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BackgroundLiquid metal sodium is used as coolant in China Experimental Fast Reactor (CEFR), the radioactive sodium aerosol in primary loop cold trap process needs to be monitored, so that the corresponding protective measures can be taken in time to ensure the health and safety of the staff. To ensure the accuracy of the monitoring results, it is necessary to calibrate the radioactive sodium aerosol monitor regularly.PurposeThis study aims to propose an effective method for the calibration of radioactive sodium aerosol monitor.MethodsA special radioactive aerosol membrane source was designed and applied to calibrating the radioactive sodium aerosol monitors. The response, relative error, and repeatability of the monitor were studied separately, and the uncertainty of the calibration factor was evaluated.ResultsThe results show that the uncertainty of response factor is 5% (k = 2).ConclusionsThis calibration method is suitable for the calibration of radioactive sodium aerosol monitors, and meets the requirements for traceability of the monitors.