Análise da concentração de Radônio-222 nas águas subterrâneas e solo de Curitiba e região metropolitana

Abstract

This present study describes the concentration of 222Rn in groundwater in Curitiba and urban region, and measurement made in soil, and concentrations of 226Ra in water. The research shows the steps for acquisition of water samples in conventional wells and boreholes in Curitiba and urban region, the determining the concentration of 222Rn with the ionization chamber AlphaGUARD®, the construction of a probe and a special drill to collect the 222Rn soil, the methodology for collecting the gas in the soil, and determining the concentration of 226Ra using equations based on the values of concentrations of 222Rn. Samples were collected from 47 locations. There was a higher frequency of samples with concentration of 222Rn between 20.1 Bq/L to 50 Bq/L, and concentration 226Ra between 1.1 Bq/L to 2.0 Bq/L. In the ground were made measurements in four regions, where the highest concentration found was 38,523 Bq/m³. The southern region of Curitiba was the place where there were higher concentrations of 222Rn and 226Ra.