CN213642866U - High specific activity cobalt-60 radioactive source for gyro rotary type radiosurgery treatment system - Google Patents
High specific activity cobalt-60 radioactive source for gyro rotary type radiosurgery treatment system Download PDFInfo
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- CN213642866U CN213642866U CN202021224856.4U CN202021224856U CN213642866U CN 213642866 U CN213642866 U CN 213642866U CN 202021224856 U CN202021224856 U CN 202021224856U CN 213642866 U CN213642866 U CN 213642866U
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Abstract
The utility model relates to a high specific activity cobalt-60 radioactive source for a gyro rotary type radiosurgery treatment system, which comprises a cobalt-60 radioactive core body, an inner cladding, a middle layer cladding component and an outer cladding component; the inner cladding consists of a stainless steel cylinder with an opening at one end and an inner cladding end plug, and the wall thickness of the end surface of the stainless steel cylinder is smaller than that of the side surface; the utility model discloses in tens piece of or even hundreds of pieces of radiation sources of dispersion concentrate and evenly distributed source storehouse, the tungsten alloy material that source storehouse skeleton is good for shielding gamma ray effect, and impoverishment uranium shielding stopper has good shielding gamma ray effect equally, has reduced the occupation space of radiation source in equipment, has reduced the weight of the source body, has simplified the flip-chip operation of radiation source, has improved the security.
Description
Technical Field
The utility model belongs to the technical field of nuclear medicine. Relates to a cobalt-60 radioactive source for a radiosurgery treatment system, in particular to a high-specific-activity cobalt-60 radioactive source for a gyroscopic rotary radiosurgery treatment system.
Background
Sealed radioactive sources are radioactive materials that are sealed in an envelope or tightly bound in a covering and are in a solid form. With the rapid development of economy and the accelerated promotion of industrialization process after 40 years of reform and opening, the sealed radioactive source is gradually applied to the fields of industry, agriculture, medicine, environmental protection and the like, forms a certain industrial scale and obtains remarkable economic and social benefits. One of the key directions of the application of the cobalt-60 sealed radioactive source in the medical field is tumor radiotherapy, which is a local treatment technology for treating malignant tumors by using cobalt-60 gamma rays, and is also called three main core means of the current tumor clinical treatment by operations and chemotherapy, and is the field with the most intensive and potential nuclear technology in medicine.
The gyrotron type cobalt-60 radiosurgery treatment system is one of the most advanced precise radiosurgery equipment in the world at present, the design adopts the rotation principle similar to an aerospace gyroscope, and a cobalt-60 radioactive source is arranged on two gyrotrons which synchronously rotate in the mutually vertical directions, so the gyrotron type cobalt-60 radiosurgery treatment system is also called as a gyrotron. The therapeutic purpose of destroying focus is achieved by utilizing the destructive effect of gamma rays emitted by cobalt-60 on living organisms, and the gamma rays are collimated, beam-limited and centripetally focused to form a high-dose region. During treatment, the preselected focus or target area is accurately positioned on the focus by the stereotactic positioning system, and the focus area is irradiated by continuous high dose to obtain effective treatment. The focus position is unchanged, the ray incidence direction is changed along with the rotation and revolution of the radioactive source, sensitive tissues are avoided and protected, normal tissues around the focus are only irradiated intermittently, instantaneously and slightly, almost no damage is caused, and meanwhile, the effective treatment space is expanded. Compared with the existing gamma knife, the focal skin ratio is larger, the positioning is more accurate, the side effect is smaller, the advantages of the focusing radiotherapy are brought into play to a very high level, and good treatment performance is generated. The gyro rotary radiosurgery treatment system is a whole body radiosurgery treatment equipment, and combines the original head gamma knife and body gamma knife into one equipment, and its cobalt-60 radioactive source also has need of making correspondent technical improvement.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a top rotation type radiosurgery treatment system is with high specific activity cobalt-60 radiation source, it concentrates evenly distributed with dozens of to hundreds of pieces of radiation sources among the original gamma sword and makes up into a piece of radiation source, reduces the occupation space of radiation source, has improved the security of radiation source, and the source is conveniently flip-chip.
