CARLOS HENRIQUE DE MESQUITA
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Artigo IPEN-doc 23998 Influence of impurities on the radiation response of the TlBr semiconductor crystal2017 - SANTOS, ROBINSON A. dos; MESQUITA, CARLOS H. de; SILVA, JULIO B.R. da; FERRAZ, CAUE de M.; COSTA, FABIO E. da; MARTINS, JOAO F.T.; GENNARI, ROSELI F.; HAMADA, MARGARIDA M.Two commercially available TlBr salts were used as the rawmaterial for crystal growths to be used as radiation detectors. Previously, TlBr salts were purified once, twice, and three times by the repeated Bridgmanmethod. Thepurification efficiency was evaluated by inductively coupled plasma mass spectroscopy (ICP-MS), after each purification process. A compartmental model was proposed to fit the impurity concentration as a function of the repetition number of the Bridgman growths, as well as determine the segregation coefficients of impurities in the crystals. The crystalline structure, the stoichiometry, and the surface morphology of the crystals were evaluated, systematically, for the crystals grown with different purification numbers. To evaluate the crystal as a radiation semiconductor detector, measurements of its resistivity and gamma-ray spectroscopy were carried out, using 241Am and 133Ba sources. A significant improvement of the radiation response was observed in function of the crystal purity.Artigo IPEN-doc 19405 Influence of impurities on the surface morphology of the TlBr crystal semiconductor2013 - SANTOS, ROBINSON A. dos; SILVA, JULIO B.R. da; MARTINS, JOAO F.T.; FERRAZ, CAUE de M.; COSTA, FABIO E. da; GENNARI, ROSELI F.; MESQUITA, CARLOS H. de; HAMADA, MARGARIDA M.Artigo IPEN-doc 17188 Multielementar segregation analysis of the thallium bromide impurities purified by repeated bridgman technique2011 - SANTOS, ROBINSON A. dos; COSTA, FABIO E. da; GENNARI, ROSELI F.; MARTINS, JOAO F.T.; MARCONDES, RENATA M.; MESQUITA, CARLOS H. de; HAMADA, MARGARIDA M.Artigo IPEN-doc 14650 Temperature dependence in the long-term stability of the TlBr detector2009 - COSTA, FABIO E. da; MESQUITA, CARLOS H. de; HAMADA, MARGARIDA M.Artigo IPEN-doc 18307 A comparative study on the performance of radiation detectors from the HgIsub(2) crystals grown by different techniques2012 - MARTINS, JOAO F.T.; COSTA, FABIO E.; SANTOS, ROBINSON A. dos; MESQUITA, CARLOS H. de; HAMADA, MARGARIDA M.