Seat type radioactive internal pollution measuring device and system

Abstract

The invention relates to a seat type radioactive internal pollution measuring device and system, and the device comprises a seat structure which is used for a detected person to sit; the detector structure is used for detecting the types of radioactive substances in the body of the detected person and the content of the radioactive substances; the trunk detector shielding body is arranged to be in an oval table shape; the thyroid detector shielding body is cylindrical, and the central axis of the cylinder is parallel to the ground; the positioning structure is connected with the trunk detector shielding body and the thyroid detector shielding body and used for adjusting the height and angle of the trunk detector shielding body and the thyroid detector shielding body; and the movable platform is used for moving the structure. According to the invention, the structure of the trunk detector shielding body and the thyroid detector shielding body is arranged, the thyroid part and the trunk part can be locally measured, meanwhile, the movable platform is arranged, so that the measuring device can flexibly move, and the measuring device is suitable for the scene of on-site emergency carrying and moving.

Description

Technical Field

[0001] The invention relates to the technical field of ionizing radiation monitoring and protection, and in particular to a chair-type radioactive internal contamination measuring device and system. Background Art

[0002] In radioactive practical activities, such as nuclear fuel cycle, nuclear technology research, production and use of radioisotopes, operation of gaseous or volatile radioactive materials, and decommissioning of nuclear facilities, and even in the case of nuclear accidents, radioactive nuclides can enter the human body through inhalation, ingestion, wounds or skin, thus causing internal radioactive contamination and radiation exposure to the human body. In order to ensure the effectiveness of radiation protection and protect the health of personnel, it is necessary to monitor the internal exposure of radioactive occupational personnel. In the case of radioactive accidents or other special exposure situations, it is also necessary to consider monitoring the internal exposure of the public who may be contaminated.

[0003] The methods of internal radiation monitoring mainly include direct measurement and indirect measurement. Among them, direct measurement refers to the use of an in vitro detection system to directly measure the content of radioactive substances in the human body. For internal radiation monitoring, direct measurement is usually preferred. At present, internal radiation measurement systems are mostly used for routine measurements, and the measurement forms are mainly standing and bed-type. For example, the standing measurement system mainly uses large-volume detectors with relatively high detection efficiency; the bed-type measurement system has a complex structure and a low background, and can be used for low-level radioactivity measurements.

[0004] However, the above two types of measurement systems have complex structures, large sizes, and are inconvenient to move. They cannot be used for on-site emergency measurements, and are costly and difficult to promote. In addition, the direct measurement methods in the prior art can only be used for whole-body measurements and cannot perform accurate local measurements, which has certain limitations in use.

[0005] The above problems need to be solved urgently. Summary of the invention

[0006] The invention discloses a chair-type radioactive internal contamination measuring device and system, aiming to solve the technical problems existing in the prior art.

[0007] The present invention adopts the following technical solutions:

[0008] On the one hand, the present invention provides a chair-type radioactive internal contamination measuring device, which includes: a chair structure for a detected person to sit; a detector structure for detecting the type and content of radioactive substances in the body of the detected person; a torso detector shield, which is arranged in the sitting direction of the detected person and is arranged in an elliptical cone shape; the torso detector shield includes a first end and a second end with a diameter larger than the first end, the first end is arranged in the direction of the detector structure, and the second end is arranged in the direction of the detected person, and the torso detector shield is used to shield radioactive substances in the radiation environment; a thyroid detector shield is arranged in the sitting direction of the detected person and is higher than the torso detector shield, and is arranged in a cylindrical shape. The central axis of the cylinder is parallel to the ground, one end of the cylinder is fixedly connected to the detector structure, and the thyroid detector shield is used to shield the radioactive substances in the radiation environment; a positioning structure is connected to the torso detector shield and the thyroid detector shield, and is used to adjust the height and angle of the torso detector shield and the thyroid detector shield; a movable platform, the seat structure, the detector structure, the torso detector shield, the thyroid detector shield and the positioning structure are all installed on the movable platform, and the movable platform is used to move the seat structure, the detector structure, the torso detector shield, the thyroid detector shield and the positioning structure.

[0009] Optionally, the seat structure includes: a seat, parallel to the ground, for the detected person to sit; a chair back, perpendicular to the seat, for shielding radioactive materials behind the detected person; a support frame, connected between the seat and the movable platform, for supporting the seat and adjusting the seat height.

[0010] Optionally, the seat and the chair back are both made of lead plate material, a stainless steel shell is wrapped around the outside of the lead plate material, and the surface of the stainless steel shell on the side of the seat facing the detector structure and the surface of the stainless steel shell on the side of the chair back facing the detector structure are both covered with copper plates.

[0011] Optionally, the detector structure includes: a torso detector, which is a high-purity germanium detector or a sodium iodide detector; and a thyroid detector, which is a cadmium zinc telluride detector or a sodium iodide detector.