The utility model discloses a solve above-mentioned technical problem through following technical scheme:
a high specific activity cobalt-60 radioactive source for a gyroscopic rotational radiosurgery system is composed of the following structures: the cobalt-60 radioactive core and the 3-layer cladding comprise an inner cladding, a sealing plug thereof, an intermediate cladding assembly and an outer cladding assembly.
Preferably, the core body consists of cobalt-60 particles, the activity of the core body is 11.1-14.8 TBq, the specific activity of cobalt particles is 300-320 Ci/g, the diameter of the core body is 4.5mm, the length of the core body is less than or equal to 21mm, and when the cobalt particles cannot fill the inner cladding, a gasket is added at the upper end to fill the inner cladding.
Preferably, the inner cladding and the sealing plug thereof are made of 1Cr18Ni9Ti austenitic stainless steel, the wall thickness of the side surface is 1mm, and the wall thickness of the bottom end (the ray outgoing end) is 0.5mm so as to improve the effective dose of gamma rays; the inner and outer bosses at the opening end of the inner cladding are uniform, the inner boss clamps the sealing plug, the outer boss is convenient for fixing the sealing plug, an argon arc welding machine special for a radioactive source is used between the sealing plug and the cladding, automatic vertical girth welding is adopted, the weld penetration is not less than the wall thickness of the weld joint of the cladding, and the surface of the weld joint is smooth and flat after welding.
Preferably, the middle shell assembly is cylindrical in shape and made of tungsten alloy, and comprises a source bin, a cover plate and a bottom plate, wherein the upper part and the lower part of the cylindrical body are concave and are respectively in tight fit with the cover plate and the bottom plate.
Furthermore, the source bin comprises a plurality of same holes, the inner diameter of each hole is the same as the outer diameter of the inner cladding shell, the depth of each hole is the same as the height of the inner cladding shell, and the source bin can be just filled with a source core wrapped by the inner cladding shell and does not protrude towards two ends.
Further, the cover plate is in a convex shape and is linked with the source bin part through 3 uniformly distributed screws.
Furthermore, the bottom plate is provided with round holes which correspond to the source bins and are the same in number, the diameter of each round hole is smaller than that of the inner package shell, and the bottom plate is connected with the source bins through 4 uniformly distributed screws.
Further, the density of the tungsten alloy is more than or equal to 18.5g/cm3The chemical purity is more than or equal to 99.9 percent.
Preferably, the upper end and the lower end of the outer casing are both concave, the middle layer cladding component is positioned at the lower end of the outer casing, a boss at the bottom of the middle layer cladding component is tightly matched with the concave at the lower end of the outer casing and is fixed by 4 evenly distributed screws, and the shielding plug is convex and is tightly matched with the concave at the upper end of the outer casing.
Furthermore, a certain gap is reserved between the lower end of the shielding plug and a cover plate of the middle-layer cladding assembly, the shielding plug is fixedly connected with the outer cladding through 2 symmetrical screws by the cover plate, the screws protrude upwards, and the shielding plug plays a role in positioning when a radioactive source is installed.
Furthermore, the material of the outer casing is 1Cr18Ni9Ti austenitic stainless steel, and the material of the shielding plug is depleted uranium.
