GBZ 117-2002 Industrial X-ray Flaw Detection Health Protection Standard GBZ117-2002 Standard download decompression password: www.bzxz.net

Ics13.100
National occupational health standard of the People's Republic of China GBZ117-2002
Health protection standard for industrial X-ray detection
Radiological protection standards for industrial X-ray detection
2002-04-08 Issued
Ministry of Health of the People's Republic of China
2002-06-01 Implementation
1 Scope
Normative references
Terms and definitions
Radiological health protection requirements for X-ray detection equipment Radiological health protection requirements for X-ray detection workplaces Radiological protection monitoring
Appendix A (informative appendix) X-ray protection material half-value layer Determination of X-ray field operation control area and management area Appendix B (normative appendix)
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 GB16357-1996 and this standard, this standard shall prevail. Chapters 4 to 6 and Appendix B of this standard are mandatory contents, and the rest are recommended contents. Appendix A of this standard is an informative appendix, and Appendix B is a normative appendix. This standard is proposed and managed by the Ministry of Health.
The drafting units of this standard: Institute of Radiation Medicine, Shandong Academy of Medical Sciences, Dandong Instrumentation Institute. The main drafters of this standard: Su Xieming, He Guodong, Deng Daping, Qiu Yuhui, etc. The Ministry of Health is responsible for interpreting this standard.
1 Scope
Industrial X-ray Flaw Detection Health Protection Standard
GBZ117-2002
This standard specifies the radiation health protection requirements for industrial X-ray flaw detection devices and flaw detection workplaces and related personnel. This standard applies to the production and use of industrial X-ray flaw detection devices (hereinafter referred to as X-ray devices) below 500kV. 2 Normative References
The clauses in the following documents become the clauses of this standard through reference in this standard. For any dated referenced document, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, parties that reach an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For any undated referenced document, the latest version applies to this standard. GB8703 Radiation Protection Regulations
3 Terms and Definitions
The following terms and definitions apply to this standard. 3.1
X-ray defect detecting in the room for special use The working process of performing X-ray transillumination inspection on internal defects of an object in a special flaw detection room. 3.2
X-ray defect detecting on-the-spot The working process of using mobile or portable X-ray flaw detection equipment to conduct X-ray transillumination inspection on internal defects of objects outdoors, in production workshops or at installation sites
Defect detecting room
An irradiation room where the X-ray device and the object to be inspected are placed for X-ray transillumination inspection and has a certain radiation shielding effect. 4 Radiological health protection requirements for X-ray flaw detection devices 4.1 Technical requirements for protection
4.1.1 X-ray tube head
4.1.1.1 The tube head assembly of mobile or fixed X-ray devices shall be able to be fixed and locked in any required position. 4.1.1.2 The X-ray tube head shall be equipped with a beam limiting device. 4.1.1.3 The aperture of the X-ray tube head window shall not be larger than the size required for the rated maximum useful beam emission. 4.1.1.4 The X-ray tube head must have the following markings: a) Manufacturer’s name or trademark:
b) Model and serial number:
c) Rated tube voltage and rated tube current of the X-ray tube: d) Position of the focal point;
e) Date of manufacture.
4.1.2 Leakage air kerma rate
Under rated working conditions, the leakage air kerma rate of the X-ray device at 1m away from the focal point of the X-ray tube shall meet the following requirements: Tube voltage, kv
150~200
4.1.3 Controller
Leakage air kerma rate, mGy·h1
4.1.3.1 The controller must be equipped with a device to display the on or off of the X-ray tube voltage, the X-ray tube voltage and tube current, and the exposure time. 4.1.3.2 X-ray devices operating at a fixed tube voltage or fixed tube current must be equipped with a tube voltage or tube current value on the controller.
4.1.3.3 The controller must be equipped with an external alarm or indication device for high voltage connection. 4.1.4 Connection cable
For mobile or portable X-ray devices, the connection cable between the controller and the X-ray tube head or high voltage generator shall not be shorter than 20m. 4.1.5 Product manual
The product manual shall indicate the model, specifications, main technical indicators and protection performance of the X-ray device. 4.2 Test conditions for the air kerma rate of radiation leakage a) The maximum useful beam cross-sectional area of ​​the X-ray tube head window is shielded with 10 half-value layers of absorbing materials, see Appendix A (informative appendix):
b) Under rated working conditions, the air kerma rate on a spherical surface with a radius of 1m and the focus as the center is measured by a dose rate meter, which should be the average measurement value over an area of ​​100cm;
c) The error of radiation leakage monitoring should be less than 30%
4.3 Acceptance rules
4.3.1 Whether the protection performance of the X-ray device meets the requirements of this standard should be inspected by the inspection department of the production unit and sampled by the radiation health protection supervision department.
