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Intensity variation of gamma radiation on ground level interface in São José dos Campos, SP, Brazil

Author(s): Inácio Malmonge Martin, Marcelo Pêgo Gomes

In the period June 22 to September 24, 2012 São José dos Campos region experienced dry climate with low relative humidity. The net rain intensity measured in this period was 60mmand the relative humidity range between 30% to 40% on most days. The intensity of gamma radiation from 0.03 to 10.0MeV, in themeasurement period presents a daily fluctuationwell clearly, and some small increases when there is rainfall. These measures were realized at ITA’s campus with a scintillator of NaI (Tl), photomultiplier and associated electronics laptop to a Dell 630 PC.Adata acquisition interface purchased from(Aware Eletronics, USA) provides a file withmeasurements versus time, in the range from minute to minute recorded in txt. It was observed that the variation of gamma radiation in the interface soil/air at the region is originating from the local radon gas dynamics and of the presence of wind shear near the ground level.

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