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Natural Background Radiation . Background radiation is the radiation that is present in the natural environment. This natural background radiation is attributable to three main sources: cosmic radiation, terrestrial sources, and internal irradiation caused by the radioactive decay of naturally occurring substances. RADIATION FROM NATURAL BACKGROUND AND MAN-MADE SOURCES AS ... (Wesley Gibbs) Background radiation is a measure of the level of ionizing radiation present in the environment at a particular location which is not due to deliberate introduction of radiation sources. Naturally-occurring radioactive materials are an inherent part of our living Natural background radiation exposes us to a dose of slightly under one millisievert, that is. This chapter deals with gamma background radiation that is exposed to two major natural sources: normal sources that are earthly gamma rays and astronomical rays. Background radiation comes from both natural and artifici
