CN115390122A - Detection device for detecting orientation of radioactive source - Google Patents

Abstract

The invention discloses a detection device for detecting the position of a radioactive source, which comprises a circular shell, wherein a main control board, a detector and a shielding block are arranged in the shell, the shielding block consists of an upper shielding lead block and a lower shielding lead block which are fixedly connected, the upper shielding lead block and the lower shielding lead block are both arc-shaped and are respectively arranged on two sides of the central line of the shielding block, the thickness of the upper shielding lead block is gradually increased from left to right, and the thickness of the lower shielding lead block is gradually decreased from left to right; the two detectors are respectively an upper detector and a lower detector, the upper detector and the lower detector are cylindrical and arranged in an upper and lower mode and are respectively arranged in a semi-enclosed space formed by an upper shielding lead block and a lower shielding lead block; each detector is connected with the main control panel and used for collecting gamma rays in the environment, generating pulse numbers and transmitting the pulse numbers to the main control panel, and the main control panel judges the position of the gamma rays emitted by the radioactive source according to the pulse numbers fed back by the detectors and the lead attenuation thickness corresponding to the collected gamma rays.

Description

Detection device for detecting orientation of radioactive source

Technical Field

The invention relates to the field of detection equipment, in particular to a detection device for detecting the direction of a radioactive source.

Background

The radioactive source is widely applied to various fields of national economy, including industry, agriculture, medicine and the like, which greatly benefits human beings, but the radioactive source can release high-energy rays or particles, such as gamma rays, neutrons and the like, so that ionizing radiation is caused, cell tissues of the human body are damaged, and the human body is injured; the radioactive source is leaked, lost or stolen, and the use of the radioactive source has potential danger, so that the radioactive source needs to be strictly managed and effectively monitored or monitored, and when the radioactive source is leaked, lost or stolen, the radioactive source can be quickly searched and positioned to reduce the harm brought by the radioactive source.

At present, in the conventional radiation source positioning, carpet search is generally carried out on a suspected area by a person or a vehicle, and the position of the radiation source is determined according to the change condition of the dose rate. The method has the defects of easy contamination of storage personnel and low source searching efficiency.

The prior Chinese patent with publication number 110794443 discloses a detector device for quickly and accurately positioning a radioactive source and a positioning method thereof. Wherein, main part shielding mechanism is the cylinder that a plurality of mounting grooves evenly were equipped with to upper end circumference, all installs a radiation detector in every mounting groove, during the use, through a plurality of detectors and shielding structure's reasonable combination, carries out the accuracy to the dose rate of equidirectional not and measures to adopt circuit electronic system to calculate the dose rate of equidirectional not, finally the position of accurately deriving the radiation source. The device position identification is related to the detector quantity, and every detector corresponds a direction of measurement, consequently need measure with a plurality of detectors when measuring the position precision higher to cause position measuring device bulky, shortcoming such as weight is heavier. Meanwhile, the device has a complex overall structure and high manufacturing cost, and is not suitable for large-scale popularization.

Disclosure of Invention

In view of the above-mentioned shortcomings of the prior art, the present invention provides a detection device for detecting the orientation of a radioactive source, which has low cost and simple structure and can detect the specific orientation and angle of the emission source.

In order to solve the technical problems, the invention adopts the following technical scheme:

a detection device for detecting the position of a radioactive source comprises a shell in a circular box shape, wherein a main control board, a detector and a shielding block are arranged in the shell, and the detection device is characterized in that the shielding block consists of an upper shielding lead block and a lower shielding lead block which are fixedly connected, the upper shielding lead block and the lower shielding lead block are both in an arc shape and are respectively arranged on two sides of the central line of the shielding block, the thickness of the upper shielding lead block is gradually increased from left to right, and the thickness of the lower shielding lead block is gradually decreased from left to right; the two detectors are respectively an upper detector and a lower detector, are cylindrical and are arranged up and down and are respectively arranged in a semi-enclosed space formed by an upper shielding lead block and a lower shielding lead block; each detector is connected with the main control board and used for collecting gamma rays in the environment, generating pulse numbers and transmitting the pulse numbers to the main control board, and the main control board judges the position of the gamma radiation rays emitted by the radioactive source according to the pulse numbers fed back by the detectors and the attenuation thickness of lead corresponding to the collected gamma rays. In this way, during detection, the device is horizontally placed in the detected area, and the detection device responds to and collects gamma rays in the environment. The thickness of the upper shielding lead block and the thickness of the lower shielding lead block are gradually increased or reduced from one side to the other side, and after the arrangement is adopted, when gamma radiation emitted by a radioactive source penetrates through the shielding blocks, the change of the thickness of the lead shielding can be realized according to the difference of incidence angles of the gamma radiation, so that the reading size of an internal detector is influenced. And finally, calculating the shielding thickness and the attenuation multiple according to the reading of the detector, and calculating the angle corresponding to the gamma radiation according to the obtained shielding thickness. The thicknesses of the upper shielding lead block and the lower shielding lead block are uniformly changed, and half of the upper detector and half of the lower detector are not surrounded by the shielding blocks, so that the pulse numbers detected by the upper detector and the lower detector are shielded, one pulse number is not shielded, the reading number detected by the unshielded detector is large, the reading number detected by the shielded detector is small, the approximate position of the unshielded detector is determined according to the reading number, and finally, the position of the radioactive source is calculated through the numerical values of the two detectors.

