Device for measuring output quantity of radioactive source

Abstract

The utility model relates to a radioactive source output quantity measuring device which comprises a base, a detector is arranged on the base, a support is arranged on one side of the detector, a linear guide rail is arranged on the support above the detector, a limiting sliding block is arranged on the linear guide rail, and threaded lead screws are arranged on the limiting sliding block far away from one side of the detector and the support. A first synchronous wheel is arranged on the threaded lead screw above the support, a servo motor is arranged on the support on one side of the threaded lead screw, a second synchronous wheel is arranged on the servo motor, a synchronous belt is arranged on the first synchronous wheel and the second synchronous wheel, a supporting frame is arranged on the limiting sliding block, and a supporting block is arranged on the supporting frame above the detector. A ray passing groove is formed in the supporting block, and a radioactive source storage groove is formed in the portion, above the ray passing groove, of the supporting block. Ray intensity measurement can be carried out on the packaged radioactive source. The utility model has the advantages of convenient use and wide market prospect.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of the measurement equipment of ray output, specifically relates to a kind of measurement device of radioactive source output. BACKGROUND

[0002] Radioactive source is made of natural or artificial radioactive nuclide, and the product characterized by emitting certain radiation.Radioactive source can continuously provide radiation with practical significance.The radioactive source used for γ radiation photographic defect detection, radiation therapy, radiation processing and radiation effect research is commonly called radiation source.Special isotope energy is a special form of radioactive source, which can provide heat energy generated by nuclear decay.Radioactive source can be divided into alpha radioactive source, beta radioactive source, gamma radioactive source and neutron source according to the type of released radiation;and can be divided into sealed radioactive source and unsealed radioactive source according to the packaging method of radioactive source.Most of the industrial, agricultural and medical radioactive sources are sealed radioactive sources.Some laboratory radioactive sources with low intensity are unsealed.

[0003] After the completion of the packaging of sealed radioactive source, the radiation released by the radioactive source should be measured quantitatively, so as to complete the final quantification of nuclide.The specific reason is that although the radioactive source is filled with natural or artificial radioactive nuclide with preset mass during packaging, the radiation output of the manufactured radioactive source is measured to determine the loading amount of radioactive material.However, there is no device on the market to measure the radiation output of the packaged radioactive source, which is a technical gap.Therefore, targeted design should be carried out to meet the technical requirement of measuring the radiation intensity of the packaged radioactive source, and to fill the market gap. SUMMARY

[0004] In view of the shortcomings of the prior art, the utility model provides a kind of measurement device that can measure the radiation intensity of the packaged radioactive source, to overcome the defects in the prior art.

[0005] The technical solution adopted by the utility model is: a device for measuring the output of a radioactive source, comprising a base, a detector being provided on the base, a bracket being provided on one side of the detector, a linear guide being provided on the bracket above the detector, the linear guide extending in a direction from close to the detector to away from the detector, a limit slider being provided on the linear guide, the limit slider adopts a block structure capable of sliding along the extension direction of the linear guide, a threaded screw being provided on the limit slider and the bracket on the side away from the detector, the threaded screw adopts a round rod structure capable of rotating around the central axis of the threaded screw, a first synchronous wheel being provided on the threaded screw above the bracket, a servo motor being provided on the bracket on one side of the threaded screw, a second synchronous wheel being provided on the output end of the servo motor, a synchronous belt being provided on the first synchronous wheel and the second synchronous wheel, a support frame being provided on the side of the limit slider close to the detector, a support block being provided on the support frame above the detector, a ray passing groove being provided on the support block, and a radioactive source storage groove being provided on the support block above the ray passing groove.

[0006] Preferably, a rotary encoder is provided on the threaded screw.

[0007] Preferably, the ray passing groove adopts a strip structure, and the ray passing groove extends along the bottom end of the support block toward the top end of the support block. The inner cavity of the radiation source storage groove adopts a cylindrical structure, and the radiation source storage groove extends along the top end of the support block toward the bottom end of the support block. The ray passing groove and the radiation source storage groove are connected.

[0008] Preferably, a first mounting groove is provided on the support frame, and the first mounting groove extends in a direction from close to the detector to away from the detector. The central axis of the first mounting groove, the central axis of the radiation source storage groove and the central axis of the radiation source storage groove are located in the same plane, and a first fixing bolt is provided on the support block outside the first mounting groove and the support frame.

