Shielding container shielding performance detection device and method

Abstract

The invention 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, and the detection source is arranged inside the detection source shielding sleeve; the shielding container is provided with a plurality of detection points, the inner surface of each detection point is pasted with a thermoluminescence dosimeter, and the method utilizes the device to carry out shielding performance detection. According to the invention, a plurality of detection point positions are arranged in the shielding container, the thermoluminescence dosimeters are arranged in the detection point positions, the detection source is used for gamma ray output at the outer side, and the reference value is obtained through the shielding dose equivalent calculation formula, so that the shielding performance of the point positions can be detected.

Description

Technical Field

[0001] The present application belongs to the technical field of high-energy ray shielding detection, and in particular, relates to a device and method for detecting the shielding performance of a shielding container. Background Art

[0002] In modern industrial production, food production, medical testing and treatment, and the nuclear industry, radioactive sources are often needed. The use and transportation of radioactive sources require shielding containers. In order to ensure the safety of radioactive sources during use and transportation, shielding containers generally need to be tested for shielding performance after manufacturing to verify that their shielding performance meets the design requirements.

[0003] The existing shielding performance detection technology of shielding containers generally measures or calculates the dose rate of the detection source with appropriate energy and activity first, then positions the source pipe of the detection source inside the shielding container, and after the detection source is output from the source pipe, a detection instrument is placed on the outer surface of the shielding container corresponding to the detection source, and the dose rate on the outer surface of the shielding container is read by 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] First, for shielding containers with narrow internal space or small inlet and outlet sizes, the source pipe of the detection source cannot enter the shielding container, and the shielding performance test cannot be carried out.

[0006] Second, for shielding containers with shielding covers or shielding doors, the detection source cannot be set at the junction of the shielding cover or shielding door and the shielding container body, and it is impossible to simulate actual use conditions to perform shielding performance testing. Summary of the invention

[0007] The purpose of the present application is to overcome the defects of the prior art, thereby providing a shielding performance detection device and method for shielding containers, which are used for shielding detection of shielding containers with narrow inner cavities and small diameter inlet and outlet channels.

[0008] In order to achieve the above objectives, this application provides the following technical solutions:

[0009] In the first aspect, the present application provides a shielding container shielding performance detection device, including a shielding container, a thermoluminescent dosimeter, a detection source shielding cover, and a detection source, wherein the detection source shielding cover is arranged on the outside of the shielding container, and the detection source is arranged inside the detection source shielding cover. The shielding container is provided with a plurality of detection points, and the thermoluminescent dosimeter is adhered to the inner surface of each detection point.

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

[0011] In some embodiments, an adjusting screw is installed on the workbench, a shielding sleeve bracket is provided on the adjusting screw, and the shielding sleeve bracket is connected to the detection source shielding sleeve to adjust 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 installed in the screw mounting holes.

[0013] In some embodiments, the detection points are arranged on the bottom and side walls of the shielding container, and the detection points are marked.

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

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

[0016] In a second aspect, the present application provides a method for detecting shielding performance of a shielding container, comprising:

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

[0018] S2: Setting corresponding marks at the detection points on the inner and outer surfaces of the shielding container, and making adhesive labels with corresponding marks, and sticking them at the detection points;

[0019] S3: After all the identifications of the detection positions are set, a fixed thermoluminescent dosimeter is installed at the internal detection point, and the shielding container is restored to a working state;

[0020] S4: installing a shielding sleeve bracket on the outside of the shielding container, sequentially installing a detection source shielding sleeve on the outside of each detection position point through the shielding sleeve bracket, and adjusting the position of the detection source shielding sleeve by adjusting the screw so that the center thereof is aligned with the external mark of the shielding container;

[0021] S5: installing the source guide tube of the detection source in the detection source shielding sleeve, so that the center of the source guide tube is positioned at a corresponding point on the outer surface of the shielding container through the detection source shielding sleeve, the source guide tube outputs the detection source, and monitors the on-site radiation dose level during the transmission of the detection source to determine the on-site control area and supervision area;

[0022] S6: After the detection source is output, timing is performed, and the thermoluminescent dosimeter at the corresponding point is irradiated for a specified time. After the irradiation is completed, the detection source is retracted;

[0023] S7: Open the shielding container, take out the thermoluminescent dosimeter, and stick a backing label at the position of the detected point;

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

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

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

[0027] In some embodiments, the total attenuation multiples of the shielding lead layer and the steel layer at each detection point of the shielding container are calculated, and the reference dose equivalent rate within the unit detection time is calculated according to the shielding dose equivalent calculation formula. The reference dose equivalent rate is compared with the actually measured dose equivalent rate to determine whether the shielding performance of each point is qualified.

