A radioactive source fixation device, an inspection system, and a method of use

Abstract

The present application relates to the technical field of nuclear facility radiation monitoring and safety, and particularly relates to a radioactive source fixing device, an overhauling system and a use method. The radioactive source fixing device comprises: a support assembly, which is adapted to be connected with a calibrated pipeline; a fixing assembly, which is connected with the support assembly and is adapted to be at least partially inserted into the calibrated pipeline, and an end portion of the fixing assembly in the calibrated pipeline is provided with a radioactive source. The present application provides a radioactive source fixing device, an overhauling system and a use method to solve the problem that in the process of calibrating a detector by using a standard radioactive source, the operation is completely dependent on manual holding of the radioactive source in a strong radiation field (both the pipeline body radiation and the radioactive source radiation exist), the operator needs to be exposed to a high-dose radiation environment for a long time at a close distance, the radiation dose is large, and the ALARA principle is seriously violated.

Description

Technical Field

[0001] This invention relates to the field of radiation monitoring and safety technology for nuclear facilities, specifically to a radioactive source fixing device, maintenance system, and method of use. Background Technology

[0002] In the operation of high-temperature gas-cooled reactors, continuous and accurate monitoring of gamma radioactivity in the inlet pipe of the primary helium purification system is crucial. It is one of the core parameters for determining the integrity of reactor fuel elements and ensuring the safe operation of the power plant. The online high-range gamma monitor, which undertakes this monitoring task, typically places its detector in a thick lead-shielded chamber (e.g., 140 mm thick) and aligns it with the pipe only through a narrow collimation hole (e.g., 20 mm in diameter) to maintain normal operation in extreme environments.

[0003] High-temperature gas-cooled reactors typically have two sets of online high-range gamma-ray monitors per reactor to measure gamma-ray radioactivity in the inlet pipes of the helium purification system. Due to the high inlet temperature and gamma-ray radiation dose of the helium purification system in high-temperature gas-cooled reactors, the detectors of the online high-range gamma-ray monitors are located within a 140mm thick lead-shielded chamber, which has only one 20mm diameter circular hole facing the calibrated pipe.

[0004] Regular calibration of online high-range gamma monitors is crucial for ensuring the accuracy and reliability of their measurement data. However, current calibration procedures have significant technical and safety shortcomings. Specifically, the calibration process requires personnel to manually hold a standard radioactive source, move it along the surface of the helium purification system's inlet pipe, and manually hover it in front of a limited opening in the lead-shielded chamber.

[0005] Relying solely on manual hand-held positioning inevitably introduces significant operational errors. The spatial relative position between the radiation source and the detector within the lead-shielded cavity—including precise straight-line distance, alignment angle, and height—is difficult to perfectly reproduce in every calibration. Even minute hand tremors or positional deviations can directly alter the gamma flux irradiating the detector, severely impacting the consistency, repeatability, and accuracy of calibration results, and potentially affecting critical assessments of the reactor's condition.

[0006] Meanwhile, to ensure the long-term reliability of monitoring data, the detector needs to be calibrated regularly using a standard radiation source. Current technology relies entirely on manual operation of the handheld radiation source in a strong radiation field (where there is both radiation from the pipeline itself and the radiation source). Operators are exposed to high-dose radiation at close range for extended periods, resulting in large doses of radiation and seriously violating the principle of optimal radiation protection (ALARA). Summary of the Invention

[0007] This invention provides a radioactive source fixing device, maintenance system, and usage method to solve the problem that during the periodic calibration of detectors using standard radioactive sources, the operation relies entirely on manual hand-held operation of the radioactive source in a strong radiation field (where there is both pipeline body radiation and radioactive source radiation). This requires operators to be exposed to a high-dose radiation environment at close range for extended periods, resulting in large radiation doses and seriously violating the principle of optimal radiation protection (ALARA).

[0008] In a first aspect, the present invention provides a radiation source fixing device, comprising: A support assembly adapted to be connected to the calibrated pipe; A fixing component, connected to the support assembly, is at least partially adapted to extend into the calibrated pipe, and the end of the fixing component located within the calibrated pipe is provided with a radiation source.

