Early thoron concentration levels in Guarapari: Dosimetric implications

摘要

The three main coastal cities in Brazil with thorium-bearing monazite sands have external gamma radiation levels, in μRh~(-1), with the following ranges [a]: 60-130, in Guarapari; 130-290, in Meaipe; and 50-330, in Cumuruxatiba. One of the main objectives of this paper is to compare the internal doses received by the inhabitants of the thorium rich areas, like Guarapari, with those doses received by populations living in radon rich areas.