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GBZ 117-2022: Standard for radiological protection in industrial radiography
GBZ 117-2022
GBZ
NATIONAL OCCUPATIONAL HEALTH STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 13.100
CCS C 57
Replacing GBZ 117-2015, GBZ 132-2008, GBZ 175-2006
Standard for Radiological Protection in Industrial
Radiography
ISSUED ON: OCTOBER 13, 2022
IMPLEMENTED ON: MARCH 1, 2023
Issued by: National Health Commission of the People’s Republic of China
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative References ... 5
3 Terms and Definitions ... 6
4 Radiological Protection Requirements for Operating Organization ... 7
5 Radiological Protection Requirements for Defect Detectors ... 7
6 Radiological Protection Requirements for Stationary Defect Detection ... 11
7 Radiological Protection Requirements for Mobile Defect Detection ... 14
8 Radiological Protection Detection ... 19
Appendix A (Informative) Estimation of Distance of -ray Mobile Defect Detection
Control Zone ... 24
Bibliography ... 28
Standard for Radiological Protection in Industrial
Radiography
1 Scope
This Standard specifies the radiological protection requirements for X-ray and -ray defect
detection.
This Standard is applicable to defect detection using X-ray radiography facilities and -ray
radiography facilities of 600 kV and below (including stationary defect detectors and mobile
defect detectors). Industrial CT defect detection and non-destructive testing within the same
radiation source range for non-defect detection purposes may take this as a reference.
This Standard is not applicable to industrial defect detection performed by accelerators and
neutron defect detectors.
2 Normative References
The contents of the following documents constitute indispensable clauses of this document
through the normative references in the text. In terms of references with a specified date, only
versions with a specified date are applicable to this document. In terms of references without a
specified date, the latest version (including all the modifications) is applicable to this document.
GB/T 9445 Non-destructive Testing - Qualification and Certification of NDT Personnel
GB 11806 Regulations for the Safe Transport of Radioactive Material
GB/T 14058 Apparatus for Gamma Radiography
GB 18871 Basic Standards for Protection against Ionizing Radiation and for the Safety of
Radiation Sources
GB/T 26837 Non-destructive Testing Instruments - Stationary Type and Movable Type
Industrial X-ray Radiographic Equipment
GBZ 98 Health Requirements and Surveillance Specifications for Radiation Worker
GBZ 128 Specifications for Individual Monitoring of Occupational External Exposure
GBZ/T 250 Radiation Shielding Specifications for Room of Industrial X-ray Radiography
GA 1002 Public Security Protection Requirements for Hypertoxic Chemicals and Radioactive
Sources Storage Site
usually two source holes: the old source is pushed into one source hole of the source changer,
and the new source is removed from the other source hole.
3.7 pipe crawler
A mobile pipe defect detection device installed in the pipeline. The frame of the defect detection
device is installed in the pipeline, and the source is driven by power to translate (forward or
backward) together with the frame in the pipeline to perform radiographic defect detection on
the pipeline welds. A control source is utilized to control the forward direction and position of
the defect detection equipment.
3.8 control source
A sealed radioactive source used for guidance and positioning control of the pipe crawler.
3.9 operating organization
An operating organization that utilizes industrial defect detection device to perform industrial
defect detection.
4 Radiological Protection Requirements for Operating
Organization
4.1 The operating organization that carries out industrial defect detection shall bear the main
responsibility for radiological protection safety.
4.2 A radiological protection management organization shall be established, radiological
protection management personnel and their responsibilities shall be clarified, and radiological
protection management systems and measures shall be established and implemented.
4.3 The personnel engaged in defect detection shall be subject to personal dose monitoring in
accordance with the requirements of GBZ 128 and occupational health monitoring in
accordance with the requirements of GBZ 98.
4.4 Before starting formal work, the defect detection personnel shall obtain non-destructive
testing personnel qualifications that comply with the requirements of GB/T 9445.
4.5 Radiation dose rate meters and personal dose alarms shall be equipped.
4.6 An emergency plan for radiation accidents shall be formulated.
5 Radiological Protection Requirements for Defect Detectors
5.1 X-ray Radiography Facilities
i) Check whether the warning labels and source signs are clear;
j) Measure whether the ambient dose equivalent rate at a certain distance from the
surface of the source container complies with the requirements of 5.2.1.1 and confirm
that the radioactive source is in a shielded state.
5.2.2 Maintenance of -ray radiography facilities
5.2.2.1 Components involving radiological protection in the -ray radiography facilities shall
be regularly inspected and maintained, and problems shall be repaired in a timely manner. When
repairing the -ray radiography facilities, the manufacturer’s professionals shall pour the
radioactive source into the source changer. The personnel of the operating organization shall
not independently repair the -ray radiography facilities.
5.2.2.2 The control components of the -ray radiography facilities, including the crank handle
and the source transfer conduit, shall be frequently lubricated and scrubbed. Gears shall be
frequently lubricated, and the joints of the source transfer conduit shall be scrubbed to keep
them away from dust and grit.
5.2.3 Storage and use of radioactive sources
5.2.3.1 The operating organization shall establish a special-purpose storage warehouse for the
radioactive sources (or defect detectors with sources).
5.2.3.2 The temporary storage of source-containing containers or radioactive sources, and
control sources intermittently during mobile defect detection shall be performed in special-
purpose storage facilities. On-site storage facilities include lockable rooms, special-purpose
storage boxes or storage pits, etc. The storage facilities shall have the same level of protection
as those used at the operating organization’s main base. After temporary storage is completed,
patrol inspections shall be performed to ensure storage safety.
5.2.3.3 Radioactive source storage facilities shall reach the following requirements:
a) Rigorously control the irradiation of surrounding people, prevent radioactive sources
from being stolen or damaged, and prevent unauthorized personnel from taking any
actions that may harm themselves or the public. Ionizing radiation warning signs shall
be set up at the entrance of the storage facilities;
b) They shall be able to be used under conventional environmental conditions, be
structurally fireproof, and be kept away from corrosive and explosive hazards;
c) At the point closest to the external surface that is accessible to the public, the shielding
shall be such that the ambient dose equivalent rate is less than 2.5 Sv/h or the control
level approved by the regulatory authority;
d) The doors of the storage facilities shall be kept locked, and double-locked
management shall be implem...