Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
All technical contents of this part are compulsory.
GB 15208 consists of the following five parts under the general title Micro-dose X-ray security inspection system:
——Part 1: General technical requirements;
——Part 2: Transmission baggage security inspection system;
——Part 3: Transmission cargo security inspection system;
——Part 4: Human body security inspection system;
——Part 5: Backscatter object security inspection system.
This is Part 2 of GB 15208.
This part is developed in accordance with the rules given in GB/T 1.1-2009.
This part replaces GB/T 15208.2-2006 Micro-dose X-ray security inspection system - Part 2: Test block. The following main technical changes have been made with respect to GB/T 15208.2-2006:
——The "Scope" is modified (see Clause 1);
——The “Normative references” is added (see Clause 2);
——12 terms and definitions are added (see Clause 3);
——The “General technical requirements” is added (see Clause 4);
——The "Test methods" is added (see Clause 5);
——The “Inspection rules” is added (see Clause 6);
——The “Packaging, marking, storage and transportation” is added (see Clause 7);
——The "Accompanied technical documents" is added (see Clause 8);
——The “Test blocks” is modified (see Annex A; Clause 4 of Edition 2006);
——The “Scatter block for ambient dose equivalent rate test” is added (see Annex B);
——The “Evaluation record form of test images” is added (see Annex C).
This part was proposed by and is under jurisdiction of the Ministry of Public Security of the People's Republic of China.
The previous edition of this part is as follows:
——GB/T 15208.2-2006.
Micro-dose X-ray security inspection system - Part 2: Transmission baggage security inspection system
1 Scope
This part of GB 15208 specifies the general technical requirements, test methods, inspection rules, packaging, marking, storage, transportation and accompanied technical documents of transmission baggage security inspection system.
This part is applicable to the design, manufacturing, assembling, acceptance and service of various transmission baggage security inspection systems.
Note: for the entrance of any inspection channel of this system, either the height or width of the entrance section is less than 1.1m.
This part is not applicable to X-ray security inspection system like computed tomography (CT), electron accelerator or X-ray generating device with energy greater than 500keV.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB 15208.1-2018 Micro-dose X-ray security inspection system - Part 1: General technical requirements
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 15208.1-2018 and the followings apply.
3.1
wire display
capability of the system in differentiating single solid-core copper wires
Note: generally, it is expressed by the nominal diameter (mm) of wire.
3.2
useful penetration resolution
capability of the system in differentiating single solid-core copper wires under the alloy aluminum step with the specified thickness
Note: generally, it is expressed by the nominal diameter (mm) of wire.
3.3
simple penetration
capability of the system in penetrating the object under inspection
Note: generally, it is expressed by the thickness (mm) of steel plate.
3.4
line pair
a set of metal wires arranged uniformly at an interval identical to the diameter of wire
Note: generally, the specification of line pair is expressed by the nominal diameter (mm) of wire.
3.5
spatial resolution
capability of the system in differentiating line pairs
Note: generally, it is expressed by the nominal diameter (mm) of wire.
3.6
gray level differentiation
capability of the system in differentiating objects under inspection with the same material but different thickness
Note: generally, it is expressed by the number of alloy aluminum steps that can be differentiated.
3.7
organic differentiation
capability of the system in differentiating effective organic materials
Note: generally, it is expressed by the thickness of organic step that can be differentiated.
3.8
inorganic differentiation
capability of the system in differentiating effective inorganic materials
Note: generally, it is expressed by the thickness of steel step that can be differentiated.
3.9
mixed differentiation
capability of the system in differentiating effective mixed materials
Note: generally, it is expressed by the thickness of alloy aluminum step that can be differentiated.
3.10
material differentiation
capability of the system in differentiating materials with different effective atomic numbers
3.11
useful material differentiation
capability of the system in differentiating materials with different effective atomic numbers under steel step with the specified thickness
3.12
transmission baggage security inspection system
transmission micro-dose X-ray security inspection system used for baggage inspection, of which, either the height or width of the entrance section of any inspection channel is less than 1.1m
4 General technical requirements
4.1 Performance indexes
4.1.1 General
For a transmission baggage security inspection system (hereinafter referred to as system) with multiple transmission views, the performance index of any view shall meet the requirements of 4.1, and the worst value of each test result of each view is taken as the performance index of the system; for a system with multiple inspection channels, the performance index of any inspection channel shall meet the requirements of 4.1, and the worst value of each test result of each inspection channel is taken as the performance index of the system. When the tests specified in 4.1.2~4.1.11 are performed, the parameters of X-ray generating device such as tube voltage, tube current and total filtration shall be unchanged.
