Please use this identifier to cite or link to this item: http://hdl.handle.net/1822/50792

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dc.contributor.authorDias, Fláviopor
dc.contributor.authorLima, Marcopor
dc.contributor.authorSanjurjo-Sánchez, Jorgepor
dc.contributor.authorAlves, C.por
dc.date.accessioned2018-02-21T14:41:48Z-
dc.date.issued2016-
dc.identifier.issn0265-931Xpor
dc.identifier.urihttp://hdl.handle.net/1822/50792-
dc.description.abstractGeological characteristics can have impacts on societal development by, e.g., geotechnical issues and radiological hazard levels. Due to urban sprawl, there is an increasing need for detailed geological assessment. In this work are analysed data from portable handheld gamma-ray spectra (K, eU and eTh) obtained in granitic and Silurian metaclastic outcrops as well as in an profile, roughly N-S, o n soil covered terrains transecting a mapped contact between these rock types (the profile's northern extremity is at locations mapped as granite). Estimations from gamma-ray spectra were studied by univariate and multivariate analyses. K, eU and eTh values were higher on granite in relation to Silurian metaclastic rocks. The northern extremity of the profile showed clearly higher contents of eTh and this contrast was supported by univariate statistical tools (normality plot and Wilk-Shapiro test; boxplots). A ternary plot with the contribution of the elements to gamma-ray absorbed dose showed the separation of granite from Silurian metaclastic rocks with the former being nearer the eTh vertex. The points in the northern extremity of the profile are nearer the eTh vertex than the other points on the profile. These visual suggestions were supported by hierarchical cluster analysis, which was able to differentiate between granite and metaclastic outcrops and separate portions of the profile located on different terrains. Portable gamma-ray spectrometry showed, hence, the potential to distinguish granite and metaclastic terrains at a scale useful for engineering works. These results can also be useful for a first comparative zoning of radiological hazards (which are higher for granite).por
dc.description.sponsorshipThe Lab2PT, Landscape, Heritage and Territory Laboratory (UID/AUR/04509/2013) and the Centre of Geological Research, Management and Valorisation of Resources (CIG-R; PEst-OE/CTE/UI0697/2011; PEst-OE/CTE/UI0697/2014) had been supported by the FCT - Fundacao para a Ciencia e Tecnologia (Portugal), with Portuguese funds and funds from the European Union (FEDER, "Programa Operacional Factores de Competitividade" - COMPETE, POCI-01-0145-FEDER-007528).The University Institute of Geology of the University of A Coruna (Spain) receive support from the Xunta de Galicia with funds from "Consolidacion y estructuracion de unidades de investigacion competitivas - Modelo Grupo de potencial de crecimiento (CN 2012/189)".por
dc.language.isoengpor
dc.publisherElsevier Ltdpor
dc.relationinfo:eu-repo/grantAgreement/FCT/5876/147320/PTpor
dc.relationPEst-OE/CTE/UI0697/2011por
dc.relationinfo:eu-repo/grantAgreement/FCT/5876/135912/PTpor
dc.rightsrestrictedAccesspor
dc.subjectNatural radioactivitypor
dc.subjectGeological hazardspor
dc.subjectSite investigationpor
dc.subjectGranite rockspor
dc.subjectMetaclastic rockspor
dc.titleAnalysis of spectra from portable handheld gamma-ray spectrometry for terrain comparative assessmentpor
dc.typearticle-
dc.peerreviewedyespor
dc.relation.publisherversionhttps://www.sciencedirect.com/science/article/pii/S0265931X16300170por
oaire.citationStartPage93por
oaire.citationEndPage100por
oaire.citationTitleJournal of Environmental Radioactivitypor
oaire.citationVolume154por
dc.identifier.doi10.1016/j.jenvrad.2016.01.017por
dc.identifier.pmid26867098por
dc.description.publicationversioninfo:eu-repo/semantics/publishedVersionpor
dc.subject.wosScience & Technologypor
sdum.journalJournal of Environmental Radioactivitypor
Appears in Collections:CIG-R - Artigos (Papers)

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