This study investigates radon and thoron activity concentrations in adobe houses of Angola. Activity concentrations were recorded by passive detectors in rainy and dry seasons in 40 dwellings located at three areas with different climatic and geological backgrounds (Cabinda, Huambo, Menongue). Regarding seasonal and spatial variations, radon activity concentrations are higher in the rainy than in the dry season and both radon and thoron levels are the highest in Huambo, the central part of the country. The number of adobe houses above certain radon and thoron levels were estimated and the contribution of thoron to the inhalation dose was significant.

中文翻译：

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居住在土坯房中的安哥拉人口的氡和钍辐射暴露

本研究调查了安哥拉土坯房中氡和钍的活性浓度。在雨季和旱季，被动探测器记录了位于具有不同气候和地质背景的三个地区（卡宾达、万博、梅农格）的 40 座住宅的活动浓度。关于季节和空间变化，雨季氡活动浓度高于旱季，氡和钍水平在该国中部万博最高。估算了高于特定氡和钍气水平的土坯房数量，钍气对吸入剂量的贡献是显着的。