A shielding performance detection device and method for a shielding container

Abstract

The application belongs to the technical field of high-energy ray shielding detection, and discloses a shielding container shielding performance detection device and method, the device comprises a shielding container, a thermoluminescence dosimeter, a detection source shielding sleeve, and a detection source, the detection source shielding sleeve is arranged outside the shielding container, the detection source is arranged inside the detection source shielding sleeve, the shielding container is provided with a plurality of detection points, and the inner surface of each detection point is pasted with a thermoluminescence dosimeter, and the method utilizes the device to detect the shielding performance. According to the application, a plurality of detection points are arranged inside the shielding container, a thermoluminescence dosimeter is arranged inside each detection point, gamma ray output is carried out by using the detection source on the outside, and then the reference value is obtained by using a shielding dose equivalent calculation formula, so that the shielding performance of the point can be detected.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of high-energy ray shielding detection, and particularly relates to a shielding container shielding performance detection device and method. BACKGROUND

[0002] In modern industrial production, food production, medical detection and treatment and nuclear industry, radioactive sources are often used, and shielding containers are needed for use and transportation of the radioactive sources. In order to ensure the safety of the radioactive sources during use and transportation, the shielding performance of the shielding containers needs to be detected after manufacturing to verify that the shielding performance meets the design requirements.

[0003] The existing shielding container shielding performance detection technology generally measures or calculates the dose rate of a detection source with appropriate energy and activity, then positions a source delivery tube of the detection source inside the shielding container, places a detection instrument on the outer surface of the shielding container corresponding to the detection source after the detection source is output from the source delivery tube, and reads the dose rate of the outer surface of the shielding container through the instrument. The shielding performance of the shielding container is determined by comparing and analyzing the dose rate of the detection source and the dose rate of the detection source after being shielded by the shielding container.

[0004] At present, the existing detection technology has the following problems:

[0005] Firstly, for a shielding container with a small internal space or small inlet and outlet size, the source delivery tube of the detection source cannot enter the internal space of the shielding container, and the shielding performance cannot be detected.

[0006] Secondly, for a shielding container with a shielding cover or a shielding door, the detection source cannot be arranged at the joint between the shielding cover or the shielding door and the main body of the shielding container, and the shielding performance cannot be detected under the actual use condition. SUMMARY

[0007] The application aims to overcome the defects of the prior art, and provides a shielding container shielding performance detection device and method for shielding detection of a shielding container with a small internal cavity and a small-diameter inlet and outlet channel.

[0008] In order to achieve the above-mentioned purpose, the application provides the following technical scheme:

[0009] In a first aspect, the application provides a shielding container shielding performance detection device, which comprises a shielding container, a thermoluminescence dosimeter, a detection source shielding sleeve, and a detection source. The detection source shielding sleeve is arranged outside the shielding container, the detection source is arranged inside the detection source shielding sleeve, and the shielding container is provided with a plurality of detection points. The inner surface of each detection point is pasted with the thermoluminescence dosimeter.

[0010] In some embodiments, the detection device further comprises a workbench, and the shielding container is arranged on the workbench.

[0011] In some embodiments, the workbench is provided with an adjusting screw, and the adjusting screw is provided with a shielding sleeve support connected to the detection source shielding sleeve for adjusting the position of the detection source shielding sleeve.

[0012] In some embodiments, the workbench is provided with a plurality of screw mounting holes, and the adjusting screw is mounted in the screw mounting hole.

[0013] In some embodiments, the detection points are arranged on the bottom and the side wall of the shielding container, and the detection points are provided with marks.

[0014] In some embodiments, the shielding container is provided with a mark, and the center of the detection source shielding sleeve is aligned with the mark.

[0015] In some embodiments, the detection source is provided with a source guide tube, one end of the source guide tube is connected to the detection source shielding sleeve, and the other end of the source guide tube is connected to a source machine.