[0012] Optionally, the torso detector shielding body is made of lead plate material, and a stainless steel shell is provided on the outside of the lead plate material; the thyroid detector shielding body is made of lead plate material, and a stainless steel shell is provided on the outside of the lead plate material.

[0013] Optionally, the positioning structure includes: a vertical column, installed on the movable platform and perpendicular to the ground; a horizontal platform, installed on the vertical column and parallel to the ground; a traction screw, arranged on the horizontal platform; an annular guide gear, connected to the traction screw, and the torso detector shield is nested in the annular guide gear; a screw knob, arranged on the traction screw, and rotating the screw knob can adjust the inclination angle of the annular guide gear; an annular guide gear knob, arranged on the outside of the annular guide gear, and rotating the annular guide gear knob can control the annular guide gear to rotate along the center axis.

[0014] Optionally, the positioning structure also includes: a horizontal column installed on the vertical column, perpendicular to the vertical column and parallel to the ground, and the thyroid detector shielding body is embedded in the horizontal column; a rack slide rail, nested in the groove of the vertical column and connected to the horizontal column; a rack sliding adjustment knob installed on the rack slide rail, and rotating the rack sliding adjustment knob can drive the horizontal column to move along the axial direction of the vertical column; a slide rail is arranged on the surface of the horizontal column, passing through the horizontal column, so that the thyroid detector shielding body is connected with the external environment, and the slide rail is parallel to the ground; a sliding adjustment knob passes through the slide rail and is fixedly connected to the thyroid detector shielding body, and moving the sliding adjustment knob can drive the thyroid detector shielding body to move along the axial direction of the horizontal column.

[0015] Optionally, the movable platform includes: a stainless steel plate plane, used to install the seat structure, the detector, the torso detector shield, the thyroid detector shield and the positioning structure; a support frame, arranged at the bottom of the stainless steel plate plane, used to support the stainless steel plate plane; universal wheels, including multiple ones, installed under the support frame and in contact with the ground, for moving the stainless steel plate plane.

[0016] According to another aspect of an embodiment of the present invention, a chair-type radioactive internal contamination measurement system is also provided, including: a measurement module, applied to the above-mentioned chair-type radioactive internal contamination measurement device, for acquiring measurement data, wherein the measurement data is a pulse signal; a digital multi-channel analyzer, connected to the measurement module, for converting the pulse signal into spectrum data; a computer device, connected to the digital multi-channel analyzer, for receiving the spectrum data and analyzing the spectrum data to obtain a measurement result.

[0017] Optionally, the computer device includes: a spectrum analysis module connected to the digital multi-channel analyzer, used to analyze the spectrum data and confirm the type and activity of the nuclide; a multi-body detection efficiency correction module, which is preset with detection efficiency data and detection efficiency curves of various physique groups, and performs fitting calculations based on the physical parameters of the detected person to determine the detection efficiency value, wherein the various physique groups are used to indicate people of different heights and weights; a dose estimation module, connected to the spectrum analysis module and the multi-body detection efficiency correction module, and used to calculate the internal radiation dose of the detected person according to the type, activity and detection efficiency value of the nuclide to obtain a measurement result; a data management module, connected to the dose estimation module, and used to store the measurement result in a preset data management format, and export and display the measurement result.

[0018] The technical solution adopted by the present invention can achieve at least one of the following beneficial effects:

[0019] In the embodiment of the present invention, by adopting the above-mentioned scheme, a torso detector shielding body and a thyroid detector shielding body structure are provided, and local measurement of the thyroid gland and torso parts can be performed. At the same time, a movable platform is provided so that the measuring device can be flexibly moved and is suitable for the purpose of on-site emergency transportation and movement, thereby achieving the technical effect of local measurement and easy transportation and movement, and further solving the technical problems that the measurement system in the related technology has a complex structure, is inconvenient to move, and cannot be used for on-site emergency measurement, and the direct measurement method is mostly used for whole-body measurement, and cannot perform local measurement, and has certain usage limitations. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments, which constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions explain the present invention and do not constitute improper limitations on the present invention. In the drawings:

[0021] Figure 1 It is a structural diagram of a chair-type radioactive internal contamination measuring device in Example 1 of the present invention;

[0022] Figure 2 It is a schematic diagram of the positioning structure of a chair-type radioactive internal contamination measuring device in Example 1 of the present invention;

[0023] Figure 3 It is a structural schematic diagram of a chair-type radioactive internal contamination measurement system in Example 2 of the present invention.

