Durango apatite fission-track dating using length-based age corrections and neutron fluence measurements by natural thorium thin films and natural U-doped glasses calibrated through natural uranium thin films

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dc.contributor.authorIunes, P. J.
dc.contributor.authorHadler, J. C.
dc.contributor.authorBigazzi, G.
dc.contributor.authorTello, C. A.
dc.contributor.authorGuedes, S.
dc.contributor.authorPaulo, SR
dc.contributor.institutionCNR
dc.contributor.institutionUniversidade Estadual de Campinas (UNICAMP)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniv Fed Mato Grosso
dc.date.accessioned2014-05-20T15:24:09Z
dc.date.available2014-05-20T15:24:09Z
dc.date.issued2002-08-01
dc.description.abstractIn this work, we present an approach for neutron fluence measurements based on natural thorium thin films and natural uranium-doped glasses calibrated through natural uranium thin films to be used for dating with the Fission-Track Method (FTM). This neutron dosimetry approach allows the employment of FTM even when dating is carried out using low neutron themalization facilities. Besides, it makes possible the determination of the Th/U ratio of the mineral to be dated. Durango apatite which is often employed in FTM as an age standard was analyzed. This apatite presented a fairly high Th/U ratio, 29.9 +/- 1.7. Th fissions were 18%, 12% and 10% of the total for irradiations where thermal to fast neutron flux ratios were 2.4, 4.4 and 5,2, respectively. These results show that Th fission must be considered for this apatite, when not well-thermalized irradiation facilities are used. The ratio between spontaneous and induced track length, L(S)/L(1), close to 0.89, indicates a certain amount of rejuvenation of the age of Durango apatite. Therefore, its apparent age should be corrected, the application of a technique based on track-length measurements produced a corrected age of 29.7 +/- 1.1 Ma, consistent with the independent reference age of this apatite (31.4 +/- 0.5 Ma). This result represents a support for viability of the neutron dosimetry approach studied in this work for FTM.(C) 2002 Elsevier B.V. B.V. All rights reserved.en
dc.description.affiliationCNR, Ist Geocronol & Geochim Isotop, Area Ric, I-56124 Pisa, Italy
dc.description.affiliationUniv Estadual Campinas, UNICAMP, Inst Fis Gleb Wataghin, BR-13083970 Campinas, SP, Brazil
dc.description.affiliationUniv Estadual Paulist, UNESP, Inst Geociencias & Ciências Exatas, BR-13506900 Rio Claro, SP, Brazil
dc.description.affiliationUniv Fed Mato Grosso, UFMT, Inst Ciências Exatas & Terra, Dept Fis, BR-78060900 Cuiaba, MT, Brazil
dc.description.affiliationUnespUniv Estadual Paulist, UNESP, Inst Geociencias & Ciências Exatas, BR-13506900 Rio Claro, SP, Brazil
dc.format.extent201-211
dc.identifierhttp://dx.doi.org/10.1016/S0009-2541(02)00045-1
dc.identifier.citationChemical Geology. Amsterdam: Elsevier B.V., v. 187, n. 3-4, p. 201-211, 2002.
dc.identifier.doi10.1016/S0009-2541(02)00045-1
dc.identifier.issn0009-2541
dc.identifier.urihttp://hdl.handle.net/11449/34812
dc.identifier.wosWOS:000177462500002
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofChemical Geology
dc.relation.ispartofjcr3.570
dc.relation.ispartofsjr1,755
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjecturanium thin filmpt
dc.subjectthorium thin filmpt
dc.subjectneutron dosimetrypt
dc.subjectfission-track datingpt
dc.subjectDurango apatitept
dc.titleDurango apatite fission-track dating using length-based age corrections and neutron fluence measurements by natural thorium thin films and natural U-doped glasses calibrated through natural uranium thin filmsen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.
unesp.author.lattes5982597921345094[4]
unesp.author.orcid0000-0002-0369-8999[4]

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