CN110831314A - Cyclotron ionizing radiation self-shielding device of magnet yoke external isotope target system - Google Patents
Cyclotron ionizing radiation self-shielding device of magnet yoke external isotope target system Download PDFInfo
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- CN110831314A CN110831314A CN201911123374.1A CN201911123374A CN110831314A CN 110831314 A CN110831314 A CN 110831314A CN 201911123374 A CN201911123374 A CN 201911123374A CN 110831314 A CN110831314 A CN 110831314A
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- 230000005865 ionizing radiation Effects 0.000 title claims description 42
- 238000004519 manufacturing process Methods 0.000 claims abstract description 50
- 239000010410 layer Substances 0.000 claims abstract description 41
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims abstract description 37
- 229910052796 boron Inorganic materials 0.000 claims abstract description 37
- 239000011247 coating layer Substances 0.000 claims abstract description 37
- 239000004698 Polyethylene Substances 0.000 claims abstract description 24
- -1 polyethylene Polymers 0.000 claims abstract description 24
- 229920000573 polyethylene Polymers 0.000 claims abstract description 24
- 239000011248 coating agent Substances 0.000 claims description 21
- 238000000576 coating method Methods 0.000 claims description 21
- 239000000872 buffer Substances 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 9
- 239000010959 steel Substances 0.000 claims description 9
- 239000002131 composite material Substances 0.000 claims description 7
- 230000033001 locomotion Effects 0.000 claims description 7
- 239000000835 fiber Substances 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 3
- 229920002635 polyurethane Polymers 0.000 claims description 3
- 239000004814 polyurethane Substances 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 238000005267 amalgamation Methods 0.000 claims description 2
- 238000005253 cladding Methods 0.000 claims description 2
- 230000001360 synchronised effect Effects 0.000 claims 1
- 230000005855 radiation Effects 0.000 abstract description 4
- 238000009434 installation Methods 0.000 description 7
- 238000012423 maintenance Methods 0.000 description 5
- 230000003139 buffering effect Effects 0.000 description 4
- 238000009826 distribution Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000004308 accommodation Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002285 radioactive effect Effects 0.000 description 1
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H7/00—Details of devices of the types covered by groups H05H9/00, H05H11/00, H05H13/00
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- 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
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H13/00—Magnetic resonance accelerators; Cyclotrons
- H05H13/005—Cyclotrons
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H2277/00—Applications of particle accelerators
- H05H2277/10—Medical devices
- H05H2277/11—Radiotherapy
- H05H2277/116—Isotope production
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/10—Nuclear fusion reactors
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- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Spectroscopy & Molecular Physics (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Particle Accelerators (AREA)
Abstract
The invention relates to the technical field of a cyclotron, and discloses an ionization radiation self-shielding device of a cyclotron of an isotope target system outside a magnet yoke, which comprises an isotope production target chamber, an accelerator coating layer and a driving device, wherein the accelerator coating layer is coated on the side and the top of the cyclotron, the accelerator coating layer is divided into a left side shielding body and a right side shielding body which are spliced, the driving device drives the left side shielding body and the right side shielding body to linearly move in the opposite direction or the reverse direction so as to close or open and close the accelerator coating layer, the inner side surfaces of the left side shielding body and the right side shielding body are respectively embedded with the isotope production target chamber close to the magnet yoke of the cyclotron, the production target of the cyclotron is positioned in the isotope production target chamber, the periphery of the isotope production target chamber is provided with a lead shielding layer and a boron-containing polyethylene shielding layer, the invention realizes the effective shielding of an ionization, the safety and reliability of the medical device are improved, and the safety of workers is guaranteed.
Description
Technical Field
The invention relates to the technical field of cyclotrons, in particular to a self-shielding device for ionizing radiation of a cyclotrons, which is used for an isotope target system outside a magnet yoke in medical isotope production equipment.
Background
At present, in a medical medium-short-life isotope production cyclotron, an isotope production target system and an accelerator body can generate neutron and photon ionizing radiation during operation. According to the current regulations and standard requirements in China, ionizing radiation needs to be protected, the dosage rate limit value required by the standard is reduced, and the safety of radioactive workers and the public is ensured. The ionizing radiation shielding of accelerators for isotope production usually requires large-thickness concrete for protection, and the protection means is usually completed by adopting building structures such as shielding walls and the like. The shielding wall with large thickness has the defects of difficult construction, large occupied area and high manufacturing cost. In order to reduce the shielding thickness of the cyclotron building for isotope production and reasonably utilize the space of an accelerator room, it is necessary to design a self-shielding device of a multilayer composite shielding material for the ionizing radiation shielding of the accelerator.
