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Abstract
Basic experiments were performed to develop the apparatus with which we can measure the radioactive density of air borne dust directly during flight. Characteristics of the plastic scintillators as a radiation detector is investigated by airplanes. From the experimental results the detectable minimum has been estimated to be about 100 pCi/m3 assuming that the detectable limit is four times as much as the standard deviation of the background of the detector. This result shows that the direct measurement apparatus is useful for the monitor of the extraordinary situation, such as a nuclear explosion test, though the sensitivity is not sufficient for use in ordinary circumstances.