An ionization chamber detection device, measurement system and method of use

Abstract

This invention relates to the field of ionizing radiation detection technology, specifically to an ionization chamber detection device, measurement system, and method of use. An ionization chamber detection device includes: a housing having a receiving space containing a mixed reactive gas; at least one dividing electrode plate disposed within the receiving space, dividing the receiving space into at least two detection chambers; at least two signal collecting electrodes, respectively disposed within different detection chambers; and at least two signal transmission lines, respectively connected to different signal collecting electrodes, each signal transmission line having one end connected to a signal collecting electrode plate and the other end extending outside the housing for connection to a data acquisition and processing unit. This invention provides an ionization chamber detection device, measurement system, and method of use to address the problem that conventional ionization chambers are typically used for measuring the intensity and dose of regional radiation and are not suitable for positional sensitivity detection in spaces smaller than their own sensitive volume.

Description

Technical Field

[0001] This invention relates to the field of ionizing radiation detection technology, specifically to an ionization chamber detection device, measurement system, and method of use. Background Technology

[0002] An ionization chamber is a device used to detect ionizing radiation (such as alpha particles, beta particles, gamma rays, X-rays, etc.). A typical ionization chamber is several tens of centimeters in size and contains a gas-filled cavity. It measures radiation in the direction of a sensitive area through the ionization effect. This structure dictates that conventional ionization chambers are typically used for measuring the intensity and dose of regional radiation and are not suitable for positional sensing of spaces smaller than their own sensitive volume. Summary of the Invention

[0003] In view of this, the present invention provides an ionization chamber detection device, a measurement system, and a method of use to solve the problem that conventional ionization chambers are usually used for intensity and dose measurement of regional radiation, but are not suitable for positional sensitive detection in spaces smaller than their own sensitive volume.

[0004] In a first aspect, the present invention provides an ionization chamber detection device, comprising: A housing having a receiving space containing a mixture of reactive gases; At least one partition plate is disposed within the receiving space, the partition plate dividing the receiving space into at least two detection chambers; At least two signal collecting plates are provided, and the at least two signal collecting plates are respectively arranged in different detection chambers; At least two signal transmission lines are provided, each of which is connected to a different signal collecting electrode. One end of each signal transmission line is connected to the signal collecting electrode, and the other end of each signal transmission line extends out of the housing to be connected to the data acquisition and processing unit.

[0005] Different detection chambers are used to detect the regional radiation intensity and dose in different areas. Each signal collecting electrode in each detection chamber collects ions and generates a current signal. Different signal transmission lines transmit the current signal from each detection chamber to the data acquisition and processing unit. The containment space is divided into different detection chambers by partition plates, so that each detection chamber can independently detect the radiation intensity and dose, which is suitable for sensitive location detection in spaces smaller than its own sensitive volume.

[0006] In one alternative embodiment, one of the detection chambers corresponds to one of the signal collecting plates, one of the signal collecting plates corresponds to one of the signal transmission lines, and the detection chambers are arranged along the length of the housing.

[0007] In one alternative embodiment, the spacing between adjacent separator plates is equal, and the spacing between the signal collecting plate in each detection chamber and the separator plates on both sides is equal.

[0008] In an optional embodiment, a support assembly is further included, the support assembly including a central support shaft and edge support columns, each of the partition plates having a first central hole and each of the signal collection plates having a second central hole, the central support shaft passing through the first central hole and the second central hole respectively to penetrate the receiving space, and the edge support columns being connected to the edges of the partition plates.

[0009] In one optional embodiment, a voltage transmission line is further included, the end of which extends into the receiving space. The voltage transmission line is connected to each of the partition plates. A groove is formed on the outer peripheral wall of the central support shaft, and the groove contains the signal transmission line and the voltage transmission line. Alternatively, the central support shaft has a hollow channel, and the outer peripheral surface of the central support shaft has a plurality of through holes. The signal transmission line extends out of the through holes through the hollow channel and connects to the signal collecting plate. The voltage transmission line extends out of the through holes through the hollow channel and connects to the partition plates.

[0010] In one optional embodiment, the system further includes an isolation assembly comprising a first isolation plate and a second isolation plate, wherein the first isolation plate is disposed between a first end of the housing and the partition plate, and the second isolation plate is disposed between a second end of the housing and the partition plate.