Various isotope production targets at home and abroad are usually installed in an accelerator magnet yoke, and an independent isotope target room is not required to be designed for the self-shielding of an accelerator. The isotope production target system with multiple target positions needs larger installation and overhaul space and is more suitable to be installed in a factory building with a shielding structure. Therefore, the self-shielding device for providing the independent isotope target chamber on the outer side of the magnetic yoke is designed and developed, and the installation of the multi-target isotope production target system can be provided so as to reduce the shielding requirement of a factory building.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the cyclotron ionizing radiation self-shielding device of the isotope target system outside the magnet yoke, which realizes effective shielding of an ionizing radiation field generated by the cyclotron, improves the safety and reliability of a medical device and ensures the safety of workers.
The technical purpose of the invention is realized by the following technical scheme:
the utility model provides a circular accelerator ionizing radiation of outer isotope target system of yoke is from shield assembly, including isotope production target room, accelerator coating and drive arrangement, accelerator coating cladding in the side direction of circular accelerator, top, the accelerator coating divide into left side shield, the right side shield that the amalgamation formed, drive arrangement drive left side shield and right side shield do in opposite directions or reverse rectilinear movement in order to close or open and shut accelerator coating, the medial surface of left side shield, right side shield all inlays and is equipped with the isotope production target room that is close to the circular accelerator yoke, and the production target of circular accelerator is located isotope production target room, and isotope production target room periphery has put lead shielding layer, the polyethylene shielding layer that contains boron, lead shielding layer, the polyethylene shielding layer that contains all inlays and adorns in the accelerator coating.
By adopting the technical scheme, the coating layer of the accelerator is divided into the left side shield body and the right side shield body which are spliced, and the left side shield body and the right side shield body can respectively move linearly in opposite directions or in reverse directions through the driving device, so that the closing or opening and closing functions are realized. The accelerator coating is used for providing a maintenance and overhaul space for the cyclotron when being opened and closed, and the ionizing radiation shielding of the cyclotron is realized when the accelerator coating is closed. A lead shielding layer and a boron-containing polyethylene shielding layer are arranged on the periphery of the isotope production target chamber, neutron ionizing radiation generated by the isotope production target is slowed and absorbed by the boron-containing polyethylene shielding layer, photon ionizing radiation generated by the isotope production target is shielded by the lead shielding layer, and the space of the isotope production target chamber is designed reasonably; meanwhile, the boron-containing concrete of the accelerator coating layer shields ionizing radiation caused by stray beam loss generated inside the accelerator. The shielding device reasonably utilizes the space of a cyclotron installation hall, reduces the shielding requirement of the cyclotron installation hall, and ensures the use safety of the whole system.
The invention is further arranged in that the left side shield body and the right side shield body are respectively provided with an accommodating cavity for accommodating the cyclotron, the upper part of the accommodating cavity is a top cover covering the top of the cyclotron, and the inner edge of the top cover of the left side shield body can be spliced with the inner edge of the top cover of the right side shield body.
By adopting the technical scheme, the accelerator coating layer adopts a mode of non-uniform thickness according to the spatial distribution characteristics of a radiation field generated by the cyclotron, and the lateral and top shielding thicknesses are reasonably optimized, so that the space utilization rate of the accelerator coating layer is improved, and the weight of the self-shielding device is reduced.
The invention is further arranged that the inner edges of the top covers of the left side shielding body and the right side shielding body are respectively provided with mutually matched step surfaces, and the edge lines of the inner edges of the top covers are convex-concave.
By adopting the technical scheme, the combination part of the left side shield and the right side shield of the accelerator coating layer adopts a step surface splicing structure, and the edge line of the inner edge of the top cover is of a convex-concave shape and is used for preventing ionizing radiation from leaking through a through gap.
The accelerator coating layer is characterized in that the left side shield and the right side shield of the accelerator coating layer are made of boron-containing steel fiber concrete, and the mass percentage of boron is 5%.
By adopting the technical scheme, the accelerator coating layer is made of the nonstandard concrete material with the boron content of 5% and doped with the steel fibers to realize the shielding of the ionizing radiation, and the shielding material not only improves the shielding efficiency of the accelerator coating layer, but also improves the overall strength of the accelerator coating layer.
