Browsing by Subject "RAYOS X"

Now showing items 1-7 of 7

    • A combined experimental and theoretical study of gas sorption on nanoporous silver triazolato metal-organic frameworks 

      Yang, Guang; Santana, Juan A; Rivera Ramos, Milton E.; García - Ricard, Omar; Saavedra-Arias, José; Ishikawa, Yasuyuki; Hernandez-Maldonado, Arturo; Raptis, Raphael G. (2014-01-01)
      A new silver-triazolate metal-organic framework (MOF), {Ag 3[Ag5(μ3-3,5-tBu 2tz)6](BF4)2}n (2), has been prepared and structurally characterized. The CO2 sorption properties of this new MOF and previously reported isostructural ...

    • Analytical and rheological studies of modified gel dosimeters exposed to X-ray beams 

      Romero, Marcelo Ricardo; Mattea, Facundo; Vedelago, José; Chacón Obando, David M; Valente, Mariana A.; Alvarez, Cecilia; Strumia, Miriam Cristina (Elsevier Science, 2016-07)
      The need to know the dose of X-rays to be applied to patients suffering diseases such as cancer requires accurate and stable dosimetric devices. Currently, the use of gelatin-based dosimeters has yielded excellent results ...

    • Characterization of the VARIAN®PaxScan 2020+ flat panel detector for quantitative X-ray imaging 

      Geser, Federico Alejandro; Chacón, David; Figueroa, R.; Malano, F.; Santibañez, M.; Valente, M. (X-Ray Spectrometry vol.45 no.3 169-175 2016, 2016-02-19)
      In this work, the response of the VARIAN® PaxScan 2020+ flat panel detector was characterized in terms of spatial resolution and uniformity across the detection area along with detection efficiency for photon beams from ...

    • Feasibility of dose enhancement assessment: preliminary results by means of Gd-infused polymer gel dosimeter and Monte Carlo study 

      Santibáñez, M.; Guillen, Y.; Chacón Obando, David M; Figueroa, R.G.; Valente, M. (Universidad Nacional (Costa Rica), 2018)
      This work reports the experimental development of an integral Gd-infused dosimeter suitable for Gd dose enhancement assessment along with Monte Carlo simulations applied to determine the dose enhancement by radioactive ...

    • Influence of substrate temperature on phase formation in Al-Cr thin films 

      Saenz, A.; Chavarri, D.; Hernandez, R.; Castaño, V.M. (Universidad Nacional, Costa Rica, 2000)
      Thin films (of the order of nm) of Al-Cr alloys were prepared by successive depositions by an electron gun in a vacuum chamber. Three Al and two Cr layers, of thicknesses as to yield the final composition, were de posited ...

    • Polymer gel dosimeter based on itaconic acid 

      Mattea, Facundo; Chacón, David; Vedelago, José; Valente, Mauro; Strumia, Miriam (2015-11)
      A new polymeric dosimeter based on itaconic acid and N, N'-methylenebisacrylamide was studied. The preparation method, compositions of monomer and crosslinking agent and the presence of oxygen in the dosimetric system were ...

    • La radiación de frenado en campos magnéticos fuertes 

      Semionova N., L; Páez, Jorge (Universidad Nacional [Costa Rica], 1989-01-01)
      Presentamos un análisis de las funciones de transición de Bremsstrahlung en función de la polarización de espín total del electrón a lo largo del campo magnético externo y la polarización lineal o circular de la radiación ...