CN108267770A - A kind of measurement stent for leakage rediation under medical accelerator head - Google Patents

Abstract

The invention relates to a measuring bracket for radiation leakage under the nose of a medical accelerator, comprising a positioning plate, 8 first connecting rods and 8 second connecting rods; 8 second connecting rods and 8 first connecting rods respectively Set in the corresponding direction along the circumference of the positioning plate; the four first connecting rods located at twelve o'clock, three o'clock, six o'clock and nine o'clock are respectively provided with struts; the first connection The rod, the second connecting rod and the support rod are respectively provided with a first measuring point, a second measuring point, a third measuring point, a fourth measuring point and a fifth measuring point. The measuring bracket for radiation leakage under the head of a medical accelerator provided by the present invention has the advantages of simple design structure, convenient use and high efficiency, so that it can detect key dosimetry indicators, shorten the time for positioning, installation, debugging and data collection, and meet the requirements of The current situation of radiotherapy application in China is conducive to the standardized application of medical institutions, technical service institutions and related departments.

Description

A measurement bracket for radiation leakage under the head of a medical accelerator

technical field

The invention belongs to the technical field of measurement of radiation leakage under the nose of a medical accelerator, and in particular relates to a measurement bracket for radiation leakage under the nose of a medical accelerator.

Background technique

In view of the requirements of 29.2 and 29.3 in GB 9706.5-2008 "Medical Electrical Equipment Part 2: Special Requirements for the Safety of Electron Accelerators with Energy 1MeV to 50MeV" and the requirements in 5.1 and 5.2 of GBZ 126-2011 "Radiation Protection Requirements for Electron Accelerator Radiation Therapy" , radiation leakage under the head of medical electron accelerator is one of the key contents of its protective performance requirements. However, the relevant national standards only set standard requirements for its performance, and the specific implementation rules or recommended practical tools have not been further clarified, and relevant domestic supervision units, public institutions, private institutions and other institutions with radiological technical service qualifications have not yet Can unify detection tools.

Once the performance test of the medical radiation device fails to meet the standard, it is not allowed to be used in clinical practice. With the development of my country's economic level and the increasingly stringent supervision of large-scale medical equipment, the performance testing of large-scale domestic equipment such as medical electron accelerators is also increasingly on the agenda, and it is becoming more and more stringent, requiring medical institutions to have independent testing. technology and capabilities. Domestic medical institutions are even more lacking in quality control dose verification methods, not to mention the development and development of medical accelerator performance testing tools. At the same time, in view of the required index of radiation leakage under the accelerator, it is one of the issues that have attracted widespread attention in radiotherapy, and the size of the leakage radiation dose is also one of the main considerations for the protection of the non-main shielding direction of the accelerator room.

At present, although there has been a measurement of radiation leakage under the head of a medical accelerator in China, it uses a horizontal plane in the machine room to be fixed to the front, back, up and down, left and right around the machine room by pulling wires, and then according to GBZ126-2011 "Electronic The radiation measurement points in 5.1 and 5.2 of Accelerator Radiation Therapy Radiation Protection Requirements require that the corresponding position of the line be stained with dose measurement components. The method is complex, cumbersome, and the workload is heavy. The most important thing is that there is no specific measurement method and process. .

Therefore, it is urgent to develop a practical tool for measuring the radiation leakage under the head of the medical electron accelerator that can meet the requirements of 5.1 and 5.2 in GBZ 126-2011 "Radiation Protection Requirements for Electron Accelerator Radiation Therapy".

Contents of the invention

In order to solve the above problems, the object of the present invention is to provide a measurement bracket for radiation leakage under the head of a medical accelerator, which has the advantages of simple design structure, convenient use and high efficiency, so that it can detect key dosimetry indicators, shorten the positioning and installation , debugging and data collection time, in line with the status quo of domestic radiotherapy applications, is conducive to the standardized application of medical institutions, technical service institutions and related departments.

