Characteristic parameters and radon exhalation rates of aerated concrete blocks  

作　　者：Yanchao Song Junlin Wang Hongxing Cui Bing Shang Changsong Hou Yunyun Wu 

机构地区：[1]Key Laboratory of Radiological Protection and Nuclear Emergency,China CDC,National Institute for Radiological Protection,Chinese Center for Disease Control and Prevention,Beijing,100088,China [2]China Institute of Atomic Energy,Beijing,102413,China

出　　处：《Radiation Medicine and Protection》2024年第4期233-237,共5页放射医学与防护(英文)

基　　金：financially supported by the National Natural Science Foundation of China(No.11375164 and 12105274).

摘　　要：Objective:To understand the characteristic parameters and radon exhalation rates of aerated concrete blocks.Methods:A total of 39 nationally inspected samples were measured.Their dry density was determined based on their mass and volumes,their porosities were measured on the principle of volumetric expansion,and their radium content was determined using a high-purity germanium(HPGe)detector for gamma-ray spectroscopy.Furthermore,their diffusion lengths were quantified by establishing a combined cumulative and diffusion chamber,and their radon exhalation rates were measured through closed-box testing using a continuous radon monitor.Results:The aerated concrete blocks exhibited dry densities ranging from 464 to 840 kg/m^(3)[average:(654.0±82.5)kg/m^(3)],open porosities from 67.1%to 81.1%[average:(74.3±3.3)%],radium(^(226)Ra)content from 12.3 to 136 Bq/kg[average:(63.0±30.4)Bq/kg],diffusion lengths from 0.49 to 1.01 m[average:(0.70±0.15)m],and radon exhalation rates from 0.6 to 22.8 Bq·m^(-2)·h^(-1)[average:(7.3±5.3)Bq·m^(-2)·h^(-1)].Conclusion:Aerated concrete blocks exhibit significantly higher porosities,diffusion lengths,and radon exhalation rates than traditional concrete and clay bricks.These blocks might contribute to the high indoor radon concentration observed in modern buildings in China.

关 键 词：RADON Exhalation rate Aerated concrete block 

分 类 号：TU528[建筑科学—建筑技术科学]