GBZ/T 150-2002 Industrial X-ray Flaw Detection Health Protection Monitoring Specification GBZ/T150-2002 Standard download decompression password: www.bzxz.net

Ics13.100
National Occupational Health Standard of the People's Republic of China GBZ/T150-2002
Radiological Protection Monitoring Procedure For Industrial X-ray detection2002-04-08 Issued
Ministry of Health of the People's Republic of China
2002-06-01 Implementation
1 Scope
2 Normative references
3 General
4 Monitoring and inspection of X-ray flaw detection equipment
5 Monitoring and inspection of X-ray special flaw detection room6 Monitoring of on-site flaw detection work place
Appendix A (Informative Appendix) Monitoring original record Appendix B (Informative Appendix) Monitoring report
Appendix C (Normative Appendix) Half-value layer of X-ray protection material Appendix D (Normative Appendix) Diagram of test position of leaked radiation air kerma rate Preface
This standard is formulated in accordance with the "Law of the People's Republic of China on the Prevention and Control of Occupational Diseases". In case of any inconsistency between the original standard GB/T17150-1997 and this standard, this standard shall prevail.
In order to accurately implement the national occupational health standard GBZ117-2002 "Industrial X-ray Flaw Detection Health Protection Standard" and ensure the health and safety of X-ray flaw detection workers and personnel related to flaw detection sites, this industrial X-ray flaw detection radiation health protection monitoring specification was drafted to unify the monitoring items, methods and cycles, and become the supporting technical specifications for the above radiation health protection standards. Appendix A and Appendix B of this standard are informative appendices, and Appendix C and Appendix D are normative appendices. This standard is proposed and managed by the Ministry of Health.
The drafting unit of this standard: Shanghai Municipal Health and Epidemic Prevention Station. The main drafter of this standard: Zhu Yongkang.
This standard is interpreted by the Ministry of Health.
Industrial X-ray Flaw Detection Health Protection Monitoring Specification 1 Scope
GBZ/T150-2002
This standard specifies the radiation health protection monitoring methods for industrial X-ray flaw detection equipment and flaw detection workplaces. This standard applies to the production and use of radiation health protection monitoring of industrial X-ray flaw detection equipment below 500kV. 2 Referenced Standards
The clauses in the following documents become clauses of this standard through reference in this standard. For any dated referenced document, its subsequent amendment (excluding errata) or revision is not applicable to this standard. However, the parties who reach an agreement based on this standard are encouraged to study whether the latest version of these documents can be used. For any undated referenced document, its latest version shall apply to this standard.
GBZ117 Standard for Health Protection of Industrial X-ray Flaw Detection 3. General Provisions
3.1 Purpose of Monitoring
Based on the requirements of GBZ117, this standard defines the items, methods and cycles of radiation health protection monitoring and related inspections for industrial X-ray flaw detection, and evaluates the results. 3.2 Monitoring Instruments
3.2.1 Verification of Monitoring Instruments
The instruments used for radiation protection monitoring of industrial X-ray flaw detection equipment shall be verified at least once a year by the statutory metrology department and obtain a certificate of qualified use. After a major repair that may involve the measurement scale, the monitoring instrument within the validity period must be recalibrated.
3.2.2 Monitoring instrument performance requirements
The instrument used to monitor the leakage radiation should have the following main performance: a) Minimum range 0~10μGy·h-;
b) Energy response 30~500keV±30%:
c) Reading response time is less than 15s.
3.3 Monitoring records and reports
The original records of the radiation health protection monitoring of industrial X-ray flaw detection should be given in accordance with Appendix A (informative appendix), and the monitoring report should be issued in accordance with Appendix B (informative appendix). 4 Monitoring and inspection of X-ray flaw detection equipment
4.1 Monitoring of air kerma rate of leakage radiation 4.1.1 Monitoring environment
The laboratory should be free of interference from other ionizing radiation. During monitoring, the X-ray tube should be at least 2m away from the wall, and there should be no other scatterers within 2m of the focus.
4.1.2 Monitoring method
The beam outlet of the X-ray tube is tightly covered with a lead cover of 10 half-value layers. The half-value layer data is shown in Appendix C (Normative Appendix). Under the conditions of rated tube voltage and tube current, the air kerma rate at the position shown in the figure in Appendix D (Normative Appendix) is monitored. The distance between the center of the radiation detector (ionization chamber) and the focus of the X-ray tube is 1m. 4.1.3 Monitoring cycle
a) Before new products or old products are transferred to the factory for production, type tests should be carried out. b) For industrial X-ray flaw detection devices in continuous production, the radiation health technical service agency shall conduct random inspections at least once a year. ) For portable industrial X-ray flaw detection devices in use, they shall be monitored once a year; for fixed industrial X-ray flaw detection devices, they shall be monitored at least once every 2 to 3 years by the radiation health technical service agency. d) Acceptance monitoring should be carried out according to the factory indicators or order contract requirements, but the radiation protection indicators must meet the requirements of GBZ117. 4.1.4 Result evaluation
According to the requirements of GBZ117, the leakage radiation air kerma rate of the X-ray flaw detection device at 1m away from the X-ray tube focus under rated working conditions should meet the requirements of Table 1. Table 1
Tube voltage, kv
150~200
4.2 Safety performance inspection of X-ray flaw detection device Leakage radiation air kerma rate, mGy·h1
When monitoring the X-ray flaw detection device, the following radiation safety performance of the device should be checked; a) Whether the X-ray tube head assembly can be locked in any required position. b) Whether the X-ray tube head assembly is equipped with a beam limiting device c) Whether the aperture of the X-ray tube beam outlet is not larger than the required size for the rated maximum useful beam emission. d) Whether the X-ray tube sleeve has the manufacturer's name or trademark; model and serial number; rated tube voltage and tube current of the X-ray tube; position of the focus: factory date and other marks. e) Whether the connecting cable between the controller of the mobile or portable X-ray flaw detection device and the X-ray tube or high-voltage generator is not shorter than 20m.