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

[0029] The present application sets up multiple detection points inside the shielding container, sets up thermoluminescent dosimeters inside the detection points, uses a detection source on the outside to output gamma rays, and then obtains a reference value through a shielding dose equivalent calculation formula. The shielding performance of the point can be tested. This application is suitable for shielding containers with narrow internal spaces or small inlet and outlet sizes, and avoids the situation where shielding containers with shielding covers or shielding doors cannot simulate actual usage conditions for shielding performance testing, thereby improving practicality.

[0030] The present application measures the dose equivalent rates of multiple detection points by sequentially setting up thermoluminescent dosimeters and radiation sources. Compared with the method of placing a large number of thermoluminescent dosimeters at the same time, this can effectively prevent the superposition effect that may be caused by radiation sources at other locations during irradiation, and effectively reduce the probability of false detection and missed detection by labeling, thereby improving the detection accuracy.

[0031] When setting the detection source shielding sleeve, the present application effectively improves the accuracy and safety of the positioning of the detection source shielding sleeve by adding passive simulation operations, and reduces the error rate of subsequent actual detection operations.

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

[0033] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for the technical description.

[0034] Figure 1A front view of a shielding performance testing device for a shielding container provided in Example 1 of the present application, wherein a section view shows a partial structure;

[0035] Figure 2 A top view of a shielding performance testing device for a shielding container provided in Example 1 of the present application;

[0036] Figure 3 Schematic diagram of the arrangement of the detection points provided in Example 1 of the present application Figure 1 ;

[0037] Figure 4 Schematic diagram of the arrangement of the detection points provided in Example 1 of the present application Figure 2 , its perspective and Figure 3 different;

[0038] Figure 5 A front view of a device for testing shielding performance of a shielding container provided in Example 2 of the present application, wherein a cross-section view shows a partial structure;

[0039] Figure 6 A top view of a shielding performance testing device for a shielding container provided in Example 2 of the present application;

[0040] Figure 7 Schematic diagram of the arrangement of detection points provided in Example 2 of the present application Figure 1 ;

[0041] Figure 8 Schematic diagram of the arrangement of detection points provided in Example 2 of the present application Figure 2 , its perspective and Figure 7 different;

[0042] Fig. 9 A flow chart of a method for detecting shielding performance of a shielding container provided in this application.

[0043] Description of reference numerals:

[0044] 1. Shielding container; 2. Thermoluminescent dosimeter; 3. Detection source shielding cover; 4. Detection source; 5. Shielding cover bracket; 6. Adjustment screw; 7. Workbench; 8. Screw mounting hole. DETAILED DESCRIPTION

[0045] The following is further explained in detail through specific implementation methods.

[0046] like Figures 1 to 8 As shown, the present application provides a shielding performance detection device for a shielding container, comprising a shielding container 1, 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 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 bracket 5 is arranged on the adjusting screw 6.

[0047] The inner cavity of the shielding container 1 is narrow or the radiation source cannot enter or exit the inner cavity of the container after the container is closed. The shielding container 1 has a "Z"-shaped through hole or gap. The inner and outer surfaces of the shielding container 1 are provided with several detection points, such as Figure 3 and Figure 4 As shown, the detection points include A01, A02, A03, A04, A05, A06, A07, and A08. Figure 7 and Figure 8 As shown, the detection points include B01, B02, B03, B04, B05, B06, B07, and B08.

[0048] Among them, the detection points are selected from the main body of the container, through holes and gaps on each side, which not only detects the shielding ability of the container body, but also detects the shielding ability of the weak points of the container, and comprehensively evaluates the shielding effect of the container. The inner surface of the container detection point is pasted with a thermoluminescent dosimeter 2, and the outer surface is irradiated with a detection source, and the actual shielding thickness is calculated by counting with the thermoluminescent dosimeter 2.

