HJ 785-2016 English PDFUS$329.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email. HJ 785-2016: Technical standard of radiation safety for electron linear accelerator industrial computed tomography Status: Valid
Basic dataStandard ID: HJ 785-2016 (HJ785-2016)Description (Translated English): Technical standard of radiation safety for electron linear accelerator industrial computed tomography Sector / Industry: Environmental Protection Industry Standard Word Count Estimation: 14,125 Date of Issue: 2016-03-29 Date of Implementation: 2016-04-01 Regulation (derived from): Announcement No.24 of the Ministry of Environmental Protection Issuing agency(ies): Ministry of Ecology and Environment HJ 785-2016: Technical standard of radiation safety for electron linear accelerator industrial computed tomography---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order. Technical standard of radiation safety for electron linear accelerator industrial computed tomography National Environmental Protection Standard of the People 's Republic of China Electronic Linear Accelerator Industry CT Radiation Safety Technology Specification Technical standard of radiation safety for electron linear accelerator Industrial computed tomography 2016-03-29 released 2016-04-01 implementation Ministry of Environmental Protection Directory Preface II 1 Scope of application2 normative reference documents3 Terms and Definitions4 General requirements5 accelerator industry CT radiation safety and protection performance requirements6 Accelerator Industrial CT Workplace Radiation Safety and Protection Requirements7 Accelerator Industrial CT Safety Operating Requirements8 Radiation protection monitoring and safety inspection9 quality assurance .6 Appendix A (normative) Accelerator Industrial CT Workplace, Peripheral Environment Radiation Level Monitoring Requirements and Methods 8 Appendix B (informative) Accelerator Industrial CT Safety Interlock Logical Relations 9 Appendix C (informative) Accelerator Industrial CT Workshop and Radiation Safety Facility Layout Example .10 Appendix D (Normative Appendix) Accelerator Industry CT Radiation Protection Category, Content and Period of Monitoring and Inspection 11ForewordIn order to implement the Environmental Protection Law of the People's Republic of China and the Law of the People's Republic of China on the Prevention and Control of Radioactive Pollution, Protect the protection of workers and the public radiation and safety, the development of this standard. This standard specifies the sales (including construction) of the electronic linear accelerator industrial CT and the radiation safety and management requirements in use. Annex A to this standard, Appendix D is a normative appendix, Appendix B, Appendix D is an informative appendix. This standard is proposed by the Department of Environmental Protection Radiation Safety Administration. This standard is organized by the Ministry of Environmental Protection Nuclear Safety Management Division, Science and Technology Standards Division. The main drafting unit of this standard. Chongqing University, Chongqing City, radiation environmental supervision and management station, China Atomic Energy Research Institute. This standard is approved by the Ministry of Environmental Protection on March 29,.2016. This standard has been implemented since April 1,.2016. This standard is explained by the Ministry of Environmental Protection. Electronic linear accelerator - Industrial CT radiation safety technical specification1 Scope of applicationThis standard specifies the sales (including construction) of the electronic linear accelerator industrial CT and the radiation safety and management requirements in use. This standard is applicable to industrial CT devices with energy not higher than 15MeV electron linear accelerator.2 normative reference documentsThe contents of this standard refer to the terms of the following documents. For undated references, the valid version applies to this standard. GB 3095 Ambient Air Quality Standard Basic standards for the safety of ionizing radiation protection and radiation sources GB 18871-2002 GB/T 9445 Non - destructive testing personnel qualification and certification Electronic linear accelerators for non - destructive testing GB/T 29070 Non - destructive testing - General requirements for industrial computer tomography (CT) testing3 terms and definitionsThe following terms and definitions apply to this standard 3.1 electronic linear accelerator A device for accelerating the use of a pulsed radio frequency generator for electrons generated by an electron gun in a linear accelerating tube to obtain a high-energy electron beam. Called accelerator. Accelerator produces high-energy electrons can be directly derived for industrial irradiation or medical treatment, but also bombardment to heavy metals Target, resulting in X-ray as an industrial non-destructive testing or medical treatment of X-ray source. The electronic linear accelerator in this standard is only used X-ray source. 