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Measures of ionizing radiation were observed in a tower which is 20 meters above the ground relative height. They show a distinct period of 24 hours oscillation during this February11 to April 11, 2015. It is suggested that these oscillations originate from radon gas (Rn) vented from the ground floor. One Russian specific Geiger tube with associated electronics developed at ITA was used. Monitoring of ionizing radiation from 30 keV to 10 MeV shows that the X and gamma rays up to 3.0 MeV is prevalent in the region comes from the Radon gas Rn that decay in Bi and Pb in the energies of the gamma rays 0.269, 0.609 and 1.05 MeV respectively. Then, with this simple, portable instrument was possible to monitoring the dynamics of radon gas in the region every interval minutes.

Monitoring of Ionizing Radiation Using Geiger Instrument during February to April 2015 in Sao Jose Dos Campos, SP, Brazil