Now showing items 1-8 of 8

    • Centers responsible for the TL peaks of willemite mineral estimated by EPR analysis 

      Rao, T. K. Gundu; Cano, Nilo F. [UNIFESP]; Silva-Carrera, Betzabel N.; Ferreira, Reinaldo M.; Javier-Ccallata, Henry S.; Watanabe, Shigueo (Elsevier Science Bv, 2016)
      The mineral willemite (Zn2SiO4) exhibits five thermoluminescence (TL) peaks approximately at 160, 225, 260, 310 and 400 degrees C. Electron paramagnetic resonance (EPR) studies were carried out to study the defect centers ...
    • Dating and determination of firing temperature of ancient potteries from São Paulo II archaeological site, Brazil by TL and EPR techniques 

      Cano, Nilo Francisco [UNIFESP]; Ribeiro, Rogerio B.; Munita, Casimiro S.; Watanabe, Shigueo; Neves, Eduardo G.; Tamanaha, Eduardo K. (Elsevier B.V., 2015-05-01)
      Pottery fragments from São Paulo II (SPII) archaeological site were dated by means of thermoluminescence (TL) and electron paramagnetic resonance (EPR). EPR was used to study the firing temperature using the iron signal ...
    • Dating stalagmite from Caverna do Diabo (Devil'S Cave) by TL and EPR techniques 

      Watanabe, Shigueo; Cano, Nilo Francisco [UNIFESP]; Gundu Rao, T. K.; Silva-Carrera, Betzabel N.; Carmo, Lucas S.; Quina, Antonio J. A.; Gennari, Roseli F.; Munita, Casimiro S.; Ayala-Arenas, Jorge S.; Fernandes, Bruno G. (Acad Brasileira De Ciencias, 2016)
      A cylindrical fragment of stalagmite from Caverna do Diabo, State of Sao Paulo, Brazil, has been studied and dated by thermoluminescence and electron paramagnetic resonance techniques. The thermoluminescence glow curves ...
    • Effects of high-temperature annealing on ESR properties of solid solutions of garnet minerals 

      Rao, T. K. Gundu; Cano, Nilo Francisco [UNIFESP]; Chubaci, Jose F. D.; Watanabe, S. (Pergamon-Elsevier Science Ltd, 2016)
      A garnet (G7) silicate mineral belonging to pyralspite subgroup was studied using the technique of electron spin resonance (ESR). This study shows that iron is present in G7 as isolated species as well as species coupled ...
    • High- and very-high-dose dosimetry using silicate minerals 

      Watanabe, Shigueo; Cano, Nilo Francisco [UNIFESP]; Carmo, Lucas S.; Barbosa, Renata de Faria [UNIFESP]; Chubaci, Jose F. D. (Elsevier B.V., 2015-01-01)
      In the present study, certain natural silicate minerals such as aquamarine (AB), morganite (PB), goshenite (WB), white jadeite (JW), green jadeite (JG), pink tourmaline (PT) and two varieties of jadeite-like quartz, denoted ...
    • Spectroscopy of the gamma and X ray leakage radiation from the built-in sources of a Riso TL/OSL reader 

      Umisedo, Nancy K.; Kuenzel, Roseli [UNIFESP]; Okuno, Emico; Yoshimura, Elisabeth M.; Malthez, Anna Luiza M. C.; Freitas, Marcelo B. [UNIFESP] (Elsevier B.V., 2014-12-01)
      In this work we evaluate the intensity and the spectral shape of the leakage radiation from the built-in beta and alpha sources of a Riso TL/OSL reader. LiF (TLD-100), fluorite-based pellets and Al2O3:C detectors were used ...
    • Thermal precipitation of silver nanoparticles and thermoluminescence in tellurite glasses 

      Giehl, J. M.; Pontuschka, W. M.; Barbosa, L. C.; Chillcce, E. F.; Da Costa, Z. M.; Alves, S. [UNIFESP] (Elsevier B.V., 2011-10-01)
      Silver metal and/or oxide precipitation of nanoparticles in thermally treated Ag-doped tellurite glasses was studied by optical absorption (OA) and transmission electron microscopy (TEM). the Lorentzian adjusted silver ...
    • Thermoluminescence and optical absorption properties of glass from natural diopside and of synthetic diopside glass 

      Fernandes, Bruno G.; Cano, Nilo F. [UNIFESP]; Rao, T. K. Gundu; Gouvea, Douglas; Padilha, Angelo F.; Ayala-Arenas, Jorge S.; Watanabe, Shigueo (Elsevier Science Bv, 2017)
      Glasses based on natural mineral diopside and synthetic glasses starting from Oxides of magnesium, calcium and silicon, and some of these glasses doped with 0.1, 1.0, 2.0 and 4.0% of Ag, have been produced for the study ...