing direction of the magnets 23 are opposite. In the gap between these magnets 23 a magnetic field is formed which is the appropriate deflecting type.
  • each magnet 23 further is constructed as a pac age of primary magnets 25 and softmagnetical material 23 located therebetween.
  • the primary magnets 25 may be designed as plates, for instance having a square shape, and then they are magnetized perpendicularly to the large surfaces of the plate.
  • the primary magnets 25 are in addition distributed essentially with an equal spacing over the length of the resulting magnets 23. Small deviations from the equal distribution may be provided in special cases.
  • Fig. 3 and 4 is illustrated in greater detail the magnet 23 and the securing thereof to the top of the vacuum chamber 17.
  • the vacuum chamber 17 is on its outer side provided with various reinforcing ribs 29.
  • bolts 31 are screwed at their one end, having their other end connected to end pieces of channels 35. These channels 35 contain the package forming the permanent magnets 23.
  • the magnet packages are maintained in their place by the end pieces 33 by the fact that the opposing end pieces for a magnet channel are attached by means of pull rods 37.
  • the bolts 31 make it possible to change the distance of the magnet channels from each other in such a way that the field intensity desired can be adjusted in the gap between the magnets 23.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Apparatus For Disinfection Or Sterilisation (AREA)
  • Electron Beam Exposure (AREA)

Abstract

Dans l'installation décrite (5'), qui sert à exposer des objets au rayonnement d'un courant d'électrons, le rayon d'électrons est amené à balayer l'objet pendant que celui-ci se déplace vers l'avant. Afin de rendre l'exposition au rayonnement plus homogène et plus efficace, on dispose une lentille extramagnétique (21) immédiatement sous la région à irradier. Cette lentille magnétique (21) dévie le rayon d'électrons, de sorte que les différentes parties du rayon d'électrons se retrouvent essentiellement parallèles ou légèrement convergentes après être passées par la lentille. La lentille magnétique utilisée se compose de deux aimants permanents allongés, disposés à proximité l'un de l'autre à courte distance. Grâce à un réglage approprié de la force et de la distance de ces aimants, on obtient un effet de déviation approprié. En outre, les aimants permanents sont de préférence construits à partir d'éléments d'aimant en forme de plaques, entre lesquels est placé un matériau magnétique doux.
PCT/SE1990/000085 1989-02-10 1990-02-08 Dispositif d'irradiation et lentille WO1990009667A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8900460A SE463055B (sv) 1989-02-10 1989-02-10 Anordning foer att bestraala artiklar med elektroner samt magnetisk lins foer avboejning av straalar av laddade partiklar, saerskilt elektroner
SE8900460-0 1989-02-10

Publications (1)

Publication Number Publication Date
WO1990009667A1 true WO1990009667A1 (fr) 1990-08-23

Family

ID=20375006

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1990/000085 WO1990009667A1 (fr) 1989-02-10 1990-02-08 Dispositif d'irradiation et lentille

Country Status (2)

Country Link
SE (1) SE463055B (fr)
WO (1) WO1990009667A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3845312A (en) * 1972-07-13 1974-10-29 Texas Instruments Inc Particle accelerator producing a uniformly expanded particle beam of uniform cross-sectioned density
US4075488A (en) * 1974-09-06 1978-02-21 Agency Of Industrial Science & Technology Pattern forming apparatus using quadrupole lenses
US4661712A (en) * 1985-05-28 1987-04-28 Varian Associates, Inc. Apparatus for scanning a high current ion beam with a constant angle of incidence
WO1987006391A1 (fr) * 1986-04-09 1987-10-22 Eclipse Ion Technology, Inc. Appareil et procede de balayage d'un faisceau d'ions
WO1988001731A1 (fr) * 1986-08-25 1988-03-10 Eclipse Ion Technology, Inc. Exploration parallele rapide par faisceaux ioniques ayant une lentille magnetique bipolaire avec champ non uniforme
WO1988002920A1 (fr) * 1986-10-08 1988-04-21 Varian Associates, Inc. Procede et appareil de balayage a angle d'incidence constant pour systemes a faisceaux d'ions

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3845312A (en) * 1972-07-13 1974-10-29 Texas Instruments Inc Particle accelerator producing a uniformly expanded particle beam of uniform cross-sectioned density
US4075488A (en) * 1974-09-06 1978-02-21 Agency Of Industrial Science & Technology Pattern forming apparatus using quadrupole lenses
US4661712A (en) * 1985-05-28 1987-04-28 Varian Associates, Inc. Apparatus for scanning a high current ion beam with a constant angle of incidence
WO1987006391A1 (fr) * 1986-04-09 1987-10-22 Eclipse Ion Technology, Inc. Appareil et procede de balayage d'un faisceau d'ions
WO1988001731A1 (fr) * 1986-08-25 1988-03-10 Eclipse Ion Technology, Inc. Exploration parallele rapide par faisceaux ioniques ayant une lentille magnetique bipolaire avec champ non uniforme
WO1988002920A1 (fr) * 1986-10-08 1988-04-21 Varian Associates, Inc. Procede et appareil de balayage a angle d'incidence constant pour systemes a faisceaux d'ions

Also Published As

Publication number Publication date
SE8900460L (sv) 1990-08-11
SE8900460D0 (sv) 1989-02-10
SE463055B (sv) 1990-10-01

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