3.2 industrial CT industrial computed tomography Industrial CT is an industrial computer tomography (CT) detection technology, is a digital radiation imaging nondestructive testing technology. Rays After passing through a specific area of the object to be detected along the plurality of viewing angles, the radiation transmittance is recorded by the radiation detector, The algorithm reconstructs the distribution of physical features in the region. Industrial CT generally by the radiation source system, detection systems, data acquisition and transmission systems, Mechanical systems, control systems, image processing systems and radiation protection security systems and other components. 3.3 linear linear accelerator industry The use of electronic linear accelerator as a radiation source of the industrial CT device, referred to as accelerator industry CT. 3.4 accelerator industry CT radiation source system radiation source system of accelerator industrial CT An apparatus for providing an X-ray beam required for accelerator industrial CT scanning. Mainly by the accelerator head, modulator cabinet, control cabinet (Taiwan), Cooling unit, beam limiting device, radiation protection and related support mechanism and other components, referred to as accelerator system. 3.5 accelerator industrial CT control system control system of accelerator industrial CT To achieve accurate control of industrial CT scanning motion, to coordinate the acceleration of the accelerator beam and the data acquisition system sampling signal accurate synchronization Of the timing logic control, and is responsible for the system of radiation safety protection. Generally by the servo control system, computer, console (cabinet) And other hardware equipment and related control software components, referred to as industrial CT control system. 3.6 accelerator industrial CT test room test room of accelerator industrial CT For the installation of accelerator industrial CT scanning device and has a radiation safety protection function of the special scan detection workshop, referred to as the detection room. 3.7 maximum air-kerma rate of accelerator When the accelerator is in normal operating state at maximum power, the air detonation energy at the center of the ray cone is about 1 m away from the target The maximum value. 3.8 accelerator leakage dose ratio In the accelerator useful beam, at any distance of 100 cm from the accelerator target, the leak of the accelerator head The ratio of the gas kerma rate to the air kerma at the target axis of 1m on the center axis of the useful beam.4 General requirements4.1 General principles 4.1.1 Basic requirements Accelerator Industrial CT sales (including construction) and the use of units should be based on national laws and regulations to establish a sound radiation Safety management system and the annual assessment of radiation safety and protection status management system. 4.1.2 Radiation protection depth defense principle According to the principle of defense in depth, set the accelerator industrial CT multiple radiation protection and safety measures, and its radiation protection and safety The system, components and equipment have the appropriate redundancy, diversity and independence. 4.2 Radiation workplace partition and warning signs and equipment working status identification 4.2.1 Radiation of workplaces In accordance with the provisions of GB 18871-2002, accelerator industrial CT radiation workplace is divided into. A) Control area. detection area within the protective door area; B) supervision area. control room, equipment room, inspection parts loading and unloading area and other auxiliary room and other areas. 4.2.2 Warning signs and equipment working status identification In the detection room workpiece and personnel entrance, should set the ionizing radiation warning signs, and accelerator working status indicator device. ionization Radiation warning signs and Chinese warning instructions, etc., shall comply with GB 18871-2002 Appendix F in Figure F.1 and Figure F.2 requirements. 4.3 Dose control of occupational exposure and public exposure 4.3.1 Personal Dose Control 4.3.1.1 Accelerator Industrial CT sales (including construction), in use, occupational exposure and public exposure dose limits should be met GB 18871-2002 requirements. 4.3.1.2 Dose limits for occupational exposure and public exposure are defined as. A) Radiation staff personal annual dose constraint value of 5mSv; B) The individual member's annual annual dose constraint is 0.1 mSv. 4.3.2 Workplace dose control Appendix A contains the workplace and the surrounding environment of the shield (wall) surface is greater than or equal to 30cm at any monitoring point of the week The equivalent dose rate should not be greater than 2.5μSv/h.5 accelerator industry CT radiation safety and protection performance requirements5.1 General requirements 5.1.1 Accelerator maximum air ratio kinetic energy, electron beam energy, X-ray uniformity and other performance indicators and electrical and mechanical safety technology Requirements and test methods should meet the corresponding requirements of GB/T.20129. 