WO2023128637A1

WO2023128637A1 - Radiation detection device with changeable electrode spacing

Info

Publication number: WO2023128637A1
Application number: PCT/KR2022/021567
Authority: WO
Inventors: 양태건; 최상현; 강건욱; 김정환; 안동현; 장홍석; 황원택; 김근범; 김금배
Original assignee: 한국원자력의학원
Priority date: 2021-12-30
Filing date: 2022-12-29
Publication date: 2023-07-06
Also published as: KR20230102874A; KR102665268B1

Abstract

A radiation detection device according to an embodiment disclosed in the present document comprises: a first frame having a first electrode on one surface thereof; a second frame having a second electrode that is on one surface thereof and faces the first electrode, the second frame being spaced apart from the first frame in a first axial direction; a driving module connected to the second frame and configured to move the second frame relative to the first frame in the first axial direction; and a side cover connecting the first frame to the second frame and surrounding a space between the first frame and the second frame to seal the space, wherein the side cover may form an ion chamber between the first frame and the second frame, in which the first electrode and the second electrode are accommodated and gas is filled, and may be formed stretchable along the first axis. Various other embodiments identified through the specification may be possible.

Description

Radiation detection device capable of changing electrode spacing

Various embodiments disclosed in this document are radiation detection devices for measuring in real time the intensity of radiation at various dose rates, including ultra-high dose rates. Specifically, the radiation detection device according to the embodiments disclosed in this document includes electrodes facing each other in parallel to form a closed ion chamber in which gas ionization by radiation occurs, and depending on the type and intensity of radiation, By changing the gap between the electrodes, the ion recombination effect is effectively prevented, and the intensity of the radiation is precisely measured.

With the development of treatment technologies using ultra-high dose rate radiation, such as flash therapy, in relation to the treatment of diseases such as cancer, it has become more important to ensure quantitative exposure required for the safety of patients. In this regard, a technique for measuring and precisely controlling the amount of radiation, an irradiated area, an irradiation time, and the like in real time is becoming important. In order to monitor radiation in real time, an electrical meter using radiation-induced ionization (or “ionization”) of a gas, a scintillation detector using fluorescence, and the like are generally utilized. For monitoring of a medical radiation generator, a parallel plate type ionization chamber (or "ion chamber") as disclosed in Patent Document 1 (Korean Patent Registration No. 10-1800753) is used as a standard.

When measuring high dose rate radiation, an ion recombination phenomenon in which ion pairs of ionized gas in the ion chamber recombine may occur. Since this phenomenon greatly hinders measurement accuracy, in order to prevent this phenomenon, a method of lowering the density of gas in an ion chamber having the same volume or reducing the volume of the ion chamber is performed. Among them, the method of reducing the volume of the ion chamber can be effectively implemented through a structure capable of adjusting the distance between a pair of electrodes, as in the embodiments disclosed in this document.

Conventionally, in order to remove factors that hinder measurement accuracy, such as ion recombination, measurements have been performed by selecting an ion chamber having an appropriate electrode spacing according to a type of radiation or a dose rate. However, in this case, since a plurality of ion chambers having different electrode spacings must be provided, economic feasibility is poor, and it is inefficient to replace the ion chamber with a suitable ion chamber according to the type and dose rate of radiation. Recently, as the utilization of ultra-high dose rate radiation with a further increased dose rate has increased significantly, the need for an improved technology to solve the above-described problems of the prior art has increased.

The present invention was developed to overcome the above limitations of the prior art, and the present invention can change the distance between parallel electrodes provided in the ion chamber to suit the type and intensity of radiation to be measured. An object of the present invention is to provide a radiation detection device capable of ensuring high measurement accuracy by maintaining the airtightness of an ion chamber filled with gas before and after maintaining electrode parallelism.

A radiation detection device according to an embodiment disclosed in this document includes a first frame having a first electrode on one surface; a second frame provided with a second electrode facing the first electrode on one surface and spaced apart from the first frame in a first axial direction; a drive module connected to the second frame and configured to move the second frame relative to the first frame in the first axial direction; and a side cover connecting the first frame and the second frame and surrounding the space to seal a space between the first frame and the second frame, wherein the side cover includes the first frame and the second frame. An ion chamber in which the first electrode and the second electrode are accommodated and filled with gas may be formed between two frames, and may be formed to be stretchable along the first axis.