[0016] In a second aspect, the application provides a shielding container shielding performance detection method, comprising:

[0017] S1: arranging the shielding container on the workbench;

[0018] S2: setting corresponding marks on the internal and external surface detection points of the shielding container, and making corresponding adhesive labels of the marks and sticking them at the detection points;

[0019] S3: after the marks at the detection positions are all set, installing a thermoluminescence dosimeter at the internal detection point, and restoring the shielding container to a working state;

[0020] S4: installing a shielding sleeve support on the outside of the shielding container, sequentially installing detection source shielding sleeves outside each detection position through the shielding sleeve support, adjusting the position of the detection source shielding sleeve through the adjusting screw, and aligning the center of the detection source shielding sleeve with the mark on the outside of the shielding container;

[0021] S5: installing a source guide tube of a detection source in the detection source shielding sleeve, positioning the center of the source guide tube at a corresponding point on the external surface of the shielding container through the detection source shielding sleeve, outputting the detection source through the source guide tube, monitoring the field radiation dose level during the transportation of the detection source, and determining the field control area and the supervision area;

[0022] S6: after the detection source is output, timing, irradiating the thermoluminescence dosimeter at the corresponding point for a specified period of time, and after the irradiation is completed, withdrawing the detection source;

[0023] S7: opening the shielding container, taking out the thermoluminescence dosimeter, and sticking an adhesive label at the detected point.

[0024] S8: repeating steps S3-S7 until detection of all detection points is completed, and then reading out the dose equivalent rate of all detection points;

[0025] S9: judging whether the shielding performance of each point is qualified.

[0026] In some embodiments, the dose equivalent rate of the thermoluminescence dosimeter is read out by a thermoluminescence dosimetry device.

[0027] In some embodiments, the total attenuation times of the shielding lead layer and the steel layer of each detection point of the shielding container are calculated, the reference dose equivalent rate in a unit detection time is calculated according to the shielding dose equivalent calculation formula, and whether the shielding performance of each point is qualified is obtained by comparing the reference dose equivalent rate with the actually calculated dose equivalent rate.

[0028] Compared with the prior art, the shielding performance detection device and method of the shielding container provided by the present application have the following beneficial effects:

[0029] The present application sets multiple detection points inside the shielding container, and sets thermoluminescence dosimeters inside the detection points. The gamma ray output is performed outside by using a detection source, and then the reference value is obtained by using the shielding dose equivalent calculation formula, so that the shielding performance of the point can be detected. The present application is suitable for shielding containers with small internal space or small import and export size, and avoids the situation that the shielding performance of shielding containers with shielding covers or shielding doors cannot be detected under simulated actual use conditions, thereby improving the practicability.

[0030] The present application sets thermoluminescence dosimeters and radioactive sources in sequence, respectively measures the dose equivalent rates of multiple detection points, and compared with the method of placing a large number of thermoluminescence dosimeters at the same time, the superimposed influence of the radioactive sources at other positions during irradiation can be effectively prevented, and the probability of false detection and missed detection is effectively reduced by using the labeling method, thereby improving the detection accuracy.

[0031] When the detection source shielding sleeve is set, the present application adds a passive simulation operation, which effectively improves the accuracy and safety of the positioning of the detection source shielding sleeve, and reduces the subsequent actual detection operation failure rate.

[0032] The detection source shielding sleeve of the present application is supported by an adjusting screw and a shielding sleeve support, the adjusting screw is installed in the elongated hole of the workbench, and the setting position of the shielding sleeve can be flexibly adjusted, thereby increasing the applicability. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the present application, the following will briefly introduce the drawings needed to be used in the technical description.

[0034] Figure 1The front view of the shielding performance detection device for the shielding container provided in Embodiment 1 of the present application, wherein part of the structure is shown in cross section;

[0035] Figure 2 The top view of the shielding performance detection device for the shielding container provided in Embodiment 1 of the present application;

[0036] Figure 3 The arrangement of the detection points provided in Embodiment 1 of the present application Figure 1 ;

[0037] Figure 4 The arrangement of the detection points provided in Embodiment 1 of the present application Figure 2 , which has a different view angle Figure 3 ;

[0038] Figure 5 The front view of the shielding performance detection device for the shielding container provided in Embodiment 2 of the present application, wherein part of the structure is shown in cross section;

[0039] Figure 6 The top view of the shielding performance detection device for the shielding container provided in Embodiment 2 of the present application;

[0040] Figure 7 The arrangement of the detection points provided in Embodiment 2 of the present application Figure 1 ;

[0041] Figure 8 The arrangement of the detection points provided in Embodiment 2 of the present application Figure 2 , which has a different view angle Figure 7 ;

[0042] Figure 9 The flow chart of the shielding performance detection method for the shielding container provided in the present application.

