A feasibility study of a remote radiation monitoring system using an autonomous unmanned helicopter, mounted with a radiation detector and three CCD cameras, was carried out for surveying the dose-rate distribution of environmental radiation. This system can fly to destinations and return under automatic operation, measure radiation data during flight, and immediately transmit the data, including images, to a monitoring station on the ground. It is also possible to monitor the data on a map on a computer display in real time. Flight tests confirmed that the system can measure fluctuations of dose-rate distribution on the ground, and could be used for radiation monitoring in case of a nuclear emergency.
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Okuyama et al. (2008) studied this question.