[0009] Preferably, a first mounting bracket is provided on one side of the bracket, a second mounting slot is provided on the first mounting bracket, there are two second mounting slots, both of the two second mounting slots extend in a direction from close to the detector to away from the detector, a first slot-type photoelectric switch is provided on the two second mounting slots, a second slot-type photoelectric switch is provided above the first slot-type photoelectric switch, a second fixing bolt is provided on each second mounting slot and the first slot-type photoelectric switch, and each second mounting slot and the second slot-type photoelectric switch, respectively, and an induction sheet is provided on the side of the limit slider close to the first slot-type photoelectric switch.

[0010] Preferably, a scale layer is provided on the first mounting frame on one side of the two second mounting grooves, and the scale layer extends in a direction from close to the detector to far away from the detector.

[0011] Preferably, a support rod is provided on the base, and the support rod adopts a round rod structure. A sleeve is provided on the support rod, and the sleeve adopts a round tubular structure that can rotate around the central axis of the support rod. A second mounting bracket is provided on the sleeve between the support bracket and the detector, and the second mounting bracket is provided with a third mounting groove. The inner cavity of the third mounting groove adopts a stepped cylindrical structure. A pressure ring is provided on the third mounting groove, and the pressure ring adopts a ring structure. The shape of the pressure ring partially matches the shape of the third mounting groove, and a third fixing bolt is provided on the pressure ring and the second mounting bracket.

[0012] Preferably, a limiting groove is provided on the sleeve, the limiting groove adopts an arc-shaped groove structure, and a limiting rod is provided in the limiting groove.

[0013] The beneficial effects of the utility model are as follows: firstly, the utility model measures the ray intensity of the packaged radioactive source.

[0014] Secondly, the threaded screw of the present invention is provided with a rotary encoder, thereby facilitating feedback of the angular displacement of the threaded screw and indirectly determining the distance moved by the limit slider.

[0015] The utility model has the advantages of simple structure, convenient operation, ingenious design, greatly improved work efficiency, good social and economic benefits, and is a product that is easy to promote and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural diagram of the present utility model.

[0017] Figure 2 for Figure 1 A partially enlarged schematic diagram of detail A.

[0018] Figure 3 It is a structural diagram of the present utility model. DETAILED DESCRIPTION

[0019] like Figures 1 to 3As shown, a kind of radioactive source output measurement device, including base 1, the probe 2 is provided on the base 1, the probe 2 side is provided with support 3, the support 3 above probe 2 is provided with linear guide 4, linear guide 4 extends along the direction close to probe 2 to the direction away from probe 2, limit slider 5 is provided on linear guide 4, limit slider 5 adopts the block structure that can slide along the extension direction of linear guide 4, the limit slider 5 on the side away from probe 2 and the support 3 are provided with threaded lead screw 6, threaded lead screw 6 adopts the circular bar structure that can rotate around the central axis of threaded lead screw 6, first synchronous wheel 7 is provided on threaded lead screw 6 above support 3, servo motor 8 is provided on the side of support 3 of threaded lead screw 6, second synchronous wheel 9 is provided on the output end of servo motor 8, synchronous belt 10 is provided on first synchronous wheel 7 and second synchronous wheel 9, support frame 11 is provided on the side of limit slider 5 close to probe 2, support block 12 is provided on the support frame 11 above probe 2, radiation through slot 13 is formed in support block 12, radioactive source storage tank 14 is provided on the support block 12 above radiation through slot 13.The radiation through slot 13 adopts strip structure, the radiation through slot 13 extends along the bottom end of support block 12 towards the top end of support block 12, the inner cavity of the radioactive source storage tank 14 adopts cylindrical structure, the radioactive source storage tank 14 extends along the top end of support block 12 towards the bottom end of support block 12, and the radiation through slot 13 and the radioactive source storage tank 14 are connected.

[0020] The threaded lead screw 6 is provided with rotary encoder 15, so that the angular displacement of the threaded lead screw 6 can be fed back, and the distance moved by the limit slider 5 can be indirectly judged.

[0021] The support frame 11 is provided with first mounting slot 16, the first mounting slot 16 extends along the direction close to probe 2 to the direction away from probe 2, the central axis of the first mounting slot 16, the central axis of the radioactive source storage tank 14 and the central axis of the radioactive source storage tank 14 are located in the same plane, and the first mounting slot 16 is provided with first fixing bolt 17 outside the support block 12 and the support frame 11.

