GB 15208.5-2018Micro-dose X-ray security inspection systems - Part 5: Backscatter object security inspection systems (English PDF)

Foreword

All technical content in this section is mandatory. GB 15208 "Micro Dose X-ray Safety Inspection Equipment" is divided into the following five parts.

--- Part 1. General technical requirements;

--- Part 2. Transmissive bag security inspection equipment;

--- Part 3. Transmissive cargo safety inspection equipment;

--- Part 4. Human body safety inspection equipment;

--- Part 5. Backscattering items safety inspection equipment. This part is the fifth part of GB 15208. This part is drafted in accordance with the rules given in GB/T 1.1-2009. This part is proposed and managed by the Ministry of Public Security of the People's Republic of China. This section drafted by: Ministry of Public Security First Institute, Beijing Zhongduan Anmin Analysis Technology Co., Ltd., Tongfang Weishi Technology Co., Ltd. Division, National Security and Alarm System Product Quality Supervision and Inspection Center (Beijing), National Security and Alarm System Product Quality Supervision and Inspection Heart (Shanghai). The main drafters of this section. Xing Yu, Chen Li, Meng Zhiqiang, Wang Fenghua, Yu Wei, Lu Peng, Liu Caixia, Jin Yingkang, Yan Yaping. Micro-dose X-ray safety inspection equipment Part 5. Backscattering article safety inspection equipment

1 Scope

Part 5 of China's mandatory series on micro-dose X-ray security inspection equipment, covering the backscatter systems - the machines that read the radiation scattered back from an object rather than what passes through it. The distinction is the whole point of this part. A transmission machine needs the source on one side and the detector on the other, so it can only look at something that fits inside its tunnel; a backscatter machine puts the source and the detector on the same side, which lets it look at a vehicle, a container, a wall or a large object that could never pass through a scanner, and which makes it strongly sensitive to the low atomic number materials - organics, explosives, drugs - that a transmission image of a dense load tends to hide. It specifies the classification, the general technical requirements, the test methods, the inspection rules, the packaging and marking, the storage and transport and the accompanying technical documentation of backscatter object security inspection systems, applied together with the general requirements of Part 1. The requirements cover the imaging performance in the terms that suit the technique - the detection of organic material of defined thickness at defined depth, the spatial resolution, the contrast and the uniformity of the image across the scanned area - and then the radiation safety, which on a machine whose beam is not confined inside a tunnel is a harder problem than on a transmission system: the leakage and scatter around the equipment, the controlled area, the interlocks and warnings, and the limits that apply where the operator is close to the beam path. The electrical, environmental and electromagnetic requirements and the image handling complete the part. Issued on 19 November 2018 and in force since 1 December 2019.

This part of GB 15208 specifies the classification, general technical requirements, test methods, inspection rules, and safety inspection equipment for backscattered articles. Packaging, marking, storage and transportation, and random technical documentation. This section applies to various micro-dose X-ray safety inspections that use X-ray backscatter imaging technology to carry out safety inspections on articles. Design, manufacture, assembly, acceptance and use. This section does not apply to portable backscatter safety inspection equipment.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article. Pieces. For undated references, the latest edition (including all amendments) applies to this document.

GB 15208.1-2018 Micro-dose X-ray safety inspection equipment - Part 1. General technical requirements

3 Terms and definitions

The following terms and definitions defined in GB 15208.1-2018 apply to this document.

3.1 Backscatter X-ray backscatterX-ray Scattered X-rays greater than 90° with respect to incident X-rays.

3.2 Micro-dose X-ray backscatter article security inspection equipment micro-doseX-raybackscaterobjectsecurityinspectionsystem A backscattered microdose X-ray safety inspection device for inspecting articles.

3.3 Mobile backscatter X-ray safety inspection equipment mobilebackscatterX-raysecurityinspectionsystem Mobile X-ray generating device and detector for backscattering X-ray imaging of backscattered articles device.

