Now showing items 1-10 of 10

    • Efeitos da dopagem com prata na luminescência de matrizes vítreas de borato de magnésio para aplicação em dosimetria de radiações ionizantes 

      Duque, Isadora Augusta Machado [UNIFESP] (Universidade Federal de São Paulo, 2022-05-30)
      Neste trabalho são estudadas as propriedades dosimétricas dos vidros de borato de magnésio puro e dopado com prata, através dos métodos da Termoluminescência (TL), da Luminescência Opticamente Estimulada (LOE) e da Ressonância ...

    • Isothermal annealing of a 620 nm optical absorption band in Brazilian topaz crystals 

      Isotani, Sadao; Matsuoka, Masao; Albuquerque, Antonio Roberto Pereira Leite [UNIFESP] (Elsevier B.V., 2013-04-15)
      Isothermal decay behaviors, observed at 515, 523, 562, and 693 K, for an optical absorption band at 620 nm in gamma-irradiated Brazilian blue topaz were analyzed using a kinetic model consisting of O- bound small polarons ...

    • LiAlO2 with nanocrystals of Al2Tb4O9 / Tb(AlO3) synthesized by sol-gel technique for TL and OSL applications 

      Ventieri, Alexandre; Mittani, Juan Carlos Ramirez [UNIFESP]; Rocca, René Rojas [UNIFESP]; Goncalves, Katia Alessandra; Tatumi, Sonia Hatsue [UNIFESP] (Pergamon-Elsevier Science Ltd, 2017)
      Using a sol-gel route, powder samples of gamma-LiAklO(2) and doped with Tb were synthesized successfully. Xray diffraction (XRD) results demonstrated that doped samples were composed of two phases Al2Tb4O9 and Tb(AlO3), ...

    • Síntese e estudo de ca2al2sio7 dopado com terras raras e sua possível aplicação na dosimetria por termoluminescência 

      Fiorini, Giovanni Gatti [UNIFESP] (Universidade Federal de São Paulo, 2022-11-14)
      Este trabalho tem como objetivo sintetizar o cristal Ca2Al2SiO7 dopado com terras raras pelo método de reação do estado sólido e realizar o estudo das propriedades termoluminescentes, a fim de analisar uma possível ...

    • Studies of Radiation-Induced Defects in Li2SiO3:Sm Phosphor Material 

      Singh, N.; Singh, Vijay; Watanabe, Shigueo; Rao, T. K. Gundu; Chubaci, Jose Fernando Diniz; Cano, Nilo Francisco [UNIFESP]; Pathak, M. S.; Singh, Pramod K.; Dhoble, S. J. (Springer, 2017)
      Li2SiO3:Sm was synthesized by the solution combustion method. Powder x-ray diffraction technique was used to find the phase formation. Li2SiO3:Sm exhibits thermoluminescence (TL) peaks at approximately 140 degrees C, 155 ...

    • Study of luminescence, color and paramagnetic centers properties of albite 

      Cano, Nilo Francisco [UNIFESP]; Santos, Lara Helena Elerbrock dos; Chubaci, Jose Fernando Diniz; Watanabe, Shigueo (Elsevier B.V., 2015-02-25)
      A sample of natural albite, NaAlSi3O8, from the state of Minas Gerais, Brazil, has been investigated. the mineral is a solid solution of K-feldspar (4600 ppm - K) and Ca-feldspar (1100 ppm - Ca). the TL spectra of natural ...

    • Termoluminescência e luminescência opticamente estimulada da calcita natural amarela 

      Guilheiro, Joice Marques [UNIFESP] (Universidade Federal de São Paulo, 2022-06-29)
      Objetivos: Caracterização da estrutura cristalina da amostra de calcita, com a finalidade de possível uso na dosimetria ambiental e datação geológica. Métodos: Para caracterizar a estrutura cristalina do mineral, foram ...

    • Thermo luminescence and optically stimulated luminescence characteristics of Al2O3 doped with Tb 

      Soares, J. V.; Gugliotti, C. F.; Kawashima, Y. S.; Tatumi, Sonia Hatsue [UNIFESP]; Mittani, Juan Carlos Ramirez [UNIFESP] (Elsevier B.V., 2014-12-01)
      In the present work policrystals of alpha - Al2O3 doped with terbium were synthesized using the solvent evaporation method. the samples were prepared using Al(NO3)(3)center dot 9H(2)O and Tb(NO3)(3).5H(2)O reagents, with ...

    • Thermo luminescence in two varieties of jadeite: Irradiation effects and application to high dose dosimetry 

      Barbosa, Renata de Faria [UNIFESP]; Cano, Nilo Francisco [UNIFESP]; Watanabe, Shigueo; Guttler, Rainer A. S.; Reichmann, Fernando (Elsevier B.V., 2014-12-01)
      The thermoluminescence properties of white (WJ) and green (GJ) mineral jadeite have been investigated with a view to be of use in high dose dosimetry. WJ presented glow curve with 110,190 and 235 degrees C peaks. All these ...

    • Thermoluminescence features of MgB4O7:Tb phosphor 

      Kawashima, Yasmin Sayuri; Gugliotti, Caroline Ferreira; Yee, Márcio; Tatumi, Sonia Hatsue [UNIFESP]; Mittani, Juan Carlos Ramirez (Elsevier B.V., 2014-02-01)
      In the present work, polycrystalline samples of MgB4O7 doped with terbium at different concentrations were synthesized using the solvent evaporation method. the sample doped with 1 mol% of Tb presented the highest luminescence ...