The technical scheme adopted in the present invention is:

A measuring bracket for radiation leakage under the nose of a medical accelerator, which includes a positioning plate, and the positioning plate is provided with 8 first connecting rods and 8 second connecting rods for radiation distribution along the circumference; The second connecting rod is respectively along the one o'clock direction, the two o'clock direction, the four o'clock direction, the five o'clock direction, the seven o'clock direction, the eight o'clock direction, the ten o'clock direction and the eleven o'clock direction of the positioning plate. Setting; the eight first connecting rods are respectively along the twelve o'clock direction, one and a half o'clock direction, three o'clock direction, four and a half o'clock direction, six o'clock direction, seven and a half o'clock direction, Nine o'clock and ten-thirty o'clock settings;

The four first connecting rods and the eight second connecting rods located at twelve o'clock, three o'clock, six o'clock and nine o'clock are respectively provided with first measuring points along the length direction and the second measurement point, and the first measurement point and the second measurement point correspond to the leakage radiation measurement point in the M area of the medical accelerator;

The eight first connecting rods are respectively provided with a third measuring point and a fourth measuring point along the length direction; the four connecting rods located at twelve o'clock, three o'clock, six o'clock and nine o'clock The first connecting rods are respectively provided with struts, and the struts are provided with two fifth measuring points; the two fifth measuring points are located on both sides of the corresponding first connecting rods, and the third measuring point, the fourth measurement point and the fifth measurement point correspond to the leakage radiation measurement points outside the M area of the medical accelerator.

Further, the support rod includes two third connecting rods, and the two third connecting rods are respectively located on both sides of the corresponding first connecting rod, and are detachably connected to the corresponding first connecting rod ; One said third connecting rod is provided with one said fifth measuring point.

Further, the support rod also includes a fourth connecting rod; one side of the fourth connecting rod is provided with an open slot for preset the first connecting rod, and the fourth connecting rod is connected to the The first connecting rod is detachably connected; the two third connecting rods are plug-fitted with the two ends of the fourth connecting rod respectively.

Further, the first connecting rod, the second connecting rod, the third connecting rod and the fourth connecting rod are all hollow tubes.

Further, the cross-sectional shape of the hollow tube is square.

Further, the positioning disc is provided with sockets corresponding to the first connecting rod and the second connecting rod along the circumference of the positioning disc; the first connecting rod and the second connecting rod It is plugged and fitted with the positioning plate through the socket.

Further, the first measurement point, the second measurement point, the third measurement point, the fourth measurement point and the fifth measurement point are respectively provided with detector trays for installing detectors.

Further, the bottom surface of the positioning plate is provided with a support plate, and the bottom surface of the positioning plate is provided with adjustment feet.

Further, the adjustment foot is an adjustment bolt; the nut of the adjustment bolt is located on the top surface of the positioning plate, and the bottom end of the screw rod of the adjustment bolt passes through the positioning plate and the support plate in turn, and is located on the top surface of the positioning plate. the bottom surface of the support plate.

Further, the shape of the positioning disk is disc-shaped; and the center position of the top surface of the positioning disk is provided with a positioning mark for aligning with the center of the shot field; the top surface of the positioning disk is also provided with a level.

Beneficial effects of the present invention:

The measurement bracket for radiation leakage under the head of a medical accelerator provided by the present invention has the advantages of simple design structure, convenient use and high efficiency, so that it can detect key dosimetry indicators, shorten the time for setting up, installation, debugging and data collection, and meet the requirements of The current situation of radiotherapy application in China is conducive to the standardized application of medical institutions, technical service institutions and related departments.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is the measuring support structure schematic diagram that is used for the leakage radiation under the medical accelerator head described in the embodiment;

Fig. 2 is a schematic diagram of the clamping structure of the fourth connecting rod and the first connecting rod described in the embodiment;

Fig. 3 is the structural representation of the fourth connecting rod described in the embodiment;

Fig. 4 is a schematic structural view of the detector tray described in the embodiment;

Fig. 5 is a structural schematic diagram of the adjusting foot described in the embodiment.