[0024] Description of reference numerals:

[0025] 1. Seat structure; 11. Seat; 12. Seat back; 13. Support frame;

[0026] 21. Torso detector shield; 22. Thyroid detector shield;

[0027] 3. Positioning structure; 31. Vertical column; 32. Traction screw; 33. Ring guide rail gear; 34. Horizontal column; 35. Slide rail; 36. Slide adjustment knob; 37. Moving chain; 38. Gear; 39. Horizontal platform; 321. Screw knob; 331. Ring guide rail gear knob; 311. Rack slide rail; 312. Rack slide adjustment knob;

[0028] 4. Movable platform; 41. Stainless steel plate surface; 42. Universal wheels. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. In the description of the present invention, it should be noted that the term "or" is usually used in the sense of including "and / or", unless the content clearly indicates otherwise.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or a magnetic connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be a connection between the two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, in the description of this application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance. In the description of the present invention, the meaning of "multiple" is at least two, such as two, three or more, unless otherwise clearly and specifically limited.

[0031] 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 ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] First, to facilitate understanding of the embodiments of the present invention, some terms or nouns involved in the present invention are explained below:

[0033] Radioactive internal contamination refers to the internal contamination caused by the intake of radionuclides by people through inhalation, ingestion, wounds, etc. It can be measured and evaluated through air sampling, biological sample testing or direct in vitro measurement.

[0034] A detector is a device that can detect the content and distribution of radioactive substances in the human body or the environment.

[0035] The detector shield is a device used to reduce or block the impact of external interference sources such as ionizing radiation on the performance of the detector. It is usually made of metal materials.

[0036] Multi-physique refers to people with different body types, heights, weights, and other physical parameters. These physical parameters can significantly affect the detection efficiency of the detector, because different physiques will lead to different distributions of radioactive materials and different absorption and blocking effects on radioactive rays.

[0037] In order to solve the problems existing in the prior art, the embodiments of the present application provide a chair-type radioactive internal contamination measurement device and system.

[0038] Example 1

[0039] This embodiment provides a chair-type radioactive internal contamination measurement device, such as Figure 1 As shown, Figure 1 1 is a structural diagram of a chair-type radioactive internal contamination measuring device in embodiment 1 of the present invention, the measuring device comprising:

[0040] The seat structure 1 is used for the detected person to sit or stand; the detector structure is used to detect the type and content of radioactive substances in the body of the detected person; the torso detector shielding body 21 is arranged in the sitting direction of the detected person and is arranged in the shape of an ellipse; the torso detector shielding body 21 includes a first end and a second end with a diameter larger than the first end, the first end is arranged in the direction of the detector structure, and the second end is arranged in the direction of the detected person, and the torso detector shielding body 21 is used to shield the radioactive substances in the radiation environment; the thyroid detector shielding body 22 is arranged in the sitting direction of the detected person and is higher than the torso detector shielding body 21, and is arranged in the shape of a cylinder, and the central axis of the cylinder is parallel to the ground. The seat structure 1, the detector structure, the torso detector shield 21, the thyroid detector shield 22 and the positioning structure 3 are all mounted on the movable platform 4, and the movable platform 4 is used to move the seat structure 1, the detector structure, the torso detector shield 21, the thyroid detector shield 22 and the positioning structure 3.

[0041] Based on the above structure, the detected person sits on the seat structure 1. When the measurement object is the chest or abdomen of the torso, due to the large width of the torso, the long axis of the elliptical cone-shaped torso detector shield 21 can be set parallel to the ground, and the angle of the torso detector shield 21 can be adjusted by traction screw 32 and screw knob 321. Moreover, the short axis of the elliptical cone-shaped torso detector shield 21 can limit the longitudinal field of view of the detector to a smaller extent, so that the detection field of the detector corresponds more accurately to the chest or abdomen of the human body. Finally, the torso, the torso detector shield 21 and the detector structure will form a closed body, which effectively realizes the effect of measuring radioactive substances in the local area of ​​the torso, breaking the limitation of the use of the device.

[0042] Optionally, when the measurement object is the human body, in order to ensure a larger longitudinal field of view of the detector and to cover the human body as much as possible, the torso detector shield 21 can be rotated 90 degrees by the annular guide gear 33 and the annular guide gear knob 331, and the angle of the torso detector shield 21 can be adjusted by the traction screw 32 and the screw knob 321, so that the short axis of the elliptical torso detector shield 21 is parallel to the ground, and the long axis is at a specific angle to the ground. Finally, the human body, the torso detector shield 21 and the detector structure will form a closed body, effectively achieving the effect of measuring radioactive substances in the human body.

[0043] Optionally, the trunk detector shielding body 21 may also be in the shape of a truncated cone. When the major axis and the minor axis of the elliptical cone are equal, the trunk detector shielding body 21 becomes in the shape of a truncated cone. In practical applications, the trunk detector shielding body 21 is mostly in the shape of an elliptical cone.

