GB 15208.2-2018Micro-dose X-ray security inspection systems - Part 2: Transmission baggage security inspection systems (English PDF)

3.1 Line resolution

The ability of the device to resolve a single solid copper wire.

Note: Generally indicated by the nominal diameter (mm) of the wire.

3.2 Penetration resolution

The device distinguishes the ability of a single solid copper wire under the specified thickness of the alloy aluminum step.

Note: Generally indicated by the nominal diameter (mm) of the wire.

3.3 Penetration force

The ability of the device to penetrate the object being examined.

Note: Generally, it is expressed by the thickness (mm) of the steel plate.

3.4 Wire pair

A group of metal wires arranged evenly, the spacing between the two wires being the same as the diameter of the wires.

Note: The nominal diameter (mm) of the general line indicates the specification of the pair.

3.5 Spatial resolution

The ability of the device to resolve pairs.

Note: Generally indicated by the nominal diameter (mm) of the wire.

3.6 Grayscale resolution

The ability of the device to distinguish the same material and different thickness of the object to be inspected.

Note: Generally, it is expressed by the number of steps of the separable alloy aluminum step.

3.7 Organic matter distinguishing

The ability of the device to resolve equivalent organic matter.

Note: Generally expressed in terms of the thickness of the step of distinguishable organic matter.

3.8 Inorganic distinguishing

The ability of the device to resolve equivalent inorganics.

Note: Generally expressed in terms of the thickness of the resolvable steel step.

3.9 Mixture resolution

The ability of the device to resolve equivalent mixtures.

Note: Generally expressed in terms of the thickness of the separable alloy aluminum step.

3.10 Material discrimination

The device resolves the ability to have different equivalent atomic number materials.

3.11 Effective material distinguishing

The device resolves the ability to have different equivalent atomic number materials under the specified thickness steel step.

3.12 Transmissive bag security inspection equipment

Transmissive micro-agent for checking baggage and parcels, and any one of the inspection channel inlet sections with a height and width less than 1.1 m X-ray safety inspection equipment.

4.1 Performance indicators

4.1.1 Overview

Transmissive bag-type security inspection equipment (hereinafter referred to as equipment) with multiple transmission angles, the performance index of any one of the viewing angles should be Meet the requirements of 4.1, and use the worst value of each test result from each perspective as the performance index of the equipment; the design with multiple inspection channels The performance index of any one of the inspection channels should meet the requirements of 4.1, and the worst value of each test result of each inspection channel is used. This performance indicator of the device.

When performing the test of 4.1.2~4.1.11, the tube voltage, tube current, total filtration, etc. of the X-ray generator shall be maintained. The parameters are unchanged.

4.1.2 Line resolution

Should be able to distinguish the minimum single solid copper wire diameter requirements, see Table 1.

4.1.3 Penetration resolution

Should be able to resolve the requirements of the minimum single solid copper wire diameter under the 9.5mm, 15.9mm and 22.2mm alloy aluminum steps, see Table 2.

4.1.4 Spatial resolution

Should be able to distinguish the minimum line diameter requirements, see Table 3.

4.1.5 Penetration

Should be able to distinguish the requirements of the thickness of the thinnest steel plate, see Table 4.

4.1.6 Organic matter resolution (for multi-energy spectrum equipment)

It should be able to distinguish organic ladders with thicknesses ranging from 1mm to 120mm and impart orange with different saturations.

4.1.7 Grayscale resolution

It should be able to distinguish the aluminum step of the alloy with a thickness ranging from 1mm to 60mm and a thickness difference of not less than 1mm.

4.1.8 Mixture resolution (for multi-energy spectrum equipment)

It should be able to distinguish the aluminum step of the alloy with a thickness ranging from 1mm to 60mm and give green with different saturation.

4.1.9 Inorganic resolution (for multi-energy spectrum equipment)

It should be able to distinguish steel steps with thicknesses ranging from 0.2mm to 14mm and impart blue with different saturations.