[0049] Specifically, a detection point is provided at the bottom, and a number of detection points are also provided on the side wall. Corresponding marks are set at the positions of the detection points, and marks can be set on the inner and outer surfaces of the shielding container 1. Detection source shielding sleeves 3 are respectively set outside the detection points (the outer surface of the shielding container 1), and the detection source shielding sleeves 3 are installed and fixed by shielding sleeve brackets 5. The shielding sleeve brackets 5 are connected to the adjusting screws 6 and the shielding sleeve brackets 5 are adjusted by the adjusting screws 6, thereby adjusting the position of the detection source shielding sleeve 3, so that the center of the detection source shielding sleeve 3 is aligned with the outer mark of the shielding container 1.

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

[0051] The shielding sleeve bracket 5 can be arranged in multiple locations, such as Figure 1 or Figure 5 As shown, in actual use, only one shielding sleeve bracket 5 may be used.

[0052] Furthermore, the workbench 7 is provided with screw mounting holes 8 in multiple directions, and the detection source shielding sleeve 3 can be installed in multiple orientations. Specifically, the shielding sleeve bracket 5 is installed on the screw mounting hole 8, and the detection source shielding sleeve 3 is installed on the shielding sleeve bracket 5. By adjusting the installation position of the shielding sleeve bracket 5, the installation position of the detection source shielding sleeve 3 is further adjusted.

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

[0054] Optionally, the thermoluminescent dosage patch 2 adopts an existing thermoluminescent dosage patch.

[0055] In addition, if Fig. 9 As shown, the present application also provides a method for detecting shielding performance of a shielding container, comprising:

[0056] S1: hoisting the shielding container 1 onto the workbench 7 by means of a lifting device;

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

[0058] S3: After all the identifications of the detection positions are set, the thermoluminescent dosimeter 2 is installed and fixed at the internal detection points, and then the shielding container 1 is restored to the working state;

[0059] 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 through the shielding sleeve bracket 5 in turn, and adjust the position of the detection source shielding sleeve 3 by adjusting the screw 6 so that its center is aligned with the external mark of the shielding container 1;

[0060] S5: Install the detection source 4 guide tube in the corresponding detection source shielding sleeve 3, so that the center of the detection source 4 guide tube is positioned at the corresponding point on the outer surface of the shielding container through the detection source shielding sleeve 3, and is aligned with the thermoluminescent dosimeter 2; the source guide tube outputs the detection source 4, and monitors the on-site radiation dose level during the transmission of the detection source 4, and determines the on-site control area and supervision area;

[0061] S6: After the detection source 4 outputs, the timer is used to time the thermoluminescent dosimeter 2 at the corresponding point according to the 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 retracted, the shielding container 1 is opened, the thermoluminescent dosimeter 2 is taken out, and adhesive labels are attached to the positions of the detection points of the thermoluminescent dosimeter 2 and the shielding container 1 to make notes;

[0063] S8: repeating steps S3 to S7 until all detection points are detected, and then using the thermoluminescent dose measurement device to read out the dose equivalent rates of the thermoluminescent dose meters 2 at all detection points;

[0064] S9: Calculate the total attenuation multiples of the shielding lead layer and steel layer at each detection point of the shielding container 1 according to the design drawings and formulas, and calculate the reference dose equivalent rate within the unit detection time according to the shielding dose equivalent calculation formula. Then, compare the reference dose equivalent rate with the actually 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 of this embodiment is an A shielding container with a shielding door, and the shielding performance detection device of the shielding container provided in this embodiment includes a shielding container 1 (A 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 workbench 7. The connection relationship of each structure is as described above and will not be repeated here.

[0067] It should be noted that during use, the detection point is selected according to the position of the radiation source in the container under actual working conditions.