According to the radiation detection apparatus of various embodiments disclosed in this document, it is not necessary to have an ion chamber having an appropriate electrode spacing for each type of radiation to be measured and for each dose rate, so cost is reduced and efficiency of the measurement work is improved. there is In particular, in the case of measuring ultra-high dose rate radiation, the recombination phenomenon can be prevented by reducing the electrode spacing compared to the case of measuring general radiation, thereby increasing measurement accuracy.

In addition, according to the radiation detection apparatus of various embodiments disclosed in this document, electrode parallelism can be monitored and corrected in real time before and after changing the electrode spacing by measuring the electrode spacing at various positions of the electrode using a displacement sensor, thereby enabling radiation detection. Measurement precision and reliability can be greatly improved.

1 is a perspective view of a radiation detection device according to an embodiment disclosed in this document.

FIG. 2 is a perspective view of the radiation detection device of FIG. 1 viewed from another direction.

3 is an exploded perspective view of a radiation detection device according to an exemplary embodiment.

4 is a side view of a radiation detection device according to an exemplary embodiment, showing a state when measuring general radiation.

Figure 5 is a cross-sectional side view of Figure 4;

6 is a side view of a radiation detection device according to an exemplary embodiment, showing a state when radiation of a high dose rate is measured.

7 is a cross-sectional side view of FIG. 6 .

In connection with the description of the drawings, the same or similar reference numerals may be used for the same or similar elements.

This application claims priority based on Korean Patent Application No. 10-2021-0193329 filed on December 30, 2021, and all contents disclosed in the specification and drawings of the application are incorporated into this application.

Hereinafter, various embodiments of the present invention will be described with reference to the accompanying drawings. However, it should be understood that this is not intended to limit the present invention to the specific embodiments, but to cover various modifications, equivalents and/or alternatives of the embodiments of the present invention.

Throughout this document, the term "first axis" refers to an axis in which the first electrode and the second electrode are arranged side by side and an axis in which the distance between the first electrode and the second electrode (hereinafter referred to as "electrode distance") increases or decreases. and is indicated by the line X in the drawing.

A radiation detection device according to various embodiments disclosed in this document is used in, for example, a medical radiation generating device such as a linear accelerator to generate various types of photon beams such as X-rays and gamma rays, particle beams such as neutron beams and proton beams, and electron beams. It is for measuring the intensity of radiation in real time. In particular, the radiation detection device measures not only radiation used in general radiation therapy (eg, 0.03 to 0.4 Gy per second) (hereinafter referred to as “general radiation”), but also ultra-high dose rate radiation (eg, 40 Gy or more per second) by changing the electrode spacing. possible.

1 is a perspective view of a radiation detection apparatus 100 according to an exemplary embodiment. FIG. 2 is a perspective view of the radiation detection device 100 of FIG. 1 viewed from another direction. 3 is an exploded perspective view of the radiation detection device 100 according to an exemplary embodiment.

Referring to FIGS. 1, 2, and 3 , a radiation detection apparatus 100 according to an embodiment includes a first frame 1 and a first frame 1 disposed spaced apart from the first frame 1 on a first axis X. 2 frames 2, a side cover 3 disposed between the first frame 1 and the second frame 2 and connecting the first frame 1 and the second frame 2, and the second frame ( 2) may include a driving module 5 that is connected to and moves the second frame 2 in the first axis X direction.

In addition, referring to FIGS. 1, 2 and 3, the drive module 5 is connected to a housing 50 in which a motor (not shown in the drawing) is housed therein, and one end thereof is connected to the motor The other end may include a moving shaft 51 connected to the second frame 2 . In various embodiments, the radiation detection apparatus 100 may further include a control module (not shown) for controlling the operation of the driving module 5 . In addition, in the radiation detection device 100 according to an exemplary embodiment, in an exemplary embodiment, the base module 4 is fitted to the flat base 40, the rail 49, and the rail 49 by engaging with each other. It may include a base module (4) comprising a top (45) and a slider (46).

