Dose de exposição radiométrica de granitos do estado de Rondônia, Brasil
| Autor: | Ene Glória da Silveira, Daniel Marcos Bonotto, Jorge Silva Bettencourt, Washington Barbosa Leite Junior, B. L. Payolla |
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| Přispěvatelé: | Universidade Estadual Paulista (Unesp), ELETRONORTE, Universidade de São Paulo (USP), UNIR |
| Jazyk: | portugalština |
| Rok vydání: | 2009 |
| Předmět: |
concentration (composition)
mineral potassium granitos Analytical chemistry pollution exposure Mineralogy radioatividade rock Granites gamma ray radiation dose-response relationship GRANITO Geophysics Geography Radioactivity statistical analysis Activity concentration Gamma exposure rate Statistical analysis dose de exposição gama Absorbed dose rate granite |
| Zdroj: | Scopus Repositório Institucional da UNESP Universidade Estadual Paulista (UNESP) instacron:UNESP Revista Brasileira de Geofísica v.27 n.3 2009 Revista Brasileira de Geofísica Sociedade Brasileira de Geofísica (SBG) instacron:SBG Revista Brasileira de Geofísica, Volume: 27, Issue: 3, Pages: 333-348, Published: SEP 2009 Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP |
| Popis: | Submitted by Vitor Silverio Rodrigues (vitorsrodrigues@reitoria.unesp.br) on 2014-05-27T11:23:55Z No. of bitstreams: 0Bitstream added on 2014-05-27T14:30:21Z : No. of bitstreams: 1 2-s2.0-77953785683.pdf: 361449 bytes, checksum: a439215c07c944b4d6a222a86be4d141 (MD5) Made available in DSpace on 2014-05-27T11:23:55Z (GMT). No. of bitstreams: 0 Previous issue date: 2009-07-01 This work evaluated the activity concentration of the radioelements K, eU and eTh in samples of granites from Rondônia State, Brazil. The statistical analysis of the data indicated that they fit lognormal distributions. The modal values correspond to about 11% for K, 29 ppm for eU and 85 ppm for eTh. Directsignificant correlations were found among the concentrations of the three radioelements, i.e. r = 0.71 (between K and eU), r = 0.72 (between K and eTh), andr = 0.72 (between eU and eTh), suggesting congruency of their accumulation in minerals occurring in the rocks analyzed. The activity concentration data allowed estimate the absorbed dose rate in air at 1 m above the ground, which also fits a lognormal distribution characterized by a mode of 2.7 mSv/y that is slightly higher than the average worldwide exposure of 2.4 mSv/y. The results obtained also allowed evaluate if the granites analyzed are radiometrically suitable as building and ornamental materials. © 2009 Sociedade Brasileira de Geofísica. Instituto de Geociências e Ciências Exatas (IGCE)/UNESP/Rio Claro, Avenida 24-A, 1515, Cx. Postal 178, Bela Vista, 13506-900 Rio Claro, SP Centrais Elétricas do Norte do Brasil S.A. ELETRONORTE, SCN Quadra 6, Edifício Venâncio 3000, 70718-900 Brasília, DF Instituto de Geociências (IG) USP, Rua do Lago, 562, Cidade Universitária, 05508-080 São Paulo, SP Fundação Universidade Federal de Rondônia UNIR, Avenida Presidente Dutra, 2965, Centro, 78900-500 Porto Velho, RO Instituto de Geociências e Ciências Exatas (IGCE)/UNESP/Rio Claro, Avenida 24-A, 1515, Cx. Postal 178, Bela Vista, 13506-900 Rio Claro, SP |
| Databáze: | OpenAIRE |
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