A radioactive γ/β tracer to explore dangerous technogenic phenomena has been proposed: the ratio of the measured flux density of β-and γ-radiations in the surface layer of the atmosphere. The time dependence analysis of the ratio of β and γ-pulse count rate has been carried out. A significant increase of the γ/β ratio was recorded under the cyclone passing through Japan (Fukushima) to Kamchatka. The proposed γ/β tracer can be a very sensitive indicator of non-stationary processes related to hazardous natural and technogenic phenomena.
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