Niveles de radioactividad en tres regiones de Costa Rica

The establishment of the first radioactivity levels of natural radiation was carried out during the period 1991 to 1994 in three different regions of Costa Rica. The radionuclides studied belong to different soil types related to each selected region. Utilizing low level counting techniques the spec...

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Autor Principal: Mora Rodríguez, Patricia
Formato: Artículo
Idioma: Español
Publicado: 2015
Acceso en línea: http://revistas.ucr.ac.cr/index.php/cienciaytecnologia/article/view/2707
http://hdl.handle.net/10669/14590
Sumario: The establishment of the first radioactivity levels of natural radiation was carried out during the period 1991 to 1994 in three different regions of Costa Rica. The radionuclides studied belong to different soil types related to each selected region. Utilizing low level counting techniques the specific activity of the natural radioactive chains 238U daughters, 232Th and the element 40K were measured for a total of 120 samples during this period. The amount of 137Cs, as fall out radionuclide, was also studied.  The average national values in Bqkg-1 measured for 238U were 11.66 for 214Bi, 34.42 for 226Ra and 10.73 for 214Pb, for 232Th daughters were 4.08 for 208Tl, 9.65 for 212Bi and 7.62 for 228Ac. The specific activity values for 40K 95.14 Bqkg-1 and for 137Cs was 2.38 Bqkg-1. It is found that Costa Rica is not highly natural radioactive country and that the values for 137Cs are well below international reported values.