Determinación del coeficiente de exhalación másico de los materiales de construcción más usados en el cantón Riobamba.

Abstract

The mass exhalation coefficient of the most used construction materials in the Riobamba canton has been determined, for which a classification of these materials was carried out, the experimental configuration for this work was characterized, and the dose rate was calculated due to the concentration of radioactive material in the construction materials. The method used in this study is called the closed chamber, which consists of introducing a sample in a tempered glass chamber for approximately 3 days, and with the help of a Rad7 radon detector it is possible to determine the concentration of 222Rn inside the chamber. Thanks to the information provided by the Ministry of Housing and Urbanization (MIDUVI) and INEC about the construction materials most used in a standard house in the Chimborazo province and the Riobamba Canton, it was possible to classify the construction materials that were used in this study, it was also decided to make an analysis to certain traditional construction materials, one of a church located in the Riobamba canton and of a high school belonging to the Riobamba canton. The experimental configuration was characterized by calculating the leakage rate of the chamber which is 0.0051 (h1) (24%). Concentrations of 222Rn have been very low in several construction materials used today especially in bricks, concrete and granite samples. On the other hand traditional construction materials have shown a little high values, the exhalation of the rock sample from the high school auditorium was much higher compared to the other samples analyzed, the dose rates of the building materials currently used do not exceed the UNSCEAR recommendation of 1,1 microsievert/year, but in the case of the high school rock it is 1.25 microsievert/year, thus exceeding the recommendation.