[0044] Optionally, since the thyroid part is located above the trunk, the thyroid detector shield 22 is arranged above the trunk detector shield 21, effectively corresponding to the part of the human body to be measured. The area of ​​the thyroid part is not large and can correspond to the area of ​​the detector, so it does not need to be set to an elliptical cone shape, only a cylindrical shape is required. The person being detected places the thyroid part at one end of the cylinder, and the other end of the cylinder is fixedly connected to the detector structure to form a closed space, which effectively achieves the effect of measuring the local area of ​​the thyroid.

[0045] Optionally, the structure of the torso detector shielding body 21 can also be "trumpet-shaped", that is, the main body is a cylindrical shielding, which is used to shield the incident rays from the sides and rear end of the detector structure. The "trumpet-shaped" design is adopted near the position of the detected person to limit the measurement range; because the thyroid measurement is a close-range measurement, the structure of the thyroid detector shielding body 22 is cylindrical, that is, it is used to shield the incident rays from the sides and rear end of the detector structure, and is also used to limit the measurement range.

[0046] Optionally, since the heights of different detected persons are different, the positions of the thyroid detector shielding body 22 and the torso detector shielding body 21 need to be adjusted by the positioning structure 3 to accommodate more people.

[0047] Optionally, the chair-type radioactive internal contamination measuring device can be installed on a movable platform 4, which facilitates moving the measuring device to a desired measuring position, effectively achieving the effect that the measuring device can be flexibly moved and is suitable for on-site emergency handling and movement.

[0048] In a preferred embodiment, the seat structure 1 includes: a seat 11, parallel to the ground, for the detected person to sit; a chair back 12, perpendicular to the seat 11, for shielding radioactive materials behind the detected person; a support frame 13, connected between the seat 11 and the movable platform 4, for supporting the seat 11 and adjusting the height of the seat 11.

[0049] Optionally, the seat structure 1 is used for the detected person to sit or stand, that is, the detected person sits on the seat 11 for measurement, and a seat back 12 is set at the rear end of the seat 11. The seat back 12 is supported by multiple steel structures. The detected person can sit on the seat 11 and lean on the seat back 12. At the same time, the seat back 12 can shield the radioactive materials behind and reduce the impact of the radioactive materials on the measurement results. A support frame 13 is set between the seat 11 and the movable platform 4, which effectively enhances the stability and adjustability of the seat 11.

[0050] In a preferred embodiment, the seat 11 and the seat back 12 are both made of lead plate material, with a stainless steel shell wrapped around the outside of the lead plate material, and the surface of the stainless steel shell on the side of the seat 11 facing the detector structure and the surface of the stainless steel shell on the side of the seat back 12 facing the detector structure are both covered with copper plates.

[0051] Optionally, the seat 11 and the chair back 12 are designed in the form of a stainless steel shell wrapped with a lead plate, that is, the stainless steel plate is first bent and welded to form a cavity of a certain size, and then the lead plate is tightly stacked in the cavity, and finally covered with a stainless steel plate. In addition, the seat 11 and the chair back 12 are each covered with a layer of copper plate on one side facing the detector structure.

[0052] Optionally, the main parts of the seat 11 and the backrest 12 are made of lead plate. Lead is a metal with high density and large atomic number, and has a good shielding effect on radiation such as X-rays and gamma rays. Therefore, in order to better shield radioactive substances, lead plates are used to make the seat 11 and the backrest 12. Stainless steel is a corrosion-resistant, high-strength alloy steel with excellent physical and chemical stability. This stainless steel shell not only increases the structural strength of the seat 11 and the backrest 12, but also provides an aesthetic appearance and an easy-to-clean surface. At the same time, stainless steel also has a certain shielding effect on radiation. Copper can be used to absorb the gamma rays of radioactive lead isotopes and the bremsstrahlung generated by beta rays to further improve the shielding effect. Therefore, on the side of the seat 11 facing the detector structure and the side of the backrest 12 facing the detector structure, the surface of the stainless steel shell is additionally covered with a copper plate.

[0053] Optionally, the seat 11 and the seat back 12 manufactured in the above-mentioned manner can shield a variety of radioactive substances to a greater extent, thereby effectively shielding radioactive substances in the environment.

[0054] In a preferred embodiment, the detector structure includes: a torso detector, which is a high-purity germanium detector or a sodium iodide detector; and a thyroid detector, which is a cadmium zinc telluride detector or a sodium iodide detector.

[0055] Optionally, the torso detector part can use a high-purity germanium detector to provide better energy resolution and low-energy gamma-ray measurement capabilities; High-purity germanium (HPGe) is a high-performance semiconductor material with high sensitivity and high energy resolution. High energy resolution enables it to distinguish radiation of different energies and reduce false alarms and missed alarms. High sensitivity enables it to perform effective measurements even at low radiation levels. At the same time, its crystal structure makes it very sensitive to radiation such as gamma rays, and can accurately measure the energy and intensity of radiation.