3.4 Fixed backscatter X-ray safety inspection equipment fixedbackscatterX-raysecurityinspectionsystem The X-ray generating device does not move, and the back-scattered article micro-dose of the object to be examined is realized by back-scattering X-ray imaging through the inspection area X-ray safety inspection equipment.

3.5 Open backscatter X-ray security inspection equipment unshieldedbackscatterX-raysecurityinspectionsystem Radiation protection devices for shielding, leaking rays, etc. generated during the inspection process are not installed, and it is necessary to delineate the supervision area or place it in compliance. Radiation protection requires a backscattered item of micro-dose X-ray safety inspection equipment.

3.6 Closed backscatter X-ray safety inspection equipment shieldedbackscatterX-raysecurityinspectionsystem Micro-dose X-rays of backscattered articles with radiation protection devices for shielding scattering, leaking rays, etc. generated during inspection Safety inspection equipment.

3.7 Backscattering penetration backscattersimplepenetration The ability of the device to resolve organic matter behind a certain thickness of the steel plate.

Note. It is expressed by the thickness (mm) of the steel plate.

3.8 Backscatter spatial resolution backscatterspatialresolution The ability of the device to distinguish pairs of polyethylene wires in an air background.

Note. Indicated by the line width (mm) of the pair.

3.9 Backscatter line resolution backscatterwiredisplay The device distinguishes the ability of a single polyethylene rod in an air background.

Note. Indicated by the diameter of the rod (mm).

3.10 Backscatter line detection force backscatterwiredetection The device's ability to resolve a single solid copper wire in the context of a strong scatterer.

4 Equipment classification

4.1 Micro-dose X-ray backscattering article safety inspection equipment (hereinafter referred to as equipment) is classified according to the type of inspection object.

a) line-package equipment;

b) Container and vehicle equipment.

4.2 The equipment is divided according to the type of equipment structure.

a) mobile equipment;

b) Fixed equipment.

4.3 Equipment is classified according to the type of protection.

a) open equipment;

b) Closed equipment.

5 General technical requirements

5.1 Overview A device with multiple scattering viewing angles, the performance index of any viewing angle should meet the requirements of 5.2; with multiple scattering inspection channels Equipment, the performance indicators of any of its channels should meet the requirements of 5.2. Overall performance of a device with multiple scattering viewing angles or multiple scattering channels The test results of the viewing angle or channel marked with the worst performance index shall prevail. Xray generators should be maintained when performing tests 5.2.1~

5.2.5 The tube voltage, tube current and other parameters are unchanged. When applied to vehicle-borne equipment, this chapter only targets the key components related to X-ray emission, acquisition and imaging. Performance is required.

6 Test methods

6.1 Environmental requirements Should comply with the provisions of

6.1 of GB 15208.1-2018.

6.2 Main instruments and tools for testing Should comply with the provisions of

6.2 of GB 15208.1-2018. Test body. See Appendix A. Scatter. See Appendix B.

7 Inspection rules

7.1 Inspection classification Should comply with the provisions of

7.1 of GB 15208.1-2018.

7.2 Type inspection Should comply with the provisions of

7.2 of GB 15208.1-2018.

7.3 Factory inspection Should comply with the provisions of

7.3 of GB 15208.1-2018.

7.4 Inspection items The inspection items are shown in Table 2. Table

2 Inspection items Serial number inspection project technical requirements test method type inspection factory inspection

19 Environmental Adaptability 5.12 6.13 - -

20 Functional requirements 5.13 6.14 - -a a Only 5.12.1a),

5.12.5 in GB 15208.1-2018 are required.

7.5 Evaluation of test images during type inspection Should comply with the provisions of

7.5 of GB 15208.1-2018.

7.6 Inspection Should comply with the provisions of

7.6 of GB 15208.1-2018.

7.7 Decision rules Should comply with the provisions of

7.7 of GB 15208.1-2018.

8 Packaging, marking, storage and transportation Should comply with the provisions of Chapter 8 of GB 15208.1-2018.

9 random technical documents

Should comply with the provisions of Chapter 9 of GB 15208.1-2018.