4.1.10 Material resolution (for multi-energy spectrum equipment)

It should be able to distinguish three material samples with different equivalent atomic numbers and give the PVC board green, giving the analog board and nylon 6 board Orange.

4.1.11 Effective material resolution (for multi-energy spectrum equipment)

It should be able to distinguish three kinds of materials with different equivalent atomic numbers behind the three thickness steel plates of 1.5mm, 2.0mm and 2.5mm, and give green and blue respectively; should be able to distinguish 6 of the 9 areas of test card 10 in test body B in Appendix A.

4.1.12 Conveying device

Meet the following requirements.

a) The conveying speed under inspection should be greater than or equal to 0.19m/s;

b) The conveyor belt should run in the forward and reverse directions.

--- Within 10 minutes of continuous continuous operation, the lateral displacement is less than or equal to 5mm;

--- In the reverse continuous operation for 30s, the lateral displacement is less than or equal to 10mm.

4.2 Radiation and environmental safety indicators

4.2.1 Single dose check

Should comply with the provisions of 5.2.1 of GB 15208.1-2018.

4.2.2 Peripheral dose equivalent rate

Should comply with the provisions of 5.2.2 of GB 15208.1-2018.

4.2.3 Equipment noise

Should comply with the provisions of 5.2.3 of GB 15208.1-2018.

4.3 Operating environment

4.3.1 Working environment conditions

Should comply with the provisions of 5.3.1 of GB 15208.1-2018.

4.3.2 Power Adaptability

Should comply with the provisions of 5.3.2 of GB 15208.1-2018.

4.4 Security performance

Should comply with the provisions of 5.4 of GB 15208.1-2018.

4.5 Mechanical structure

Should comply with the provisions of 5.5 of GB 15208.1-2018.

4.6 Electromagnetic compatibility

Should comply with the provisions of 5.6 of GB 15208.1-2018.

4.7 Anti-shock

Should comply with the provisions of 5.7 of GB 15208.1-2018.

4.8 Anti-mechanical danger

Should comply with the provisions of 5.8 of GB 15208.1-2018.

4.9 Preventing the spread of flame

Should comply with the provisions of 5.9 of GB 15208.1-2018.

4.10 Temperature limit and heat resistance

Should comply with the provisions of 5.10 of GB 15208.1-2018.

4.11 Environmental adaptability

Should comply with the provisions of 5.11 of GB 15208.1-2018.

4.12 Functional requirements

Should comply with the provisions of 5.12 of GB 15208.1-2018.

5.1 Environmental requirements

Should comply with the provisions of 6.1 of GB 15208.1-2018.

5.2 Main instruments and tools for testing

Should comply with the provisions of 6.2 of GB 15208.1-2018. Test body A and test body B: see Appendix A. Scatter: see Appendix B.

5.3 Performance Indicator Test

5.3.1 Overview

The placement and orientation of the test body depends on the relative position of the X-ray generating device and the detector. The test body plane should be vertical in the direction of ray emission, and placed as close as possible to the X-ray generating device to obtain the best test body image. In addition, image processing is allowed the function achieves the best evaluation results. The test results should be recorded in the format of Appendix C.

5.3.2 Line resolution test

Place the test body A in the inspection area, start and complete the scan, and visually measure the X-ray pattern of the test card 1 in the test body A on the display.

For example, the device is tested for the ability of a single solid copper wire in the background of the test body, and the result is in accordance with the requirements of 4.1.2.

Note: If you can see most of the wires that are not obstructed by the aluminum step of the alloy, you can think that the device can distinguish the wire.

5.3.3 Penetration resolution test

Place the test body A in the inspection area, start and complete the scan, and visually measure the X-ray pattern of the test card 2 in the test body A on the display.

For example, the equipment is tested for the ability to separate a single solid copper wire under the alloy aluminum step, and the result is in accordance with the requirements of 4.1.3.

Note: If you can see most of the metal wire blocked by the aluminum alloy step, you can think that the device can distinguish the metal wire.

