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GB 15208 consists of the following five parts under the general title Micro-dose X-ray security inspection system:
This part is developed in accordance with the rules given in GB/T 1.1-2009.
This part replaces GB 15208.1-2005 Micro-dose X-ray security inspection system - Part 1: General technical requirements; the following main technical changes are made with respect to GB 15208.1-2005 (the previous edition):
——8 terms are added, including effective atomic number, ambient dose equivalent rate, transmission X-ray security inspection system, backscatter X-ray security inspection system, controlled area, supervised area, unshielded micro-dose X-ray security inspection system and shielded micro-dose X-ray security inspection system (see 3.1, 3.8, 3.12, 3.13, 3.16, 3.17, 3.18 and 3.19);
——5 terms are modified (see 3.2, 3.3, 3.4, 3.14 and 3.15; 3.11, 3.12, 3.13, 3.22 and 3.23 of Edition 2005);
——3 definitions are modified, including dose per inspection, micro-dose X-ray security inspection system and safety interlock (see 3.7, 3.11 and 3.20; 3.17, 3.21 and 3.24 of Edition 2005);
——11 terms are deleted (see 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 3.10 and 3.16 of Edition 2005);
——System classification is added (see Clause 4);
——Requirements for performance index are deleted (see 4.1 of Edition 2005);
——Radiation and environmental security indexes are modified (see 5.2; 4.2 of Edition 2005);
——Operating environment conditions are modified (see 5.3.1; 4.3.1 of Edition 2005);
——Security requirements of system are modified [see 5.4.1e) and 5.4.1g); 4.4.1e) and 4.4.1g) of Edition 2005];
——Mechanical structure is modified (see 5.5; 4.5 of Edition 2005);
——Electromagnetic compatibility requirements are modified (see 5.6; 4.6 of Edition 2005);
——Electrical security is modified (see 5.7, 5.8, 5.9 and 5.10; 4.7 of Edition 2005);
——Environmental adaptability is modified (see 5.11; 4.8 of Edition 2005);
——Functional requirements are added (see 5.12);
——Main test instruments and tools are modified (see 6.2; 5.2 of Edition 2005);
——Test of radiation and environmental indexes is modified (see 6.3; 5.5 of Edition 2005);
——Test of application scope of power supply is modified (see 6.4; 5.7 of Edition 2005);
——Security performance test is modified (see 6.5; 5.6 of Edition 2005);
——Performance index test is deleted (see 5.4 of Edition 2005);
——Appearance inspection is modified (see 6.6.1; 5.3.1 of Edition 2005);
——Electromagnetic compatibility test is modified (see 6.7; 5.10 of Edition 2005);
——Electrical security test is modified (see 6.8, 6.9, 6.10 and 6.11; 5.9 of Edition 2005);
——Environmental adaptability test is modified (see 6.12; 5.8 of Edition 2005);
——Functional requirements testing is added (see 6.13);
——Evaluation of test images is deleted (see Clause 6 of Edition 2005);
——Inspection rules are added (see Clause 7);
——Packaging requirements are modified [see 8.1a); 8.1a) of Edition 2005];
——Marking requirements are modified (see 8.2; 8.2 of Edition 2005);
——Normative annexes are modified (see Annexes A and B; Annexes A and B of Edition 2005);
——Informative annex is deleted (see Annex C of Edition 2005);
This part was proposed by and is under the jurisdiction of the Ministry of Public Security of the People's Republic of China.
The previous editions of this part are as follows:
——GB 15208-1994;
——GB 15208.1-2005.
Micro-dose X-ray security inspection system - Part 1: General technical requirements
1 Scope
This part of GB 15208 specifies the classification, general technical requirements, test method, inspection rules, packaging, marking, storage, transportation and accompanied technical documents of micro-dose X-ray security inspection system.
This part is applicable to the design, manufacturing, acceptance and service of various micro-dose X-ray security inspection systems.
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/T 191-2008 Packaging - Pictorial marking for handling of goods
GB/T 2423.1-2008 Environmental testing - Part 2: Test methods - Tests A: Cold
GB/T 2423.2-2008 Environmental testing - Part 2: Test methods - Tests B: Dry heat
GB/T 2423.3-2016 Environmental testing - Part 2: Testing method - Test Cab: Damp heat, steady state
GB/T 2423.5-1995 Environmental testing for electric and electronic products Part 2: Test methods - Test Ea and guidance: Shock
GB/T 2423.10-2008 Environmental testing for electric and electronic products - Part 2: Tests methods - Test Fc: Vibration (sinusoidal)
GB/T 4208-2017 Degrees of protection provided by enclosure (IP code)
GB 4793.1-2007 Safety requirements for electrical equipment for measurement, control and laboratory use - Part 1: General requirements
GB/T 9254-2008 Information technology equipment - Radio disturbance characteristics - Limits and methods of measurement
GB/T 17626.2-2006 Electromagnetic compatibility (EMC) - Testing and measurement techniques - Electrostatic discharge immunity test
GB/T 17626.3-2016 Electromagnetic compatibility - Testing and measurement techniques - Radiated radio-frequency electromagnetic field immunity test
GB/T 17626.4-2008 Electromagnetic compatibility - Testing and measurement techniques - Electrical fast transient/burst immunity test
GB/T 17626.5-2008 Electromagnetic compatibility - Testing and measurement techniques - Surge immunity test
GB/T 17626.6-2008 Electromagnetic compatibility - Testing and measurement techniques - Immunity to conducted disturbances induced by radio-frequency fields
GB/T 17626.11-2008 Electromagnetic compatibility - Testing and measurement techniques - Voltage dips, short interruptions and voltage variations immunity tests
GB/T 17799.1-2017 Electromagnetic compatibility - Generic standards - Immunity for residential, commercial and light-industrial environments
GB/T 17799.3-2012 Electromagnetic compatibility (EMC) - Generic standards - Emission standard for industrial environments
GB/T 17799.4-2012 Electromagnetic compatibility (EMC) - Generic standards - Emission standard for industrial environments
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
effective atomic number
Zeff
atomic number of theoretical element representing a material property that has the same X-ray attenuation characteristics as this material
3.2
effective organic material
substance with effective atomic number less than 10
3.3
effective inorganic material
substance with effective atomic number greater than 18
3.4
effective mixed material
substance with effective atomic number between 10 and 18
3.5
impenetrable area
area where the intensity of X-ray in reaching detector by penetrating the object under inspection is almost zero and the system is incapable of differentiating the basic structural characteristics of the object under inspection
3.6
undetermined area
area where ray can penetrate but the material characteristics of the object under inspection cannot be recognized
3.7
dose per inspection
air kerma absorbed by the object for one inspection
Note: the unit of dose per inspection is Gy, 1Gy=1J/kg.