[0056] Optionally, a CdZnTe detector can be used for the thyroid detector part to provide better energy resolution and low-energy gamma-ray measurement capabilities; CdZnTe (Cadmium Zinc Te ll ur ide, CZT) is a compound semiconductor material with excellent electrical properties and radiation detection performance. It has high charge collection efficiency and low noise level, which makes it excellent in gamma-ray and X-ray detection. The high charge collection efficiency makes the detector respond to radiation more quickly and accurately, and the low noise level helps to improve the signal-to-noise ratio of the collected pulse signal, making the collected pulse signal clearer. In the process of radiometric imaging, CdZnTe detectors are often used in imaging technologies such as X-ray computed tomography (CT) and positron emission tomography (PET) to provide high-quality pulse signal imaging. Especially in thyroid imaging, due to the high sensitivity of CdZnTe detectors to low-energy X-rays and gamma rays, the structure and function of the thyroid gland can be displayed more clearly.

[0057] In a preferred embodiment, the torso detector shielding body 21 is made of lead plate material, and a stainless steel shell is provided outside the lead plate material; the thyroid detector shielding body 22 is made of lead plate material, and a stainless steel shell is provided outside the lead plate material.

[0058] Optionally, the torso detector shielding body 21 and the thyroid detector shielding body 22 are both made of lead wrapped in a stainless steel shell, which can effectively shield the background radiation interference except for the person being measured; moreover, the torso detector shielding body 21 and the thyroid detector shielding body 22 respectively define the spatial measurement range of the detector structure together with the person being measured, that is, they can cover the body shapes of different persons being measured, and are not directly exposed to radiation outside the shielding body.

[0059] In a preferred embodiment, the positioning structure 3 includes: a vertical column 31, which is installed on the movable platform 4 and is perpendicular to the ground; a horizontal platform 39, which is installed on the vertical column 31 and is parallel to the ground; a traction screw 32, which is arranged on the horizontal platform 39; an annular guide gear 33, which is connected to the traction screw 32, and the torso detector shielding body 21 is nested in the annular guide gear 33; a screw knob 321, which is arranged on the traction screw 32, and the inclination angle of the annular guide gear 33 can be adjusted by rotating the screw knob 321; an annular guide gear knob 331, which is arranged on the outside of the annular guide gear 33, and rotating the annular guide gear knob 331 can control the annular guide gear 33 to rotate along the central axis and drive the torso detector shielding body 21 to rotate.

[0060] Optionally, the vertical column 31 is vertically fixed in the middle of the movable platform 4 and aligned with the axis of the seat structure 1; the horizontal platform 39 is fixedly mounted on the vertical column, and can support the traction screw 32, the annular guide gear 33 and the torso detector shield 21. The traction screw 32 cooperates with the annular guide gear 33 to install the torso detector shield 21 inside the annular guide gear 33 and fasten it to the annular guide gear 33. By adjusting the screw knob 321 to rotate the traction screw 32, the inclination angle of the torso detector shield 21 on the annular guide gear 33 is driven to change, and the measurement of different areas of the human torso can be achieved.

[0061] Optionally, the annular guide gear 33 includes a support body and a rotating column, the rotating column is mounted on the support body, and an annular guide gear knob 331 for adjusting the rotation of the gear is provided on the support body. Specifically, a gear matching the annular guide gear 33 is provided on the annular guide gear knob 331, and the annular guide gear 33 is driven to rotate by rotating the annular guide gear knob 331, so that the rotating column can rotate on the support body along the central axis of the annular guide gear 33, thereby achieving the effect of rotating the torso detector shielding body 21.

[0062] In a preferred embodiment, the positioning structure 3 also includes: a horizontal column 34, which is installed on the vertical column 31, perpendicular to the vertical column 31 and parallel to the ground, and the thyroid detector shielding body 22 is embedded in the horizontal column 34; a rack slide rail 311, which is nested in the groove of the vertical column 31 and connected to the horizontal column 34; a rack sliding adjustment knob 312, which is installed on the rack slide rail 311, and rotating the rack sliding adjustment knob 312 can drive the horizontal column 34 to move along the axial direction of the vertical column 31; a slide rail 35, which is arranged on the surface of the horizontal column 34, passes through the horizontal column 34, so that the thyroid detector shielding body 22 is connected to the external environment, and the slide rail 35 is parallel to the ground; a sliding adjustment knob 36 passes through the slide rail 35 and is fixedly connected to the thyroid detector shielding body 22, and moving the sliding adjustment knob 36 can drive the thyroid detector shielding body 22 to move along the axial direction of the horizontal column 34.

[0063] Optionally, the horizontal column 34 is movably mounted on the vertical column 32, and the horizontal column 34 can move up and down along the vertical column 31. A groove for the rack rail 311 to be embedded is provided on the vertical column 31. The rack rail 311 is fixedly connected to the horizontal column 34, and the gear rail 311 is adjusted to move, so that the horizontal column 34 moves with the gear rail 311. Specifically, a rack sliding adjustment knob 312 meshing with the gear rail 311 is provided, wherein the rack sliding adjustment knob 312 is rotated to move the gear rail 311, thereby realizing the up and down movement of the horizontal column 34. The thyroid detector shielding body 22 carried on the horizontal column 34 is effectively moved up and down to be suitable for people of different heights.

