1 放射線地学研究所Radiation Earth Science Laboratory
2 宇陀ジオサークルUda Geoscience Club
木造の天守閣13棟及び櫓5基でNaI（Tl）スペクトロメータにより宇宙線の線量率を測定した。天守閣と櫓を多重円筒殻で近似し，屋内線量率と屋外線量率の比から円筒殻の密度と厚さを算出した。この密度に円筒殻の体積を掛けて重量を求めた。解析に必要な標高，延床面積，表面積，屋外線量率，屋内線量率，そして対応する円筒殻の密度と厚さの積及び重量を一覧表にした。他のモデル計算及び重量実測例と比較して本方法の妥当性を示した。
Cosmic ray dose rate measurements were carried out inside 13 wooden castle towers and 5 turrets using a NaI(Tl) spectrometer. Approximating a shape of each tower or turret with a multi-cylindrical shell, a density and thickness of the shell were calculated using an inside/outside ratio of dose rate. The density was multiplied by a volume of the shell in order to obtain its weight. Input data required for the model analysis for each castle tower or turret, i.e., elevation, total floor space, surface area, outside and inside dose rates, were listed along with the corresponding density and thickness of the shell and its weight derived by the model calculation. Comparison with other model calculations and examples of actual weight measurements showed the validity of the calculated results described in this report.
Key words: cosmic ray; dose rate; NaI(Tl) scintillation detector; wood; castle tower; turret; weight
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