| 内容記述 | Information on the radioactivity distribution inside and outside houses is useful for indoor external dose assessments. In this study, we collected both soil samples around the target houses and house material samples (i.e., of the floor, inner wall, ceiling, outer wall, and roof). The radioactivity of the samples was measured using a high-purity germanium detector. The surface contamination densities of the floor, inner wall, ceiling, outer wall, and roof relative to the ground were 3 times 10-3sim7 times 10-2, 6 times 10-5sim4 times 10-4, 7 times 10-5sim3 times 10-4, 2 times 10-3sim1 times 10-2, and 4 times 10-3sim2 times 10-1, respectively. The relative surface contamination densities varied depending on the material, its location, and the orientation of the surface. |
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