In one embodiment, the first frame 1 and the second frame 2 may be formed in a shape in which at least a portion passes along the first axis X. For example, the first frame 1 and the second frame 2 may have a predetermined thickness in the direction of the first axis X, and an opening may be formed at a central portion. In the illustrated embodiment, the first frame 1 and the second frame 2 have a rectangular shape, but the shapes of the first frame 1 and the second frame 2 are not limited thereto, and may have various shapes such as a circle. can be formed The first frame 1 and the second frame 2 may be made of an insulating material.

In one embodiment, the first frame 1 is provided with a first window 11 on one side of both surfaces facing the first axis (X) direction, and the first electrode 10 is provided on the opposite side of the one side. may be provided. For example, the surface on which the first electrode 10 is provided may be a surface facing the second frame 2 among both surfaces of the first frame 1 . In one embodiment, the first window 11 and the first electrode 10 are arranged (or coupled) on both sides of the first frame 1 to be spaced apart at a predetermined interval along the first axis (X) direction. can

In one embodiment, the second frame 2 is provided with a second window 21 on one side of both surfaces facing the first axis (X) direction, and a second electrode 20 on the opposite side of the one side. may be provided. For example, the surface on which the second electrode 20 is provided may be a surface facing the first frame 1 among both surfaces of the second frame 2 . In one embodiment, the second window 21 and the second electrode 20 are disposed (or coupled) on both sides of the second frame 2 so as to be spaced apart at a predetermined interval along the first axis (X) direction. can

In one embodiment, the first frame 1 and the second frame 2 may be configured such that one moves relative to the other in the direction of the first axis (X). For example, the first frame 1 is relatively fixed, and the second frame 2 may move closer to or farther from the first frame 1 by moving in the direction of the first axis X. Accordingly, the distance between the first electrode 10 coupled to the first frame 1 and the second electrode 20 coupled to the second frame 2 (electrode spacing) may change. According to the illustrated embodiment, the radiation measuring apparatus 100 is implemented in a structure in which the second frame 2 moves, but in various embodiments, the radiation measuring apparatus 100 has the second frame 2 fixed, The first frame 1 may be provided in a structure in which the second frame 2 moves relatively. For example, the driving module 5 may be connected to the first frame 1 and configured to move the first frame 1 in the first axis X direction.

In one embodiment, the first window 11 and the second window 21 are plate-shaped members and may be formed of an insulating material. In various embodiments, at least some regions of the first window 11 and the second window 21 may be transparent or opaque, and may be provided in plural numbers.

In one embodiment, the first electrode 10 and the second electrode 20 may be formed by depositing multiple layers of a conductive material on a substrate having a shape such as a square or a circle. In the illustrated embodiment, the first electrode 10 is an electrode that is negatively charged and to which a high voltage is applied to generate a high voltage electric field between the first electrode 10 and the second electrode 20 (hereinafter "cathode"). can The second electrode 20 may be an electrode (hereinafter referred to as “anode”) that is positively charged and collects electrons generated by gas ionization. Conversely, in various embodiments, it is also possible that the first electrode 10 is an anode and the second electrode 20 is a cathode.

In an embodiment, the radiation detection apparatus 100 may measure a change in current at an anode where electrons are collected, and calculate the amount of electrons generated due to ionization and the amount of irradiated radiation from the measured value. The voltage applied to the first electrode 10 and the second electrode 20 may be a value corresponding to an ionization region, which is a region in which the amount of collected electrons is kept constant when the intensity of the irradiated radiation is constant. there is.

Hereinafter, the side cover 3 forming the ion chamber (eg, the ion chamber 30 of FIGS. 5 and 7) inside will be described.

In various embodiments, the side cover 3 may be disposed between the first frame 1 and the second frame 2 . The first frame 1 and the second frame 2 may be connected to each other by a side cover 3. The side cover 3 seals a space between the first frame 1 and the second frame 2 to form an ion chamber 30 , which is a space in which gas ionization occurs. The inside of the ion chamber 30 may accommodate the first electrode 10 and the second electrode 20 and be filled with gas. Radiation may be incident into the ion chamber 30 from the outside through the first window 11 and the first electrode 10 or through the second window 21 and the second electrode 20 . The gas filled in the ion chamber 30 may be, for example, an inert gas, an inert gas, or air.

