Unsupervised pattern-recognition and radiological risk assessment applied to the evaluation of behavior of rare earth elements, Th, and U in monazite sand

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Author(s):	Wyatt, Nathalia Luiza P. ; Costa, Vinicius C. ; de Souza, Jefferson R. ; Ferde, Merisnet ; Costa, Floriatan S. ; Neris, Jordan B. ; Brandao, Geisamanda P. ; Guedes, Wesley N. ; Carneiro, Maria Tereza W. D. Total Authors: 9
Document type:	Journal article
Source:	Environmental Science and Pollution Research; v. N/A, p. 9-pg., 2022-06-28.
Abstract
The Brazilian coast is rich in monazite which is found in beach sand deposits. In this study, the composition of the monazite sands from beaches of State of Espirito Santo, Brazil, was investigated. The concentrations of rare earth elements (REEs), Th, and U were determined by inductively coupled plasma mass spectrometry (ICP-MS). In the studied region, the mean concentration of investigated elements increased in the following order: Tm < Yb < Ho < Lu < Eu < Er < Tb < Dy < U < Y < Th < Gd < Sm < Pr < Nd < La < Ce. The sampling sites were classified into three clusters and discriminated by the concentrations of REEs, Th, and U found. In general, the radiological risk indices were higher than the established limits, and the risk of developing cancer was estimated to be higher than the world average. (AU)

FAPESP's process:	21/01187-3 - Evaluation of different calibration strategies in Laser-Induced Breakdown Spectroscopy (LIBS) for the determination of carbon, macro and micronutrients in soil samples
Grantee:	Vinicius Câmara Costa
Support Opportunities:	Scholarships in Brazil - Post-Doctoral