This standard specifies the radiation protection and safety requirements for source containers and detection instruments containing sealed radioactive sources (hereinafter referred to as "sealed sources"), as well as radiation protection inspection and inspection requirements. This standard applies to detection instruments containing sealed sources based on particle fluence measurement (hereinafter referred to as detection instruments), including level meters, density meters, hygrometers, nuclear scales, etc. 2 Normative References: The clauses in the following standards are referred to as clauses in this standard. For dated reference documents, all subsequent amendments (excluding corrected content) or revised versions do not apply to this standard. However, parties to agreements based on this standard are encouraged to study whether the latest versions of these documents can be used. For undated references, the latest version applies to this standard. GB 4075 General Requirements and Classification for Sealed Radioactive Sources GB 11806 Regulations for the Safe Transport of Radioactive Materials GB 14052 Radiation Safety Performance Requirements for Isotope Instruments Installed on Equipment GB 18871 Basic Standard for Ionizing Radiation Protection and Source Safety GBZ128 Personal Monitoring Specification for Occupational External Exposure GBZ/T 208 Classification of Radioactive Sources Based on Hazard Index 3 Terms and Definitions The following terms and definitions apply to this standard. 3.1 Radioactive source container Place a sealed source in the correct geometric position and provide sufficient shielding protection to keep the surrounding radiation level below the specified value of the container. The source container can also be equipped with source gates to control the opening and closing of useful wiring harnesses, as well as radiation status indicators. 3.2 Useful bundle uses the beam to radiate through the window, light barrier, conical hole, or other shaped collimating device of the source container
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