[0043] Explanation of reference numerals:

[0044] 1, shielding container; 2, thermoluminescence dosimeter; 3, detection source shielding sleeve; 4, detection source; 5, shielding sleeve support; 6, adjusting screw; 7, workbench; 8, screw mounting hole. DETAILED DESCRIPTION

[0045] The following is further described in detail through specific embodiments.

[0046] As shown in Figures 1 to 8 , the present application provides a shielding performance detection device for a shielding container, which comprises a shielding container 1, a thermoluminescence dosimeter 2, a detection source shielding sleeve 3, a detection source 4, a shielding sleeve support 5, an adjusting screw 6 and a workbench 7. The shielding container 1 is arranged on the workbench 7, the adjusting screw 6 is arranged on the workbench 7, and the shielding sleeve support 5 is arranged on the adjusting screw 6.

[0047] The shielding container 1 has a "Z" type through hole or slit. The inner surface and the outer surface of the shielding container 1 are provided with a plurality of detection points, such as A01, A02, A03, A04, A05, A06, A07 and A08 as shown in Figure 3 and Figure 4 The detection points include B01, B02, B03, B04, B05, B06, B07 and B08 as shown in Figure 7 and Figure 8 The detection points include B01, B02, B03, B04, B05, B06, B07 and B08 as shown in

[0048] The detection points are selected at the container body, the through hole and the slit, which can detect the shielding capacity of the container body and the shielding capacity of the weak part of the container, and comprehensively evaluate the shielding effect of the container. The inner surface of the detection point is pasted with a thermoluminescence dosimeter 2, and the outer surface is irradiated by a detection source. The actual shielding thickness is calculated by counting the thermoluminescence dosimeter 2.

[0049] Specifically, the bottom is provided with a detection point, and the side wall is also provided with a plurality of detection points. The positions of the detection points are provided with corresponding marks, and the inner and outer surfaces of the shielding container 1 can be provided with marks. A detection source shielding sleeve 3 is arranged outside the detection point (the outer surface of the shielding container 1), the detection source shielding sleeve 3 is installed and fixed by a shielding sleeve support 5, the shielding sleeve support 5 is connected with an adjusting screw 6 and adjusts the position of the shielding sleeve support 5 through the adjusting screw 6, so as to adjust the position of the detection source shielding sleeve 3, so that the center of the detection source shielding sleeve 3 is aligned with the mark outside the shielding container 1.

[0050] The detection source 4 is arranged in the detection source shielding sleeve 3, and the guide source pipe of the detection source 4 extends outward from the detection source shielding sleeve 3. One end of the guide source pipe is connected with a source machine, and the other end is connected with the detection source shielding sleeve 3. The radioactive source enters the detection source shielding sleeve 3 from the source machine through the guide source pipe.

[0051] The arrangement position of the shielding sleeve support 5 can be multiple, such as Figure 1 or Figure 5 In actual use, only one shielding sleeve support 5 can be used.

[0052] Further, a plurality of screw mounting holes 8 are arranged on the workbench 7 in multiple directions, and the detection source shielding sleeve 3 can be installed in multiple directions. Specifically, the shielding sleeve support 5 is installed on the screw mounting hole 8, and the detection source shielding sleeve 3 is installed on the shielding sleeve support 5. The installation position of the detection source shielding sleeve 3 is adjusted by adjusting the installation position of the shielding sleeve support 5.

[0053] The detection source shielding sleeve 3 is supported by the shielding sleeve support 5 and the adjusting screw 6, and the working height of the detection source shielding sleeve 3 can be adjusted within a certain range.

[0054] Optionally, the thermoluminescence dosimetry patch 2 adopts an existing thermoluminescence dosimetry patch.