[0064] Optionally, the horizontal column 34 is perpendicular to the vertical column 31, and a groove is provided on the horizontal column 34 so that the thyroid detector shielding body 22 can be embedded in the horizontal column 34. The slide rail 35 is installed on the horizontal column 34, and the position of the slide rail 35 is parallel to the position of the thyroid detector shielding body 22; the sliding adjustment knob 36 vertically passes through the slide rail 35 and is connected to the thyroid detector shielding body 22, and the sliding adjustment knob 36 moves parallel to the slide rail 35, that is, moves horizontally, thereby driving the thyroid detector shielding body 22 to move forward and backward along the slide rail 35.

[0065] Optional, see Figure 2 , Figure 2 It is a schematic diagram of the positioning structure of a chair-type radioactive internal contamination measuring device in Example 1 of the present invention. A moving chain 37 is set on one side of the slide rail 35, and a gear 38 that meshes with the moving chain 37 is set on the sliding adjustment knob 36. The sliding adjustment knob 36 is rotated to make the gear 38 move on the moving chain 37, thereby achieving the effect of driving the thyroid detector shielding body 22 to move forward and backward.

[0066] In a preferred embodiment, the movable platform 4 includes: a stainless steel plate plane 41, used to install the seat structure 1, the detector, the torso detector shield 21, the thyroid detector shield 22 and the positioning structure 3; a support frame, arranged at the bottom of the stainless steel plate plane 41, used to support the stainless steel plate plane 41; universal wheels 42, including multiple ones, installed under the support frame, in contact with the ground, and used to move the stainless steel plate plane 41.

[0067] Optionally, the stainless steel plate plane 41 is parallel to the ground and is used to place the detector structure, the shielding body part (thyroid detector shielding body 22 and torso detector shielding body 21) and the positioning structure 3; the supporting frame is composed of stainless steel square tubes welded horizontally and vertically, and is installed at the bottom of the stainless steel plane to support and prevent the stainless steel plane from deforming; the universal wheels 42 are installed under the supporting frame and distributed at the four corners of the stainless steel plane to move and carry the entire measuring device, and the universal wheels 42 are equipped with a self-locking device for fixing, which effectively prevents the universal wheels from sliding during the measurement process.

[0068] Through the above-mentioned chair-type radioactive internal contamination measuring device, the torso detector shielding body 21 and the thyroid detector shielding body 22 structure are set, and local measurement of the thyroid gland and torso parts can be carried out. At the same time, a movable platform 4 is set, so that the measuring device can be flexibly moved and is suitable for the purpose of on-site emergency transportation and movement, thereby achieving the technical effect of local measurement and easy transportation and movement, and further solving the technical problems that the measurement system in the related technology has a complex structure, is inconvenient to move, and cannot be used for on-site emergency measurement, and the direct measurement method is mostly used for whole-body measurement, and local measurement cannot be carried out, and there are certain limitations in use.

[0069] Example 2

[0070] Based on the above embodiments and optional embodiments, the present invention also proposes an embodiment of a chair-type radioactive internal contamination measurement system. Figure 3 FIG. 1 is a schematic diagram of the structure of a chair-type radioactive internal contamination measurement system in Embodiment 2 of the present invention. Figure 3 As shown, the measurement system includes:

[0071] A measuring module is applied to the above-mentioned chair-type radioactive internal contamination measuring device and is used to obtain measurement data, wherein the measurement data is a pulse signal; a digital multi-channel analyzer is connected to the measuring module and is used to convert the pulse signal into spectrum data; a computer device is connected to the digital multi-channel analyzer and is used to receive the spectrum data and analyze the spectrum data to obtain a measurement result.

[0072] Optionally, the measurement module is composed of a measurement device, wherein the measurement data acquired by the measurement module is the measurement data ultimately output by the detector structure of the measurement device, and the measurement data is a pulse signal formed after a series of processing of the radioactive material information. Among them, the trunk detector and the thyroid detector can be composed of a scintillator detector, and the trunk detector and the thyroid detector both include a detector crystal and a photoelectric conversion device, and the detector crystal is directly coupled to the photoelectric conversion device for amplifying the pulse signal. Specifically, direct coupling refers to directly connecting the output end of the previous circuit part (or element) to the input end of the next circuit part (or element) without transmitting the pulse signal through any capacitor, transformer or other isolation element. This coupling method can amplify and transmit the pulse signal with minimal distortion.