5 Monitoring and inspection of X-ray special flaw detection room 5.1 Monitoring of radiation level around the flaw detection room
5.1.1 Patrol of environmental radiation level
Radiation health protection monitoring of special flaw detection room, especially acceptance monitoring, should first be patrolled to find possible high radiation level areas. The patrol range should be determined according to the design characteristics of the flaw detection room, irradiation direction and possible problems in construction. For example, for a flaw detection room without a roof or a thin roof, if it needs to be irradiated upward, the radiation level distribution at different distances from the flaw detection room wall should be patrolled. When a flaw detection room without a fixed irradiation direction has a useful beam irradiating the four shielding walls, the radiation level at different positions on the wall and on and around the door should be patrolled. For NDT rooms with windows, special attention should be paid to the radiation levels at different distances outside the windows.
5.1.2 Fixed-point monitoring
Generally, the following points should be monitored:
a) Locations with abnormally high radiation levels found through patrols; b) 5 cm from the ground and 1 m outside the door of the NDT room, measuring the left, middle and right sides of the door; c) 5 cm from the ground and 1 m outside the wall of the NDT room or the wall of the adjacent room, measuring at least 2 points on each wall: 5
d) Locations where personnel often move around.
5.1.3 Monitoring cycle
After the completion of the dedicated NDT room, it must be inspected and monitored by the preventive design review unit, and inspection and monitoring should also be carried out when the original design is changed.
The dedicated NDT room in use shall be monitored by the radiation health technical service agency at least once a year. 5.1.4 Result evaluation
The radiation level on the side where non-radioactive workers live around the flaw detection room should not exceed 2.5μGy·h. The radiation level on the side where radioactive workers live should not exceed 25μGy·h-. 5.2 Safety inspection of flaw detection room
For special flaw detection rooms in use, the flaw detection room protective door-machine interlocking device, as well as safety measures such as beam signal indicator lights must be checked.
6 Monitoring of on-site flaw detection work sites
6.1 Zoning monitoring
6.1.1 When using mobile or portable X-ray flaw detection equipment for on-site flaw detection, it is necessary to demarcate control areas and management areas through patrol surveys in accordance with the requirements of GBZ117, and set up obvious signs or sound and light alarm devices. 6.1.2 When the X-ray flaw detection equipment, location, inspected object (material, specification, shape), irradiation direction, shielding and other conditions change, patrol surveys should be carried out again to determine new zoning boundaries. 6.2 Monitoring cycle
The radiation health technical service agency shall conduct site monitoring in any of the following situations: a) Units that newly carry out on-site X-ray flaw detection; b) Spot check once a year;
c On-site flaw detection in residential areas:
d) When personal doses are found to exceed the investigation level. 6.3 Result evaluation
The area around the inspected object with an air kerma rate of more than 40μGy·h shall be designated as a control area, and the area outside the control area with an air kerma rate of more than 4μGy·h shall be designated as a management area. Device name
Manufacturer
Monitoring items
Monitoring location and environmental conditions
Monitoring methods and instruments
Monitoring results and records
Appendix A
(Informative Appendix)
Original monitoring records
Original monitoring record table
Working conditions for monitoring the air kerma rate of industrial X-ray flaw detection device Leakage radiation 1m away from the focus Tube voltage
Monitoring point
kv, tube current
Air kerma rate
μGy·h-!
II. Location for measuring the air kerma rate in the workplace of industrial X-ray flaw detection
Tester
Tube voltage, kv
Tube current, mA
Monitoring point|| tt||Monitoring date
Total page Page
Air kerma rate
μGy·h-!
Air kerma rate, uGy·h
Reviewer
Device name
Manufacturer
Submitting unit
Submitting date
Technical basis for inspection
Inspection results and evaluation
Appendix B
(Informative appendix)
Reason for inspection
Report date
) Inspection word No.
Inspection report number
Total page No.
Appendix C
(Normative appendix)
Half-value layer of X-ray protection materials
C1 See Table C1 for the approximate half-value layer of wide X-ray beam shielding materials. Table C1 Approximate half-value layer of wide X-ray beam for lead and concrete X-ray tube voltagebzxz.net
Beam window
Appendix D
(Normative Appendix)
Half-value layer thickness, cm
Schematic diagram of test position for leakage ray air kerma rate 330°
Test plane perpendicular to X-ray tube axis
Concrete
Figure B2 Test plane parallel to X-ray tube axis 9
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