[0055] In addition, as Figure 9 shown, the application also provides a shielding container shielding performance detection method, comprising:

[0056] S1: hoist the shielding container 1 to the workbench 7 by the hoisting equipment;

[0057] S2: after the shielding container 1 is positioned on the workbench 7, the corresponding marks are set on the inner and outer surface detection points of the shielding container 1 according to certain rules (for example, at the container through holes or gaps), and the corresponding adhesive labels of the marks are made and pasted at the detection points;

[0058] S3: after the setting of the marks at the detection positions is completed, the internal detection point position is installed with the fixed thermoluminescence dosimeter 2, and then the shielding container 1 is restored to the working state;

[0059] S4: the shielding sleeve support 5 is installed outside the shielding container 1, the detection source shielding sleeve 3 is installed outside each detection position in turn through the shielding sleeve support 5, and the position of the detection source shielding sleeve 3 is adjusted through the adjusting screw 6 to make the center thereof aligned with the outer mark of the shielding container 1;

[0060] S5: the guide source pipe of the detection source 4 is installed in the corresponding detection source shielding sleeve 3, so that the center of the guide source pipe of the detection source 4 is positioned at the corresponding point of the outer surface of the shielding container through the detection source shielding sleeve 3, and the alignment with the thermoluminescence dosimeter 2 is realized; the guide source pipe outputs the detection source 4, and monitors the field radiation dose level in the conveying process of the detection source 4 to determine the field control area and the supervision area;

[0061] S6: after the output of the detection source 4, the timer is used for timing, the thermoluminescence dosimeter 2 at the corresponding point is irradiated for a specified time, after the irradiation is completed, the detection source 4 is withdrawn; wherein the detection unit time can be adjusted according to the energy and activity of different types of detection sources 4;

[0062] S7: after the detection source 4 is withdrawn, the shielding container 1 is opened, the thermoluminescence dosimeter 2 is taken out, and the adhesive label is pasted at the position of the thermoluminescence dosimeter 2 and the detected point of the shielding container 1 for remarking;

[0063] S8: the steps of steps S3 to S7 are repeated until the detection of all detection points is completed, and then the dose equivalent rate of all thermoluminescence dosimeters 2 at the detection points is read out by the thermoluminescence dosimeter measuring device;

[0064] S9: Calculate the total attenuation factor of the lead and steel layers at each test point of the shielding container 1 according to the design drawings and formulas, and calculate the reference dose equivalent rate per unit test time according to the formula for calculating the shielding dose equivalent. Then, compare the reference dose equivalent rate with the actual calculated dose equivalent rate to determine whether the shielding performance of each point is qualified.

[0065] Example 1

[0066] like Figures 1 to 4 As shown, the shielding container 1 in this embodiment is an A-type shielding container with a shielding door. The shielding performance testing device for the shielding container provided in this embodiment includes the shielding container 1 (A-type shielding container), a thermoluminescent dosimeter 2, a detection source shielding sleeve 3, a detection source 4, a shielding sleeve bracket 5, an adjusting screw 6, and a worktable 7. The connection relationships of each structure are as described above and will not be repeated here.

[0067] It should be noted that during use, the detection point should be selected based on the actual location of the radiation source within the container.

[0068] Furthermore, based on the aforementioned shielding container shielding performance testing device, this application also provides a shielding container shielding performance testing method, comprising:

[0069] S1: Use lifting equipment to hoist the shielding container 1 (A shielding container) onto the workbench 7;

[0070] S2: After the shielding container 1 is positioned on the workbench 7, set corresponding marks at the detection points on the inner and outer surfaces of the shielding container 1 according to the rules, and make corresponding adhesive labels.

[0071] S3: After all the markings at the detection locations are set, install and fix the thermoluminescent dosimeter 2 at the internal detection locations, and then restore the shielding container 1 to its working state.

[0072] S4: Install the shielding sleeve bracket 5 on the outside of the shielding container 1, and install the detection source shielding sleeve 3 on the outside of each detection location point in sequence through the shielding sleeve bracket 5. Adjust the position of the detection source shielding sleeve 3 by adjusting the screw 6 so that its center is aligned with the external marking of the shielding container 1.

