Study of neutron irradiation-induced colors in Brazilian topaz

A.S. Leal, K. Krambrock, L.G.M. Ribeiro, M.A.B.C. Menezes, Peter Vermaercke, Liesel Sneyers, Michel Bruggeman

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    In this work, preliminary results of the investigation of the coloring mechanisms in topaz from different regions of Brazil, irradiated by the TRIGA MARK I IPR-R1 and BR1 nuclear reactors of the CDTN/CNEN (Brazil) and SCK.CEN(Belgium), respectively, are presented . The samples were analyzed by the k0-NAA method for impurities and total activity. The color and color centers were investigated by optical absorption and electron paramagnetic resonance (EPR) spectroscopy. The total integrated flux dependence of the induced blue colors and color centers is discussed.

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