Compared with the prior art, the utility model discloses an actively progress the effect and lie in:
(1) the source core of the utility model adopts cobalt-60 particles with high specific activity, reduces radiation penumbra, improves the definition of radiation field boundary, optimizes treatment accuracy and effect, has high technical application value, and has remarkable progress compared with the prior art;
(2) the utility model concentrates and evenly distributes dozens or even hundreds of scattered radioactive sources in the source bin, the source bin framework is made of tungsten alloy material with good gamma ray shielding effect, and the depleted uranium shielding plug has good gamma ray shielding effect, thereby reducing the occupied space of the radioactive source in the equipment, reducing the weight of the source body, simplifying the inverted operation of the radioactive source and improving the safety;
(3) the utility model discloses 3 the optimization design of layer cladding end is restrainted at the ray, has improved effective beam gamma ray dose rate of restrainting for the dose that gamma ray focused on the target point reaches the biggest, has optimized gamma ray's utilization ratio.
Drawings
FIG. 1 is a cross-sectional view of a high specific activity cobalt-60 radioactive source configuration for a gyroscopic rotational radiosurgical treatment system of the present invention;
FIG. 2 is a top view of the high specific activity cobalt-60 radioactive source for the gyroscopic rotational radiosurgical treatment system of the present invention;
FIG. 3 is a schematic view of the high specific activity cobalt-60 radioactive source intermediate shell assembly for the gyroscopic rotational radiosurgery system of the present invention;
figure 4 is a schematic view of the inner cladding structure of the high specific activity cobalt-60 radioactive source for the gyroscopic rotational radiosurgery system of the present invention.
1. A cobalt-60 radioactive core; 2. an inner envelope; 3. an intermediate shell assembly; 4. an outer casing assembly; 5. a shield plug; 6. positioning pins; 7. an outer covering cover plate; 8. an interlayer cladding assembly body; 9. a source bin; 10. the middle layer comprises a shell cover plate; 11. an interlayer can cladding backplane; 12. a special screw; 13. cobalt-60 particles; 14. the inner cladding is end-plugged.
Detailed Description
For a better understanding of the present invention, its objects are further attained by the technology disclosed in the appended claims, and its advantages and features are easily understood by those skilled in the art. It should be noted that the following description is only a preferred embodiment of the present invention, but the present invention is not limited to the following embodiment. In fact, it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the scope or spirit of the invention. For instance, features illustrated or described as part of one embodiment, can be used with another embodiment to yield a still further embodiment.
As shown in figures 1 and 2, the utility model provides a high specific activity cobalt-60 radioactive source for a gyro rotary radiosurgery system, which comprises a cobalt-60 radioactive core body 1, an inner cladding 2, an intermediate cladding component 3 and an outer cladding component 4. A plurality of the cobalt-60 radioactive cores 1 are wrapped in the inner cladding 2 and evenly distributed in the intermediate cladding assembly 3.
The activity of the cobalt-60 radioactive core 1 is 14.8TBq, the diameter of the core is 4.5mm, the height is less than or equal to 21mm, the cobalt-60 radioactive core consists of a plurality of cobalt-60 particles 13, and the specific activity of the cobalt-60 particles 9 is 320 Ci/g.
Because the cobalt-60 radioactive core body 1 adopts cobalt-60 particles with higher specific activity, the radiation penumbra is reduced, the definition of the radiation field boundary is improved, and the treatment precision and effect are optimized.
As shown in figure 4, the inner cladding 2 is composed of a stainless steel cylinder with an opening at one end and an inner cladding end plug 14, the inside of the opening end is concave and is tightly matched with the end plug 14, an argon arc welding machine special for a radioactive source is utilized between the sealing plug and the cladding, automatic vertical girth welding is adopted, the weld penetration is not less than the wall thickness of a weld joint of the cladding, the surface of the weld joint is smooth and flat after welding, the other end is a gamma-ray beam outlet end, the wall thickness of the end surface is 0.5mm, and the wall thickness of the side surface is 1mm, so that the blocking of the gamma.
As shown in fig. 1 and 3, the interlayer cladding assembly 3 includes an assembly body 8, a source bin 9, an interlayer cladding cover plate 10, and an interlayer cladding base plate 11.