Furthermore, the shielding block is arranged below the main control board, and the upper shielding lead block and the lower shielding lead block are both semicircular. Therefore, the upper shielding lead block and the lower shielding lead block have the same shape and the same thickness change value, so that the calculation of the lead shielding thickness is facilitated.

Further, the casing comprises the box body down that is the bottle lid form and the sealed lid of going up of installation box body opening side down, adopts low atomic number aluminum alloy material to make and forms. Therefore, after the shell is made of the materials, the shell is low in density, high in corrosion resistance, good in conductivity and high in strength, and the weight of an instrument is reduced as much as possible on the premise that the strength is guaranteed so as to meet the requirement of portability.

Furthermore, twelve direction indicator lights electrically connected with the main control board are uniformly arranged on the upper sealing cover in the circumferential direction. Therefore, the angle between every two adjacent position indicating lamps is 30 degrees, and after the main control board determines the position of the radioactive source according to calculation, the main control board can control the two corresponding position indicating lamps to be lightened, so that the position of the radioactive source can be visually displayed for a user.

Furthermore, an alarm is arranged on the shell and connected with the main control board. Therefore, when the detector detects that the radioactive source exists, the main control board can power on the alarm to control the alarm to give an alarm and remind a user.

Furthermore, a plurality of batteries are arranged in the shell and electrically connected with the main control board to supply power to the main control board. Therefore, the battery can supply power to the main control panel, the battery size is small, and the power supply is convenient.

Furthermore, a convex cover is further arranged on the shell, a display screen and a control button are arranged on the convex cover, and the display screen and the control button are electrically connected with the main control board. In this way, the arranged display screen can display the direction and the received maximum pulse count, information display is provided for users, and the arranged control buttons can be used for operations such as power-on of users.

Furthermore, an arc-shaped handle is arranged on the convex cover, and two ends of the handle are rotatably connected with the convex cover. Therefore, the handle is convenient for a user to lift the device and move.

Furthermore, a power supply/charging socket and a debugging socket are arranged at the lower end of the shell, and the power supply/charging socket and the debugging socket are electrically connected with the main control panel. Therefore, the set charging socket charges the battery, the external power supply can supply power after the charging socket is connected with the power supply socket, the battery is charged, and the main control board program can be downloaded after the charging socket is connected with the debugging socket.

Further, after the main control board receives the pulse numbers of the upper shielding lead block and the lower shielding lead block, according to the position where the detection device is placed, if one side corresponding to the radioactive source is positioned in the upper shielding lead block or the lower shielding lead block, the pulse number detected by the shielding lead block is smaller, and the pulse number detected by the other shielding lead block is larger, so that the main control board can determine the approximate position of the radioactive source according to the pulse numbers; after the approximate position of the radioactive source is determined, the shielding thickness value of the corresponding shielding lead block is determined according to the ratio of the pulse numbers detected by the upper detector and the lower detector, the angle of gamma radiation emitted by the radioactive source is obtained, and the accurate position of the radioactive source is further determined. Thus, the approximate orientation is determined, the mask thickness value is determined and calculated according to the obtained pulse number, and finally the accurate orientation is determined.

Compared with the prior art, the invention has the following beneficial effects:

1. the detector adopts a crystal detector, has a radioactive source recognition function, can quickly respond to low-dose radiation rays, and can realize quick positioning of the radioactive sources under low dose.