5.3.4 Spatial resolution test

Place the test body A in the inspection area, start and complete the scan, and visually measure the X-ray image of the test card 3 in the test body A on the display.

The device is tested for the ability to resolve the wire pair and determine whether the result meets the requirements of 4.1.4.

Note: If all four metal lines of the horizontal and vertical pairs are completely separated, the device can be considered to be able to resolve the pair.

5.3.5 Penetration test

Experiment with the following.

a) Place the test body A in the inspection area, start and complete the scan, and visually inspect the X-ray of the test card 4 in the test body A on the display.

Image, the ability to penetrate the steel plate of the equipment, the maximum digital value of the steel step corresponding to the three-quarter round lead That is, the thickness of the steel plate can be penetrated by the equipment, and the judgment result meets the requirements of 4.1.5;

Note: If the majority of the three-quarters of the lead blocks blocked by the steel plate can be seen and the direction of the notch can be distinguished, the device can be considered to penetrate the steel step.

b) Observe the warning information of the multi-energy spectrum equipment on the impervious area, and determine whether the result complies with GB 15208.1-2018 5.4.1g) requirements.

5.3.6 Organic matter discrimination test

Place the test body B in the inspection area, start and complete the scan, and visually test the X of the test card 5 and the test card 6 in the test body B on the display.

The radiographic image determines whether the result meets the requirements of 4.1.6.

Note: If the adjacent steps of the organic ladder sample can be distinguished and can give orange to different saturations, the device can be considered to be distinguishable.

5.3.7 Grayscale/mixture resolution test

The test body B is placed in the inspection area, the scan is started and completed, and the X-ray image of the test card 7 in the test body B on the display is visually observed.

Observe the number of steps of the resolved aluminum step and the color of the step, and determine whether the results meet the requirements of 4.1.7 and 4.1.8.

Note: For single-energy spectrum equipment, if the adjacent steps of the alloy aluminum step sample can be distinguished and can be given different gray levels, the device can be considered to be distinguishable;

For multi-energy spectroscopy equipment, equipment can be considered if the adjacent steps of the alloy aluminum step sample can be distinguished and can be given different saturation green Can distinguish.

5.3.8 Inorganic resolution test

The test body B is placed in the inspection area, the scan is started and completed, and the X-ray image of the test card 8 in the test body B on the display is visually observed. Determine whether the result meets the requirements of 4.1.9.

Note: If the adjacent steps of the steel step sample can be distinguished and can be given a different shade of blue, the device can be considered to be distinguishable.

5.3.9 Material Resolution Test

The test body B is placed in the inspection area, the scan is started and completed, and the X-ray image of the test card 9 in the test body B on the display is visually observed. Determine whether the result meets the requirements of 4.1.10.

Note: If the sample images are rendered in the same grayscale, different colors, the device can be considered to be able to resolve these samples.

5.3.10 Effective material resolution test

The test body B is placed in the inspection area, the scan is started and completed, and the X-ray pattern of the test card 10 in the test body B on the display is visually observed.

For example, observe the number of distinguishable regions and determine whether the results meet the requirements of 4.1.11.

Note: If the sample area that is obscured by the steel step can be distinguished from the change in color, the device is considered to be able to distinguish this area.

5.3.11 Conveyor test

Follow the steps below to experiment.

a) Under the minimum conveying speed of the conveying device in the inspection state, run at no load, test the unit time travel of the conveying device, calculate Conveying speed, whether the judgment result meets the requirements of 4.1.12a);

b) Continuously run forward for 10 minutes under the maximum conveying speed of the conveying device in the inspection state, and judge whether the result is consistent Requirements of 4.1.12b);

c) Continuously reverse the operation for 30 s at the maximum conveying speed of the conveying device in the inspection state, and determine whether the result complies with 4.1.12b) Requirements.