The invention is further set that the boron-containing polyethylene shielding layer is made of a boron-containing polyethylene composite material, and the mass percentage of boron is 3-5%; the lead shielding layer is made of lead.
By adopting the technical scheme, the boron-containing polyethylene shielding layer is made of the boron-containing polyethylene composite material, the mass percentage of boron is 3-5%, the lead shielding layer is made of lead, neutron ionizing radiation generated by the isotope production target is slowed and absorbed by the boron-containing polyethylene shielding layer, the lead shielding layer shields photon ionizing radiation generated by the isotope production target, and the space of the isotope production target chamber is designed reasonably.
The invention is further arranged in that the left side shield and the right side shield are driven by the driving device to move linearly along the track laid on the foundation ground, the driving device comprises a driving motor, a driving wheel set and a driven wheel set which are arranged at the bottom of the left side shield or the right side shield, the driving motor is in transmission connection with the driving wheel set, and the driving motor drives the driving wheel set and the driven wheel set to roll synchronously along the track.
By adopting the technical scheme, the left side shield body and the right side shield body can be driven by the driving device to move in opposite directions or in reverse directions along the track paved on the ground, so that the function of closing or opening the accelerator coating layer is realized.
The invention is further arranged in a way that three parallel tracks are laid on the foundation ground, a group of driving wheel set and two groups of driven wheel sets are respectively arranged at the bottoms of the left side shielding body and the right side shielding body, the driving wheel set rolls along one track in the middle, the two groups of driven wheel sets respectively roll along two tracks on the front side and the rear side, the three tracks are all P43 heavy tracks, the driving wheel set and the driven wheel set are bearing rollers, and the driving motor is a variable frequency motor.
Through adopting above-mentioned technical scheme, the subaerial three tracks that are parallel to each other that lay of basis, three tracks are P43 heavy rail, and driving wheel group, driven wheelset are the bearing gyro wheel, and driving motor is inverter motor, and driving wheel group adopts inverter motor drive left side shield, right side shield to realize linear motion, satisfies cyclotron's installation, use and maintenance, satisfies the operation demand of accelerator coating simultaneously.
The invention is further arranged that the positions close to the two end parts of the track are respectively provided with a limit buffer and a limit switch which correspond to the left side shield and the right side shield, the limit switch is connected with a controller of the variable frequency motor, and the limit switch is a photoelectric limit switch or a mechanical limit switch.
By adopting the technical scheme, the limiting buffers are added at the running end positions of the left side shield and the right side shield, so that the left side shield and the right side shield are ensured to run to the set positions, and the vehicle can be safely and reliably stopped. The left side shield body and the right side shield body are driven by the variable frequency motor, the transition process of starting and stopping of buffering is set, and damage to equipment caused by hard collision is avoided. And the photoelectric limit switch or the mechanical limit switch is arranged at the running end positions of the left side shield and the right side shield, so that the motion of the left side shield and the right side shield is controlled, the on-off state information of an accelerator coating layer is provided for the whole system, and the safety interlocking control of the cyclotron is realized.
The invention is further arranged that the buffering part of the limiting buffer is made of polyurethane material, and the limiting bracket of the limiting buffer is formed by welding steel plates.
By adopting the technical scheme, the limiting buffer is used for ensuring that the left side shielding body and the right side shielding body can be safely and reliably stopped at the set position, the transition process of starting and stopping of the buffer is set, and the damage of hard collision to equipment is avoided.
The invention is further provided that the top parts of the left side shield body and the right side shield body are respectively provided with a lifting hook.
Through adopting above-mentioned technical scheme, the lifting hook at accelerator coating top is convenient for accelerator coating's transportation, installation, use and maintenance.
