The air survey is specially superior in the regional environmental radioactivity survey,which is recommended by IAEA.Through more than ten years research.We have established the perfect metrological standard equipment and calibrating method,we have had the ability to provide the metrological assurance for the environmental radioactivity air survey.During the process of decommissioning of the nuclear facilities,we can hold the information fully of the radioactivity radiation of the decommissioning nuclear fa...