[0009] Beneficial effects: By setting up a support assembly and a fixing assembly, the support assembly is connected to the calibrated pipeline, eliminating the need for on-site personnel to manually operate the radiation source. The radiation source can be placed into the calibrated pipeline for calibration, allowing staff to stay away from the helium purification system inlet pipeline and radiation source, reducing unnecessary gamma radiation exposure, and complying with the "distance" and "time" principles of the three principles of external radiation protection (ALARA principles: time, distance, shielding).

[0010] In one optional embodiment, the support assembly includes a first movable half-ring and a second movable half-ring, which together form a ring, and the first movable half-ring and the second movable half-ring are rotatably connected by a connector.

[0011] Beneficial effects: The first and second movable half-rings are rotatably connected by the connector, so that the first movable half-ring can rotate relative to the second movable half-ring, and the two can be adapted to the shape of the calibrated pipeline.

[0012] In one optional embodiment, fixing screws are respectively provided on the first movable half-ring and the second movable half-ring, and the fastening end of the fixing screws is connected to the calibrated pipe.

[0013] Beneficial effects: It enables the first and second movable half-rings to be fixedly connected to the calibrated pipeline, ensuring stability during use.

[0014] In one optional embodiment, the fastening end of the fixing screw passes through the outer peripheral surface of the first movable half-ring or the outer peripheral surface of the second movable half-ring and extends out of the annular space; or, the fastening end passes through the inner peripheral wall of the first movable half-ring or the inner peripheral wall of the second movable half-ring and extends into the annular space.

[0015] Beneficial effects: The movable bracket can be fitted onto the outer circumference of the calibrated pipe or connected to the inner circumference of the calibrated pipe. The connection between the bracket and the calibrated pipe is fixed by screws to ensure long-term stability, without slippage, loosening, or eccentricity.

[0016] In one optional embodiment, the resulting first movable semi-ring or second movable semi-ring is provided with an adsorption element so that the first movable semi-ring and the second movable semi-ring form a ring structure.

[0017] Beneficial effects: The magnetic attraction of the first and second movable semi-rings forms a ring structure, which ensures both convenient installation and absolute stability during use, even in vibration environments.

[0018] In one optional embodiment, the fixing component includes a fixing bracket disposed on the inner peripheral wall of the first movable half-ring or the second movable half-ring, and the length of the fixing bracket is greater than the length of the first movable half-ring or the length of the second movable half-ring.

[0019] Beneficial effects: Fixed bracket along Figure 3 The length in the X direction is greater than the length of the first or second movable half-ring, so that the fixed bracket extends into the pipe being calibrated, which facilitates calibration.

[0020] In one alternative embodiment, the fixed bracket is equipped with a level to determine the levelness of the fixed bracket.

[0021] Beneficial effects: It allows high-precision levels to be directly integrated onto a fixed bracket, enabling an integrated operation process of "installation-leveling-calibration" without the need for additional tools, thus significantly improving positioning accuracy.

[0022] In one optional embodiment, the fixed bracket has a fixed box at one end away from the bracket assembly, the fixed box is detachably connected to the fixed bracket, and the fixed box contains a radiation source.

[0023] Beneficial effects: It achieves the fixation of the radioactive source, adopts a standardized radioactive source fixing box design that can be quickly replaced, and is compatible with various specifications of calibration sources. At the same time, the internal anti-rotation structure and external locking mechanism ensure the safety of the radioactive source.

[0024] Secondly, the present invention also provides a maintenance system including the aforementioned radioactive source fixing device.

[0025] Thirdly, the present invention also provides a method of using a radiation source fixing device, wherein a support assembly is connected to a calibrated pipe, and the fixing assembly is at least partially adapted to extend into the calibrated pipe to calibrate the radiation value in the calibrated pipe. Attached Figure Description

[0026] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 This is a front view of the radiation source fixing device according to an embodiment of the present invention; Figure 2 This is a top view of the radiation source fixing device according to an embodiment of the present invention; Figure 3 Left view of the radiation source fixing device according to an embodiment of the present invention. Explanation of reference numerals in the attached drawings: 1. Support assembly; 101. First movable semi-ring; 102. Second movable semi-ring; 103. Fixing screw; 104. Connector; 105. Annular space; 2. Fixing assembly; 201. Fixing bracket; 202. Level; 203. Fixing box; 3. Adsorption component. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] The following is combined with Figures 1 to 3 The following describes embodiments of the present invention.

