CN211321603U - Ionizing radiation self-shielding device of isotope target system outside magnetic yoke - Google Patents
Ionizing radiation self-shielding device of isotope target system outside magnetic yoke Download PDFInfo
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- CN211321603U CN211321603U CN201921980487.9U CN201921980487U CN211321603U CN 211321603 U CN211321603 U CN 211321603U CN 201921980487 U CN201921980487 U CN 201921980487U CN 211321603 U CN211321603 U CN 211321603U
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Abstract
The utility model relates to the technical field of cyclotrons, and discloses an ionizing radiation self-shielding device 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 lateral side and the top of the cyclotrons, 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 do opposite or reverse linear movement 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 cyclotrons, the production target of the cyclotrons 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 utility model realizes the effective shielding, the safety and reliability of the medical device are improved, and the safety of workers is guaranteed.
Description
Technical Field
The utility model relates to a cyclotron technical field especially relates to an ionizing radiation self-shielding device that is arranged in outer isotope target system of yoke among the medical isotope production facility.
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.
SUMMERY OF THE UTILITY MODEL
Not enough to prior art exists, the utility model aims to provide an ionizing radiation of outer isotope target system of yoke is from shield assembly, has realized effectively shielding the ionizing radiation field that the cyclotron produced, has improved medical device's fail safe nature, guarantees staff's safety.
The above technical purpose of the present invention can be achieved by the following technical solutions:
the utility model provides an external isotope target system's of yoke ionizing radiation is from shield assembly, including isotope production target room, accelerator coating and drive arrangement, accelerator coating cladding in cyclotron's side direction, 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 cyclotron yoke, and the production target of cyclotron is located isotope production target room, and isotope production target room periphery has put lead shielding layer, contains boron polyethylene shielding layer, lead shielding layer, contain boron polyethylene shielding layer and all inlay and adorn in accelerator cladding.
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 utility model discloses further set up to, offer the holding chamber that is used for the holding cyclotron in the left side shield, the right side shield respectively, the upper portion in holding chamber is the cladding in the top cap at cyclotron top, and the inward flange of the top cap of the left side shield can be with the inward flange of the top cap of the right side shield amalgamation mutually.
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 utility model discloses further set up to, the inward flange of the top cap of left side shield, right side shield is equipped with the step face of mutually supporting respectively, and the limit line of the inward flange of top cap is the convex-concave form.
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 utility model discloses further set up to, the material of the left side shield of accelerator coating, right side shield is borated steel fiber concrete, and the mass percent 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 utility model discloses further set up as, boron-containing polyethylene shielding layer material is boron-containing polyethylene combined material, and the mass percent 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 utility model discloses further set up to, left side shield, right side shield all make rectilinear movement along the track of laying in basic ground through the drive arrangement drive, and drive arrangement is including installing in driving motor, driving wheel group, the driven wheelset of left side shield or right side shield bottom, and driving motor is organized the transmission with the action wheel and is connected, driving motor drive driving wheel group, organize from the track synchronous rolling.
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 utility model discloses further set up to, the subaerial upper berth of basis is equipped with three tracks that are parallel to each other, and a set of initiative wheelset, two sets of driven wheelset are all installed to left side shield, right side shield bottom, and the initiative wheelset rolls along a track in the middle of, and two sets of driven wheelsets roll along two tracks of preceding, rear side respectively, and three tracks are the heavy rail of P43, and initiative wheelset, driven wheelset are the bearing gyro wheel, driving motor is inverter 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 utility model discloses further set up to, be close to the position of track both ends tip is equipped with limiting buffer and the limit switch corresponding with left side shield, right side shield respectively, and limit switch is connected with inverter motor's controller, and limit switch is photoelectricity limit switch or 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 utility model discloses further set up to, the buffering portion material of spacing buffer is the polyurethane material, and the spacing support of spacing buffer adopts the steel sheet welding to form.
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 utility model discloses further set up to, left side shield, right side shield top all are equipped with the 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.
To sum up, the utility model discloses a beneficial technological effect does:
the utility model discloses a left side shield, the right side shield that the amalgamation formed are divided into to the accelerator coating, and left side shield, right side shield can do in opposite directions or reverse rectilinear movement through drive arrangement respectively, realize closing or the function that opens and shuts. 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 utility model discloses an accelerator coating adopts the mode of non-uniform thickness according to the radiation field spatial distribution characteristics that the cyclotron produced, rationally optimizes lateral and top shielding thickness to improve the space utilization of accelerator coating and reduce the weight of 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;
the utility model discloses increase spacing buffer at the terminal position of left side shield, right side shield operation, ensure that left side shield, right side shield move to setting for the position, safe and reliable ground parks. 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 utility model provides a larger installation space of isotope production targets, which can accommodate more targets, and adopts a composite shielding structure of a lead shielding layer and a boron-containing polyethylene shielding layer to realize 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 diagram of the whole structure of the cyclotron ionizing radiation self-shielding device of the present 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 diagram 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 fig. 1, 5, the utility model discloses an external isotope target system's of yoke ionizing radiation is from shield assembly, including isotope production target room 7, accelerator coating 4 and drive arrangement, accelerator coating 4 cladding in cyclotron 1's side direction, the top, accelerator coating 4 divide into the left side shield 5 that the amalgamation formed, right side shield 6, drive arrangement drive left side shield 5 and right side shield 6 do opposite or reverse rectilinear movement in order to close or open and shut accelerator coating 4, left side shield 5, the medial surface of right side shield 6 all inlays and is equipped with the isotope production target room 7 that is close to cyclotron 1 yoke, and cyclotron 1's production target 17 is located isotope production target room 7, isotope production target room 7 periphery has put lead shielding layer 2, contain boron polyethylene shielding layer 3, lead shielding layer 2, 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.
It is above only the utility model discloses a preferred embodiment, the utility model discloses a scope of protection does not only confine above-mentioned embodiment, the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (8)
1. The utility model provides an external isotope target system's of yoke ionizing radiation 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, a serial communication port, 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 in 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 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), isotope production target room (7) periphery has been put lead shielding layer (2), The boron-containing polyethylene shielding layer (3), the lead shielding layer (2) and the boron-containing polyethylene shielding layer (3) are all embedded in the accelerator coating layer (4).
2. The 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 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 self-shielding device for ionizing radiation of an isotope target system outside a magnetic yoke according to any one of claims 1 to 3, characterized in that: 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.
5. The self-shielding apparatus of claim 4, further comprising: 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.
6. The ionizing radiation self-shielding device of an off-yoke isotope target system of claim 5, 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.
7. The self-shielding apparatus of claim 6, further comprising: 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.
8. The self-shielding apparatus of claim 6, further comprising: 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).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921980487.9U CN211321603U (en) | 2019-11-16 | 2019-11-16 | Ionizing radiation self-shielding device of isotope target system outside magnetic yoke |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921980487.9U CN211321603U (en) | 2019-11-16 | 2019-11-16 | Ionizing radiation self-shielding device of isotope target system outside magnetic yoke |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110831314A (en) * | 2019-11-16 | 2020-02-21 | 中国原子能科学研究院 | Cyclotron ionizing radiation self-shielding device of magnet yoke external isotope target system |
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2019
- 2019-11-16 CN CN201921980487.9U patent/CN211321603U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110831314A (en) * | 2019-11-16 | 2020-02-21 | 中国原子能科学研究院 | Cyclotron ionizing radiation self-shielding device of magnet yoke external isotope target system |
| CN110831314B (en) * | 2019-11-16 | 2024-07-19 | 中国原子能科学研究院 | Cyclotron ionizing radiation self-shielding device of magnetic yoke external isotope target system |
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