In conclusion, the beneficial technical effects of the invention are as follows:
the coating layer of the accelerator is divided into a left side shield body and a right side shield body which are spliced, and the left side shield body and the right side shield body can respectively move linearly in opposite directions or in reverse directions through a driving device to realize the closing or opening function. The accelerator coating is used for providing a maintenance and overhaul space for the cyclotron when being opened and closed, and the ionizing radiation shielding of the cyclotron is realized when the accelerator coating is closed. A lead shielding layer and a boron-containing polyethylene shielding layer are arranged on the periphery of the isotope production target chamber, neutron ionizing radiation generated by the isotope production target is slowed and absorbed by the boron-containing polyethylene shielding layer, photon ionizing radiation generated by the isotope production target is shielded by the lead shielding layer, and the space of the isotope production target chamber is designed reasonably;
the accelerator coating layer adopts a mode of non-uniform thickness according to the spatial distribution characteristics of a radiation field generated by the cyclotron, and reasonably optimizes the shielding thickness in the lateral direction and the top part so as to improve the space utilization rate of the accelerator coating layer and reduce the weight of the self-shielding device; the accelerator coating layer is made of a nonstandard concrete material with 5% of boron content and doped with steel fibers to realize ionizing radiation shielding, and the shielding material not only improves the shielding efficiency of the accelerator coating layer, but also improves the overall strength of the accelerator coating layer; the boron-containing polyethylene shielding layer moderates and absorbs neutron ionizing radiation generated by the isotope production target, and the lead shielding layer shields photon ionizing radiation generated by the isotope production target. The space of an isotope production target chamber is designed reasonably, the size of an accelerator coating layer is optimally designed according to the distribution characteristics of the radiation field of the cyclotron, the ionizing radiation field generated by the cyclotron is effectively shielded, the safety and reliability of a medical device are improved, and the safety of workers is ensured;
according to the invention, the limiting buffers are added at the running end positions of the left side shield and the right side shield, so that the left side shield and the right side shield are ensured to run to the set positions, and the vehicle can be safely and reliably stopped. The left side shield body and the right side shield body are driven by the variable frequency motor, the transition process of starting and stopping of buffering is set, and damage to equipment caused by hard collision is avoided. And the photoelectric limit switch or the mechanical limit switch is arranged at the running end positions of the left side shield and the right side shield, so that the motion of the left side shield and the right side shield is controlled, the on-off state information of an accelerator coating layer is provided for the whole system, and the safety interlocking control of the cyclotron is realized.
The invention provides a larger installation space of an isotope production target, can realize the accommodation of more target positions, adopts a composite shielding structure of a lead shielding layer and a boron-containing polyethylene shielding layer, and realizes a special large-space compact isotope production target chamber; meanwhile, the boron-containing steel fiber concrete material with special proportion is used as the accelerator coating layer, the overall shielding thickness of the self-shielding device is reduced, the mechanical performance of the shielding structure is improved, and the space of a cyclotron hall is utilized to the maximum extent by adopting the shielding structure with non-uniform thickness.
Drawings
Fig. 1 is a schematic view of the overall structure of the cyclotron ionizing radiation self-shielding device of the invention;
FIG. 2 is a schematic diagram of the right shield of the accelerator coating of FIG. 1;
FIG. 3 is a schematic diagram of the left shield of the accelerator coating of FIG. 1;
FIG. 4 is a schematic illustration of the accelerator coating closed state of the present invention;
figure 5 is a horizontal cross-sectional view of the cyclotron ionizing radiation self-shielding device shown in figure 4.
Reference numerals: 1. a cyclotron; 2. a lead shielding layer; 3. a boron-containing polyethylene barrier layer; 4. an accelerator coating layer; 5. a left shield; 6. a right shield; 7. an isotope production target chamber; 8. a driving wheel set; 9. a driven wheel set; 10. a limiting buffer; 11. a hook; 12. a track; 13. a foundation ground; 14. a top cover; 15. an inner edge; 16. a side line; 17. and (6) producing the target.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in figures 1 and 5, the invention discloses a cyclotron ionizing radiation self-shielding device of an isotope target system outside a magnet yoke, which comprises an isotope production target chamber 7, an accelerator coating layer 4 and a driving device, wherein the accelerator coating layer 4 is coated on the side and the top of a cyclotron 1, the accelerator coating layer 4 is divided into a left side shielding body 5 and a right side shielding body 6 which are spliced, the driving device drives the left side shielding body 5 and the right side shielding body 6 to do linear movement in the opposite direction or the reverse direction so as to close or open and close the accelerator coating layer 4, the inner side surfaces of the left side shielding body 5 and the right side shielding body 6 are embedded with the isotope production target chamber 7 which is close to the magnet yoke of the cyclotron 1, a production target 17 of the cyclotron 1 is positioned in the isotope production target chamber 7, a lead shielding layer 2, a boron-containing polyethylene shielding layer 3, a lead shielding layer 2 and a drive device, The boron-containing polyethylene shielding layers 3 are all embedded in the accelerator coating layer 4;