[0030] According to an embodiment of the present invention, in one aspect, a radiation source fixing device is provided, comprising: Support assembly 1, which is adapted to be connected to the pipe being calibrated; Fixing component 2 is connected to support component 1. Fixing component 2 is at least partially adapted to extend into the calibrated pipe. The end of fixing component 2 located in the calibrated pipe is provided with a radiation source.

[0031] The support assembly 1 is connected to the calibrated pipe, and the fixing assembly 2 is at least partially adapted to extend into the calibrated pipe to calibrate the radiation value in the calibrated pipe.

[0032] By setting up a support assembly 1 and a fixing assembly 2, with the support assembly 1 connected to the calibrated pipeline, the need for on-site personnel to manually operate the radiation source is eliminated. The radiation source can be simply placed inside the calibrated pipeline for calibration. This allows personnel to stay away from the helium purification system inlet pipeline and the radiation source, reducing unnecessary gamma radiation exposure and complying with the "distance" and "time" principles of the ALARA principles (time, distance, shielding). It should be noted that the radiation source used in this implementation is a standard radiation source.

[0033] In one embodiment, such as Figure 1 , Figure 2 and Figure 3 As shown, the support assembly 1 includes a first movable semi-ring 101 and a second movable semi-ring 102. The first movable semi-ring 101 and the second movable semi-ring 102 are enclosed to form a ring. The first movable semi-ring 101 and the second movable semi-ring 102 are rotatably connected by a connector 104. The first movable semi-ring 101 and the second movable semi-ring 102 are rotatably connected by the connector 104, so that the first movable semi-ring 101 can rotate relative to the second movable semi-ring 102, and the two can be adapted to the shape of the calibrated pipe.

[0034] In this embodiment, if the first movable half-ring 101 and the second movable half-ring 102 are connected by a mortise and tenon structure 104, no additional fasteners are needed. The integrated nesting structure at the ends of the half-rings achieves the dual functions of splicing and rotation. The two ends of the first movable half-ring 101 and the second movable half-ring 102 are respectively processed into matching tenons and mortises in the structural design. Both the tenons and mortises adopt an arc-shaped structure, which is consistent with the arc curvature of the half-rings, ensuring that a complete and smooth ring is formed after splicing. During splicing, the tenons and mortises of the two half-rings are precisely aligned and gently pushed in along the axial direction, so that the protrusion on the inner side of the mortise is embedded in the annular groove of the tenon, forming a nested fit. After splicing, the outer and inner circles of the two half-rings are completely flush, forming a complete ring. During rotation, the two semi-rings can rotate relative to each other around the arc-shaped contact surface of the nested part. The annular groove and protrusion not only serve as axial limiters to prevent the spliced ​​parts from falling off, but also guide the direction of rotation to avoid deviation or jamming. It has the advantages of compact structure, high rotation accuracy, and no obvious shaking.

[0035] If the first movable semi-ring 101 and the second movable semi-ring 102 are connected by hinge pins 104, the ends of the two movable semi-rings can be hinged together to form a ring while ensuring flexible rotation of the two semi-rings. Both ends of the two movable semi-rings are welded or integrally machined with ear plates, which are symmetrically arranged and can completely fit together at corresponding ends. A coaxial pin hole is opened in the center of the ear plate, and a pin passes through the pin hole. After inserting the pin, the two ends of the pin are fixed with a cotter pin or snap ring to complete the splicing. At this point, the two semi-rings are hinged together by the pin to form a closed loop. During rotation, the two semi-rings can rotate freely around the pin, with a rotation angle of up to 180°, meeting the rotation requirements in different scenarios. This method has the advantages of strong load-bearing capacity, flexible rotation, large angle, and convenient installation and disassembly. The two methods described above each have their own advantages. In actual use, the appropriate connection method can be selected according to specific working conditions, space requirements, and other needs to ensure the stability and smooth rotation of the spliced ​​ring structure.