[0073] S5: Install the source tube of the detection source 4 into the corresponding detection source shielding sleeve 3, so that the center of the source tube of the detection source 4 is positioned at the corresponding point on the outer surface of the shielding container 1 through the detection source shielding sleeve 3, so as to achieve alignment with the thermoluminescent dosimeter 2; the source tube outputs the detection source 4, and monitors the on-site radiation dose level during the delivery of the detection source 4 to determine the on-site control zone and supervision zone;

[0074] S6: After the output of the detection source 4, the timer is used to start the timing and the thermoluminescent dosimeter 2 at the corresponding point is irradiated for the specified duration. After the irradiation is completed, the detection source 4 is retrieved.

[0075] S7: After the detection source 4 is retrieved, open the shielding container 1, take out the thermoluminescent dosimeter 2, and stick adhesive labels on the detected points of the thermoluminescent dosimeter 2 and the shielding container 1 for annotation;

[0076] S8: Repeat steps S3 to S7 until all detection points are detected, and then use a thermoluminescent dosimeter to read the dose equivalent rate of the thermoluminescent dosimeter patch at all detection points.

[0077] S9: Calculate the total attenuation factor of the lead and steel layers at each test point of the shielding container 1 according to the design drawings and formulas, and calculate the reference dose equivalent rate per unit test time according to the formula for calculating the shielding dose equivalent. Then, compare the reference dose equivalent rate with the actual calculated dose equivalent rate to determine whether the shielding performance of each point is qualified.

[0078] In step S6, the detection duration is adjusted according to the energy and activity of the detection source.

[0079] Example 2

[0080] like Figures 5 to 8 As shown, the difference between this embodiment and Embodiment 1 is that the shielding container 1 adopts a B-type shielding container with a smaller internal space than the A-type shielding container. The shielding performance testing device for the shielding container provided in this embodiment includes a shielding container 1 (B-type shielding container), a thermoluminescent dosimeter 2, a detection source shielding sleeve 3, a detection source 4, a shielding sleeve bracket 5, an adjusting screw 6, and a worktable 7. The connection relationships of each structure are as described above and will not be repeated here.

[0081] It should be noted that during use, the detection point should be selected based on the actual location of the radiation source within the container.

[0082] like Figure 7 and Figure 8 As shown, by arranging detection points, both the six sides of the container body and the gaps in the moving parts of the container were detected.

[0083] Furthermore, based on the aforementioned shielding container shielding performance testing device, this application also provides a shielding container shielding performance testing method, comprising:

[0084] S1: Use lifting equipment to hoist the B shielding container 1 onto the workbench 7;

[0085] S2: After the B shielding container 1 is positioned on the workbench 7, corresponding marks are set on the inner and outer surface detection points of the B shielding container 1 according to the rules, and the corresponding marks are made into adhesive labels;

[0086] S3: After the marks of the detection points are all set, the internal detection points are installed with the fixed thermoluminescence dosimeter 2, and then the B shielding container 1 is restored to the working state.

[0087] S4: The shielding sleeve support 5 is installed outside the B shielding container 1, and the detection source shielding sleeve 3 is installed outside each detection point in sequence through the shielding sleeve support 5, and the position of the detection source shielding sleeve 3 is adjusted through the adjusting screw 6 so that the center thereof is aligned with the external mark of the A shielding container 1.

[0088] S5: The detection source 4 guide source pipe is installed in the corresponding detection source shielding sleeve 3, so that the center of the detection source 4 guide source pipe is positioned at the corresponding point outside the B shielding container 1 through the detection source shielding sleeve 3, and the alignment with the thermoluminescence dosimeter 2 is realized; the detection source 4 is output through the guide source pipe, and the field radiation dose level during the transportation of the detection source 4 is monitored to determine the field control area and the supervision area.

[0089] S6: After the detection source 4 is output, the timer is used for timing, the thermoluminescence dosimeter 2 at the corresponding point is irradiated for a specified time, and after the irradiation is completed, the detection source 4 is retrieved.

[0090] S7: After the detection source 4 is retrieved, the B shielding container 1 is opened, the thermoluminescence dosimeter 2 is taken out, and the adhesive label is stuck at the position of the thermoluminescence dosimeter 2 and the detected point of the B shielding container 1, and the remarks are made.