[0022] A first mounting bracket 18 is provided on one side of the bracket 3. A second mounting slot 19 is provided on the first mounting bracket 18. There are two second mounting slots 19, each extending from close to the detector 2 to away from the detector 2. A first slot-shaped photoelectric switch 20 is provided on each second mounting slot 19. A second slot-shaped photoelectric switch 21 is provided above the first slot-shaped photoelectric switch 20. A second fixing bolt 22 is provided on each second mounting slot 19 and the first slot-shaped photoelectric switch 20, as well as on each second mounting slot 19 and the second slot-shaped photoelectric switch 21. A sensing piece 23 is provided on the side of the limit slider 5 close to the first slot-shaped photoelectric switch 20. The central axis of the inner cavity of the first slot-shaped photoelectric switch 20 and the central axis of the inner cavity of the second slot-shaped photoelectric switch 21 are located in the same plane, and the sensing end of the sensing piece 23 is located in the plane where the central axis of the inner cavity of the second slot-shaped photoelectric switch 21 is located. This facilitates feedback of the minimum position of the radioactive source stored in the radioactive source storage slot 14 from the detector 2 using the first slot-shaped photoelectric switch 20, and feedback of the maximum position of the radioactive source stored in the radioactive source storage slot 14 from the detector 2 using the second slot-shaped photoelectric switch 21. A scale layer 24 is provided on the first mounting bracket 18 on either side of the two second mounting slots 19. The scale layer 24 extends from closer to the detector 2 to farther away from the detector 2. The installation of the scale layer 24 facilitates feedback of the installation positions of the first slot-shaped photoelectric switch 20 and the second slot-shaped photoelectric switch 21.

[0023] The base 1 is provided with a support rod 25, which is a round rod. A sleeve 26 is provided on the support rod 25. The sleeve 26 is a circular tubular structure capable of rotating about the central axis of the support rod 25. A second mounting bracket 27 is provided on the sleeve 26 between the support frame 11 and the detector 2. The second mounting bracket 27 defines a third mounting slot 28, the inner cavity of which is a stepped cylindrical structure. A pressure ring 29 is provided on the third mounting slot 28. The pressure ring 29 is an annular structure, and its shape partially matches that of the third mounting slot 28. A third fixing bolt 30 is provided on the pressure ring 29 and the second mounting bracket 27. This facilitates the installation of a standard object to be measured between the pressure ring 29 and the third mounting slot 28. By rotating the second mounting bracket 27, the standard object to be measured is positioned between the radiation source and the detector 2, thereby further providing feedback on the ability of radiation emitted by the radiation source to penetrate the standard object to be measured. In addition, the sleeve 26 of this product is provided with a limit groove 31, which is an arc-shaped groove structure with an arc of not less than 90 degrees. A limit rod 32 is disposed in the limit groove 31. Thus, the limit groove 31 and the limit rod 32 further limit the movement position of the sleeve 26.

[0024] like Figures 1 to 3As shown, this product is used in a chamber with radiation protection. After the product is installed in the preset position, the pressure ring 29 and the third installation groove 28 are installed with the standard test object, and then the radiation source detection can be carried out. The specific steps include:

[0025] First, the radioactive source to be inspected is placed in the radioactive source storage slot 14; then, the support block 12 loaded with the radioactive source is installed on the support frame 11; then, the servo motor 8 is started, and the servo motor 8 drives the second synchronous wheel 9 and then drives the first synchronous wheel 7 and the threaded screw 6 to rotate accordingly through the synchronous belt 10, thereby driving the limit slider 5 to move upward; then, the rising amplitude of the support frame 11 is judged according to the parameters feedback by the rotary encoder 15 and the position of the support frame 11 on the scale layer 24. When the support frame 11 rises to a preset height, the servo motor 8 is turned off. At this time, the radiation released by the radioactive source installed in the radioactive source storage slot 14 is collimated by the radiation passing slot 13, and then passes through the air between the radiation passing slot 13 and the detector 2 to be detected by the detector 2. The correction coefficient of the radioactive source is given according to the data feedback from the detector 2 and the mass of the nuclide loaded into the radioactive source when it is packaged.

[0026] After completing the above operations, the height of the support frame 11 is maintained unchanged, and the second mounting frame 27 is rotated until the standard object is located between the radiation passage slot 13 and the detector 2. At this time, the radiation released by the radiation source passes through the standard object and is detected by the detector 2. During this process, since some of the radiation is absorbed by the standard object, the radiation that passes through the standard object conforms to the following basic principle: after passing through the object, the radiation intensity will be weakened due to the absorption effect of the object, and this weakening relationship conforms to the attenuation law within a certain range. ; is the intensity of the ray before penetrating the substance; is the intensity of the rays after penetrating the substance; is the mass attenuation coefficient of the material; ρ is the density of the material; d is the thickness of the material; and B is the scattering factor. This provides the radiation reduction data of the radioactive source passing through the standard test object and can also provide feedback on the penetrating ability of the radiation to penetrate the standard test object.

[0027] Through this embodiment, the radiation intensity measurement of the packaged radioactive source is achieved.