as shown in fig. 2 and 3, the left shield 5 and the right shield 6 are respectively provided with a containing cavity for containing the cyclotron 1, the upper part of the containing cavity is a top cover 14 covering the top of the cyclotron 1, and the inner edge 15 of the top cover 14 of the left shield 5 can be spliced with the inner edge 15 of the top cover 14 of the right shield 6; the inner edges 15 of the top covers 14 of the left side shielding body 5 and the right side shielding body 6 are respectively provided with mutually matched step surfaces, and the edge lines 16 of the inner edges 15 of the top covers 14 are in a convex-concave shape; the top parts of the left shield 5 and the right shield 6 are provided with lifting hooks 11; the left shield 5 and the right shield 6 of the accelerator coating layer 4 are both made of boron-containing steel fiber concrete, and the mass percentage of boron is 5%; the material of the boron-containing polyethylene shielding layer 3 is a boron-containing polyethylene composite material, and the mass percent of boron is 3-5%; the lead shielding layer 2 is made of lead;
as shown in fig. 4 and 5, three parallel rails 12 are laid on a foundation ground 13, the left shield 5 and the right shield 6 are driven by a driving device to linearly move along the three parallel rails 12, the driving device includes a driving motor installed at the bottom of the left shield 5 or the right shield 6, a set of driving wheel set 8 and two sets of driven wheel set 9, the driving motor is in transmission connection with the driving wheel set 8, the driving motor drives the driving wheel set 8 and the driven wheel set 9 to synchronously roll along the rails 12, the driving wheel set 8 rolls along a middle rail 12, the two sets of driven wheel sets 9 respectively roll along the front and rear rails 12, the three rails 12 are P43 heavy rails, the driving wheel set 8 and the driven wheel set 9 are bearing rollers, and the driving motor is a variable frequency motor; the positions close to the end parts of the two ends of the track 12 are respectively provided with a limit buffer 10 and a limit switch corresponding to the left side shield 5 and the right side shield 6, the limit switch is connected with a controller of the variable frequency motor, the limit switch is a photoelectric limit switch or a mechanical limit switch, the buffering part of the limit buffer 10 is made of polyurethane materials, and a limit support of the limit buffer 10 is formed by welding steel plates.
When the present embodiment is used, the operation,
the left shield 5 and the right shield 6 of the accelerator coating 4 are driven by a driving device to move linearly in opposite directions or in reverse directions along three mutually parallel rails 12 so as to close or open the accelerator coating 4, a limiting buffer 10 is added at the end position of the operation, the left shield 5 and the right shield 6 are ensured to move to the set position, and the vehicle can be safely and reliably stopped. The accelerator coating layer 4 is used for providing a maintenance and overhaul space of the cyclotron 1 when being opened and closed, the accelerator coating layer 4 shields ionizing radiation of the cyclotron 1 when being closed, a production target 17 of the cyclotron 1 is positioned in the isotope production target chamber 7, a lead shielding layer 2 and a boron-containing polyethylene shielding layer 3 are arranged on the periphery of the isotope production target chamber 7 to form a composite shielding structure, neutron ionizing radiation generated by the production target 17 is slowed down and absorbed, and the lead shielding layer 2 shields photon ionizing radiation generated by the production target 17. The joint part of the left side shield body 5 and the right side shield body 6 of the accelerator coating layer 4 adopts a step surface splicing structure, and the edge line 16 of the inner edge 15 of the top cover 14 is of a convex-concave shape and is used for preventing ionizing radiation from leaking through a through gap.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (10)
1. The utility model provides a cyclotron ionizing radiation of outer isotope target system of yoke is from shield assembly, including isotope production target room (7), accelerator coating (4) and drive arrangement, accelerator coating (4) cladding in the side direction of cyclotron (1), top, its characterized in that, accelerator coating (4) divide into left side shield (5), right side shield (6) that the amalgamation formed, drive arrangement drive left side shield (5) and right side shield (6) do opposite directions or reverse rectilinear movement in order to close or open and shut accelerator coating (4), the medial surface of left side shield (5), right side shield (6) all inlays and is equipped with the isotope production target room (7) that is close to cyclotron (1) yoke, and production target (17) of cyclotron (1) are located isotope production target room (7), the periphery of the isotope production target chamber (7) is provided with a lead shielding layer (2) and a boron-containing polyethylene shielding layer (3), and the lead shielding layer (2) and the boron-containing polyethylene shielding layer (3) are embedded in the accelerator coating layer (4).
