| Usefulness of systematic in situ gamma-ray surveys in the radiometric characterization of natural systems with poorly contrasting geological features (examples from NE of Portugal). | |
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MedLine Citation:
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PMID: 20971016 Owner: NLM Status: In-Process |
Abstract/OtherAbstract:
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This paper focuses on the starting point of various studies that are being carried out in two possible locations being considered to host a hypothetical site for a repository for low and intermediate level radioactive waste (LILW) produced in Portugal in compliance with international requirements on the long-term safety of this kind of repository. Previous studies concerning the geology of the much larger geographical areas where these locations are included were fundamental in the choice of these locations and for the design of the survey strategy. One of the fundamental assessment studies during the site-selection is the overall radiological characterization of the locations and its relation to the geology. This paper pretends to show the adequability of using a fast and reasonably inexpensive survey technique such as in situ gamma-ray portable detectors, to access the radiometric response of the systems in study by providing the radiometric mapping of the areas. The existence of adequate radiometric maps represents a critical pre-requisite to constrain both the number and spatial distribution of samples to be collected for further analysis, sustaining as well the subsequent extrapolation of results needed to fully characterise the surveyed system. Both areas were surveyed using portable gamma-ray spectrometers with NaI(Tl) detectors. In situ gamma-ray measurements have clearly shown not only the poorly contrasting geological features, but also their differences representing: (i) a deformed/metamorphosed ophiolite complex and (ii) a monotonous meta-sedimentary sequence. The radiometric maps obtained have show heterogeneities that reflect mostly changes in rock-forming mineral assemblages, even in the presence of small variations of gamma radiation. These maps support objective criteria about the number/distribution of samples to be collected for subsequent comprehensive studies and reinforce the valuable contribution of in situ gamma spectrometry to assess, in radiological terms, the prevalent geological features. |
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Authors:
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Pedro Duarte; António Mateus; Isabel Paiva; Romão Trindade; Pedro Santos |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine Volume: 69 ISSN: 1872-9800 ISO Abbreviation: Appl Radiat Isot Publication Date: 2011 Feb |
Date Detail:
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Created Date: 2010-12-27 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9306253 Medline TA: Appl Radiat Isot Country: England |
Other Details:
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Languages: eng Pagination: 463-74 Citation Subset: IM |
Copyright Information:
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Copyright © 2010 Elsevier Ltd. All rights reserved. |
Affiliation:
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Instituto Tecnológico e Nuclear, Unidade de Protecção e Segurança Radiológica, Estrada Nacional no10, Apartado 21, 2686-953 Sacavém, Portugal. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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