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See Chinese contents: GBZ 125-2009 GBZ 125-2009: Radiological protection requirements for gauges containing sealed radioactive source
This Standard specifies the radiological protection requirements and safety requirements of detection instruments of source container and sealed radioactive source, and requirements of radiological protection testing and inspection. This Standard is applicable to those detection instruments with sealed source and based on particle fluence measurement - such as the level gage, densimeter, hygrometer and nuclear scale.