2. The number of the adopted detectors is 2, and the measurement of a plurality of directions can be realized through a small number of detectors, so that the volume and the weight of the detectors are reduced.

Drawings

FIG. 1 is a schematic cross-sectional view of a detecting device according to an embodiment;

FIG. 2 is a schematic perspective view of an exemplary embodiment of a probe apparatus;

FIG. 3 is a schematic perspective view of an embodiment of a probe and shielding block assembly;

fig. 4 is a schematic perspective view of a shielding block in an embodiment.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another, and are not to be construed as indicating or implying relative importance. Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined. In the description of the present invention, it should also be noted that, unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.

As shown in fig. 1-4, the present embodiment provides a detection device for detecting the orientation of a radioactive source, which includes a casing 1 in a shape of a circular box, a main control board 4, a detector 3 and a shielding block 2 are disposed in the casing 1, the shielding block 22 is composed of an upper shielding lead block 21 and a lower shielding lead block 22 which are fixedly connected, the upper shielding lead block 21 and the lower shielding lead block 22 are both in an arc shape and are respectively disposed on two sides of a center line of the shielding block 2, the thickness of the upper shielding lead block 21 is gradually increased from left to right, and the thickness of the lower shielding lead block 22 is gradually decreased from left to right; the two detectors 3 are respectively an upper detector 31 and a lower detector 32, the upper detector 31 and the lower detector 32 are both cylindrical and arranged in an upper-lower manner and are respectively arranged in a semi-enclosed space formed by the upper shielding lead block 21 and the lower shielding lead block 22; each detector 3 is connected with the main control board 4 and is used for collecting gamma rays in the environment, generating pulse numbers and transmitting the pulse numbers to the main control board 4, and the main control board 4 judges the direction of gamma radiation rays emitted by the radioactive source according to the pulse numbers fed back by each detector 3 and the attenuation thickness of lead corresponding to the collected gamma rays.

The shielding block 2 is arranged below the main control board 4, and the upper shielding lead block 21 and the lower shielding lead block 22 are both semicircular.

The shell 1 is composed of a lower box body 11 with an opening at the upper end and a cross section in an annular shape and an upper sealing cover 12 arranged on the opening side of the lower box body 11, and is made of aluminum alloy materials with low atomic number. Twelve azimuth indicator lamps 5 electrically connected with the main control board 4 are uniformly arranged on the upper sealing cover 12 in the circumferential direction.

Still be equipped with an alarm 8 on casing 1, be equipped with a plurality of batteries 9 in the casing, alarm 8 and battery 9 all meet with main control board 4, and battery 9 can be for the power supply of alarm 8. A convex cover 13 is further arranged on the shell 1, a display screen 6 and a control button 7 are arranged on the convex cover 12, and the display screen 6 and the control button 7 are both electrically connected with the main control board 4.

For convenience of use, an arc-shaped handle is further arranged on the convex cover 12, and both ends of the handle are rotatably connected with the convex cover 12.

The lower end of the shell 1 is provided with a debugging socket and a power socket or a charging socket, and the power socket, the charging socket and the debugging socket are all electrically connected with the main control board 4.

After the main control board 4 receives the pulse numbers of the upper shielding lead block 21 and the lower shielding lead block 22, according to the position where the detection device is placed, if one side corresponding to the radioactive source is positioned in the upper shielding lead block 21 or the lower shielding lead block 22, the pulse number detected by the shielding lead block is smaller, and the pulse number detected by the other shielding lead block is larger, so that the main control board 4 can determine the approximate position of the radioactive source according to the pulse numbers; after the approximate position of the radioactive source is determined, the shielding thickness value of the corresponding shielding lead block is determined according to the ratio of the pulse numbers detected by the upper detector 31 and the lower detector 32, the angle of the gamma radiation emitted by the radioactive source is calculated, and the accurate position of the radioactive source is further determined.

When the device is used, the device is horizontally placed in a detected area, and the detector responds to and collects gamma rays in the environment. The upper detector and the lower detector are shielded by a semicircular lead shielding body, when the radioactive source is positioned on the north side, the upper lead plate can shield the radiation dose, so that the reading of the upper detector is small, and the lower detector is in a lead-free device shielding state and normally reads. At the moment, the radioactive source can be judged to be positioned in the north, the corresponding lead shielding thickness is obtained according to the ratio of the readings of the upper detector and the lower detector, the attenuation multiple Ksb = the reading of the upper detector/the reading of the lower detector =2^ (R/a), a is the half-value layer thickness of different radioactive sources, the corresponding radioactive source is obtained through nuclide identification, the value a is obtained, R is the lead attenuation thickness, and R can be calculated through the formula. And correspondingly and uniformly changing the thickness value of the lead device to obtain a corresponding angle.

