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Abstract(s)
Quimicamente o radão é um gás nobre e radioativo que não tem cor, cheiro ou sabor, só sendo
detetado através de medições. É descendente dos metais radioativos Urânio e Tório,
existentes na crusta terrestre e abundantes em rochas e solos das regiões onde
predominam minérios radioativos e também muito comuns em terrenos graníticos, como no
caso dos distritos de Braga, Vila Real, Porto, Guarda, Viseu e Castelo Branco.
O Decreto-Lei nº 118/2013 regulamenta os sistemas energéticos de climatização em edifícios,
relativos aos materiais de construção estabelece como valor máximo de radão para casas já
construídas, 400 Bq/m3. Este trabalho tem como objetivo analisar o comportamento de
materiais de revestimento como barreiras de radão.
A parte prática deste trabalho, consiste na medição da quantidade de radão travada por
materiais de revestimento utilizados frequentemente na construção civil, tais como, tintas,
ladrilhos, madeiras, carpetes e telas. Foram fabricados provetes em acrílico de modo a testar
os materiais como barreiras e uns outros provetes para saber qual a produção de radão de cada
material. No interior de cada provete foi colocado um detetor passivo CR39 sensível ao radão.
Dos revestimentos utilizados, o que reduz mais a concentração de radão foi o flutuante
laminado acrílico. Este revestimento consegui-o reduzir em 65,3 % a concentração de radão.
Dos provetes de teste chegou-se á conclusão que o acrílico neste caso de 1 cm de espessura
reduz em 99,5 % a concentração de radão.
Chemically Radon is a radioactive noble gas that has no color, smell or taste, just being detected by measurements. It is descended from radioactive metals Uranium and Thorium, existing in the earth's crust and abundant in rocks and soils of the regions dominated radioactive ores and also very common in granitic terrain, such as in the case of districts Braga, Vila Real, Porto, Guarda, Viseu and Withe Castle. Decree-Law No. 118/2013 regulates the HVAC energy systems in buildings, for the building materials sets a maximum value for radon houses already built, 400 Bq / m3. This work aims to analyze the coating material behavior as Radon barriers. The practical part of this work consists in measuring the amount of radon locked coating materials commonly used in construction, such as paints, tiles, wood, carpet and membrane. Acrylic on specimens were manufactured in order to test the material as barriers and another samples to find out the radon production of each material. Within each specimen was placed a passive CR39 sensitive detector to radon. Of the coatings used, which further reduces the concentration of radon acrylic laminate was floating. This coating could it reduce by 65.3% the concentration of radon. Of test samples came up to the conclusion that in this case the acrylic 1 cm thick reduces by 99.5% the concentration of radon.
Chemically Radon is a radioactive noble gas that has no color, smell or taste, just being detected by measurements. It is descended from radioactive metals Uranium and Thorium, existing in the earth's crust and abundant in rocks and soils of the regions dominated radioactive ores and also very common in granitic terrain, such as in the case of districts Braga, Vila Real, Porto, Guarda, Viseu and Withe Castle. Decree-Law No. 118/2013 regulates the HVAC energy systems in buildings, for the building materials sets a maximum value for radon houses already built, 400 Bq / m3. This work aims to analyze the coating material behavior as Radon barriers. The practical part of this work consists in measuring the amount of radon locked coating materials commonly used in construction, such as paints, tiles, wood, carpet and membrane. Acrylic on specimens were manufactured in order to test the material as barriers and another samples to find out the radon production of each material. Within each specimen was placed a passive CR39 sensitive detector to radon. Of the coatings used, which further reduces the concentration of radon acrylic laminate was floating. This coating could it reduce by 65.3% the concentration of radon. Of test samples came up to the conclusion that in this case the acrylic 1 cm thick reduces by 99.5% the concentration of radon.
Description
Keywords
Decreto-Lei Nº 118/2013 Detetor Passivo Materiais de Revestimento Radão