2. The cyclotron ionizing radiation self-shielding device of an off-yoke isotope target system of claim 1, wherein: the left side shield body (5) and the right side shield body (6) are respectively provided with an accommodating cavity for accommodating the cyclotron (1), the upper part of the accommodating cavity is a top cover (14) coated on the top of the cyclotron (1), and the inner edge (15) of the top cover (14) of the left side shield body (5) can be spliced with the inner edge (15) of the top cover (14) of the right side shield body (6).
3. The cyclotron ionizing radiation self-shielding device of an off-yoke isotope target system of claim 2, wherein: the inner edges (15) of the top covers (14) of the left side shielding body (5) and the right side shielding body (6) are respectively provided with mutually matched step surfaces, and the edge lines (16) of the inner edges (15) of the top covers (14) are convex-concave.
4. The cyclotron ionizing radiation self-shielding device of an isotope target system outside a magnet yoke according to any one of claims 1 to 3, wherein: the left shield (5) and the right shield (6) of the accelerator coating layer (4) are made of boron-containing steel fiber concrete, and the mass percentage of boron is 5%.
5. The cyclotron (1) of an external magnet yoke isotope target system of any claim 1 to 3 is provided with a self-shielding device for ionizing radiation, which is characterized in that: the boron-containing polyethylene shielding layer (3) is made of a boron-containing polyethylene composite material, and the mass percentage of boron is 3-5%; the lead shielding layer (2) is made of lead.
6. The cyclotron ionizing radiation self-shielding device of an isotope target system outside a magnet yoke according to any one of claims 1 to 3, wherein: left side shield (5), right side shield (6) are all made rectilinear movement along track (12) of laying in basic ground (13) through the drive arrangement drive, and drive arrangement is including installing in the driving motor, driving wheel group (8), driven wheelset (9) of left side shield (5) or right side shield (6) bottom, and driving motor and driving wheel group (8) are connected mutually in the transmission, and driving motor drive driving wheel group (8), driven wheelset (9) are along track (12) synchronous roll.
7. The cyclotron ionizing radiation self-shielding device of an off-yoke isotope target system of claim 6, wherein: foundation ground (13) upper berth is equipped with three tracks (12) that are parallel to each other, and a set of initiative wheelset (8), two sets of driven wheelset (9) are all installed to left side shield (5), right side shield (6) bottom, and initiative wheelset (8) roll along a track (12) in the middle of, and two sets of driven wheelset (9) are respectively along two tracks (12) of preceding, rear side and roll, and three tracks (12) are P43 heavy rail, and initiative wheelset (8), driven wheelset (9) are the bearing gyro wheel, driving motor is inverter motor.
8. The cyclotron ionizing radiation self-shielding device of an off-yoke isotope target system of claim 7, wherein: and the positions close to the end parts of the two ends of the track (12) are respectively provided with a limit buffer (10) and a limit switch, wherein the limit buffer and the limit switch correspond to the left side shield (5) and the right side shield (6), the limit switch is connected with a controller of the variable frequency motor, and the limit switch is a photoelectric limit switch or a mechanical limit switch.
9. The cyclotron ionizing radiation self-shielding device of an off-yoke isotope target system of claim 8, wherein: the buffer part of the limiting buffer (10) is made of polyurethane material, and the limiting support of the limiting buffer (10) is formed by welding steel plates.
10. The cyclotron ionizing radiation self-shielding device of an off-yoke isotope target system of claim 6, wherein: and the tops of the left side shield body (5) and the right side shield body (6) are respectively provided with a lifting hook (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911123374.1A CN110831314B (en) | 2019-11-16 | 2019-11-16 | Cyclotron ionizing radiation self-shielding device of magnetic yoke external isotope target system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911123374.1A CN110831314B (en) | 2019-11-16 | 2019-11-16 | Cyclotron ionizing radiation self-shielding device of magnetic yoke external isotope target system |
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| Publication Number | Publication Date |
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| CN110831314A true CN110831314A (en) | 2020-02-21 |
| CN110831314B CN110831314B (en) | 2024-07-19 |
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| CN201911123374.1A Active CN110831314B (en) | 2019-11-16 | 2019-11-16 | Cyclotron ionizing radiation self-shielding device of magnetic yoke external isotope target system |
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Cited By (2)
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