When the radioactive source ray reaches the detector, because the upper and lower detectors adopt shielding structural members of which the semicircles are gradually thickened, when the reading of the upper detector is larger, the position of the radioactive source can be judged to be 180 degrees of the upper non-shielding structural member, and the thickness R value is calculated by the attenuation multiple Ksb = the upper detector reading/the lower detector reading =2^ (R/a), wherein a is the thickness of the attenuation semivalue layer of the lead corresponding to the type of the radioactive source.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the technical solutions, and those skilled in the art should understand that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all that should be covered by the claims of the present invention.

Claims (10)

1. A detection device for detecting the position of a radioactive source comprises a shell in a circular box shape, wherein a main control board, a detector and a shielding block are arranged in the shell, and the detection device is characterized in that the shielding block consists of an upper shielding lead block and a lower shielding lead block which are fixedly connected, the upper shielding lead block and the lower shielding lead block are both in an arc shape and are respectively arranged on two sides of the central line of the shielding block, the thickness of the upper shielding lead block is gradually increased from left to right, and the thickness of the lower shielding lead block is gradually decreased from left to right; the two detectors are respectively an upper detector and a lower detector, are cylindrical and are arranged up and down and are respectively arranged in a semi-enclosed space formed by an upper shielding lead block and a lower shielding lead block; each detector is connected with the main control panel and used for collecting gamma rays in the environment, generating pulse numbers and transmitting the pulse numbers to the main control panel, and the main control panel judges the position of the gamma rays emitted by the radioactive source according to the pulse numbers fed back by the detectors and the lead attenuation thickness corresponding to the collected gamma rays.

2. The detecting device for detecting the orientation of a radioactive source as claimed in claim 1, wherein the shielding block is disposed under the main control board, and the upper shielding lead block and the lower shielding lead block are semicircular.

3. A detecting device for detecting the orientation of a radioactive source as claimed in claim 1 or 2, wherein the casing is composed of a lower case body in the shape of a bottle cap and an upper sealing cover mounted on the opening side of the lower case body, and is made of a low atomic number aluminum alloy material.

4. A detecting device for detecting the orientation of a radioactive source as claimed in claim 3, wherein twelve orientation indicating lamps electrically connected to the main control board are uniformly arranged on the upper sealing cover in the circumferential direction.

5. The detecting device for detecting the orientation of a radioactive source according to claim 1, 2 or 4, wherein an alarm is further provided on the housing, and the alarm is connected to the main control board.

6. A detection apparatus according to claim 5, wherein a plurality of batteries are provided within the housing, the batteries being electrically connected to the main control board for powering the main control board.

7. A detector as claimed in claim 6, wherein a convex cover is provided on the casing, a display screen and control buttons are provided on the convex cover, and the display screen and control buttons are electrically connected to the main control panel.

8. The apparatus as claimed in claim 6 or 7, wherein an arc-shaped handle is further provided on the convex cover, and both ends of the handle are rotatably connected to the convex cover.

9. The apparatus of claim 1, 2, 4, 6 or 7, wherein a debugging socket and a power socket or a charging socket are disposed at the lower end of the casing, and the power socket, the charging socket and the debugging socket are electrically connected to the main control board.

10. The detecting device for detecting the orientation of a radioactive source according to claim 1, 2, 4, 6 or 7, wherein after the main control board receives the pulse numbers of the upper shielding lead block and the lower shielding lead block, according to the orientation of the detecting device, if the side corresponding to the radioactive source is located in the upper shielding lead block or the lower shielding lead block, the pulse number detected by the shielding lead block is smaller, and the pulse number detected by the other shielding lead block is larger, so that the main control board can determine the approximate orientation of the radioactive source according to the pulse numbers; after the approximate position of the radioactive source is determined, the shielding thickness value of the corresponding shielding lead block is determined according to the ratio of the pulse numbers detected by the upper detector and the lower detector, the angle of gamma radiation emitted by the radioactive source is obtained, and the accurate position of the radioactive source is further determined.

Images