3.8
ambient dose equivalent rate
H*(10)
quotient of dH*(10) and dt, where dH*(10) is the increment of ambient dose equivalent within the time interval dt:
Note: the International System (IS) of ambient dose equivalent rate is sievert per second (Sv/s). The unit of ambient dose equivalent rate is the quotient of the sievert or its multiple or fraction and the appropriate time unit (e.g. mSv/h).
[Definition 3.3, GB/T 4835.1-2012]
3.9
scatter block
object scattering ray, thus leading to the worst radiation condition
3.10
X-ray security inspection system
system for identifying the security of object under inspection according to the X-ray image generated by measuring the intensity or spectral energy distribution of X-ray based on the interaction between X-ray and object under inspection or according to the provided information on material of object under inspection
3.11
micro-dose X-ray security inspection system
X-ray security inspection system with dose per inspection less than or equal to 10μGy
3.12
transmission micro-dose X-ray security inspection system
micro-dose X-ray security inspection system for identifying the security of object under inspection according to the X-ray image generated by measuring the intensity or spectral energy distribution of X-ray passing through the object under inspection or according to the provided information on material of object under inspection
3.13
backscatter micro-dose X-ray security inspection system
micro-dose X-ray security inspection system for generating the image of object under inspection by acquiring the backscattered X-ray of object under inspection based on the scattering effect of interaction between X-ray photons and substance
3.14
single-energy micro-dose X-ray security inspection system
micro-dose X-ray security inspection system used for giving image of the structural characteristics of the object under inspection by measuring the intensity distribution of X-ray based on the interaction between X-ray and object under inspection
3.15
multi-energy micro-dose X-ray security inspection system
micro-dose X-ray security inspection system used for recognizing and giving image of the material characteristics of object under inspection according to the rule that substances with different effective atomic numbers have different characteristics for the absorption of X-ray energy spectrum
3.16
controlled area
area in radiation working space, within which special protection means and security measures are required or possibly required for:
a) controlling normal irradiation or preventing pollution dispersion under normal working conditions;
b) preventing potential irradiation or limiting its intensity.
[Definition J5.5, GB 18871-2002]
3.17
supervised area
any area not determined as controlled area and, generally, not requiring special protection means and security measures but requiring a continuous inspection of occupational irradiation conditions
[Definition J5.6, GB 18871-2002]
3.18
unshielded micro-dose X-ray security inspection system
micro-dose X-ray security inspection system not equipped with radiation protection device for shielding the scattered and leaked rays generated during inspection, and requiring a delimitation of supervised area or being placed at the position meeting the radiation protection requirements
Foreword i 1 Scope 2 Normative references 3 Terms and definitions 4 System classification 5 General technical requirements 6 Test methods 7 Inspection rules 8 Packaging, marking, storage and transportation 9 Accompanied technical documents Annex A (Normative) Test method for dose per inspection Annex B (Normative) Test method for ambient dose equivalent rate Bibliography
5.12 功能要求 5.12.1 人机交互功能 满足以下要求： a) 键盘上各按键及指示灯应工作正常； b) 操作面板和屏幕文本信息应为图标或中文界面。 5.12.2 图像显示功能 满足以下要求： a) X射线图像应能完整显示被检对象及内部物体的整体轮廓； b) 具备输送装置控制功能的单视角、双视角透射式设备，被检对象停在通道内任意位置，再次启动输送装置应保证X射线图像完整。 5.12.3 图像处理功能 满足以下要求： a) 图像增强功能：增强显示图像局部细节。 b) 有机物和无机物剔除功能(多能谱型适用)： ——有机物剔除时，剔除图像中的等效有机物，显示剩余物质的颜色； ——无机物剔除时，剔除图像中的等效无机物，显示剩余物质的颜色。 c) 图像放大功能：放大显示所选中区域的物体图像。任意区域放大应不小于4倍。 d) 图像回拉功能：应能按图像生成顺序连续回调出不少于10幅的过检图像。 5.12.4 图像存储功能 满足以下要求： a) 图像存储功能：所有图像应自动存储； b) 图像存储容量：可存储不少于10000幅被检图像； c) 图像存储格式： ——应能通过生产厂家专用软件以离线方式再现图像，图像处理功能与设备功能相同； ——应能将图像的原始数据转换成通用的图像格式。 5.12.5 设备自诊断功能 设备应具备自诊断功能，并生成至少包括X射线产生装置、X射线探测器、控制器等主要功能部件运行状态的诊断报告。