Appendix A

(normative appendix) Test body A.1 Backscattering penetration test body The backscatter penetrating test body consists of an arrow-shaped polyethylene test card, a test card-mounted steel plate (including a bracket), and a set of additional tests of different thicknesses. Steel plate and connector. A 100 mm thick polyethylene test card is centered on the test plate to hold the steel plate. Test card fixed steel plate thickness The degree is 2.0mm. The shape of the backscattering penetration test body is shown in Figure A.1~Fig. A.3; the overall dimensions are shown in Figure A.4. See the dimensions of the fixed steel plate and the bracket. Figure A.5; arrow-shaped polyethylene test card dimensions are shown in Figure A.6; test body additional steel plate dimensions are shown in Figure A.7; additional test steel plate thickness specifications see Table A.1. Figure A.1 Backscattering penetration test body shape perspective view Figure A.2 Backscattering penetration test body profile main view Description. 1

---2mm thick test card fixed steel plate and bracket, the material is 45 carbon steel plate; 2

---polyethylene arrow-shaped test card, made of 100mm thick polyethylene plate, density of 0.95g/cm3 ± 0.05g/cm3; 3

---polyethylene test card fixing screw; 4

---Additional test steel plate fixing bolts and nuts; 5

---Additional test steel plates, all of which are 45 carbon steel plates. Figure A.3 Backscattering penetration test body top view The unit is mm Figure A.4 Overall Dimensional Drawing of Backscattering Penetration Test Body The unit is mm Figure A.5 Backscattering penetration test body fixed steel plate and bracket size chart The unit is mm Figure A.6 Backscattering penetration test body arrow-shaped polyethylene test card size chart The unit is mm Figure A.7 Backscattering penetration test body additional steel plate size drawing Table A.1 Additional test steel plate thickness specifications in millimeters Additional test steel plate thickness twenty one 0.5 1 A.2 Backscattering spatial resolution test body The backscattering spatial resolution test body consists of 11 pairs of test cards and fixing brackets made of different specifications and polyethylene plates. Backscatter The spatial resolution test body shape is shown in Figure A.8~Figure A.10; the overall dimensions are shown in Figure A.11; the fixed bracket dimensions are shown in Figure A.12; Dimensions are shown in Figure A.13; wire pair test card size specifications are shown in Table A.2. Figure A.8 Backscattering spatial resolution test body outline stereogram Description. 1~11

---pair test card, made of polyethylene plate, density is 0.95g/cm3±0.05g/cm3; 12

--- Test card fixing bracket, the material is aluminum. Figure A.9 Backscattering spatial resolution test body profile main view Figure A.10 Backscattering spatial resolution test body profile top view The unit is mm Figure A.11 Backscattering spatial resolution test body overall size The unit is mm Figure A.12 Backscattering spatial resolution test body fixing bracket overall size drawing The unit is mm Figure A.13 Backscattering spatial resolution test body test card size chart Table A.2 Wire pair test card size specifications in millimeters Line pair test card number line width t Table A.2 (continued) Units are in millimeters Line pair test card number line width t A.3 Backscattering line resolution test body The backscatter line resolution test body consists of 16 sets of polyethylene rods of different diameters and a frame. See the backscatter line resolution test body shape Figure A.14~Figure A.16; overall dimensions are shown in Figure A.17; fixed bracket dimensions are shown in Figure A.18; polyethylene test rod dimensions are shown in Figure A.19; The bar size specifications are shown in Table A.3. Figure A.14 Backscattered line resolution test body shape perspective view Description. 1~16

---polyethylene test rod, density is 0.95g/cm3±0.05g/cm3; 17

--- polyethylene test rod fixed frame and bracket, the material is aluminum. Figure A.15 Backscattered line resolution test body profile main view Figure A.16 Backscattered line resolution test body profile top view The unit is mm Figure A.17 Backscattered line resolution test body size The unit is mm Figure A.18 Backscattered line resolution test body bracket overall size drawing The unit is mm Figure A.19 Backscattered line resolution test body polyethylene test rod size chart Table A.3 Polyethylene rod size specifications in millimeters Polyethylene rod number indicates diameter