The labels in the figure are:

The first connecting rod 101, the second connecting rod 102, the strut 103, the third connecting rod 131, the fourth connecting rod 104, the fastening bolt 105, the opening slot 106, the positioning plate 107, the supporting plate 108, the adjusting bolt 109, detection container tray 110.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other implementations obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Example

As shown in Figures 1 to 5, this embodiment provides a measurement bracket for radiation leakage under the nose of a medical accelerator, which includes a positioning plate, and the positioning plate is provided with 8 first radiation distribution along the circumferential direction. Connecting rods and 8 second connecting rods; 8 described second connecting rods are respectively along the one o'clock direction, the two o'clock direction, the four o'clock direction, the five o'clock direction, the seven o'clock direction, and the eight o'clock direction of the positioning plate. 12 o'clock, 1:30 o'clock, 3 o'clock, 4:30 Clock direction, six o'clock direction, seven-thirty o'clock direction, nine o'clock direction and ten-thirty o'clock direction settings.

Wherein, the 4 first connecting rods and the 8 second connecting rods located in the twelve o'clock direction, the three o'clock direction, the six o'clock direction and the nine o'clock direction are respectively provided with first A measurement point and a second measurement point, and the first measurement point and the second measurement point correspond to the leakage radiation measurement points in the M area of the medical accelerator.

The eight first connecting rods are respectively provided with a third measuring point and a fourth measuring point along the length direction; the four connecting rods located at twelve o'clock, three o'clock, six o'clock and nine o'clock The first connecting rods are respectively provided with struts, and the struts are provided with two fifth measuring points; the two fifth measuring points are located on both sides of the corresponding first connecting rods, and the third measuring point, the fourth measurement point and the fifth measurement point correspond to the leakage radiation measurement points outside the M area of the medical accelerator.

Based on the above-mentioned structure, the measurement bracket for the leakage radiation under the head of the medical accelerator, when in use, align the center of the positioning plate with the field center of the medical accelerator, and respectively correspond to the medical accelerator through the first measurement point and the second measurement point. The 24 measurement points of the average leakage radiation in the M area of the accelerator measure the leakage radiation in the M area, and the third measurement point, the fourth measurement point and the fifth measurement point correspond to the 24 average leakage radiation outside the M area of the medical accelerator. The measuring point measures the leaked radiation outside the M zone.

Therefore, this embodiment provides a practical tool for measuring radiation leakage under the nose of a medical electron accelerator that can meet the requirements of 5.1 and 5.2 in GBZ 126-2011 "Radiation Protection Requirements for Electron Accelerator Radiation Therapy"; it has a design structure Simple, easy to use and efficient, etc., so as to detect key indicators of dosimetry, shorten the time of setting up, installation, commissioning and data collection, in line with the current situation of domestic radiotherapy applications, and conducive to the standardized application of medical institutions, technical service institutions and related departments.

It should be noted that all first measurement points lie on the same circle, all second measurement points lie on the same circle, all third measurement points lie on the same circle, all fourth measurement points lie on the same circle and all fifth measurement points Located on the same circle, specifically refer to the positions of the average leaked radiation measurement points in 5.1 and 5.2 of GBZ 126-2011 "Requirements for Radiation Protection of Electron Accelerator Radiation Therapy".

Specifically, the support rod includes two third connecting rods, and the two third connecting rods are respectively located on both sides of the corresponding first connecting rod, and are detachable from the corresponding first connecting rod Connection; one said third connecting rod is provided with one said fifth measuring point. Wherein, as shown in Fig. 2 and Fig. 3, the support rod also includes a fourth connecting rod; one side of the fourth connecting rod is provided with an open slot for preset the first connecting rod, and the fourth connecting rod The connecting rod is detachably connected to the first connecting rod through fastening bolts; the two third connecting rods are plug-fitted with both ends of the fourth connecting rod respectively.

Based on the above-mentioned structure of the strut, the clamping and fixing of the fourth connecting rod and the first connecting rod are facilitated through the opening slot, and the assembly/disassembly thereof is facilitated through fastening bolts; at the same time, the two third connecting rods are respectively connected to the Both ends of the fourth connecting rod are plug-fitted so as to facilitate the assembly/disassembly of the third connecting rod and the fourth connecting rod, and the plug-fitting can better improve the assembly/disassembly efficiency compared to the screw connection.