In various embodiments, the side cover 3 may change in shape or length in the first axis X direction when the first frame 1 and the second frame 2 move closer or farther apart. For example, when the side cover 3 moves toward or away from the first frame 1 when the second frame 2 relative to the first frame 1, the first axis It may be formed so that the volume of the ion chamber 30 inside the side cover 3 is changed by being stretched in the (X) direction.

In one embodiment, the side cover 3 may be formed in a structure that can be folded or unfolded in at least a portion of the first axis (X) direction. Specifically, the radiation detection device 100 may increase the volume of the ion chamber 30 as the side cover 3 is unfolded when measuring general radiation, and when measuring ultra-high dose rate radiation, the side cover ( 3) The volume of the ion chamber 30 can be reduced as it is folded.

In the embodiment shown in the drawings, the side cover 3 may be formed in a bellows structure. However, the shape of the side cover 3 is not limited to the illustrated example, and the side cover 3 includes the first electrode 10 (eg, the first frame 1) and the second electrode 20 (eg, the first frame 1). In response to the change in the distance between the second frames 2, it can be implemented in various materials and/or shapes that can be stretched along the first axis (X) direction. In various embodiments, the side cover 3 may be formed using an elastic material. The side cover 3 is preferably made of an insulating material.

In various embodiments, both ends of the side cover 3 on the first axis X may be closely connected to surfaces of the first frame 1 and the second frame 2 adjacent to each other. That is, the side cover 3 may be formed to maintain a sealed state of the ion chamber 30 filled with gas when the electrode spacing is changed.

In one embodiment, at least one end of both ends of the side cover 3 may be further provided with a sealing member (not shown). As an example, the sealing member may be installed on the inside or outside of the end of the side cover 3, and the fixing force of the connection between the end of the side cover 3 and the first frame 1 or the second frame 2 and Confidentiality can be improved.

In one embodiment, the radiation detection device 100 may include an electronic component 13 electrically connected to at least one of the first electrode 10 and the second electrode 20 . In one embodiment, a board 12 electrically connected to at least one of the first electrode 10 or the second electrode 20 is mounted on the edge of the first frame 1 or the second frame 2, The electronic component 13 may be coupled on the board 12 and electrically connected to the board 12 . As shown in FIG. 3 , the board 12 may be formed with an opening formed in the center so that radiation irradiated from the outside is incident into the ion chamber 30 without contacting the board 12 .

Hereinafter, the first electrode 10 as a configuration for measuring the intensity of radiation. The second electrode 20 and the electronic component 13 are described.

In one embodiment, the electronic component 13 may be installed on a board 12 mounted around the first frame 1 outside of the ion chamber 30 . In one embodiment, the electronic component 13 may be configured to measure a current change amount generated when electrons of the ionized gas are collected at an anode and collect current change amount data. In one embodiment, the electronic component 13 may communicate with the control module of the radiation detection device 100 by wire or wirelessly, and transfer current variation data to the control module. In this case, the intensity of the radiation may be calculated from the current variation data received by the control module.

In another embodiment, the electronic component 13 may be a current-frequency converter that converts the amount of current change into a digital signal and transmits it to the control module. In one embodiment, the electronic component 13 may calculate the amount of radiation from the measured amount of current change and transmit the amount of radiation data to the control module. In another embodiment, the electronic component 13 may include a connector for electrically connecting a meter provided outside the radiation detection device 100 to measure a change in current and an anode.

In one embodiment, an external device such as a PC that communicates with the control module wirelessly or wired to receive data may be provided outside the radiation detection apparatus 100 . In this case, the final calculation and correction regarding the intensity of the radiation may be performed by the software of the external device. The above configurations are only examples of configurations for measuring radiation dose from electrons collected in the first electrode 10, but are not limited thereto.

In one embodiment, the electronic component 13 may be electrically connected to at least one of the first electrode 10 and the second electrode 20 to supply power. In this case, one of the first electrode 10 or the second electrode 20 is charged as a negative electrode and the other electrode is charged as a positive electrode, and a high voltage is applied to the negative electrode so that the first electrode 10 and the second electrode 20 are charged. A high-voltage electric field can be formed between them. In one embodiment, the first electrode 10 or the second electrode 20 may be connected to a power source through a separate member rather than a connector.