[0036] If the first movable half-ring 101 and the second movable half-ring 102 are connected by hinges 104, the hinges consist of leaf blades, a pivot, and locking components. The leaf blades are fixedly connected to the ends of the two movable half-rings by bolts. The pivot ensures flexibility and load-bearing stability during rotation, ensuring the alignment accuracy of the half-rings. During rotation, the pivot reduces the frictional resistance between the leaf blades and the pivot through its own lubrication structure (or lubrication treatment), resulting in smooth rotation without significant abnormal noise or jamming. The hinges provide connection and rotational support for the movable half-rings, enabling the opening and closing of the ring structure. This meets the design requirements for being detachable and assemblable. The structural design balances assembly convenience and structural stability. The symmetrical structure of the movable half-rings ensures uniform stress distribution across the entire ring, while the precise assembly of the hinges ensures smooth opening and closing.

[0037] In one embodiment, such as Figure 1 , Figure 2 and Figure 3 As shown, fixing screws 103 are respectively installed on the first movable half-ring 101 and the second movable half-ring 102. The fastening end of the fixing screw 103 is connected to the calibrated pipe, thereby realizing the fixed connection between the first movable half-ring 101 and the second movable half-ring 102 and the calibrated pipe, ensuring stability during use.

[0038] In this embodiment, in order to ensure the stable connection between the fixing screw 103 and the annular calibrated pipe, two or more fixing screws 103 are symmetrically arranged to avoid eccentricity or local stress concentration caused by unilateral force. That is, the annular support assembly 1 composed of the first movable half ring 101 and the second movable half ring 102 is provided with at least two fixing screws 103 in the circumferential direction.

[0039] In one embodiment, such as Figure 1 , Figure 2 and Figure 3 As shown, the fastening end of the fixing screw 103 passes through the outer circumferential surface of the first movable half-ring 101 or the outer circumferential surface of the second movable half-ring 102 and extends out to the outside of the annular space 105; or, the fastening end passes through the inner circumferential wall of the first movable half-ring 101 or the inner circumferential wall of the second movable half-ring 102 and extends into the annular space 105, so that the movable bracket is sleeved on the outer circumferential surface of the calibrated pipe or connected to the inner circumferential wall of the calibrated pipe. In specific use, when the first movable half-ring 101 and the second movable half-ring 102 are respectively connected to the outer circumferential surface of the calibrated pipe (the calibrated pipe is located in the annular space 105), the set screw can be directly pressed against it. With the help of the positioning plane, pit or arc groove machined on the outer surface of the calibrated pipe, the end of the screw is embedded in the positioning groove, changing from simple friction locking to mechanical limiting and clamping, effectively preventing circumferential rotation and axial movement. For the inner circumferential surface clamping (space-accommodating support assembly 1 within the calibrated pipe), when the first movable semi-ring 101 and the second movable semi-ring 102 are connected to the inner circumferential wall of the calibrated pipe, the conical sleeve is pulled by bolts, causing the slotted expansion sleeve to expand radially outward, tightly fitting against the inner bore wall and generating a uniform radial tightening force. This method ensures coaxiality, provides a large locking force, and avoids excessive damage to the bore wall. The connection between the fixing screw 103 and the calibrated pipe ensures long-term stability, preventing slippage, loosening, and eccentricity.

[0040] In one embodiment, such as Figure 1 , Figure 2 and Figure 3 As shown, an adsorption element 3 is provided inside the first movable semi-ring 101 or the second movable semi-ring 102 to form a ring structure. Specifically, the adsorption element 3 is a magnet. The first movable semi-ring 101 and the second movable semi-ring 102 form a ring structure by magnetic attraction through the adsorption element 3, which ensures both convenient installation and absolute stability during use, and can achieve precise positioning even in vibration environments.