At the same time, preferably, the top surface of the opening groove is flush with the top surfaces of the sockets at both ends of the fourth connecting rod; thus, after the fourth connecting rod and the first connecting rod are clamped and fixed through this structure, it can be guaranteed to be inserted into the The top surfaces of the measurement points of the third connection rod at the two ends of the fourth connection rod are in the same plane as the top surfaces of the measurement points of the first connection, which is convenient for measurement.

Preferably, the opening slot is arranged at the middle position of the fourth connecting rod, and the fourth connecting rod is arranged perpendicular to the first connecting rod; the first connecting rod, the second connecting rod, the third connecting rod, The fourth connecting rods are all hollow tubes, so that the weight of the bracket can be reduced and the cost can be saved; wherein, the hollow tubes are preferably aluminum tubes; the tube wall thickness.

In order to facilitate the disassembly/assembly of the first connecting rod and the second connecting rod and the positioning plate, the positioning plate is provided with a one-to-one correspondence with the first connecting rod and the second connecting rod along the circumferential direction of the positioning plate. the socket; the first connecting rod and the second connecting rod are plugged and fitted with the positioning plate through the socket.

Preferably, the cross-sectional shape of the hollow tube is square, and the shape of the socket is a square matching the cross-sectional shape of the hollow tube, so that the first connecting rod and the second connecting rod can play a role after being inserted into the socket. The limit function prevents the first connecting rod and the second connecting rod from rotating during use and affecting the measurement effect.

In order to install and fix the detectors respectively at the first measuring point, the second measuring point, the third measuring point, the fourth measuring point and the fifth measuring point, at the first measuring point, the The second measuring point, the third measuring point, the fourth measuring point and the fifth measuring point are respectively provided with detector trays for installing detectors; as shown in Figure 5, the detector tray includes The disc body with installation grooves on the top and the screw rods arranged at the bottom of the disc body, so that the screw rods can be matched with the threaded holes on the connecting rods to facilitate the disassembly/installation of the detector tray and the connecting rods, and facilitate the loading of the detectors on the the groove on the top of the plate.

Preferably, the bottom surface of the positioning plate is provided with a support plate, and the bottom surface of the positioning plate is provided with an adjusting foot; wherein, the adjusting foot is an adjusting bolt; the nut of the adjusting bolt is located on the top of the positioning plate On the surface, the bottom end of the screw rod of the adjusting bolt passes through the positioning plate and the supporting plate in turn, and is located on the bottom surface of the supporting plate, so that the nut of the adjusting bolt can be rotated and operated from above after the positioning plate is placed, Facilitate the leveling operation of the stand.

Preferably, the shape of the positioning plate is disc-shaped, and the center position of the top surface of the positioning plate is provided with a positioning mark for alignment with the center of the field, so that the alignment of the field center of the medical accelerator is facilitated by the positioning mark. The center position of the top surface of the positioning plate is accurately positioned; the top surface of the positioning plate is also provided with a spirit level, which is beneficial to observe whether the support is horizontal, and cooperates with the adjusting bolt to facilitate the leveling operation.

In this embodiment, each connecting rod can be set as a connecting rod composed of at least two sections connected in a detachable connection, so that after disassembly, storage space can be saved, and it is easy to carry or prevent, making it more flexible and convenient to use . For example, the first connecting rod is composed of three sections of aluminum tubes detachably connected, and two adjacent sections of aluminum tubes can be fixedly connected by positioning pins during assembly.

Example 2

As a preferred length dimension of the bracket in the above-mentioned embodiment 1, the lengths of the three sections of aluminum tubes forming the first connecting rod are respectively 550 mm, and the length of the aluminum tube as the second connecting rod is 230 mm, as The length of the aluminum pipe of the third connecting rod is 450 mm, and the length of the aluminum pipe serving as the fourth connecting rod is 100 mm.

At the same time, the diameter of the positioning plate is 200mm, and the thickness is 30mm; the specification of the jack is 10mm×10mm, and the three sections of aluminum tubes that form the first connecting rod, the aluminum tube as the second connecting rod, and the aluminum tube as the third connecting rod All are square aluminum tubes with a specification of 10mm×10mm, and the aluminum tube used as the fourth connecting rod is a square aluminum tube with a specification of 8mm×8mm.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. Should be covered within the protection scope of the present invention.