FIG. 4 is a side view of the radiation detection device 100 according to an embodiment, generally showing a state when radiation is measured. Figure 5 is a cross-sectional side view of Figure 4; 6 is a side view of the radiation detection device 100 according to an embodiment, showing a state when radiation of a high dose rate is measured. 7 is a cross-sectional side view of FIG. 6 .

5 and 7 show cross-sections along the line A-A shown in FIG. 1 . The electrode spacings shown in FIGS. 4 to 7 are illustrative, and the scale may not match the actual electrode spacing.

Referring to FIGS. 5 and 7 , in the radiation measuring device 100, the second electrode spacing d2 when measuring ultra-high dose radiation is narrower than the first electrode spacing d1 when measuring general radiation, and When measuring the dose radiation, the volume of the ion chamber 30 may be relatively small. In this regard, when measuring ultra-high dose rate radiation, an ion recombination phenomenon in which gas ion pairs that have been ionized in the ion chamber 30 are recombined increases, and the number of electrons reaching the anode may decrease. In this case, FIGS. 6 and 7 As shown in , when the volume of the ion chamber 30 is reduced, the number of recombination ions is reduced, thereby improving the accuracy of measurement values.

The radiation measuring device 100 according to the present invention is in a first state (or basic state) in which the electrode interval is the first interval d1 based on at least one of the type of radiation and the dose rate (eg, as shown in FIGS. 4 and 5 ). state) and a second state (or reduced state) in which the electrode interval is the second interval d2 (eg, the state of FIGS. 6 and 7 ). However, it can be understood that the above-described first state and second state arbitrarily define two states in which the size of the ion chamber 30 is different from each other, and the state of the radiation measuring device 100 is limited to the two states shown. It is not. For example, the radiation measuring apparatus 100 may be modified into a state in which the electrode spacing is smaller than the first electrode spacing d1 and larger than the second electrode spacing d2.

Hereinafter, the configuration of the base module 4 will be described. In one embodiment, the base module 4 has a base 40, a rail 49 mounted on an upper surface of the base 40, a lower part mounted on the rails 49 and an upper part mounted on the first frame 1 The connected fixing part 45 and the lower part may include a slider 46 mounted on the rail 49 and the upper part connected to the second frame 2 .

In one embodiment, base 40 may be a member in the form of a flat plate. In one embodiment, the rail 49 is formed to extend in the first axis (X) direction, and may be disposed on the base 40 . At least one of the first frame 1 and the second frame 2 mounted perpendicularly to the rail 49 on the upper portion of the rail 49 is linear in the first axis X direction along the rail 49. I can guide you on the move. As in the illustrated embodiment, the two rails 49 may be spaced apart in a direction perpendicular to the first axis X on the base 40 and disposed parallel to each other. Two or more rails 49 may be provided.

In one embodiment, the base module 4 includes a first rack 41 that vertically connects the first frame 1 to the upper surface of the fixing part 45, and the second frame 2 with a slider 46 It may further include a second rack 42 vertically connected to the upper surface of the. In one embodiment, the first rack 41 and the second rack 42 may be fixedly coupled to the fixing part 45 and the slider 46 through

rack fixtures

410 and 420, respectively. The first rack 41 and the second rack 42 fix the first frame 1 and the second frame 2 to the top of the base 40 in a vertical form so that the first electrode 10 and the The two electrodes 20 can help maintain a state parallel to each other.

In one embodiment, when the rail 49 is coupled to the lower portion of the fixing portion 45, a recess in which the rail 49 is accommodated and engaged may be formed. In one embodiment, a recess may be formed at the bottom of the slider 46 to receive and engage the rail 49 when coupled with the rail 49 .

In one embodiment, the fixing part 45 may be fixed to the rail 49, and the slider 46 may be slidably coupled to the rail 49 in the first axis (X) direction. The fixing part 45 fixedly connects the first frame 1 to the rail 49, and the slider 46 extends the rail 49 so that the second frame 2 can move in the direction of the first axis X. can be slidably connected to Accordingly, in the radiation measuring device 100, when the driving module 5 is operated, the second frame 2 relatively moves along the rail 49 while the first frame 1 is fixed, so that the electrode spacing is reduced. can be changed. In another embodiment, the fixing part 45 may be slidably coupled to the rail 49 .