[0073] Optionally, a digital multi-channel analyzer is connected to the detector structure and the computer device to receive the pulse signal acquired by the detector structure and transmit it to the computer device in the form of a spectrum for subsequent measurement.

[0074] In a preferred embodiment, the computer device includes: a spectrum analysis module, connected to a digital multi-channel analyzer, for analyzing the spectrum data to confirm the type and activity of the nuclide; a multi-body detection efficiency correction module, which is preset to include detection efficiency data and detection efficiency curves of various physique groups, and performs fitting calculations based on the physical parameters of the detected person to determine the detection efficiency value, wherein the various physique groups are used to indicate people of different heights and weights; a dose estimation module, connected to the spectrum analysis module and the multi-body detection efficiency correction module, for calculating the internal radiation dose of the detected person according to the type, activity and detection efficiency value of the nuclide to obtain a measurement result; a data management module, connected to the dose estimation module, for storing the measurement results in a preset data management format, and exporting the measurement results for display.

[0075] Optionally, the computer device includes a host, a display and other necessary operating devices, wherein the necessary operating devices include at least a mouse, a keyboard and a power supply. A software module for energy spectrum analysis and dose management is installed in the host. The software module for energy spectrum analysis and dose management mainly includes a spectrum analysis module, a multi-body detection efficiency correction module, a dose estimation module and a data management module. Among them, the spectrum analysis module mainly analyzes the spectrum data collected by the computer equipment to confirm information such as the type of nuclide and the activity of the nuclide; the multi-body detection efficiency correction module has a built-in measurement system for the detection efficiency curve or detection efficiency value of different body shapes of human bodies. It should be noted that the detection efficiency curve or detection efficiency value is preset in the multi-body detection efficiency correction module in advance, and can be fitted and calculated for the physical parameters of the detected person to obtain a more accurate detection efficiency value and improve the accuracy of the measurement results; the dose estimation module is mainly used to calculate the internal radiation dose of the detected person based on the type of nuclide and the activity of the nuclide measured by the spectrum analysis module, as well as the detection efficiency value measured by the multi-body detection efficiency correction module; the data management module is mainly used to store the measurement results in a certain data management format, and provide query, summary, export, printing and other functions.

[0076] Specifically, the detection efficiency value refers to the ratio of the number of radioactive particles that the detector can detect to the total number of radioactive particles actually incident on the detector. In the measurement of radioactive internal contamination, the detection efficiency of the detector will be affected by many factors, such as the physical parameters of the person being detected. Therefore, the multi-physique detection efficiency correction module presets the detection efficiency data and detection efficiency curves for people of various physiques. These data and curves are based on a large number of experimental measurements and data analysis, and can reflect the impact of different physical parameters on the detection efficiency of the detector. When measuring radioactive internal contamination of the person being detected, the module will perform fitting calculations based on the physical parameters of the person being detected (such as height, weight, etc.) to determine a more accurate detection efficiency value.

[0077] According to the above technical solution, a chair-type radioactive internal contamination measurement system is provided. The system is lightweight and movable, and can measure the human thyroid gland, lungs, abdomen, and whole body. It can be used for both conventional measurements and on-site measurements in nuclear emergency scenarios. The present invention can provide a low-cost, multi-functional, and multi-scenario measurement system for the field of internal radiation monitoring.

[0078] The above are only preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A chair-type radioactive internal contamination measuring device, characterized in that: include: A seat structure (1) for the detected person to sit or stand; A detector structure, used to detect the type and content of radioactive substances in the body of the detected person; A torso detector shield (21) is arranged toward the sitting direction of the detected person and is arranged in an elliptical cone shape; the torso detector shield (21) comprises a first end and a second end having a diameter greater than the first end, the first end is oriented toward the detector structure, and the second end is oriented toward the detected person, and the torso detector shield (21) is used to shield radioactive substances in a radiation environment; A thyroid detector shield (22) is disposed toward the sitting direction of the detected person and is higher than the torso detector shield (21). The shield is configured in a cylindrical shape, the central axis of the cylindrical shape is parallel to the ground, and one end of the cylindrical shape is fixedly connected to the detector structure. The thyroid detector shield (22) is used to shield radioactive substances in the radiation environment. A positioning structure (3), connected to the trunk detector shield (21) and the thyroid detector shield (22), and used to adjust the height and angle of the trunk detector shield (21) and the thyroid detector shield (22); A movable platform (4); the seat structure (1), the detector structure, the trunk detector shield (21), the thyroid detector shield (22) and the positioning structure (3) are all mounted on the movable platform (4); and the movable platform (4) is used to move the seat structure (1), the detector structure, the trunk detector shield (21), the thyroid detector shield (22) and the positioning structure (3).

2. The chair-type radioactive internal contamination measuring device according to claim 1, characterized in that: The seat structure (1) comprises: A seat (11), parallel to the ground, for the detected person to sit or stand; A chair back (12), which is perpendicular to the seat (11) and is used to shield radioactive materials behind the detected person; A support frame (13) is connected between the seat (11) and the movable platform (4) and is used to support the seat (11) and adjust the height of the seat (11).