The main body of the middle layer cladding component 3 is provided with circular holes, namely source bins 9, the number of which is corresponding to that of the cobalt-60 radioactive core 1, the diameter of each source bin 9 is slightly larger than the outer diameter of the inner cladding shell 2 and is used for packing the cobalt-60 radioactive core 1 wrapped by the inner cladding shell 2, the upper end of the main body is provided with a cover plate 10 which is connected with the main body 8 through special screws 12, the lower end of the main body 8 is provided with a bottom plate 11 which is connected with the main body through the special screws 12, the bottom plate 11 is provided with circular holes the same as the number of the source bins 9, and the diameter.
The middle layer cladding assembly main body 9, the middle layer cladding cover plate 10 and the middle layer cladding bottom plate 11 are all made of tungsten alloy and have the density of 18.8g/cm3And the chemical purity is 99.9%.
The special screw 12 is made of 3Cr13 martensitic stainless steel.
As shown in fig. 1, the outer envelope assembly 4 comprises a shell, a shield plug 5, and an outer envelope cover plate 7, wherein the outer envelope cover plate 7 is connected with the shell through a positioning pin 6.
The shielding plug 5 is convex, and the inner part of the upper end of the shell of the outer cladding component 4 is concave, is tightly matched with the shielding plug 5 and is positioned above the middle-layer cladding cover plate 10.
The shielding plug 5 is made of depleted uranium and has a good gamma ray shielding effect with a tungsten alloy intermediate component, and the shielding plug and the tungsten alloy intermediate component are combined to reduce the occupied space of a radioactive source in equipment, reduce the weight of a source body, simplify the inverted operation of the radioactive source and improve the safety.
Due to the optimized design of the outer cladding component 4 and the intermediate cladding component 3 at the gamma ray beam-emitting end, the effective dose rate of the emitted gamma rays is higher, the dose of the gamma rays focused on a target point is improved, and the utilization rate of the gamma rays is optimized.
The inner cladding and the end plugs thereof, the outer cladding component shell and the cover plate thereof are all made of 1Cr18Ni9Ti austenitic stainless steel.
The above-mentioned embodiments further explain the objects, technical solutions and advantages of the present invention in detail. It should be understood that the above description is only exemplary of the present invention and is not intended to limit the present invention, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. A high specific activity cobalt-60 radioactive source for a gyroscopic rotational radiosurgery system, comprising: the radioactive source comprises a cobalt-60 radioactive core (1) and a trilayer cladding, wherein the trilayer cladding comprises an inner cladding (2), an intermediate layer cladding assembly (3) and an outer cladding assembly (4); the cobalt-60 radioactive core (1) is arranged in the inner cladding (2); the middle layer cladding assembly (3) is cylindrical in shape and comprises a source bin (9), a middle layer cladding cover plate (10) and a middle layer cladding bottom plate (11), wherein the upper part and the lower part of the cylinder are concave and are fixedly connected with the middle layer cladding cover plate (10) and the middle layer cladding bottom plate (11) respectively; the middle layer cladding cover plate (10) is in a convex shape and is fixedly connected with the source bin (9) through a plurality of special screws (12) which are uniformly distributed; the source bin (9) comprises a plurality of same holes, the inner diameter of each hole is the same as the outer diameter of the inner cladding (2), and the depth of each hole is the same as the height of the inner cladding (2); the middle layer cladding bottom plate (11) is provided with round holes which correspond to the holes in the source bin (9) and are the same in number, the diameter of each round hole is smaller than that of the inner cladding (2), and the middle layer cladding bottom plate (11) is fixedly connected with the source bin (9) through a plurality of uniformly distributed special screws (12); the outer casing assembly (4) comprises a casing, a shielding plug (5) and an outer casing cover plate (7), the outer casing cover plate (7) is connected with the casing through a positioning pin (6), the positioning pin (6) protrudes upwards, the shielding plug (5) is in a convex shape, the inner part of the upper end of the outer casing assembly casing is in a concave shape and is tightly matched with the shielding plug (5), and the outer casing assembly (4) is positioned above the middle layer casing cover plate (10); the cylinder bottom of middle package shell subassembly (3) is provided with the annular flange, evenly be provided with a plurality of through-holes on the annular flange, the casing bottom face of outsourcing shell subassembly (4) is provided with the screw hole that corresponds with above-mentioned through-hole, middle package shell subassembly (3) and outsourcing shell subassembly (4) are through special screw (12) fixed connection.
