Evaluation of the maximum emitting layer of Rn-222 in cementitious building materials

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dc.contributor.authorCORREA, J.N.pt_BR
dc.contributor.authorPASCHUK, S.A.pt_BR
dc.contributor.authorBARRETO, R.C.pt_BR
dc.contributor.authorDENYAK, V.pt_BR
dc.contributor.authorSCHELIN, H.R.pt_BR
dc.contributor.authorNARLOCH, D.C.pt_BR
dc.contributor.authorDEL CLARO, F.pt_BR
dc.contributor.authorHASHIMOTO, Y.pt_BR
dc.contributor.authorMATIN, A.C.pt_BR
dc.contributor.authorSILVA, A.C.M.pt_BR
dc.contributor.authorZAHN, G.S.pt_BR
dc.contributor.authorSILVA, P.S.C.pt_BR
dc.coverageInternacionalpt_BR
dc.creator.eventoINTERNATIONAL CONFERENCE ON DOSIMETRY AND ITS APPLICATIONS, 3rdpt_BR
dc.date.accessioned2020-03-31T19:07:01Z
dc.date.available2020-03-31T19:07:01Z
dc.date.eventoMay 27-31, 2019pt_BR
dc.description.abstractIntroduction – Radionuclides present in construction materials are of interest in the view of environmental radioactivity. The limitations established have focused on the concentration of Ra-226 and the consequent exhalation of Rn-222. A physical/mathematical model developed at the Laboratory of Applied Nuclear Physics (LFNA/UTFPR) correlates the exhaled Rn-222 with the Ra-226 inherent to the material. The model considers the exhalation of Rn-222 by a plane surface that simulates exhalation in fl oors, walls and ceilings. Determination of the maximum emitting layer of Rn-222 that effectively exhales is important to support the model. The objective of this research is to determine the maximum emissive layer of Rn-222 that provides internal diffusion and exhalation of radon-222 in cementitious materials. Methods - Cylindrical samples were made of common cement paste and cement paste with sand of high Ra-226 concentration. The samples (thicknesses 1 to 5 cm) were sealed in order to ensure the exhalation of Rn-222 through one surface. Samples and diffusion chambers containing CR-39 solid-state detectors were inserted into a glass vessel. The samples/detectors were stored for 30 days. Subsequently, the detectors were chemically etched and the nuclear tracks in the CR-39 detectors were counted. Results – For each type of sample a curve was fi tted whose threshold indicated the maximum emitting layer. The results obtained on the samples of common cement paste indicated a maximum emitting layer of 2cm. For samples of cement paste with sand with high Ra-226 concentration, no threshold was observed, indicating that the maximum emitting layer is greater than 5cm. Conclusions - The maximum emitting layer thickness of Rn-222 of common materials determined by curve fi tting was 2cm. For materials with high concentration of Ra-226 there is an indication that the emitter layer is larger than 5cm. The obtained results subsidize the physical/mathematical model developed in the LFNA/UTFPR.pt_BR
dc.event.siglaICDApt_BR
dc.identifier.citationCORREA, J.N.; PASCHUK, S.A.; BARRETO, R.C.; DENYAK, V.; SCHELIN, H.R.; NARLOCH, D.C.; DEL CLARO, F.; HASHIMOTO, Y.; MATIN, A.C.; SILVA, A.C.M.; ZAHN, G.S.; SILVA, P.S.C. Evaluation of the maximum emitting layer of Rn-222 in cementitious building materials. In: INTERNATIONAL CONFERENCE ON DOSIMETRY AND ITS APPLICATIONS, 3rd, May 27-31, 2019, Lisboa, Portugal. <b>Abstract...</b> Lisboa, Portugal: C2TN, Instituto Superior Técnico, Universidade de Lisboa, 2019. Disponível em: http://repositorio.ipen.br/handle/123456789/31018.
dc.identifier.orcid0000-0003-3237-8588pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0002-9351-9201
dc.identifier.orcidhttps://orcid.org/0000-0003-3237-8588
dc.identifier.urihttp://repositorio.ipen.br/handle/123456789/31018
dc.localLisboa, Portugalpt_BR
dc.local.eventoLisboa, Portugalpt_BR
dc.publisherC2TN, Instituto Superior Técnico, Universidade de Lisboapt_BR
dc.rightsopenAccesspt_BR
dc.titleEvaluation of the maximum emitting layer of Rn-222 in cementitious building materialspt_BR
dc.typeResumo de eventos científicospt_BR
dspace.entity.typePublication
ipen.autorPAULO SERGIO CARDOSO DA SILVA
ipen.autorGUILHERME SOARES ZAHN
ipen.codigoautor2777
ipen.codigoautor950
ipen.contributor.ipenauthorPAULO SERGIO CARDOSO DA SILVA
ipen.contributor.ipenauthorGUILHERME SOARES ZAHN
ipen.date.recebimento20-03
ipen.event.datapadronizada2019pt_BR
ipen.identifier.ipendoc26813pt_BR
ipen.notas.internasAbstractpt_BR
ipen.type.genreResumo
relation.isAuthorOfPublicationaa898df6-ea14-482c-bc29-b45954bb0542
relation.isAuthorOfPublicationde99ffee-d830-4bea-aeeb-e8f3ccc34921
relation.isAuthorOfPublication.latestForDiscoveryde99ffee-d830-4bea-aeeb-e8f3ccc34921
sigepi.autor.atividadeSILVA, P.S.C.:2777:320:Npt_BR
sigepi.autor.atividadeZAHN, G.S.:950:310:Npt_BR
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