Low energy gamma rays up to 10 MeV is a type of high frequency electromagnetic radiation produced by decay of radioactive elements and by electric discharges present in the environment. The intensity of this radiation varies according to the location on the planet. Measurements of gamma radiation from 200 keV to 10.0 MeV were carried out in the Technological Institute of Aeronautics -ITA campus, in São José dos Campos, São Paulo, Brazil. In addition, measurements of this radiation were made within 10 min in the environment with radioactive sources (cesium Cs-137, polonium Po-210, and strontium Sr-90) placed on the scintillator. A generation of the spectra was studied in function of the energy, always in the same time interval. Thus, it was possible to determine the presence of the natural gamma radiation in the soil-atmosphere interface for this energy range. ReSumo Raios gama de baixa energia, até 10 MeV, é um tipo de radiação eletromagnética de alta frequência produzida geralmente por decaimentos radioativos e descargas elétricas presentes no meio ambiente. Essa radiação, cuja intensidade varia a cada localidade do planeta, pode causar danos aos seres vivos. Foram efetuadas medidas da radiação gama de 200 keV até 10,0 MeV no campus do Instituto Tecnológico de Aeronáutica -ITA, em São José dos Campos, São Paulo, Brasil. Também foram realizadas medidas dessa radiação no intervalo de 10 min, no meio ambiente com fontes radioativas (césio Cs-137, polônio Po-210 e estrôncio Sr-90) colocadas sobre o cristal cintilador. Com o estudo da geração dos espectros em função da energia sempre no mesmo intervalo de tempo, foi possível determinar, para este local, a presença da radiação gama natural na interface solo-atmosfera. Palavras-chave: Radiação ionizante, Raios gama, Detector de radiação gama.
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