| Name: | Description: | Size: | Format: | |
|---|---|---|---|---|
| 4.54 MB | Adobe PDF |
Authors
Abstract(s)
Na região de Quarta-feira (freguesia de Sortelha, concelho do Sabugal), funcionaram várias explorações mineiras durante grande parte do século XX. Devido à falta de legislação, os resíduos foram depositados em escombreiras, havendo a possibilidade do material estar contaminado.
Este trabalho consistiu em analisar as escombreiras de duas antigas explorações mineiras de urânio da região (Carrasca e Vale d’Arca). O estudo consistiu em determinar os níveis de radiação gama na zona das escombreiras, analisar a mobilidade dos materiais e identificar os elementos radioactivos presentes.
Foram elaboradas cartografias das duas explorações mineiras com os níveis de dose absorvida no solo e a 1 metro de altura. Nalguns locais foram obtidos valores superiores a 3 microSievert por hora. Para verificar a estabilidade de taludes, realizaram-se ensaios correntes de Mecânica dos Solos e concluiu-se que existe instabilidade de materiais. Também foram visíveis casos de ravinamento e “creep” no solo.
Para identificar os contaminantes, realizaram-se ensaios de espectrografia por cintilometria e identificaram-se radionuclídeos descendentes do rádio.
Neste momento foi iniciada a reabilitação ambiental de ambas as explorações mineiras coordenada pela EDM (Empresa de Desenvolvimento Mineiro).
Several Uranium and Radium mining complexes have been active during most of the XXth century at the region of Quarta-feira (Sortelha, Sabugal municipality). Due to lack of legislation, waste materials have been deposited in heaps, along with possible contaminated material. This work aims to analyze the two heaps of previous uranium mines in the region (Carrasca and Vale d’Arca) in order to determine the levels of gamma radiation in the area of the heap, to analyze the mobility of the material and identify the radioactive elements. Maps were prepared with the two mining radiation levels in the soil and 1 meter in height. In some places values over 3 microSievert per hour were registered. To check the stability of slopes essays of Soil Mechanics were preformed and it was possible to verify that there is possible instability of materials. Cases of ravine in the waste materials were also visible. To identify the radioactive contaminants, scintillation spectrography was performed, and it was possible to verify that the identified isotopes were descendants of the uranium-238 series. At this time the environmental rehabilitation of both mining has begun coordinated by EDM (Minning Development Enterprise).
Several Uranium and Radium mining complexes have been active during most of the XXth century at the region of Quarta-feira (Sortelha, Sabugal municipality). Due to lack of legislation, waste materials have been deposited in heaps, along with possible contaminated material. This work aims to analyze the two heaps of previous uranium mines in the region (Carrasca and Vale d’Arca) in order to determine the levels of gamma radiation in the area of the heap, to analyze the mobility of the material and identify the radioactive elements. Maps were prepared with the two mining radiation levels in the soil and 1 meter in height. In some places values over 3 microSievert per hour were registered. To check the stability of slopes essays of Soil Mechanics were preformed and it was possible to verify that there is possible instability of materials. Cases of ravine in the waste materials were also visible. To identify the radioactive contaminants, scintillation spectrography was performed, and it was possible to verify that the identified isotopes were descendants of the uranium-238 series. At this time the environmental rehabilitation of both mining has begun coordinated by EDM (Minning Development Enterprise).
Description
Keywords
Indústria extractiva mineira - Contaminação de solos Radiação ionizante Radiação não ionizante Radiação cósmica Solos - Contaminação radioactiva - Avaliação Exploração mineira - Urânio - Aspectos ambientais