[0011] In one optional embodiment, an insulating sleeve is further included. The insulating sleeve is connected to the first end and is disposed on the side of the first end away from the receiving space. The insulating sleeve has an insulating chamber and an insulating lead-out end is provided in the insulating chamber. The signal transmission line and the voltage transmission line are respectively connected to the insulating lead-out end.

[0012] In one alternative embodiment, the insulating sleeve has an outlet sleeve at the other end away from the housing, and the outlet sleeve has an outlet channel.

[0013] Secondly, the present invention also provides a measurement system including the ionization chamber detection device described above.

[0014] Thirdly, the present invention also provides a method of using an ionization chamber detection device, wherein different detection chambers are used to detect the regional radiation intensity and dose of different areas, each signal collecting plate in each detection chamber collects ions and forms a current signal, and the current signal in each detection chamber is transmitted to the data acquisition and processing unit by different signal transmission lines. Attached Figure Description

[0015] 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.

[0016] Figure 1 This is a schematic diagram of an ionization chamber detection device according to an embodiment of the present invention; Figure 2 This is a front view of an ionization chamber detection device according to an embodiment of the present invention; Figure 3 This is a flowchart illustrating the method of using the measurement system according to an embodiment of the present invention.

[0017] Explanation of reference numerals in the attached drawings: 1. Housing; 2. Separating electrode plate; 3. Signal collection electrode plate; 4. Detection chamber; 5. Central support shaft; 6. Edge support column; 7. First isolation plate; 8. Second isolation plate; 9. Adsorption plate; 10. Insulating adapter end cover; 11. Insulating sleeve; 12. Insulating chamber; 13. Second end; 14. Insulating lead-out end; 15. Signal line connector; 16. Lead-out sleeve; 17. Voltage line connector; 18. Fixing block; 19. IV converter; 20. Analog-to-digital converter; 21. Data acquisition and processing unit; 22. High voltage power supply; 23. Onboard power supply; 24. Communication port; 25. Aviation plug; 26. Bellows; 27. Insertion sleeve. Detailed Implementation

[0018] 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.

[0019] The following is combined Figures 1 to 3 The following describes embodiments of the present invention.

[0020] According to an embodiment of the present invention, an ionization chamber detection device is provided, comprising: a housing 1 having a receiving space containing a mixed reactive gas; at least one dividing electrode 2 disposed within the receiving space, the dividing electrode 2 dividing the receiving space into at least two detection chambers 4; at least two signal collecting electrodes 3 respectively disposed within different detection chambers 4; at least two signal transmission lines respectively connected to different signal collecting electrodes 3, one end of each signal transmission line being connected to a signal collecting electrode 3, and the other end of each signal transmission line extending outside the housing 1 for connection to a data acquisition and processing unit 21.

[0021] Different detection chambers 4 are used to detect the regional radiation intensity and dose in different areas. Each signal collecting electrode 3 in each detection chamber 4 collects ions and forms a current signal. The current signal in each detection chamber 4 is transmitted to the data acquisition and processing unit 21 through different signal transmission lines. The containment space is divided into different detection chambers 4 by the partition electrode 2, so that each detection chamber 4 can independently detect the radiation intensity and dose, which is suitable for positional sensitive detection of spaces smaller than its own sensitive volume. In this embodiment, the mixed reaction gas inside the containment space is an argon-helium mixture, the filling pressure is 1MPa, the mixing ratio is 1:1, and the measurement range reaches 50mGy-500Gy / h. It should be noted that the detection chambers 4 in this embodiment are 10 sections with 11 partition electrodes 2, that is, two adjacent detection chambers 4 share one partition electrode 2.

[0022] In one embodiment, such as Figure 1 , Figure 2 As shown, each detection chamber 4 corresponds to a signal collecting electrode 3, and each signal collecting electrode 3 corresponds to a signal transmission line. The detection chambers 4 are arranged along the length of the housing 1. Each detection chamber 4 can independently detect the radiation value of the target area. The signal collecting electrode 3 collects the radiation signal from the corresponding detection chamber 4, and the signal is transmitted to the outside of the housing 1 by the signal transmission line, thereby effectively improving the detection sensitivity in a small area within the entire housing 1.

