GB 15208.1-2018Micro-dose X-ray security inspection systems - Part 1: General technical requirements (English PDF)

5.2 Radiation and environmental safety indicators

5.2.1 Single dose check A single inspection dose of a device with only one X-ray generating device should be less than or equal to 5 µGy, and there are multiple X-ray generating devices. A single check dose should be less than or equal to 10µGy, a device with multiple inspection channels, and a single dose of any one of the channels Should meet the above requirements.

5.2.2 Peripheral dose equivalent rate When the equipment is working normally, the enclosed equipment is at a distance of 0.1m from any accessible surface of the equipment (including the inlet and outlet of the equipment). The volume equivalent rate should be less than or equal to 1µSv/h; open equipment needs to be delineated or placed in compliance with radiation protection requirements, outside the supervision area The surrounding dose equivalent rate should be less than or equal to 2.5 µSv/h; the surrounding dose equivalent rate of the worker position should be less than or equal to 0.5 µSv/h.

5.2.3 Equipment noise The equipment noise should be less than or equal to 65dB (A) at any point 1m away from the outer surface of the equipment during normal operation.

5.3 Operating environment

5.3.1 Working environment conditions Ambient temperature range. 5 ° C ~ 40 ° C. Relative humidity range. 5%~85%. Atmospheric pressure range. 70kPa~106kPa.

5.3.2 Power Adaptability The power supply voltage shall be within 10%-15% of the nominal voltage and the nominal frequency ±3Hz, and the equipment shall be able to operate normally.

5.4 Security performance

5.4.1 Equipment Safety Requirements are as follows:

a) The equipment should have obvious system operation and ray emission display devices (indicators);

b) The equipment should be equipped with an emergency stop switch at a location accessible to the operator. If an emergency occurs, the equipment X can be cut off immediately. The power supply of the radiation generating device and the conveying device; the emergency stop switch should use a red switch with a yellow bottom;

c) The equipment shall be equipped with a power overcurrent protection device of appropriate rating to prevent overuse of internal components or other accidents. Current may cause a fire hazard;

d) The equipment shall be provided with a key switch and a secondary power start switch, and the key switch shall be able to clearly identify the "on" and "off" positions;

e) A safety protection interlock shall be fitted on the detachable radiation protection component of the X-ray emission area. Once the interlock is disconnected, The power supply of the X-ray generating device of the device can be cut off immediately, and the X-ray should stop emitting immediately;

f) The equipment should have an operator identification function;

g) The equipment shall display the gray scale of the material uncertainty area and give obvious hints to the impervious area.

5.4.2 X-ray generating device safety Requirements are as follows:

a) The X-ray generator shall be self-cooled within the equipment;

b) X-ray generators using external circulation cooling systems should have temperature or pressure control when the temperature of the coolant (oil or water) exceeds When the specified value is exceeded or the circulating pressure is lower than the specified value, the X-ray emission can be automatically stopped;

c) The X-ray generating device shall have an overvoltage and overcurrent protection function, which can automatically be used when its voltage or current exceeds the specified value of the product. Cutting off the high pressure;

d) The X-ray generating device shall have a protective grounding wire. The color of the grounding wire shall be yellow-green, and the grounding resistance shall not exceed 0.1 Omega.

5.5 Mechanical structure

5.5.1 Appearance section Requirements are as follows:

a) The design and operation procedures of the equipment shall be in accordance with the basic requirements of ergonomics and shall be easy to operate and maintain;

b) The appearance of the equipment should be intact, the surface should be smooth and smooth, the color should be uniform, no obvious mechanical damage, no blistering damage to the coating, metal The parts shall be free from rust and the plastic parts shall be free from blistering and cracking;

c) Mark and write on the panel clearly.