Claims (10)

1. A measuring bracket for radiation leakage under the head of a medical accelerator, characterized in that it comprises a positioning plate, and the positioning plate is provided with 8 first connecting rods and 8 second connecting rods of radiation distribution along the circumferential direction ; 8 said second connecting rods respectively along the one o'clock direction, two o'clock direction, four o'clock direction, five o'clock direction, seven o'clock direction, eight o'clock direction, ten o'clock direction and The eleven o'clock direction is set; the eight first connecting rods are respectively along the twelve o'clock direction, the one and a half o'clock direction, the three o'clock direction, the four and a half o'clock direction, the six o'clock direction, and the seven o'clock direction of the positioning plate. Half o'clock, nine o'clock and ten thirty o'clock settings; The four first connecting rods and the eight second connecting rods located at twelve o'clock, three o'clock, six o'clock and nine o'clock are respectively provided with first measuring points along the length direction and the second measurement point, and the first measurement point and the second measurement point correspond to the leakage radiation measurement point in the M area of the medical accelerator; The 8 first connecting rods are respectively provided with a third measuring point and a fourth measuring point along the length direction; the 4 connecting rods located at twelve o'clock, three o'clock, six o'clock and nine The first connecting rods are respectively provided with struts, and the struts are provided with two fifth measuring points; the two fifth measuring points are located on both sides of the corresponding first connecting rods, and the third measuring point, the fourth measurement point and the fifth measurement point correspond to the leakage radiation measurement points outside the M area of the medical accelerator. 2. The measuring bracket for radiation leakage under the head of a medical accelerator according to claim 1, wherein the support rods include two third connecting rods, and the two third connecting rods are respectively located at the corresponding The two sides of the first connecting rod are detachably connected with the corresponding first connecting rod; one of the third connecting rods is provided with one of the fifth measuring points. 3. The measurement bracket for radiation leakage under the head of a medical accelerator according to claim 2, wherein the support rod also includes a fourth connecting rod; one side of the fourth connecting rod is provided with a preset The opening slot of the first connecting rod, and the fourth connecting rod is detachably connected with the first connecting rod through fastening bolts; the two third connecting rods are respectively connected with the two of the fourth connecting rod end mating. 4. The measuring bracket for radiation leakage under the medical accelerator headpiece according to claim 3, characterized in that, the first connecting rod, the second connecting rod, the third connecting rod, the second connecting rod The four connecting rods are all hollow tubes. 5 . The measuring bracket for radiation leakage under the nose of a medical accelerator according to claim 4 , wherein the cross-sectional shape of the hollow tube is square. 6 . 6. The measurement bracket for radiation leakage under the headpiece of a medical accelerator according to any one of claims 1-5, wherein the positioning plate is provided with a ring along the circumferential direction of the positioning plate and the first The connecting rod and the second connecting rod have one-to-one corresponding sockets; the first connecting rod and the second connecting rod are plugged and fitted with the positioning plate through the sockets. 7. The measurement bracket for radiation leakage under the head of a medical accelerator according to claim 6, characterized in that, the first measurement point, the second measurement point, the third measurement point, the first measurement point Detector trays for installing detectors are respectively arranged at the four measuring points and the fifth measuring point. 8. The measuring bracket for radiation leakage under the head of a medical accelerator according to any one of claims 1-6, wherein a support plate is provided on the bottom surface of the positioning plate, and a support plate is provided on the bottom surface of the positioning plate With adjustment feet. 9. The measurement bracket for radiation leakage under the head of a medical accelerator according to claim 8, wherein the adjusting foot is an adjusting bolt; the nut of the adjusting bolt is located on the top surface of the positioning plate, The bottom end of the screw rod of the adjusting bolt passes through the positioning plate and the supporting plate in sequence, and is located on the bottom surface of the supporting plate. 10. The measuring bracket for the radiation leakage under the medical accelerator headpiece according to claim 9, wherein the shape of the positioning disc is disc-shaped; and the center position of the top surface of the positioning disc is provided with a useful The positioning mark is aligned with the center of the shooting field; the top surface of the positioning plate is also provided with a level.