5.4 Radiation and environmental safety indicators test

5.4.1 Single dose test

Place the center of the radiation sensitive component of the dosimeter in the horizontal center of the surface of the conveyor in the inspection channel, as per The test method specified in 6.3.1 of GB 15208.1-2018 tests the equipment and determines whether the result meets the requirements of 4.2.1.

5.4.2 Peripheral Equivalent Rate Test

When the conveying device is stationary, the scatterer with the same number of ray bundles (see Appendix B) is placed in the inspection channel.

The horizontal center of the surface, each scatterer is illuminated by a beam of radiation, and the 300×300 plane of the scatterer is parallel to the ray Beam direction. Test the equipment according to the test method specified in 6.3.2 of GB 15208.1-2018, and determine whether the results are consistent with 4.2.2 requirements.

5.4.3 Equipment noise test

Test the equipment according to the test method specified in 6.3.3 of GB 15208.1-2018, and determine whether the result meets the requirements of 4.2.3.

5.5 Power supply range test

Test the equipment according to the test method specified in 6.4 of GB 15208.1-2018, and determine whether the result meets the requirements of 4.3.2.

5.6 Safety performance test

Test the equipment according to the test method specified in 6.5 of GB 15208.1-2018, and determine whether the result meets the requirements of 4.4.

5.7 Mechanical structure test

Test the equipment according to the test method specified in 6.6 of GB 15208.1-2018, and determine whether the result meets the requirements of 4.5.

5.8 Electromagnetic Compatibility Test

Test the equipment according to the test method specified in 6.7 of GB 15208.1-2018, and determine whether the result meets the requirements of 4.6.

5.9 Anti-shock test

Test the equipment according to the test method specified in 6.8 of GB 15208.1-2018, and judge whether the result meets the requirements of 4.7.

5.10 Anti-mechanical danger test

Test the equipment according to the test method specified in 6.9 of GB 15208.1-2018, and determine whether the result meets the requirements of 4.8.

5.11 Prevention of flame spread test

The equipment shall be tested in accordance with the test method specified in 6.10 of GB 15208.1-2018, and the result is judged to meet the requirements of 4.9.

5.12 Temperature Limit and Heat Resistance Test

Test the equipment according to the test method specified in 6.11 of GB 15208.1-2018, and determine whether the result meets the requirements of 4.10.

5.13 Environmental Adaptability Test

Test the equipment according to the test method specified in 6.12 of GB 15208.1-2018, and determine whether the result meets 4.11.

5.14 Functional Requirements Test

Follow the manufacturer's product instructions to determine if the results meet the requirements of 4.12.

6.1 Inspection classification

Should comply with the provisions of 7.1 of GB 15208.1-2018.

6.2 Type inspection

Should comply with the provisions of 7.2 of GB 15208.1-2018.

6.3 Factory inspection

Should comply with the provisions of 7.3 of GB 15208.1-2018.

6.4 Inspection items

The inspection items are shown in Table 5.

6.5 Evaluation of test images during type inspection

Should comply with the provisions of 7.5 of GB 15208.1-2018.

6.6 Inspection

Should comply with the provisions of 7.6 of GB 15208.1-2018.

6.7 Judgment rules

Should comply with the provisions of 7.7 of GB 15208.1-2018.

A.1 Overview

The test body includes the test body A and the test body B. Test body A is an image resolution test body for testing the line resolution of the device, wearing Transparency, spatial resolution and penetrating power; test body B is a material-resolved test body for organic resolution, gray-scale resolution of test equipment, Mixture resolution, inorganic resolution, material resolution and effective material resolution.

The test body contains a test card. The test card is mounted on the fixing plate of the test body and is packaged into a rectangular shape by the upper and lower protective linings.

The protective lining of the test body is made of a primary color foamed polyethylene plate with a density of 0.015 g/cm³ to 0.025 g/cm³.

A.2 Test body A (image resolution test body)

A.2.1 Overview

Test body A includes four test cards: line resolution test card (TEST1), penetration resolution test card (TEST2), spatial resolution test Test card (TEST3) and penetration test card (TEST4). […]