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Angular distributions of exposure rate in natural radiation environment were measured using a 1″φ×1″ NaI (Tl) scintillation detector which was placed on the axis of a set of concentric circular lead shieldings. Incident polar angle of γ ray was determined by changing the relative position between the detector and the shieldings. Incident γ rays were integrated over the whole azimuthal angle (0-2π) in each polar angle. And then, the angular distribution was obtained by subtracting the responses between each polar angle.As the incident solid angle of γ ray could be set large enough, it was possible not only to set the measuring time short but also to measure with high accuracy.Measurements were made under various environmental conditions; two on open field and one in a pine grove at a height of 1m, and one at a height of 10m on a tower. And also, one measurement was made in a one-storied wooden house. Experimental results supported the angular distributions expected from calculations, previously reported by other authors, and it was shown that this method can be applied well even where a calculational evaluation is difficult due to the complexity of its topography.
日本保健物理学会の論文