[0028] The embodiments described above are only preferred embodiments of the present invention and do not limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made based on the structure, features and principles described in the patent scope of the present invention should be included in the scope of the patent application of the present invention.

Claims

1. A device for measuring the output of a radioactive source, characterized in that: The invention comprises a base (1), wherein a detector (2) is provided on the base (1), a bracket (3) is provided on one side of the detector (2), a linear guide rail (4) is provided on the bracket (3) above the detector (2), the linear guide rail (4) extends in a direction from close to the detector (2) to far away from the detector (2), a limiting slider (5) is provided on the linear guide rail (4), the limiting slider (5) adopts a block structure capable of sliding along the extension direction of the linear guide rail (4), a threaded screw (6) is provided on the limiting slider (5) and the bracket (3) on the side away from the detector (2), and the threaded screw (6) adopts a round rod capable of rotating around the central axis of the threaded screw (6) The invention relates to a structure in which a first synchronous wheel (7) is provided on the threaded screw (6) above the bracket (3), a servo motor (8) is provided on the bracket (3) on one side of the threaded screw (6), a second synchronous wheel (9) is provided on the output end of the servo motor (8), a synchronous belt (10) is provided on the first synchronous wheel (7) and the second synchronous wheel (9), a support frame (11) is provided on the side of the limit slider (5) close to the detector (2), a support block (12) is provided on the support frame (11) above the detector (2), a ray passing slot (13) is provided on the support block (12), and a radioactive source storage slot (14) is provided on the support block (12) above the ray passing slot (13).

2. The device for measuring the output of a radiation source according to claim 1, wherein: The threaded screw (6) is provided with a rotary encoder (15).

3. The device for measuring the output of a radiation source according to claim 1, wherein: The ray passing groove (13) adopts a strip structure, and the ray passing groove (13) extends along the bottom end of the support block (12) toward the top end of the support block (12). The inner cavity of the radioactive source storage groove (14) adopts a cylindrical structure, and the radioactive source storage groove (14) extends along the top end of the support block (12) toward the bottom end of the support block (12). The ray passing groove (13) and the radioactive source storage groove (14) are connected.

4. The device for measuring the output of a radiation source according to claim 3, wherein: A first mounting groove (16) is provided on the support frame (11), and the first mounting groove (16) extends in a direction from close to the detector (2) to away from the detector (2). The central axis of the first mounting groove (16), the central axis of the radioactive source storage groove (14), and the central axis of the radioactive source storage groove (14) are located in the same plane. A first fixing bolt (17) is provided on the support block (12) outside the first mounting groove (16) and the support frame (11).

5. The device for measuring the output of a radiation source according to claim 1, wherein: A first mounting frame (18) is provided on one side of the bracket (3), a second mounting slot (19) is provided on the first mounting frame (18), there are two second mounting slots (19), both of the two second mounting slots (19) extend in a direction from close to the detector (2) to away from the detector (2), a first slot-type photoelectric switch (20) is provided on the two second mounting slots (19), a second slot-type photoelectric switch (21) is provided above the first slot-type photoelectric switch (20), each second mounting slot (19) and the first slot-type photoelectric switch (20) and each second mounting slot (19) and the second slot-type photoelectric switch (21) are respectively provided with a second fixing bolt (22), and a sensing sheet (23) is provided on the side of the limiting slider (5) close to the first slot-type photoelectric switch (20).

6. The device for measuring the output of a radiation source according to claim 5, characterized in that: A scale layer (24) is provided on the first mounting frame (18) on one side of the two second mounting grooves (19), and the scale layer (24) extends in a direction from close to the detector (2) to away from the detector (2).

7. The device for measuring the output of a radiation source according to claim 1, wherein: The base (1) is provided with a support rod (25), which has a round rod structure. The support rod (25) is provided with a sleeve (26), which has a round tube structure capable of rotating around the central axis of the support rod (25). A second mounting frame (27) is provided on the sleeve (26) between the support frame (11) and the detector (2). The second mounting frame (27) is provided with a third mounting groove (28). The inner cavity of the third mounting groove (28) has a stepped cylindrical structure. A pressure ring (29) is provided on the third mounting groove (28). The pressure ring (29) has a ring structure. The shape of the pressure ring (29) partially matches the shape of the third mounting groove (28). A third fixing bolt (30) is provided on the pressure ring (29) and the second mounting frame (27).

8. The device for measuring the output of a radiation source according to claim 7, characterized in that: A limiting groove (31) is provided on the sleeve (26), the limiting groove (31) adopts an arc-shaped groove structure, and a limiting rod (32) is provided in the limiting groove (31).

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