Detection of radioisotope 137Cs in the Andes mountain of Santiago, Chile
S. Donoso 1, S. Godoy 1, J. R. Morales 1, R. Correa Devés 2*, L. Da Silva 3, E. Mera 2
1 Universidad de Chile, Facultad de Ciencias, Departamento de Física, Santiago, Chile
2 Departamento de Física, Universidad Tecnológica Metropolitana de Chile, Santiago, Chile
3 Departamento de Física, Universidad Técnica Federico Santa María, Valparaíso, Chile
The aim of the present work is to analyze the samples of composed soils to detect the presence of radioactive elements and its origin. The radioisotope can be of natural and artificial radiation. The first one is related with half-life radionuclide similar to the life of the earth, and the second one, with short half-life, is derivate of human nuclear experiment activity and its consequence. To know if the artificial radioactivity exists in the analyzed samples we studied the presence of the 137Cs that has a half-life of 30.1 year . The study carry out in the Andes mountain of Santiago, Chile ( 37.8 S – 62.7 W ) and we collected 14 samples at different altitude above sea level in a range of (900 m – 1800 m). Thirteen samples are composed of soils and one is composed of river sediment, in which are detect radionuclide originated in the decay series of 232Th and 238U , and also the 40K, whose presence is evident in the earth . All the soils samples contained the radioisotope 137Cs. The experiments carry out in the Nuclear Laboratory of Faculty of Science in the University of Chile, where we use a high resolution spectroscopy system whit HPGe detector. In the Figure is showed a typical collected specter whit the natural radionuclide detected and the presence of artificial radioisotope 137Cs, which we will analyze in futures work the detail of the causes of its presence.
 Table of Isotopes, 7th edition. Lederer et al. (1978).
 M. Tzortzis et al., Rad. Measurements 37, 221 – 229 (2003)
Typical collected specter whit the natural radionuclide detected and the presence of artificial radioisotope 137Cs