2. The gyroscopic rotational radiosurgical treatment system of claim 1 further comprising a high specific activity cobalt-60 radioactive source, wherein: the inner cladding (2) is composed of a stainless steel cylinder with an opening at one end and an inner cladding end plug (14), the wall thickness of the end face of the stainless steel cylinder is smaller than that of the side face, bosses are arranged inside and outside the opening end of the inner cladding (2), the inner cladding end plug (14) is clamped by the inner boss, and the outer boss facilitates the fixation of the inner cladding end plug.
3. The gyroscopic rotational radiosurgical treatment system of claim 2 further comprising a high specific activity cobalt-60 radioactive source, wherein: the end wall thickness of the stainless steel cylinder of the inner packaging shell is 0.5mm, and the side wall thickness is 1 mm.
4. The gyroscopic rotational radiosurgical treatment system of claim 2 further comprising a high specific activity cobalt-60 radioactive source, wherein: a gasket is also arranged between the cobalt-60 radioactive core (1) and the inner cladding end plug (14).
5. The gyroscopic rotational radiosurgical treatment system of claim 2 further comprising a high specific activity cobalt-60 radioactive source, wherein: the inner cladding end plug (14) and the inner cladding (2) are automatically and vertically welded by using an argon arc welding machine special for a radioactive source, the weld penetration is not less than the wall thickness of the weld opening of the cladding, and the surface of the weld opening is smooth and flat after welding.
6. The gyroscopic rotational radiosurgical treatment system of claim 1 further comprising a high specific activity cobalt-60 radioactive source, wherein: the middle layer cladding assembly (3) is made of tungsten alloy and has the density of 18.8g/cm3The chemical purity is 99.9%; the shielding plug (5) is made of depleted uranium.
7. The gyroscopic rotational radiosurgical treatment system of claim 1 further comprising a high specific activity cobalt-60 radioactive source, wherein: a certain gap is arranged between the lower end of the shielding plug (5) and the middle layer cladding cover plate (10).
8. The gyroscopic rotational radiosurgical treatment system of claim 1 further comprising a high specific activity cobalt-60 radioactive source, wherein: the cobalt-60 radioactive core (1) is composed of a plurality of cobalt-60 particles (13), the activity of the cobalt-60 radioactive core is 14.8TBq, the diameter of the core is 4.5mm, the height of the core is less than or equal to 21mm, and the specific activity of the cobalt-60 particles (13) is 320 Ci/g.
9. The gyroscopic rotational radiosurgical treatment system of claim 1 further comprising a high specific activity cobalt-60 radioactive source, wherein: the special screw (12) is made of 3Cr13 martensitic stainless steel; the inner cladding (2), the outer cladding assembly shell and the outer cladding cover plate (7) are all made of 1Cr18Ni9Ti austenitic stainless steel.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021224856.4U CN213642866U (en) | 2020-06-29 | 2020-06-29 | High specific activity cobalt-60 radioactive source for gyro rotary type radiosurgery treatment system |
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| CN202021224856.4U CN213642866U (en) | 2020-06-29 | 2020-06-29 | High specific activity cobalt-60 radioactive source for gyro rotary type radiosurgery treatment system |
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| CN213642866U true CN213642866U (en) | 2021-07-09 |
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| CN202021224856.4U Active CN213642866U (en) | 2020-06-29 | 2020-06-29 | High specific activity cobalt-60 radioactive source for gyro rotary type radiosurgery treatment system |
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