各種建築材料のγ線減弱係数および線量ビルドアップ係数

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The present paper describes the γ-ray attenuation coefficient and the dose buildup factor of various building materials, which are of great importance for estimation of the shielding effect of residential houses against γ-rays.The linear attenuation coefficients were measured for 19 building materials with γ-rays and filtered X-rays at energies ranging 44-1, 250keV. A corresponding atomic number, Zcor, was defined as an atomic number of the element having the mass attenuation coefficients akin to those of the material. According to Zcor, materials were classified into two groups: one is Zcor=7-9 and the other is Zcor=13-16.The dose buildup factors were measured for 4 materials selected from each material group with γ-rays and filtered X-rays at energies ranging 68-1, 250keV. It was found for the thin materials such as ordinary building materials, that the dose buildup factor could be represented approximately by the linear formula, BD=1+αμt, and α was characterized by both γ-ray energy and material group.