5.1.2 Accelerator The design and manufacture of industrial CT shall meet the general requirements for GB/T 29070 industrial CT inspection, Radiation protection and safety performance requirements. 5.1.3 Accelerator Industrial CT Radiation safety design and manufacturing should follow the principles of redundancy, diversity and independence to ensure that when A component or system failure, as well as a variety of accident conditions, can still ensure the safety of personnel and the environment radiation. 5.1.4 Accelerator Industrial CT control switch, operation button, etc. should be reliable, visual eye-catching, feel clear. 5.2 Radiation safety and protective performance requirements 5.2.1 Radiation shielding material and thickness of the accelerator head should take into account the energy such as the energy of the ray, the intensity of the beam and the target material, The maximum air ratio of the kinetic energy is designed and the accelerator leakage dose ratio should be less than 0.1%. When the energy is higher than 10MeV, Consider neutron protection measures, such as the use of high and low density composite materials, increase boron, paraffin and other neutron protective materials. 5.2.2 Accelerator head should be ray beam device, such as collimator, aperture and so on. The radiation beam device collimates the beam into a certain thickness Fan-shaped beam or cone beam, the beam angle or taper angle of the beam should be as small as possible when the imaging requirements of the industrial CT are met. 5.2.3 The accelerator system shall provide a hardware interface to the industrial CT and the corresponding control procedures, allowing the industrial CT control system pair Accelerator for ray switch, pulse repetition frequency setting and other operational control and work status monitoring. 5.2.4 In addition to special circumstances such as commissioning or maintenance, only when the output signal from the industrial CT control system is received, the accelerator The system can be added to the high pressure beam, and communication with the industrial CT for some reason, the accelerator should be able to automatically shut down. 5.2.5 Industrial CT control systems shall have the following functions to achieve safe and reliable control of the accelerator system. A) a reliable communication interface with the accelerator; B) can control the accelerator's ray switch, pulse repetition frequency, beam time, etc.; C) Accelerator Industrial CT console should show the accelerator working condition, the beam discharge rate, the beam time, the trigger frequency, the trigger side And other parameters. 5.2.6 Accelerator system should be with the detection room protection doors, emergency stop button, the source of the source switch to achieve safety interlock. Only met Detection room protection door closed, emergency stop button reset, ray source switch key closing and other interlocking conditions, and accelerator system, industrial CT equipment are ready, industrial CT control system to the accelerator system issued a beam allowable signal before you can start the accelerator beam Perform CT scan detection. Accelerator Industrial CT safety interlock logic design can refer to Appendix B (informative). 5.2.7 before the accelerator system beam out, there should be no less than 10 seconds of sound, light warning signal, sound, light warning signal after the end of the accelerator The system can be added to the pressure beam; after the beam should continue to sound, light signal until the stop so far. In the process of laying out, the joint of 5.2.6 Lock conditions, if not satisfied, the system should immediately cut off the high pressure to stop the beam, and issued a warning signal; 5.2.8 Accelerator system and industrial CT control system operation control procedures should be set password, without unit radiation safety management personnel allowed May not be modified.6 Accelerator Industrial CT workplace radiation safety and protection requirements6.1 Accelerator Industrial CT workplace location, layout and architectural design shall comply with relevant radiation safety regulations and standards. Seeking, to ensure the construction, structural construction quality, to protect the workplace and the surrounding environment. 6.2 Accelerator Industrial CT workplace should be arranged rationally, the testing room and the control room and other auxiliary space should be separated, the control room and other personnel Frequently active areas, should avoid the direction of useful wiring harness. Workplace and radiation safety facility layout design can refer to Appendix C (Informative) Accelerator Industrial CT Workshop and Radiation Safety Facility Layout Example. 6.3 primary radiation (useful beam) direct protection of the protective wall (including the ceiling) by the main radiation shielding requirements of the design, the rest of the wall Designed by secondary radiation shielding requirements. Ceiling radiation shielding thickness design, should also consider the impact of sky scattering on the surrounding environment. In the calculation When shielding the thickness, consider 2 times the safety factor. Lead to the test room of the wire, catheter design should use "U" or "Z" and other design, Do need to cross the protective wall, should not affect the radiation shielding effect. 