Hereinafter, the configuration and operation of the driving module 5 will be described. The driving module 5 may be configured to linearly move the second frame 2 in the first axis X. In one embodiment, the driving module 5 may include a housing 50 in which a motor is accommodated and a moving shaft 51 having one end connected to the motor and the other end connected to the second frame 2. . The motor of the driving module 5 may generate a driving force for moving the second frame 2 in the first axis X direction according to an input signal transmitted from the control module.

In one embodiment, the second rack 42 is fixedly coupled to the second frame 2, and the movable member 55 may be fixedly coupled to the second rack 42. In this case, one end of the moving shaft 51 may be connected to the moving member 55 . In addition, the movable member 55 may include a through hole 550 passing along the first axis X so that at least a portion of the movable shaft 51 is inserted. The moving shaft 51 may include a fastening end 510 inserted into the through hole 550 . In this case, when the driving module 5 operates, the second frame 2 , the second rack 42 , and the moving member 55 may move together along the moving axis 51 .

In one embodiment, threads engaging each other are formed on the inner circumferential surface of the through hole 550 and the surface of the fastening end 510 so that the fastening end 510 can be screwed into the through hole 550 . In this case, since the position of one end of the moving shaft 51 connected to the motor is fixed, when the moving shaft 51 rotates around the first axis X during operation of the drive module 5, the moving shaft 51 The rotational motion of the moving shaft 51 is converted into a linear motion of the moving member 55 screwed with the fastening end 510 of the moving shaft 51, so that the second frame 2 moves along with the moving member 55 to the first shaft ( X) towards the first frame 1 or towards the housing 50 . The driving module 5 may be configured to move at least one of the first frame 1 and the second frame 2 on the first axis X, and is not limited to the above embodiment.

In one embodiment, a ring member 53 mounted on an outer circumferential surface of the moving shaft 51 may be disposed between the second frame 2 and the housing 50 of the driving module 5 . The ring member 53 may be movably coupled to the moving shaft 51 . In one embodiment, the ring member 53 may function as a stopper member that limits the movement distance of the second frame 2 toward the housing 50 . In this case, the moving shaft 51 may be provided to idle inside the ring member 53 so that the ring member 53 does not interlock with the rotation of the moving shaft 51 . In addition, the ring member 53 may provide a buffering effect when the second frame 2 and the housing 50 of the driving module 5 come into contact. The shape of the ring member 53 is not limited to the ring shape as shown in the drawing.

In one embodiment, drive module 5 may be electrically (or operatively) connected to a control module (not shown). In this case, the control module may control the operation of the driving module 5 based on various control signals including a user's input.

Hereinafter, configurations for monitoring the degree to which the first electrode 10 and the second electrode 20 are arranged in parallel with each other (hereinafter referred to as “electrode parallelism”) will be described. In one embodiment, the radiation detection device 100 measures the electrode spacing at different locations using a first sensor 60 and a second sensor (not shown) that are displacement sensors or distance measuring sensors, It can be configured to measure electrode parallelism from electrode spacing data.

In the illustrated embodiment, the first sensor 60 may be provided on at least one of the first frame 1 and the second frame 2 . In this case, the first sensor 60 includes a first sensor member 60a mounted on the first frame 1 and a second sensor mounted on the second frame 2 to face the first sensor member 60a. A member 60b may be included. In one embodiment, the first sensor member (60a) and the second sensor member (60b) may be mounted on the upper portion of the first frame (1) and the second frame (2), respectively.

In one embodiment, the first sensor 60 may be a capacitive displacement sensor that is a non-connected displacement sensor. Electrode plates may be formed on surfaces of the first sensor member 60a and the second sensor member 60b facing each other. In this case, when the second frame 2 moves in the direction of the first axis X, the static electricity between the electrode plates changes as the distance between the first sensor member 60a and the second sensor member 60b changes. The movement displacement of the second frame 2 can be measured by measuring the capacitance.

In another embodiment, the second sensor member 60b may include a reflective member on a surface facing the first sensor member 60a. The first sensor member 60a transmits infrared rays, visible rays, or ultrasonic waves to the second sensor member 60b toward the second sensor member 60b, receives the reflected wave transmitted from the second sensor member 60b, and reciprocates. It may be configured to measure the movement displacement of the second frame 2 by measuring time. The specific configuration of the first sensor 60 is not limited to the above embodiment.