[0023] In one embodiment, such as Figure 1 , Figure 2 As shown, the spacing between adjacent separator plates 2 is equal, and the spacing between the signal collecting plate 3 in each detection chamber 4 and the separator plates 2 on both sides is equal. The equal spacing between adjacent separator plates 2 forms detection chambers 4 of different lengths. The equal spacing between the signal collecting plate 3 in each detection chamber 4 and the separator plates 2 on both sides means that the signal collecting plate 3 in the same detection chamber 4 is located in the middle position between the two separator plates 2, so as to collect the radiation signal in the detection chamber 4 to the maximum extent and ensure the accuracy of detection.

[0024] In one embodiment, such as Figure 1 , Figure 2 As shown, it also includes a support assembly, which includes a central support shaft 5 and edge support posts 6. Each partition plate 2 has a first central hole, and each signal collecting plate 3 has a second central hole. The central support shaft 5 passes through the first central hole and the second central hole to penetrate the receiving space. The edge support posts 6 are connected to the edges of the partition plates 2. In this embodiment, the diameters of the first central hole and the second central hole are equal. This application does not specifically limit the connection method between the central support shaft 5 and the first central hole and the second central hole. This application preferably uses welding, but it can also use other methods such as plug-in or snap-fit. In this embodiment, as... Figure 1 , Figure 2 As shown, the diameter of the signal collecting electrode 3 is smaller than the diameter of the separating electrode 2. The edge support column 6 is connected to the edge of the edge electrode, but not to the signal collecting electrode 3. The separating electrode 2 and the signal collecting electrode 3 are fixed by the central support shaft 5 and the edge support column 6.

[0025] In one embodiment, such as Figure 1 , Figure 2 As shown, it also includes voltage transmission lines, the ends of which extend into the receiving space. The voltage transmission lines are connected to each of the separating electrode plates 2. A groove is formed on the outer peripheral wall of the central support shaft 5, and the groove contains the signal transmission lines and voltage transmission lines. In this application, the groove is arranged along the length of the central support shaft 5, and the signal transmission lines and voltage transmission lines pass through the groove to ensure that each transmission line is insulated from the others. Each signal transmission line outputs a collection signal at its corresponding position. To facilitate fixing the signal collection electrode plate 3 and the separating electrode plate 2, as shown... Figure 2 As shown, a plug-in sleeve 27 is also fitted around the outer periphery of the central support shaft 5. The outer surface of the plug-in sleeve 27 has several grooves, into which signal collecting plates 3 and separating plates 2 are sequentially and alternately placed to ensure the fixed positions of the signal collecting plates 3 and separating plates 2 and prevent them from swaying arbitrarily. In this embodiment, the signal collecting plates 3 and separating plates 2 are fixedly connected to the plug-in sleeve 27 by welding.

[0026] In one embodiment, such as Figure 1 , Figure 2As shown, the device also includes an isolation assembly, which comprises a first isolation plate 7 and a second isolation plate 8. The first isolation plate 7 is disposed between the first end of the housing 1 and the partition plate 2, and the second isolation plate 8 is disposed between the second end 13 of the housing 1 and the partition plate 2. The first isolation plate 7 and the second isolation plate 8 serve to isolate the internal detection chamber 4 from other factors. It should be noted that in this embodiment, an adsorption plate 9 is provided between the second end 13 and the second isolation plate 8. The adsorption plate 9 is a magnetic plate, used to position and fix the detection device when it passes through the pipe during detection.

[0027] In one embodiment, such as Figure 1 , Figure 2 As shown, it also includes an insulating sleeve 11, which is connected to the first end. The insulating sleeve 11 is located on the side of the first end away from the receiving space. The insulating sleeve 11 has an insulating chamber 12, and an insulating lead-out end 14 is provided in the insulating chamber 12. The signal transmission line and voltage transmission line are respectively connected to the insulating lead-out end 14. In this application, the insulating sleeve 11 is composed of two semi-annular structures, which are used to weld and fix the insulating adapter end cover 10 to the signal transmission line and voltage transmission line led out from the receiving space. After fixing, the signal line connector 15 and voltage line connector 17 are respectively fixed to the insulating lead-out end 14 on the insulating adapter end cover 10 to ensure that the connectors are relatively fixed. The notch between the two semi-annular structures is used for welding operations. It should be noted that in this application, there are 11 insulated leads 14, one located at the center and the remaining ten arranged in a ring around the center. Each end of a ring-shaped insulated lead 14 corresponds to a signal transmission line and a signal line connector 15, respectively; or each end of the insulated lead 14 located at the center corresponds to a voltage transmission line or a voltage line connector 17. It should also be noted that the insulated leads 14 are made of ceramic, with an insulated surface and a conductor core to enable signal transmission.