6.4 Protective doors should be provided at the entrance and personnel entrance of the test room. Protection between the door and the wall of the overlap between the reasonable, gap and lap ratio Should be less than 1/10. When the accelerator energy is greater than 10 MeV, the frog and the protective door should consider neutron and neutron capture Line protection. The shielding material shall include neutron protective materials such as boron-containing polyethylene or boron-containing paraffin. 6.5 Inspection room should be in accordance with the design drawings and the relevant national standards for civil engineering and ancillary works of the construction and installation, to ensure that Construction quality and radiation shielding effectiveness. In the construction of radiation protection and safety facilities involved in the modification, should obtain the consent of the design unit and Shall be submitted to the examination and approval department for approval and make a record for inspection and acceptance. 6.6 Inspection room The protection doors at all entrances shall be interlocked with the accelerator industrial CT. When the protective door is opened, the accelerator can not be pressurized bundle. Accelerator out of the state of the protection door is opened, the accelerator should automatically cut off the high pressure to stop the beam, through the console reset operation, Can be added once again high pressure out of the beam; detection room personnel should be set to enter the vagina, useful wiring harness should try to avoid the workpiece entrance, control Room and fans. The inside of the test room should be equipped with a clear emergency door opening switch to ensure that the abnormal situation of personnel from the detection The room quickly opened the door to leave. 6.7 Emergency stop button, test room wall, vagina, etc. should be installed on the test room, the fans, the accelerator head and the industrial CT console. You should install the check reset button. Emergency stop button, reset button and emergency door switch should be set with a clear logo. In an emergency stop After the machine, the accelerator can only be restarted by resetting again. 6.8 The test room should be equipped with ventilation device, designed to ensure that indoor and outdoor air quality testing to GB 3095 requirements. 6.9 The test chamber shall be provided with a fixed dose monitoring device to monitor the beam out of the accelerator. 6.10 detection room should have a monitoring device, the camera should be installed to ensure that the installation of the test room, especially the accelerator can be used within the harness area As, and set up a dedicated monitor in the control room. If necessary, in the detection room and control room between the installation of communications equipment.7 Accelerator Industrial CT Safety Operating Requirements7.1 General requirements 7.1.1 Accelerator Industrial CT operators and specialists should be trained in radiation protection safety and professional and technical training, And qualified by the examination. Operators should also comply with the physical health conditions of the radiographers in GB 9445 and accept industrial CT Nondestructive testing professional training. 7.1.2 The operator shall periodically check the safety interlock of the accelerator industrial CT, the emergency stop button, and the source of the radiation, as required by Appendix D. The key, the ventilation and the dose monitoring and warning signs and devices, etc., to confirm that it is in a normal state. 7.1.3 Before entering the test room, the operator shall confirm that the accelerator is in a stopped state and that it should be pulled out of the radio source switch key. 7.1.4 Before each accelerator is ejected, the operator should inspect the test room and the vagina, and confirm that there is no one in the detection room and the door Closed before opening the accelerator beam. Once the device is found abnormal, should immediately turn off the beam and stop the inspection, not found in the reasons and dimension Before the end of the repair, the accelerator shall not be put into use. 7.1.5 Accelerator Industrial CT operation, installation commissioning and maintenance personnel During the course of work, personal dosimeters should be fitted as required. During the commissioning and maintenance of the accelerator equipment, the staff member shall, in addition to the personal dosimeter, wear the individual agent a......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of HJ 785-2016_English be delivered?Answer: Upon your order, we will start to translate HJ 785-2016_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. The lengthier the document the longer the lead time.Question 2: Can I share the purchased PDF of HJ 785-2016_English with my colleagues?Answer: Yes. 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