[0041] In one embodiment, such as Figure 1 , Figure 2 and Figure 3 As shown, the fixed bracket 201 is disposed on the inner peripheral wall of the first movable semi-ring 101 or the second movable semi-ring 102. The length of the fixed bracket 201 is greater than the length of the first movable semi-ring 101 or the length of the second movable semi-ring 102, that is, the fixed bracket 201 is along... Figure 3The length in the X direction is greater than the length of the first movable semi-ring 101 or the second movable semi-ring 102, allowing the fixed bracket 201 to extend into the pipe being calibrated for easy calibration. It should be noted that the fixed bracket 201 in this embodiment is not rod-shaped; it is L-shaped. When in contact with the inner circumferential wall of the first movable semi-ring 101 or the second movable semi-ring 102, the fixed bracket 201 can still extend into the pipe being calibrated, even if the pipe being calibrated is located within the annular space 105. Furthermore, the fixed bracket 201 can rotate when connected to the first movable semi-ring 101 or the second movable semi-ring 102 to adjust its levelness.

[0042] In one embodiment, such as Figure 1 , Figure 2 and Figure 3 As shown, the fixing component 2 includes a fixing bracket 201, on which a level 202 is provided. The level 202 is used to determine the levelness of the fixing bracket 201. The high-precision level 202 is directly integrated into the fixing bracket 201, realizing an integrated operation process of "installation-leveling-calibration" in use, without the need for additional tools, which greatly improves the positioning accuracy.

[0043] In one embodiment, such as Figure 1 , Figure 2 and Figure 3 As shown, a fixing box 203 is provided at one end of the fixing bracket 201 away from the bracket assembly 1. The fixing box 203 is detachably connected to the fixing bracket 201, and a radiation source is provided inside the fixing box 203. In this embodiment, a standardized radiation source fixing box 203 design that can be quickly replaced is adopted, which can be compatible with various specifications of calibration sources. At the same time, the safety of the radiation source is ensured by the internal anti-rotation structure and the external locking.

[0044] In this embodiment, considering the high-temperature characteristics of the primary loop piping surface in the high-temperature gas-cooled reactor, a combination of materials with specific coefficients of thermal expansion is selected to avoid structural deformation and positioning misalignment caused by temperature changes. The selected materials in this embodiment include: silicon carbide (SiC) ceramics (which have advantages such as strong radiation resistance and excellent high-temperature performance), boron-containing polyethylene sheets (which have advantages such as lightweight, good toughness, and uniform thermal expansion), and PFA (perfluoroalkoxy resin, which has advantages such as good radiation resistance and uniform thermal expansion).

[0045] In this embodiment, the calibrated pipeline is the inlet pipeline of the high-temperature gas-cooled reactor helium purification system. A 140mm thick lead shielding chamber is provided outside the inlet pipeline. A gamma monitor is installed inside the shielding chamber. The fixing box 203 is located inside the inlet pipeline. The radiation source is a standard gamma radiation source. The fixing box 203 needs to be placed in the same position at fixed intervals for radiation calibration. The gamma monitor measures the radiation to ensure the accuracy and reliability of the monitor during long-term use.

[0046] According to an embodiment of the present invention, another aspect provides a maintenance system including the aforementioned radioactive source fixing device.

[0047] A method of using a radiation source fixation device includes the following steps: (1) Place the γ radiation source inside the fixed box 203 and unscrew the fastening bolts to release the first movable half ring 101 and the second movable half ring 102; (2) The first movable half ring 101 and the second movable half ring 102 are rotated relative to each other by the connector 104, and the inlet of the calibrated pipe is placed into the annular space 105 (that is, the first movable half ring 101 and the second movable half ring 102 are fastened at the inlet of the calibrated pipe), and the first movable half ring 101 and the second movable half ring 102 form an annular structure by the adsorption member 3. (3) The bracket assembly 1 is fitted onto the outer periphery of the pipe to be calibrated by inserting the fixing screw 103 through the first movable half ring 101 and the second movable half ring 102. The fixed bracket 201 with the fixing box 203 is connected to the movable half ring. The end of the fixed bracket 201 away from the movable half ring extends into the pipe to be calibrated. The fixed bracket 201 is leveled using a level 202. After leveling, the measurement is performed.