[0028] In one embodiment, such as Figure 1 , Figure 2 As shown, the insulating sleeve 11 has a lead-out sleeve 16 at the end away from the housing 1. The lead-out sleeve 16 has a lead-out channel to allow the transmission line to extend to the outside. It should be noted that, as... Figure 1 As shown, a fixing block 18 is provided inside the lead-out sleeve 16, which is used to fix the signal transmission line and the voltage transmission line respectively.

[0029] According to an embodiment of the present invention, on the other hand, such as Figure 3As shown, a measurement system is also provided, including the ionization chamber detection device described above, and also including an onboard power supply 23, a flight plug 25, a data acquisition and processing unit 21, a communication port 24, an IV converter 19 and an analog-to-digital converter 20, wherein each detection chamber 4 corresponds to one IV converter 19 and one analog-to-digital converter 20.

[0030] A method of using an ionization chamber detection device includes the following steps: (1) The separator plate 2 obtains high voltage from the high voltage power supply 22 through the voltage transmission line. The high voltage power supply 22 is provided by the onboard power supply 23 (the external power supply supplies 12V to the onboard power supply 23 through the aviation plug 25, and the onboard power supply 23 distributes the power supply to the high voltage power supply 22 that supplies 1000V high voltage to the multi-section detection chamber 4). (2) When external radiation irradiates the ionization chamber detection device, the mixed reaction gas inside the ionization chamber detection device undergoes an ionization effect, and ions are collected by each signal collecting electrode 3 in each detection chamber 4 to form a current signal. (3) The current signal is transmitted through the signal transmission line to the initial current signal corresponding to the detection chamber 4 and output to each IV converter 19 (one detection chamber 4 corresponds to one signal transmission line, and one signal transmission line corresponds to one IV converter 19). The IV converter 19 converts the current signal of each detection chamber 4 into a voltage signal and then outputs it to each corresponding analog-to-digital converter 20. (4) The analog-to-digital converter 20 converts the voltage signal into a digital quantity and then outputs it to the data acquisition and processing unit 21. The data acquisition and processing unit 21 collects and summarizes the digital signals of each analog-to-digital converter 20, converts the ten sets of digital signals into a dose rate signal, and realizes signal transmission with external devices through the communication port 24 and the connector 25.

[0031] In this embodiment, both the signal transmission line and the voltage transmission line use radiation-resistant triaxial shielded cables. These cables have strong radiation resistance, with a high-strength copper alloy conductor and cross-linked polyethylene insulation, providing strong anti-interference capabilities and withstanding a cumulative dose of 1×10⁻⁶. 6 Cumulative radiation exposure to Gy.

[0032] In this embodiment, the housing 1, insulating sleeve 11, and lead-out sleeve 16 are all made of 316 stainless steel. The separator plate 2 and signal collection plate 3 are made of aluminum alloy. The central support shaft 5, the first isolation plate 7, the second isolation plate 8, and the edge support column 6 are all made of high-temperature resistant and radiation-resistant polyetheretherketone (PEEK) material, capable of withstanding 1×10⁻⁶ ppm. 6 The cumulative dose of Gy irradiation resulted in a volume resistivity as high as 10⁻⁶. 16 Ω·cm.

[0033] In this embodiment, the connection between the housing 1 and the insulating sleeve 11, and the connection between the insulating sleeve 11 and the lead-out sleeve 16, are sealed with radiation-resistant rubber O-rings and then welded; the signal transmission line and the voltage transmission line are integrally welded to the insulating lead-out end 14; when it needs to extend outward, the bellows 26 is fitted on, and the connection between the bellows 26 and the lead-out sleeve 16 is sealed with radiation-resistant rubber O-rings and then welded. The above sealing method enables the dustproof and waterproof capability of the ionization chamber detection device to reach IP68.

