Análisis de la presencia de gas radiactivo radón en agregados pétreos de la provincia de Tungurahua y su incidencia en la construcción

Abstract

This work analyzed the meteorological parameters that influence at presence of gas radon222 in the mining of building materials (gravel and sand) of Tungurahua province, the parameters analyzed were geological structure of the soil, temperature and water precipitation around of minings, furthermore is important consider the population that inhabit or frequent these places. The work determined the physical and mechanical properties of aggregates to study the influence in the emanation, transport and exhalation of radon222 and the total exhalation calculated for a concrete building with f'c 180 and 210 kilograms per square centimeter. The emanation of gas radon is limited by high percentages of moisture content in situ, and the high capacity of absorption on the aggregates, with concentrations of (18.33 plus or minus 8.89) y (21.96 plus or minus 7.84) becquerel per cubic meter in sand and gravel. The voids generated in the concrete due to the different sizes of sand and gravel determinate by granulometry test; these voids influence the gas radon222 transporting indoor of building. The effective annual dose due to radon222 inhalation, produced in a basement with a volume of 333 cubic meters of a representative housing in the area and with an occupation factor of 4750 hours per year is 0.260 milis sievert per year with a margin of error of plus or minus 10 percent.