In one embodiment, the drive module 5 is provided with a second sensor (not shown) electrically connected to the motor to measure the movement displacement on the first axis X of the second frame 2. It can be. In one embodiment, the control module may communicate with the first sensor 60 and the second sensor to receive data measured by the first sensor 60 and the second sensor, respectively. In this case, the control module may calculate electrode parallelism by comparing the upper electrode gap and the lower electrode gap through the received data. Regarding the operation of the driving module 5 to maintain the parallelism of the electrodes, the control module determines whether or not the movement of the second frame 2 is required to match the parallelism of the electrodes, and generates a control signal if additional movement is required. It is also possible to automatically match the electrode parallelism by transmitting to the drive module 5.

In one embodiment, the drive module 5 is a component for controlling the operation of the motor, and may include a control member (not shown) electrically connected to the motor. The control member may receive a control signal including a user's input from the control module. The control member may generate a feedback signal for the movement displacement measured with the second sensor. For example, when the movement displacement measured by the second sensor does not match the control signal of the control module and adjustment for matching is required, the control member generates a feedback signal and transmits it to the motor so that the electrode spacing is adjusted according to the control signal. can do.

In one embodiment, an example of monitoring electrode parallelism by providing one sensor on each of the upper portions of the first frame 1 and the second frame 2 and the driving module 5 has been described, but the number of sensors is limited to this It is not. As an example, it is also possible that additional sensors for measuring electrode intervals at various positions of the electrodes are further mounted on the first frame 1 or the second frame 2 .

According to the configuration of the first sensor 60 and the second sensor described above, there is an advantage in that reliability of radiation measurement can be improved by monitoring and maintaining electrode parallelism in real time before and after changing the electrode spacing.

In various embodiments, it is also possible to provide electrodes parallel to each other in an ion chamber filled with gas and maintain a constant internal volume, and to change the electrode spacing by moving at least one of both electrodes. In this case, the driving module may be provided inside or outside the ion chamber to move the electrode.

A radiation detection apparatus 100 according to an embodiment disclosed in this document includes a first frame 1 provided with a first electrode 10 on one surface; a second frame (2) provided with a second electrode (20) facing the first electrode (10) on one surface and spaced apart from the first frame (1) in a first axis (X) direction; a driving module (5) connected to the second frame (2) and configured to move the second frame (2) relative to the first frame (1) in the direction of the first axis (X); And a side cover (3) connecting the first frame (1) and the second frame (2) and enclosing the space between the first frame (1) and the second frame (2). Including, the side cover 3, the first electrode 10 and the second electrode 20 are accommodated between the first frame 1 and the second frame 2 and filled with gas The ion chamber 30 may be formed and formed to be stretchable along the first axis X.

In one embodiment, the side cover 3 has both ends connected to the first frame 1 and the second frame 2, and the second frame 2 for the first frame 1 ) may be formed so that the length in the direction of the first axis (X) changes in response to the movement of the first axis (X).

In one embodiment, at least a portion of the side cover 3 may be formed to be folded or unfolded in the direction of the first axis (X).

In one embodiment, at least a portion of the side cover 3 may be formed in a bellows structure.

In one embodiment, the driving module 5 is configured to move the second frame 2 in a direction closer to or farther from the first frame 1, and the first electrode 10 and the The distance between the second electrodes 20 may be changed corresponding to the movement of the second frame 2 .

In one embodiment, one of the first electrode 10 or the second electrode 20 is negatively charged and the other is positively charged, and when a high voltage is applied to the negative electrode, the ion chamber 30 Electrons generated by ionization of the gas may be collected at the anode.

In one embodiment, an electronic component mounted on the first frame 1 or the second frame 2 and electrically connected to at least one of the first electrode 10 and the second electrode 20 ( 13), and the electronic component 13 may be configured to measure the amount of change in the current at the anode and process the measured data.

In one embodiment, at least one of both ends of the side cover 3 in the direction of the first axis (X), the side cover 3 is attached to the first frame 1 so that the ion chamber 30 is sealed. ) or a sealing member closely connected to the second frame 2 may be provided.

