Título:	Baseline and quality reference values for natural radionuclides in soils of Rio de Janeiro State, Brazil.
Autoria:	RIBEIRO, F. C. A. LAURIA, D. da C. SILVA, J. I. R. LIMA, E. S. A. AMARAL SOBRINHO, N. M. B. do PEREZ, D. V.
Afiliação:	FERNANDO CARLOS ARAUJO RIBEIRO, INSTITUTO DE RADIOPROTEÇÃO E DOSIMETRIA-RJ; DEJANIRA DA COSTA LAURIA, INSTITUTO DE RADIOPROTEÇÃO E DOSIMETRIA-RJ; JOSÉ IVAN RODRIGUES SILVA, INSTITUTO DE RADIOPROTEÇÃO E DOSIMETRIA-RJ; ERICA SOUTO ABREU LIMA, UFRRJ; NELSON MOURA BRASIL DO AMARAL SOBRINHO, UFRRJ; DANIEL VIDAL PEREZ, CNPS.
Ano de publicação:	2018
Referência:	Revista Brasileira de Ciência do Solo, v. 42, article e0170146, 2018.
Conteúdo:	A first large-scale systematic survey of natural radioactivity contents of soils of the state of Rio de Janeiro is presented, focused on the establishment of Quality Reference Values (QRVs). Undisturbed soil samples were collected from 243 areas and analyzed by gamma spectrometry. The activity contents varied largely, ranging from 12.2 to 1,029 Bq kg-1 for 40K (geometric mean of 111.1 Bq kg-1), from 3.5 to 99.8 Bq kg-1 for 226Ra (geometric mean of 29.7 Bq kg-1), and from 5.4 to 314.5 Bq kg-1 for 228Ra (geometric mean of 67.1 Bq kg-1). The highest contents of radium isotopes were found in soils developed on igneous rocks (Leptosol), and the lowest in a soil of sedimentary origin (Podzol). Among the different soil types, the radioisotope contents differed substantially. Separate QRVs were calculated for each radionuclide by the 75th and 90th percentile approach, and the QRVs were estimated for each soil type. The results emphasized the restrictiveness of QRVs based on the 75th percentile or of a single overall QRV for all soils. Therefore, rather than estimating a separate QRV for each radionuclide for the State, we suggest the use of an upper threshold value, defined as the 90th percentile, and a specific QRV for each soil type area.
Thesagro:	Rádio Potássio Solo
NAL Thesaurus:	Radium Potassium Soil
Palavras-chave:	Valores de referência de qualidade
Digital Object Identifier:	https://doi.org/10.1590/18069657rbcs20170146
Tipo do material:	Artigo de periódico
Acesso:	openAccess
Aparece nas coleções:	Artigo em periódico indexado (CNPS)