[0068] In addition, based on the above-mentioned shielding container shielding performance detection device, the present application also provides a shielding container shielding performance detection method, including:

[0069] S1: hoisting the shielding container 1 (A shielding container) onto the workbench 7 by means of a lifting device;

[0070] S2: After the shielding container 1 is positioned on the workbench 7, corresponding marks are set at the detection positions on the inner and outer surfaces of the shielding container 1 according to the rules, and adhesive labels with corresponding marks are made;

[0071] S3: After all the identifications of the detection positions are set, the thermoluminescent dosimeter 2 is installed and fixed at the internal detection points, and then the shielding container 1 is restored to the 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 position point through the shielding sleeve bracket 5 in turn, and adjust the position of the detection source shielding sleeve 3 by adjusting the screw 6 so that its center is aligned with the external mark of the shielding container 1;

[0073] S5: Install the detection source 4 guide tube in the corresponding detection source shielding sleeve 3, so that the center of the detection source 4 guide tube 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 align with the thermoluminescent dosimeter 2; the source guide tube outputs the detection source 4, and monitors the on-site radiation dose level during the transmission of the detection source 4, and determines the on-site control area and the supervision area;

[0074] S6: After the detection source 4 outputs, the timer is used to time the thermoluminescent dosimeter 2 at the corresponding point according to the specified time. After the irradiation is completed, the detection source 4 is retracted;

[0075] S7: After the detection source 4 is retracted, the shielding container 1 is opened, the thermoluminescent dosimeter 2 is taken out, and adhesive labels are attached to the positions of the detection points of the thermoluminescent dosimeter 2 and the shielding container 1 to make notes;

[0076] S8: repeating steps S3 to S7 until all detection points are detected, and then using a thermoluminescent dose measuring device to read out the dose equivalent rates of the thermoluminescent dose patches at all detection points;

[0077] S9: Calculate the total attenuation multiples of the shielding lead layer and steel layer at each inspection point of the shielding container 1 according to the design drawings and formulas, and calculate the reference dose equivalent rate within the unit inspection time according to the shielding dose equivalent calculation formula. Then, compare the reference dose equivalent rate with the actually calculated dose equivalent rate to determine whether the shielding performance of each point is qualified.

[0078] The detection duration in step S6 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 shielding container with a narrow internal space, and the internal space of the B shielding container is smaller than that of the A shielding container. The shielding performance detection device of the shielding container provided in this embodiment includes a shielding container 1 (B 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 workbench 7. The connection relationship of each structure is as described above and will not be repeated here.

[0081] It should be noted that during use, the detection point is selected according to the position of the radiation source in the container under actual working conditions.

[0082] like Figure 7 and Figure 8 As shown, by arranging the detection points, both the six surfaces of the container body and the gaps of the movable parts of the container are detected.

[0083] In addition, based on the above-mentioned shielding container shielding performance detection device, the present application also provides a shielding container shielding performance detection method, including:

[0084] S1: hoisting the B shielding container 1 onto the workbench 7 by means of a lifting device;

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

[0086] S3: After all the identifications of the detection positions are set, the thermoluminescent dosimeter 2 is installed and fixed at the internal detection points, and then the B shielding container 1 is restored to the working state;

[0087] S4: Install a shielding sleeve bracket 5 on the outside of the B shielding container 1, and sequentially install a detection source shielding sleeve 3 on the outside of each detection position point through the shielding sleeve bracket 5, and adjust the position of the detection source shielding sleeve 3 by adjusting the screw 6 so that its center is aligned with the external mark of the A shielding container 1;

[0088] S5: Install the detection source 4 guide tube in the corresponding detection source shielding sleeve 3, so that the center of the detection source 4 guide tube is positioned at the corresponding point on the outer surface of the B shielding container 1 through the detection source shielding sleeve 3, so as to align with the thermoluminescent dosimeter 2; the source guide tube outputs the detection source 4, and monitors the on-site radiation dose level during the transportation of the detection source 4, and determines the on-site control area and the supervision area;

[0089] S6: After the detection source 4 outputs, the timer is used to time the thermoluminescent dosimeter 2 at the corresponding point according to the specified time. After the irradiation is completed, the detection source 4 is retracted;

[0090] S7: After the detection source 4 is retracted, the B shielding container 1 is opened, the thermoluminescent dosimeter 2 is taken out, and adhesive labels are attached to the positions of the detected points of the thermoluminescent dosimeter 2 and the B shielding container 1 to make notes;

[0091] S8: repeating steps S3 to S7 until all detection points are detected, and then using a thermoluminescent dose measuring device to read out the dose equivalent rates of the thermoluminescent dose patches at all detection points;

[0092] S9: Calculate the total attenuation multiples of the shielding lead layer and steel layer at each inspection point of shielding container B 1 according to the design drawings and formulas, and calculate the reference dose equivalent rate per unit inspection time according to the shielding dose equivalent calculation formula. Then, compare the reference dose equivalent rate with the actually calculated dose equivalent rate to determine whether the shielding performance of each point is qualified.

