Radiactividad natural en la zona costera del departamento de Rocha, Uruguay

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The Uruguayan east coast shows an important heterogeneity of habitats including sand dunes, sea, underground and ground water with a wide diversity of flora and fauna . The area also has several mineral resources, which include black sand ores, with 7 million tons of heavy minerals evaluated in the...

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Autores principales:	Noguera, Ana, Bentos Pereira, Heinkel, Fornaro, Laura
Formato:	Articulo
Lenguaje:	Español
Publicado:	2013
Materias:	Ecología Uruguay yacimiento de arenas negras
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/60695
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

id	I19-R120-10915-60695
record_format	dspace
spelling	I19-R120-10915-606952024-10-28T12:36:43Z http://sedici.unlp.edu.ar/handle/10915/60695 Radiactividad natural en la zona costera del departamento de Rocha, Uruguay Natural radioactivity in Rocha coast zone, Uruguay Noguera, Ana Bentos Pereira, Heinkel Fornaro, Laura 2013 2017-06-16T12:42:30Z es Ecología Uruguay yacimiento de arenas negras The Uruguayan east coast shows an important heterogeneity of habitats including sand dunes, sea, underground and ground water with a wide diversity of flora and fauna . The area also has several mineral resources, which include black sand ores, with 7 million tons of heavy minerals evaluated in the Aguas Dulces-Valizas area. Black sand ores are composed by several minerals which include 0.6 % of monazite. Thus, all radionuclides belonging to the 238U and 232Th series are present. In order to evaluate the transfer of natural radioactive contamination from sand to other compartment, the gross alpha and beta activity was measured using a Analyzing miniscaler Ratemeter model PRS-5/STB-3 in sand, underground water and vegetation (Hydrocotile bonariensis Lamarck) from Valizas beach ((34º 20´ 31.42” S y 53º 47´ 19.47” O). All samples were pre-treated: the sand was dried, the water were acidified with HNO3, and cooled to 4º C for conservation and then dried, the vegetation was calcinated and the ash was measured. Standards 238U and 232Th ((IAEA RGU-1, RGTh-1) was also measured. From the specific activity and the obtained transfer coefficients, we can conclude that natural radioactive contaminants move from the sand to other compartments. The sandto- plant (H. bonariensis) transfer coefficient is the highest; but is in the range reported in the literature. Underground fresh water value is below the intervention level for drinking water (0.55Bq.l-1). La costa este uruguaya posee una gran heterogeneidad de hábitats como ser dunas, mar, ríos, arroyos y aguas subterráneas, que portan una inmensa variedad de fauna y flora. En dicha área están presentes además recursos minerales, los cuales incluyen yacimientos de arenas negras, con 7 millones de toneladas de metales pesados evaluados en el área de Aguas Dulces – Valizas. Estos yacimientos están compuestos entre otros minerales por 0.6 % of monacita. Como resultado están presentes todos los radionucleidos pertenecientes a la serie del 238U y del 232Th series. A los efectos de evaluar la transferencia de la contaminación radiactiva natural desde arena a otros compartimentos la actividad total alfa y beta fue determinada utilizando Analyzing miniscaler Ratemeter modelo PRS-5/STB-3, para arena, aguas subterráneas y vegetación (Hydrocotile bonariensis Lamarck) del Balneario Valizas (34º 20´ 31.42” S y 53º 47´ 19.47” O). Todas las muestras fueron previamente tratadas, las muestras de arena fueron secadas, las aguas tratadas con HNO3, mantenidas a 4 º para su conservación y llevadas a sequedad, finalmente los vegetales fueron calcinados y las cenizas medidas. Fueron utilizados patrones de 238U y 232Th (IAEA RGU-1, RGTh-1). De las actividades específicas y de los coeficientes de transferencia obtenidos podemos concluir que los contaminantes radiactivos naturales migran de la arena a otros compartimentos. El coeficiente de transferencia de arena a H. bonariensis es el más elevado y está de acuerdo a los resultados previamente reportados en la literatura. Los valores obtenidos para aguas subterráneas están por debajo del límite de intervención determinado para agua potable (0.55 Bq.l-1). Comité de Medio Ambiente Articulo Articulo http://creativecommons.org/licenses/by-nc-sa/3.0/ Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported (CC BY-NC-SA 3.0) application/pdf 212-218
institution	Universidad Nacional de La Plata
institution_str	I-19
repository_str	R-120
collection	SEDICI (UNLP)
language	Español
topic	Ecología Uruguay yacimiento de arenas negras
spellingShingle	Ecología Uruguay yacimiento de arenas negras Noguera, Ana Bentos Pereira, Heinkel Fornaro, Laura Radiactividad natural en la zona costera del departamento de Rocha, Uruguay
topic_facet	Ecología Uruguay yacimiento de arenas negras
description	The Uruguayan east coast shows an important heterogeneity of habitats including sand dunes, sea, underground and ground water with a wide diversity of flora and fauna . The area also has several mineral resources, which include black sand ores, with 7 million tons of heavy minerals evaluated in the Aguas Dulces-Valizas area. Black sand ores are composed by several minerals which include 0.6 % of monazite. Thus, all radionuclides belonging to the 238U and 232Th series are present. In order to evaluate the transfer of natural radioactive contamination from sand to other compartment, the gross alpha and beta activity was measured using a Analyzing miniscaler Ratemeter model PRS-5/STB-3 in sand, underground water and vegetation (Hydrocotile bonariensis Lamarck) from Valizas beach ((34º 20´ 31.42” S y 53º 47´ 19.47” O). All samples were pre-treated: the sand was dried, the water were acidified with HNO3, and cooled to 4º C for conservation and then dried, the vegetation was calcinated and the ash was measured. Standards 238U and 232Th ((IAEA RGU-1, RGTh-1) was also measured. From the specific activity and the obtained transfer coefficients, we can conclude that natural radioactive contaminants move from the sand to other compartments. The sandto- plant (H. bonariensis) transfer coefficient is the highest; but is in the range reported in the literature. Underground fresh water value is below the intervention level for drinking water (0.55Bq.l-1).
format	Articulo Articulo
author	Noguera, Ana Bentos Pereira, Heinkel Fornaro, Laura
author_facet	Noguera, Ana Bentos Pereira, Heinkel Fornaro, Laura
author_sort	Noguera, Ana
title	Radiactividad natural en la zona costera del departamento de Rocha, Uruguay
title_short	Radiactividad natural en la zona costera del departamento de Rocha, Uruguay
title_full	Radiactividad natural en la zona costera del departamento de Rocha, Uruguay
title_fullStr	Radiactividad natural en la zona costera del departamento de Rocha, Uruguay
title_full_unstemmed	Radiactividad natural en la zona costera del departamento de Rocha, Uruguay
title_sort	radiactividad natural en la zona costera del departamento de rocha, uruguay
publishDate	2013
url	http://sedici.unlp.edu.ar/handle/10915/60695
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Radiactividad natural en la zona costera del departamento de Rocha, Uruguay

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