This paper compares several methods for estimation of the effective indoor dose of gamma radiation from building materials. It was found that specific dose ratios proposed for 3 cm thick layers in one recommendation gives 2.8 times lower value of gamma dose than other methods. The most common case is that granite has an elevated content of natural radionuclides and it is usually used in the form of decorative layers. If the decision about restricted or non-restricted use of granite as a building material is based on method which underestimate gamma dose, there is reasonable concern that materials having elevated concentrations of natural radionuclides than allowed will be used in dwellings. In addition, it is pointed out that existing regulations allow in some cases non-restricted use of building materials even in the case when their activity concentrations exceed exception limits.

中文翻译：

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建筑材料有效辐射的室内剂量：几种估算方法的比较和可能的低估

本文比较了几种从建筑材料估算伽玛射线有效室内剂量的方法。已发现，在一项建议中建议的3 cm厚层的特定剂量比所提供的γ剂量值比其他方法低2.8倍。最常见的情况是花岗岩中天然放射性核素的含量较高，通常以装饰层的形式使用。如果基于限制或非限制使用花岗岩作为建筑材料的决定是基于低估伽马射线剂量的方法，则有理由担心，住宅中将使用天然核素浓度高于允许范围的材料。此外，