Regulations for radiation protection and safety of gamma irradiation facilities
1 Scope
This standard specifies the requirements of radiation and contamination control, division of radiation workplace, radiation protection and safety design, environmental assessment, radiation safety management, radiation safety detection, decommissioning and accident emergency of gamma irradiation facilities using Class I radioactive sources.
This standard is applicable to the radiation protection and safety of the site selection, design, construction, operation and decommissioning of gamma irradiation facilities using Class I radioactive sources.
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 (excluding corrections), or revisions, of any of these publications do not apply to this standard. However parties to agreements based on this standard 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 document referred to applies.
GB 3095 Ambient air quality standard
GB 17568 Regulations for design construction and use of gamma irradiation facilities
GB 18871-2002 Basic standards for protection against ionizing radiation and for the safety of radiation sources (IAEA Safety Series, NEQ)
HJ/T 2.2-1993 Technical guidelines for environmental impact assessment
3 Terms and definitions
For the purposes of this standard, the terms and definitions given in GB 17568, as well as the following apply.
3.1
irradiation room
space enclosed by a radiation shield in the irradiation facilities for radiation processing, which cannot be accessed by personnel due to safety interlock measures in the working state
3.2
penetrating radiation
radiation with strong penetrating power in matter, generally referring to γ radiation, X radiation and neutron radiation, specifically γ radiation transmitted from the outer surface of shield wall of irradiation room, roof and water surface of source storage well in this standard
3.3
safety interlock
important safety control system of irradiation facilities, in which the actions of relevant components are interrelated, and the actions of each component are controlled by the pre-specified state and/or condition; the radioactive source of irradiation facilities cannot be put into use from the storage state, or the radioactive source that has been or is being put into use can be immediately restored to the storage state, or personnel cannot enter the irradiation room of irradiation facilities and be exposed to the irradiation as long as any state and/or condition of any component fails to meet the pre-specified requirements
3.4
environmental impact assessment
prediction and estimation of the possible impact of the utilization of the source or a practice on the environment, including an overview of the scale and characteristics of the source or practice, an analysis on the environmental status of the site or place, and an analysis on the possible environmental impact or consequences under normal, abnormal and accident conditions
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Radiation and contamination control
5 Division of radiation workplaces
6 Radiation protection and safety design
7 Environmental assessment of irradiation facilities
8 Radiation safety management
9 Radiation safety detection
10 Management of radioactive sources
11 Decommissioning of irradiation facilities
12 Accident emergency
Annex A (informative) Design and calculation for shielding and protection of irradiation room
Annex B (normative) Harmful gas concentration limit and monitoring
Annex C (informative) Calculation of harmful gas generation and diffusion