[0091] S8: The steps of steps S3 to S7 are repeated until the detection of all detection points is completed, and then the dose equivalent rate of the thermoluminescence dose patch at all detection points is read out by the thermoluminescence dose measuring device.

[0092] S9: According to the design drawing and formula, the total attenuation multiple of the shielding lead layer and the steel layer of each detection point of the B shielding container 1 is calculated, the reference dose equivalent rate in the unit detection time is calculated according to the shielding dose equivalent calculation formula, and the comparison between the reference dose equivalent rate and the actually calculated dose equivalent rate can determine whether the shielding performance of each point is qualified.

[0093] In step S6, the detection time is adjusted according to the energy and activity of the detection source.

[0094] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, which should be covered within the protection scope of the present application.

Claims

1. A device for testing the shielding performance of a shielded container, characterized in that, The device includes a shielding container (1), a thermoluminescent dosimeter (2), a detection source shielding sleeve (3), and a detection source (4). The detection source shielding sleeve (3) is located outside the shielding container (1), and the detection source (4) is located inside the detection source shielding sleeve (3). The shielding container (1) has several detection points, and the thermoluminescent dosimeter (2) is attached to the inner surface of each detection point. The detection points are arranged on the bottom and side walls of the shielding container (1). The detection points are marked, and the outer side of the shielding container (1) is marked. The center of the detection source shielding sleeve (3) is aligned with the mark. The detection source (4) has a source guide tube, one end of which is connected to the detection source shielding sleeve (3), and the other end is connected to the source device. The detection device also includes a workbench (7), the shielding container (1) is set on the workbench (7), an adjusting screw (6) is installed on the workbench (7), a shielding sleeve bracket (5) is provided on the adjusting screw (6), the shielding sleeve bracket (5) is connected to the detection source shielding sleeve (3) to adjust the position of the detection source shielding sleeve (3), and a plurality of screw mounting holes (8) are provided on the workbench (7), the adjusting screw (6) is installed in the screw mounting holes (8).

2. A method for testing the shielding performance of a shielded container, characterized in that, The method using the shielding performance testing device for shielded containers as described in claim 1 includes: S1: Arrange the shielding container (1) on the workbench (7); S2: Set corresponding markings at the detection points on the inner and outer surfaces of the shielding container (1), and make adhesive labels with corresponding markings and stick them at the detection points; S3: After all the markings at the detection locations are set, install and fix the thermoluminescent dosimeter (2) at the internal detection locations, and restore the shielding container (1) to its working state; S4: Install the shielding sleeve bracket (5) on the outside of the shielding container (1), and install the detection source shielding sleeve (3) on the outside of each detection position point in sequence through the shielding sleeve bracket (5). Adjust the position of the detection source shielding sleeve (3) by the adjusting screw (6) so that its center is aligned with the external mark of the shielding container (1); S5: Install the source tube of the detection source (4) inside the detection source shielding sleeve (3), so that the center of the source tube is positioned at the corresponding point on the outer surface of the shielding container through the detection source shielding sleeve (3), the source tube outputs the detection source (4), and monitors the on-site radiation dose level during the delivery of the detection source (4) to determine the on-site control area and supervision area; S6: After the detection source (4) outputs, start timing and irradiate the thermoluminescent dosimeter (2) at the corresponding point for a specified duration. After the irradiation is completed, retract the detection source (4). S7: Open the shielding container (1), take out the thermoluminescent dosimeter (2), and stick an adhesive label on the detected point; S8: Repeat steps S3-S7 until all detection points are detected, and then read the dose equivalent rate of all detection points. S9: Determine whether the shielding performance of each point is up to standard.

3. The method for testing the shielding performance of a shielding container according to claim 2, characterized in that, The dose equivalent rate of the thermoluminescent dosimeter (2) is read by the thermoluminescent dosimeter.

4. The method for testing the shielding performance of a shielding container according to claim 2, characterized in that, Calculate the total attenuation factor of the lead and steel layers at each detection point of the shielding container (1), calculate the reference dose equivalent rate per unit detection time according to the formula for calculating the shielding dose equivalent, and compare the reference dose equivalent rate with the actual calculated dose equivalent rate to determine whether the shielding performance of each point is qualified.

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