4.1.2 Wire display
It shall be able to differentiate the requirements for minimum diameter of single solid-core copper wire, as detailed in Table 1.
Table 1 Wire display index requirements
In mm
Level Level I Level II
Wire display 0.203 0.102
4.1.3 Useful penetration resolution
It shall be able to differentiate the requirements for minimum diameter of single solid-core copper wire under the alloy aluminum steps with a thickness of 9.5mm, 15.9mm or 22.2mm, as detailed in Table 2.
Table 2 Useful penetration resolution index requirements
In mm
Level Level I Level II
Useful penetration resolution 0.511 0.254
4.1.4 Spatial resolution
It shall be able to differentiate the requirements for minimum diameter of line pair, as detailed in Table 3.
Table 3 Spatial resolution index requirements
In mm
Level Level I Level II
Spatial resolution 1.6 1.0
4.1.5 Simple penetration
It shall be able to differentiate the requirements for minimum thickness of steel plate, as detailed in Table 4.
Table 4 Simple penetration index requirements
In mm
Level Level I Level II Level Ⅲ
Simple penetration 15 27 38
4.1.6 Organic differentiation (applicable to multi-energy system)
It shall be able to differentiate organic steps with thickness range of 1mm~120mm and give orange color at different saturation levels.
4.1.7 Gray level differentiation
It shall be able to differentiate alloy aluminum steps with thickness range of 1mm~60mm and thickness difference of not less than 1mm.
4.1.8 Mixed differentiation (applicable to multi-energy system)
It shall be able to differentiate alloy aluminum steps with thickness range of 1mm~60mm and give green color at different saturation levels.
4.1.9 Inorganic differentiation (applicable to multi-energy system)
It shall be able to differentiate steel steps with thickness range of 0.2mm~14mm and give blue color at different saturation levels.
4.1.10 Material differentiation (applicable to multi-energy system)
It shall be able to differentiate three kinds of material samples with different effective atomic numbers and give green color to PVC plate while orange color to simulant plate and nylon 6 plate.
4.1.11 Useful material differentiation (applicable to multi-energy system)
It shall be able to differentiate three kinds of material samples with different effective atomic numbers, which are located behind 1.5mm-thick, 2.0mm-thick and 2.5mm-thick steel plates, giving green color and blue color respectively; it shall also be able to differentiate 6 areas in the nine areas of test object 10 in test block B, as defined in Annex A.
4.1.12 Conveying device
The following requirements shall be met:
a) the conveying speed under inspection shall be greater than or equal to 0.19m/s;
b) the conveying belt shall run in the forward and reverse directions without deviation:
——the lateral displacement is less than or equal to 5mm within 10min continuous forward operation;
——the lateral displacement is less than or equal to 10mm within 30s continuous reverse operation.
4.2 Radiation and environmental security indexes
4.2.1 Dose per inspection
It shall meet the requirements of 5.2.1, GB 15208.1-2018.
4.2.2 Ambient dose equivalent rate
It shall meet the requirements of 5.2.2, GB 15208.1-2018.
4.2.3 System noise
It shall meet the requirements of 5.2.3, GB 15208.1-2018.
4.3 Operating environment
4.3.1 Operating environment conditions
They shall meet the requirements of 5.3.1, GB 15208.1-2018.
4.3.2 Adaptability of power supply
It shall meet the requirements of 5.3.2, GB 15208.1-2018.
4.4 Security performance
It shall meet the requirements of 5.4, GB 15208.1-2018.
4.5 Mechanical structure
It shall meet the requirements of 5.5, GB 15208.1-2018.
4.6 Electromagnetic compatibility
It shall meet the requirements of 5.5, GB 15208.1-2018.
4.7 Electric shock prevention
It shall meet the requirements of 5.7, GB 15208.1-2018.
4.8 Mechanical hazard prevention
It shall meet the requirements of 5.8, GB 15208.1-2018.
4.9 Flame spread prevention
It shall meet the requirements of 5.9, GB 15208.1-2018.
4.10 Temperature limit and heat resistance
They shall meet the requirements of 5.10, GB 15208.1-2018.
4.11 Environmental adaptability
It shall meet the requirements of 5.11, GB 15208.1-2018.
4.12 Functional requirements
They shall meet the requirements of 5.12, GB 15208.1-2018.
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 General technical requirements
5 Test methods
6 Inspection rules
7 Packaging, marking, storage and transportation
8 Accompanied technical documents
Annex A (Normative) Test blocks
Annex B (Normative) Scatter block for ambient dose equivalent rate test
Annex C (informative) Evaluation record forms of test images