In one embodiment, in at least one of the first frame 1 and the second frame 2, a first sensor for measuring the distance between the first electrode 10 and the second electrode 20 ( 60) can be installed.

In one embodiment, the drive module 5 includes a housing 50 in which a motor is accommodated; a moving shaft 51 having one end connected to the second frame 2 and the other end connected to the motor; And electrically connected to the motor, it may include a second sensor for measuring the moving distance of the second frame (2).

In one embodiment, a moving member 55 coupled to the second frame 2 and having a through hole 550 penetrating in the first axis (X) direction is formed, and the moving axis 51 is It includes a fastening end 510 inserted into the through hole 550, and screw threads screwed together may be formed on an inner circumferential surface of the through hole 550 and a surface of the fastening end 510, respectively.

In one embodiment, a base module 4 supporting the first frame 1, the second frame 2 and the driving module 5 is further included, and the base module 4 includes a base ( 40); a rail 49 mounted on the base 40 and extending in the direction of the first axis X; A fixing part 45 fixedly connected to the rail 49 and to which the first frame 1 is coupled; and a slider 46 slidably connected to the rail 49 and coupled to the second frame 2 .

In one embodiment, the first state in which the distance between the first electrode 10 and the second electrode 20 is the first distance d1 and the first electrode 10 and the second electrode 20 It may be possible to transform into a second state in which the distance between them is a second distance d2 smaller than the first distance.

Claims

A first frame having a first electrode on one surface;

a second frame provided with a second electrode facing the first electrode on one surface and spaced apart from the first frame in a first axial direction;

a drive module connected to the second frame and configured to move the second frame relative to the first frame in the first axial direction; and

A side cover connecting the first frame and the second frame and surrounding to seal a space between the first frame and the second frame; includes,

The side cover,

An ion chamber in which the first electrode and the second electrode are accommodated and filled with gas is formed between the first frame and the second frame, and is formed to be stretchable along the first axis.
According to claim 1,

the side cover

Both ends are connected to the first frame and the second frame, and the length in the first axial direction changes in response to movement of the second frame relative to the first frame.
According to claim 1,

At least a portion of the side cover is formed to be folded or unfolded in the first axis direction.
According to claim 1,

At least a portion of the side cover is formed in a bellows structure.
According to claim 1,

The driving module is configured to move the second frame in a direction approaching or moving away from the first frame,

The radiation detection device of claim 1 , wherein a distance between the first electrode and the second electrode is changed corresponding to movement of the second frame.
According to claim 1,

One of the first electrode or the second electrode is negatively charged and the other is positively charged,

When a high voltage is applied to the cathode, electrons generated by gas ionization in the ion chamber are collected at the anode.
According to claim 6,

An electronic component mounted on the first frame or the second frame and electrically connected to at least one of the first electrode and the second electrode;

The electronic component is configured to measure the amount of change in the current at the anode and process the measured data.
According to claim 1,

At least one of both ends of the side cover in the first axial direction is provided with a sealing member closely connecting the side cover to the first frame or the second frame to seal the ion chamber.
According to claim 1,

A first sensor for measuring a distance between the first electrode and the second electrode is mounted on at least one of the first frame and the second frame.
According to claim 1,

The drive module,

A housing in which the motor is accommodated;

a moving shaft having one end connected to the second frame and the other end connected to the motor; and

and a second sensor electrically connected to the motor and measuring a moving distance of the second frame.
According to claim 10,

Further comprising a movable member coupled to the second frame and formed with a through hole penetrating in the first axial direction;

The moving shaft includes a fastening end inserted into the through hole,

The radiation detection device wherein screw threads screwed to each other are formed on an inner circumferential surface of the through hole and a surface of the fastening end.
According to claim 1,

Further comprising a base module supporting the first frame, the second frame and the driving module,

The base module,

Base;

a rail mounted on the base and extending in the first axial direction;

a fixing part fixedly connected to the rail and to which the first frame is coupled; and

and a slider slidably connected to the rail and coupled to the second frame.
According to claim 1,

Transformation into a first state in which the distance between the first electrode and the second electrode is a first distance and a second state in which the distance between the first electrode and the second electrode is a second distance smaller than the first distance A possible radiation detection device.