1 Scope
This Standard specifies the protection performance requirements for industrial X-ray radiographic defect detection equipment (abbreviated hereinafter as X-ray radiographic equipment, which includes normal structure X-ray radiographic equipment, precision structure X-ray radiographic equipment, special grade X-ray radiographic protection equipment, complete X-ray radiographic protection equipment, etc), the structural protection requirements for X-ray radiographic equipment and X-ray protection during operation, the operation rules and the inspection requirements.
This Standard is applicable to the design, manufacture, installation and operation of X-ray radiographic equipment up to 500 kV.
2 Normative References
The following normative documents contain provisions which, through reference in this text, constitute provisions of this Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this Part are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies.
GB/T 17150-1997 Radiation Sanitation Monitor Specification – Part 1: Industrial Radiographic Defect Detection
GB 18871-2002 Basic Safety Standard on Ionising Radiation Protection and Radiation Sources
3 Requirements
3.1 X-ray radiographic equipment radiation leakage air kerma rate limit (shortened below as radiation leakage kerma rate)
3.1.1 Normal structure X-ray radiographic equipment
For fixed X-ray radiographic equipment, mobile X-ray radiographic equipment and portable X-ray radiographic equipment with a normal structure operating at the maximum voltage specified by the manufacturer, with the hood over the main beam window of the X-ray tube, the air kerma rate is measured by a protection level dosimeter. When the tube voltage is lower then 200 kV, the radiation leakage air kerma rate at 1 metre from the focus point should not be higher than 2.5 mGy/h and under a voltage higher than 200 kV, it should not be higher than 5 mGy/h.