4.3.2 In the following cases, type tests should be carried out (inspections should be carried out according to the items specified in this standard). a)
Before new or old products are transferred to the factory for production;
Products in continuous production should be tested at least once a year; b)
When the product is put into production again after an interval of more than one year;
When the design, process or material of the product has changed, which may affect the protective performance of the product. a) and d) Type tests should be participated by the radiation health technical service agency designated by the provincial health administrative department of the location. The type test results should be submitted to the agency for filing.
5 Requirements for radiation health protection in X-ray flaw detection workplaces 5.1 X-ray special flaw detection room flaw detection
5.1.1 The setting of the special flaw detection room must fully consider the surrounding radiation safety, and the flaw detection room must be separated from the operating room. 5.1.2 The shielding design of the flaw detection room should fully consider the direction and range of the useful beam irradiation, the workload of the device and the outdoor conditions to ensure that the annual effective dose of outdoor personnel is less than the corresponding limit. 5.1.3 The protection performance of the door of the flaw detection room shall be the same as that of the wall on the same side, and a door-machine interlocking safety device and an irradiation signal indicator shall be installed. The X-ray device can only perform transillumination inspection after the door is closed. 5.1.4 The window of the flaw detection room must avoid the irradiation direction of the useful wire beam and shall have the shielding protection performance of the wall on the same side. 5.2 X-ray on-site flaw detection operation
5.2.1 When performing transillumination inspection, factors such as the distance between the controller and the X-ray tube and the object to be inspected, the irradiation direction, time and shielding conditions must be considered to ensure that the exposure dose of the flaw detection operator is lower than the dose limit and should reach the lowest level that can be reasonably achieved. 5.2.2 When performing transillumination inspection, the air around the object to be inspected can be designated as a control area within the range of 40μGy·h or more. For special circumstances, see Appendix B (Normative Appendix). A clearly visible "No entry to X-ray area" warning sign must be hung on the boundary of the control area. The flaw detection operator should operate outside the boundary, otherwise protective measures must be taken. 5.2.3 During the radiographic inspection, the air kerma rate outside the control area boundary is above 4uGy·h and can be designated as a management area. Warning signs such as signal lights, bells, and warning ropes must be set up on its boundaries, and a clearly visible "No entry for unauthorized personnel" warning sign must be hung. If necessary, a special person should be on guard. It should also be noted that there should not be members of the public who often stay near the boundary of the management area. 6 Radiation protection monitoring
6.1 Personal dose monitoring of on-site flaw detection workers must be strengthened. 6.2 After the dedicated flaw detection room is built, acceptance monitoring must be carried out, and when the working conditions change, attention should be paid to site monitoring. 6.3 When the working conditions and site changes of on-site flaw detection, the site must be monitored and the determined control area and management area must be verified. Appendix A
(Informative Appendix)
X-ray protection material half-value layer
Approximate half-value layer of wide X-ray beam shielding material Al
See Table Al.
Approximate half-value layer of wide X-ray beam of lead and concrete Table A1
X-ray tube voltage
Concrete
Appendix B
(Normative Appendix)
Determination of control area and management area for X-ray on-site flaw detection operation B1 The air kerma rate at the boundary of the control area is set at 40μGy·h, which is calculated based on three tenths of the annual effective dose limit of radiation workers (15mSv) and the actual weekly start-up time of 7.5h. If the actual weekly startup time t is greater than 7.5h, the air kerma rate at the control zone boundary should be calculated as follows:
K=300/t.**
Where: K-
-the air kerma rate at the control zone boundary, μGy·h-\; actual weekly startup time, h. bZxz.net
30015mSv is averaged to 50 weeks per year, that is, 300μSv. At the same time, the air kerma rate at the management zone boundary also changes accordingly. (B)
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