[0048] The radioactive source fixing device, maintenance system, and method of use provided by this invention have the following advantages: (1) Fix the radioactive source in the predetermined position of the radioactive source bracket. No need for staff to hold it. This allows staff to stay away from the helium purification system inlet pipe and the radioactive source, reducing unnecessary gamma radiation exposure. This is a direct manifestation of the "distance" and "time" principles in the three principles of external radiation protection (ALARA principle: time, distance, shielding), reducing the gamma radiation exposure dose received by staff. (2) Determine the levelness of the radiation source fixing bracket 201 by using the level 202. The distance from the radiation source fixing bracket 201, the edge of the lead shielding chamber to the detector circular hole is consistent, and the spatial relative position of the radiation source and the detector is fixed. (3) Dual-mode fixing mechanism: The first movable half ring 101 and the second movable half ring 102 are combined with magnetic adsorption to form a ring structure, which ensures both convenient installation and absolute stability during use. Even in a vibration environment, it can be accurately positioned. (4) Integrated leveling system: The high-precision level 202 is directly integrated onto the radiation source fixing bracket 201, realizing an integrated operation process of "installation-leveling-calibration" without the need for additional tools, which greatly improves the positioning accuracy; (5) Modular radioactive source fixing structure: The standardized radioactive source fixing box 203 with quick replacement is designed to be compatible with various specifications of calibration sources. At the same time, the internal anti-rotation structure and external locking buckle ensure the safety of the radioactive source. (6) Thermal adaptability material combination: In view of the high temperature characteristics of the primary loop pipe surface of the high temperature gas-cooled reactor, a material combination with a specific thermal expansion coefficient is selected to avoid structural deformation and positioning displacement caused by temperature changes; (7) Ergonomic optimization design: Taking into full account the operational limitations of nuclear power plant operators wearing radiation protection equipment, the shape of the equipment, the size of the knob and the operating torque have been optimized so that the entire installation process can be completed within 3 minutes, minimizing the exposure time of personnel.

[0049] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A device for fixing a radioactive source, characterized in that, include: A support assembly (1) adapted to be connected to the calibrated pipe; A fixing component (2) is connected to the support component (1), the fixing component (2) being at least partially adapted to extend into the calibrated pipe, and the end of the fixing component (2) located in the calibrated pipe is provided with a radiation source.

2. The radioactive source fixing device according to claim 1, characterized in that, The bracket assembly (1) includes a first movable half-ring (101) and a second movable half-ring (102), which are arranged to form a ring. The first movable half-ring (101) and the second movable half-ring (102) are rotatably connected by a connector (104).

3. The radioactive source fixing device according to claim 2, characterized in that, Fixing screws (103) are respectively provided on the first movable half ring (101) and the second movable half ring (102), and the fastening end of the fixing screw (103) is connected to the calibrated pipe.

4. The radioactive source fixing device according to claim 3, characterized in that, The fastening end of the fixing screw (103) extends out of the annular space (105) after passing through the outer peripheral surface of the first movable half ring (101) or the outer peripheral surface of the second movable half ring (102), or the fastening end extends into the annular space (105) after passing through the inner peripheral wall of the first movable half ring (101) or the inner peripheral wall of the second movable half ring (102).

5. The radioactive source fixing device according to claim 4, characterized in that, The first movable semi-ring (101) or the second movable semi-ring (102) is provided with an adsorption element (3), which makes the first movable semi-ring (101) and the second movable semi-ring (102) form a ring structure.

6. The radioactive source fixing device according to claim 4, characterized in that, The fixing component (2) includes a fixing bracket (201), which is disposed on the inner peripheral wall of the first movable half ring (101) or the second movable half ring (102). The length of the fixing bracket (201) is greater than the length of the first movable half ring (101) or the second movable half ring (102).

7. The radioactive source fixing device according to claim 6, characterized in that, The fixed bracket (201) is equipped with a level (202) to determine the levelness of the fixed bracket (201).

8. The radioactive source fixing device according to claim 6, characterized in that, The fixed bracket (201) has a fixed box (203) at one end away from the bracket assembly (1). The fixed box (203) is detachably connected to the fixed bracket (201), and a radiation source is provided inside the fixed box (203).

9. A maintenance system, characterized in that, Includes the radioactive source fixing device as described in any one of claims 1-8.

10. A method of using a radioactive source fixing device, for using the radioactive source fixing device according to claim 1, characterized in that, The support assembly (1) is connected to the calibrated pipe, and the fixing assembly (2) is at least partially adapted to extend into the calibrated pipe to calibrate the radiation value in the calibrated pipe.

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