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radon gas.Measurements through Geiger and Sodium Iodide Scintillator——Study Efficiency Comparison

Journal of Environmental Science and Engineering(A) 2017年第5期6卷 270-275页

作者： Inacio Malmonge Martin Marcelo Pego Gomes Physics Department Technological Institute of Aeronautics--4TA S6o Jos~ dos Campos SP 12228-900 Brazil

With the use ofa Geiger proportional counter with sensor tube of Russian and Chinese origin, a comparison was made in this work between measurements of environmental ionizing radiation with these detectors and a sodium iodide scintillator activated with TI （Thallium NaI）. Through measurements carried out in a room located inside a tower 25 meters high on the ITA （Technological Institute of Aeronautics） campus, it was possible to study the efficiency of the three instruments for the environmental measurement of ionizing radiations at that location. Between March 7th and June 2nd of 2017, in that region, nine intense and weak rains were observed with 12 cold fronts coming from southern Brazil. Radiation measurements and the local meteorology involved are analyzed in this work to verify possible correlations.

关键词： Ionizing radiation rain radon gas.

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Environmental Low Energy Gamma Rays Measurements in Brazilian Tropics Region During 2016

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Journal of Environmental Science and Engineering(A) 2016年第11期5卷 559-565页

作者： Inaicio Malmonge Martin Anatoli Alexandrovitch Goussev Douglas Carlos Vilela Marcelo Pego Gomes Mauro Angelo Alves Alessandro de Abreu Matheus Carlos Silva Rodrigo Rezende Femandez de Carvalho Physics Department Technological Institute of Aeronautics-ITA Sao Jose dos Campos SP 12228-900 Brazil Space Research Institute of the Russian Academy of Sciences IKI Moscow 117997 Russia

Low energy gamma radiation （0.2-10.0） MeV near the Earth＇s surface has several origins. Primary and secondary cosmic radiations with interactions of very high energy protons （〉 1 GeV） in terrestrial atmosphere are the main sources. The second most important source near the surface of the Earth and in the tropical and equatorial regions is the radon gas.（Rn-222） that decays in alpha particles and gamma rays in this energy range. Also the telluric radionuclides 238U, 235U, 40K and 232Th in decays produce gamma radiation with different intensities at different locations on the surface of the Earth. Other sources less present are electrical discharges （lightning strikes） and man-made radioactive sources for medical, dental and industrial applications. In this work, it is shown that measurements of these components during all year 2016 are carried out at the ITA （Technological Institute of Aeronautics） campus in Sao Jose dos Campos, SP, Brazil and their possible correlations with atmospheric phenomena.

关键词： Gamma radiation atmospheric phenomena electric discharges radon gas.

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