Abstract
In this experimental work, measurements of low energy gamma radiation are shown every minute and radon gas every hour during an uninterrupted period of six months. These measurements close to the ground were carried out in the city of São José dos Campos, ITA and IAE ground area in a tropical region of Brazil. Both measures show a correlation with day / night and dry and wet weather. It is observed from the measurements that most of the low energy gamma radiation originates from the exhalation in the region of radon gas and it vertical movement. During the period from January 27 to August 3, 2020, there were only six rainy intervals, the rest being very dry. These intervals are well revealed in the measurements of the local gamma radiation in energy range up to 10.0 MeV.
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