[0093] The detection duration in step S6 is adjusted according to the energy and activity of the detection source.

[0094] The above description is only a specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed in the present application should be covered within the protection scope of the present application.

Claims

1. A shielding performance detection device for a shielding container, characterized in that: The invention comprises 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 arranged outside the shielding container (1), the detection source (4) is arranged inside the detection source shielding sleeve (3), the shielding container (1) is provided with a plurality of detection points, and the thermoluminescent dosimeter (2) is adhered to the inner surface of each detection point.

2. The shielding performance detection device of the shielding container according to claim 1 is characterized in that: The detection device also includes a workbench (7), and the shielding container (1) is arranged on the workbench (7).

3. The shielding performance detection device of the shielding container according to claim 2 is characterized in that: An adjusting screw (6) is installed on the workbench (7), a shielding sleeve bracket (5) is provided on the adjusting screw (6), and 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).

4. The shielding performance detection device of the shielding container according to claim 3 is characterized in that: The workbench (7) is provided with a plurality of screw mounting holes (8), and the adjusting screw (6) is mounted in the screw mounting holes (8).

5. The shielding performance detection device of the shielding container according to claim 1, characterized in that: The bottom and side walls of the shielding container (1) are both provided with the detection points, and the detection points are provided with markings.

6. The shielding performance detection device of a shielding container according to claim 1, characterized in that: The outside of the shielding container (1) is provided with a mark, and the center of the detection source shielding sleeve (3) is aligned with the mark.

7. The shielding performance detection device of a shielding container according to claim 1, characterized in that: 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 of which is connected to a source machine.

8. A method for detecting shielding performance of a shielding container, characterized in that: include: S1: placing the shielding container (1) on a workbench (7); S2: setting corresponding marks at the detection points on the inner and outer surfaces of the shielding container (1), and making adhesive labels with corresponding marks, and sticking them at the detection points; S3: After all the identifications of the detection positions are set, a fixed thermoluminescent dosimeter (2) is installed at the internal detection point, and the shielding container (1) is restored to a working state; S4: installing a shielding sleeve bracket (5) on the outside of the shielding container (1), sequentially installing a detection source shielding sleeve (3) on the outside of each detection position point through the shielding sleeve bracket (5), and adjusting the position of the detection source shielding sleeve (3) by adjusting the screw (6) so that the center thereof is aligned with the external mark of the shielding container (1); S5: installing the source guide tube of the detection source (4) in the detection source shielding sleeve (3), so that the center of the source guide tube is positioned at a corresponding point on the outer surface of the shielding container through the detection source shielding sleeve (3), the source guide tube outputs the detection source (4), and monitors the on-site radiation dose level during the transportation of the detection source (4), and determines the on-site control area and the supervision area; S6: After the detection source (4) outputs, timing is performed, and the thermoluminescent dosimeter (2) at the corresponding point is irradiated for a specified time. After the irradiation is completed, the detection source (4) is retracted; S7: opening the shielding container (1), taking out the thermoluminescent dosimeter (2), and sticking an adhesive label on the position of the detected point; S8: repeating steps S3-S7 until all detection points are detected, and then reading out the dose equivalent rates of all detection points; S9: Determine whether the shielding performance of each point is qualified.

9. The method for detecting shielding performance of a shielding container according to claim 8, characterized in that: The dose equivalent rate of the thermoluminescent dose meter (2) is read out by a thermoluminescent dose measuring device.

10. The method for detecting shielding performance of a shielding container according to claim 8, characterized in that: The total attenuation multiples of the shielding lead layer and the steel layer at each detection point of the shielding container (1) are calculated, and the reference dose equivalent rate within the unit detection time is calculated according to the shielding dose equivalent calculation formula. The reference dose equivalent rate is compared with the actually calculated dose equivalent rate to determine whether the shielding performance of each point is qualified.

Images