[0034] The ionization chamber detection device provided by the present invention has the following advantages: (1) Different detection chambers 4 are used to detect the regional radiation intensity and dose of different areas. Each signal collecting electrode 3 in each detection chamber 4 collects ions and forms a current signal. The current signal in each detection chamber 4 is transmitted to the data acquisition and processing unit 21 by different signal transmission lines. The space is divided into different detection chambers 4 by the dividing electrode 2, so that each detection chamber 4 can independently detect the radiation intensity and dose, which is suitable for positional sensitive detection in spaces smaller than its own sensitive volume; (2) Multiple sets of IV converters 19 and analog-to-digital converters 20 are provided, which can directly reflect the specific values; (3) Adsorption plates 9 are provided for positioning and fixing when the detection device is inserted into the pipe during detection.

[0035] As an alternative implementation, the central support shaft 5 is provided with a hollow channel, and the outer circumferential surface of the central support shaft 5 is provided with several through holes. The signal transmission line extends out of the through holes through the hollow channel and is connected to the signal collection electrode plate 3. The voltage transmission line extends out of the through holes through the hollow channel and is connected to the separator electrode plate 2.

[0036] As an alternative implementation, the number of detection chambers 4 can be 2, 3, 4, 5 or even more.

[0037] 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. An ionization chamber detection device, characterized in that, include: The housing (1) has a receiving space containing a mixture of reactive gases; At least one partition plate (2) is disposed in the receiving space, the partition plate (2) dividing the receiving space into at least two detection chambers (4). At least two signal collecting plates (3) are arranged in different detection chambers (4); At least two signal transmission lines are connected to different signal collection plates (3) respectively. One end of each signal transmission line is connected to the signal collection plate (3), and the other end of each signal transmission line extends out of the housing (1) to be connected to the data acquisition and processing unit (21). It also includes a support assembly, which includes a central support shaft (5) and an edge support column (6). Each of the partition plates (2) is provided with a first central hole, and each of the signal collection plates (3) is provided with a second central hole. The central support shaft (5) passes through the first central hole and the second central hole respectively to penetrate the accommodating space. The edge support column (6) is connected to the edge of the partition plate (2). It also includes voltage transmission lines, the ends of which extend into the receiving space. The voltage transmission lines are connected to each of the partition plates (2). The outer peripheral wall of the central support shaft (5) is provided with a groove, which contains the signal transmission lines and the voltage transmission lines. Alternatively, the central support shaft (5) is provided with a hollow channel, and the outer peripheral surface of the central support shaft (5) is provided with several through holes. The signal transmission lines extend out of the through holes through the hollow channel and are connected to the signal collecting plate (3). The voltage transmission lines extend out of the through holes through the hollow channel and are connected to the partition plates (2).

2. The ionization chamber detection device according to claim 1, characterized in that, One of the detection chambers (4) corresponds to one of the signal collection plates (3), and one of the signal collection plates (3) corresponds to one of the signal transmission lines. The detection chambers (4) are arranged along the length direction of the housing (1).

3. The ionization chamber detection device according to claim 2, characterized in that, The spacing between adjacent separator plates (2) is equal, and the spacing between the signal collection plate (3) in each detection chamber (4) and the separator plates (2) on both sides is equal.

4. The ionization chamber detection device according to claim 3, characterized in that, It also includes an isolation component, which includes a first isolation plate (7) and a second isolation plate (8). The first isolation plate (7) is disposed between the first end of the housing (1) and the partition plate (2), and the second isolation plate (8) is disposed between the second end (13) of the housing (1) and the partition plate (2).

5. The ionization chamber detection device according to claim 4, characterized in that, It also includes an insulating sleeve (11), which is connected to the first end. The insulating sleeve (11) is located on the side of the first end away from the accommodating space. The insulating sleeve (11) is provided with an insulating chamber (12). An insulating lead-out end (14) is provided in the insulating chamber (12). The signal transmission line and the voltage transmission line are respectively connected to the insulating lead-out end (14).

6. The ionization chamber detection device according to claim 5, characterized in that, The insulating sleeve (11) is provided with an outlet sleeve (16) at the other end away from the housing (1), and the outlet sleeve (16) has an outlet channel.

7. A measurement system, characterized in that, Includes the ionization chamber detection device according to any one of claims 1-6.

8. A method of using an ionization chamber detection device, for using the ionization chamber detection device according to claim 1, characterized in that, Different detection chambers (4) are used to detect the regional radiation intensity and dose of different areas. Each signal collection plate (3) in each detection chamber (4) collects ions and forms a current signal. The current signal in each detection chamber (4) is transmitted to the data acquisition and processing unit (21) by different signal transmission lines.

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