Soil radioactivity in the highest volcanic region of Northern Andes.

This work studied the spatial pattern of four natural radionuclides (Ra, Ra, Th and K) as well as one artificial one (Cs) in soils in the Chimborazo province (Ecuador), which belongs to the North Andes of South America. Soil samples were collected considering the Ecuador geological map. Statistical analyses showed that activity concentrations of Ra, Ra, Th do not exceed the worldwide average, while one geological unit exceeds the worldwide average for K.