5.5.2 Mechanical part Requirements are as follows:

a) The equipment consists of parts and all parts, and should have sufficient strength and rigidity. All adjustment and control mechanisms should be installed correctly and operated. flexible;

b) The installation and disassembly of the outer cover should be convenient;

c) The frame shall have sufficient strength and rigidity to be free from deformation or damage during normal handling;

d) The equipment casters should have sufficient strength and rotational flexibility, and the connection with the equipment should be firm and reliable;

e) The degree of protection of the enclosure shall comply with the provisions of GB/T 4208-2017 and not less than the requirements of IP20.

5.6 Electromagnetic compatibility

5.6.1 Equipment Immunity Electrostatic discharge, radio frequency electromagnetic field radiation, electrical fast transient bursts, surge (shock), and RF field induced conduction disturbances And 6 voltage immunity tests for voltage sag, short interruption and voltage change. The immunity performance of equipment working in industrial environment should be consistent. The requirements for the limits specified in Tables 1, 2 and 4 of GB/T 17799.2-2003. Equipment for working in residential, commercial and light industrial environments The immunity performance shall comply with the requirements specified in Tables 1, 2 and 4 of GB/T 17799.1-2017.

5.6.2 Equipment launch The radiated and conducted emission values of equipment operating in an industrial environment shall comply with the limits specified in Table 1 of GB/T 17799.4-2012. The radiated and conducted emission values of equipment operating in residential, commercial and light industrial environments shall be in accordance with Table 1 of GB/T 17799.3-2012 The requirements for the specified limits.

5.7 Anti-shock The equipment shall be protected against electric shock under normal conditions and single fault conditions, and the accessible parts of the equipment shall not be dangerously charged. Meet the requirements of Chapter 6 of GB 4793.1-2007.

5.8 Anti-mechanical danger Operation under normal conditions or under single fault conditions shall not cause mechanical hazards and comply with the requirements of Chapter 7 of GB 4793.1-2007.

5.9 Preventing the spread of flame Under normal conditions or under single fault conditions, the flame shall not spread to the outside of the equipment, in accordance with Chapter 9 of GB 4793.1-2007. Claim.

5.10 Temperature limits and heat resistance The temperature limit and heat resistance of the equipment shall comply with the requirements of Chapter 10 of GB 4793.1-2007.

5.11 Environmental adaptability

5.11.1 Overview The environmental adaptability of equipment and electrical components with independent functions meets the following requirements.

a) The equipment is a large-scale electromechanical product. When it is not suitable for environmental testing of the whole machine, it is allowed to press the electrical parts with independent functions separately.

5.11.5 shall be tested; the technical indicators of the whole machine or electrical component test shall meet the requirements of the equipment or components;

b) Electrical components with independent functions, after testing in

5.11.2 and 5.11.5, connect to the whole machine to test the whole machine, the equipment should be able to normal work;

c) After climatic and mechanical environmental tests, equipment should not show signs of corrosion and mechanical damage.

5.11.2 Climate and environmental adaptability See Table 1 for requirements. Table

1 Climate environment adaptability Test item severity grade test method Machine duration Check item Independent electrical components duration Check item Low temperature 0 °C ± 3 ° C Test Ab by GB/T 2423.1-2008 Conduct, test the power of the project High temperature 45 °C ± 2 ° C Test Bb according to GB/T 2423.2-2008 Carry out, the whole process is energized Constant damp heat 40 ° C ± 2 ° C Relative humidity. 93 2-3% (no condensation) Test Cab according to GB/T 2423.3-2016 Conduct, test the power of the project Before the start of the test Initial test And each test Inspection before the end Check items and parties Device by device Quasi-regulation Before the start of the test Initial test and each Before the end of the trial Check items and Method by product Quasi-regulation Low temperature storage -40 °C ± 3 ° C Test Ab by GB/T 2423.1-2008 Carry out, no power during the test After the test is over Less recovery after 4h Inspection, check item Project and method Standard requirements After the test is over Less recovery after 4h Test, test items and Method by product Quasi-regulation

5.11.3 Resistance to mechanical shock and impact The mechanical shock resistance and impact of the equipment shall comply with the requirements of Chapter 8 of G...