Abstract
Scintillation counters and Gray Wedge pulse height analyzer were used to measure γ-ray spectra from ground surfaces, and it was certified that there was a considerable amount of γ-ray contributions from fall-out to background radiations in the field. We measured out-door radiation dosages, distinguishing fall-out radiations from natural background γ-ray (as a dosage to human body at the height of 1m). Some simple experiments to estimate radiation dosages from natural background γ-ray were also tried. As a conclusion, we obtained the following results. In Kanto loam area, the radiation dosage from natural background γ-ray is considerably small-about one third of the world average. In Kansai district, the dosage is about equivalent or a little larger than the world average radiation dosage.
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