3. The chair-type radioactive internal contamination measuring device according to claim 2, characterized in that: The seat (11) and the chair back (12) are both made of lead plate material, with a stainless steel shell wrapped around the outside of the lead plate material, and the surface of the stainless steel shell on the side of the seat (11) facing the detector structure, and the surface of the stainless steel shell on the side of the chair back (12) facing the detector structure, are both covered with copper plates.

4. The chair-type radioactive internal contamination measuring device according to claim 1, characterized in that: The detector structure comprises: For the trunk detector, use a high-purity germanium detector or a sodium iodide detector; For thyroid detectors, choose cadmium zinc telluride detectors or sodium iodide detectors.

5. The chair-type radioactive internal contamination measuring device according to claim 1, characterized in that: The torso detector shielding body (21) is made of lead plate material, and a stainless steel shell is arranged outside the lead plate material; The thyroid detector shielding body (22) is made of a lead plate material, and a stainless steel shell is arranged outside the lead plate material.

6. The chair-type radioactive internal contamination measuring device according to claim 1, characterized in that: The positioning structure (3) comprises: A vertical column (31) is installed on the movable platform (4) and is perpendicular to the ground; A horizontal platform (39) is installed on the vertical column (31) and is parallel to the ground; A traction screw (32) is arranged on the horizontal platform (39); An annular guide rail gear (33) connected to the traction screw (32), and the trunk detector shielding body (21) is nested in the annular guide rail gear (33); A screw knob (321) is arranged on the traction screw (32), and the inclination angle of the annular guide gear (33) can be adjusted by rotating the screw knob (321); The annular guide gear knob (331) is arranged outside the annular guide gear (33), and the annular guide gear knob (331) can be rotated to control the annular guide gear (33) to rotate along the central axis.

7. The chair-type radioactive internal contamination measuring device according to claim 6, characterized in that: The positioning structure (3) further comprises: A horizontal column (34) is installed on the vertical column (31), is perpendicular to the vertical column (31) and is parallel to the ground, and the thyroid detector shielding body (22) is embedded in the horizontal column (34); A rack slide rail (311) is nested in the groove of the vertical column (31) and connected to the horizontal column (34); A rack sliding adjustment knob (312) is mounted on the rack slide rail (311), and rotating the rack sliding adjustment knob (312) can drive the horizontal column (34) to move along the axial direction of the vertical column (31); A slide rail (35) is arranged on the surface of the horizontal column (34), penetrates the horizontal column (34), and enables the thyroid detector shielding body (22) to communicate with the external environment, and the slide rail (35) is parallel to the ground; The sliding adjustment knob (36) passes through the slide rail (35) and is fixedly connected to the thyroid detector shielding body (22). By moving the sliding adjustment knob (36), the thyroid detector shielding body (22) can be driven to move along the axial direction of the horizontal column (34).

8. The chair-type radioactive internal contamination measuring device according to claim 1, characterized in that: The movable platform (4) comprises: A stainless steel plate plane (41) for mounting the seat structure (1), the detector structure, the torso detector shield (21), the thyroid detector shield (22) and the positioning structure (3); A supporting frame, arranged at the bottom of the stainless steel plate plane (41) and used for supporting the stainless steel plate plane (41); The universal wheels (42) include a plurality of universal wheels, which are installed below the support frame and contact the ground, and are used to move the stainless steel plate plane (41).

9. A chair-type radioactive internal contamination measurement system, characterized in that: include: A measuring module, applied to a chair-type radioactive internal contamination measuring device as described in claims 1 to 8 above, for obtaining measurement data, wherein the measurement data is a pulse signal; A digital multi-channel analyzer, connected to the measurement module, for converting the pulse signal into spectrum data; The computer device is connected to the digital multi-channel analyzer and is used to receive the spectrum data and analyze the spectrum data to obtain the measurement result.

10. The chair-type radioactive internal contamination measurement system according to claim 9, characterized in that: The computer device comprises: A spectrum analysis module, connected to the digital multi-channel analyzer, for analyzing the spectrum data to confirm the nuclide type and nuclide activity; The multi-physique detection efficiency correction module is preset with detection efficiency data and detection efficiency curves of various physique groups, and performs fitting calculations based on the physical parameters of the detected person to determine the detection efficiency value, wherein the various physique groups are used to indicate people of different heights and weights; a dose estimation module, connected to the spectrum analysis module and the multi-body detection efficiency correction module, for calculating the internal radiation dose of the detected person according to the nuclide type, the nuclide activity and the detection efficiency value, and obtaining a measurement result; A data management module is connected to the dose estimation module and is used to store the measurement results in a preset data management format and export and display the measurement results.

Images