Navegando por Autor "Silva, E. S. S."

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    CdWO4-on-MEH-PPV:PS as a candidate for real-time dosimeters.
    (2012) Silva, M. M.; Novais, S. M. V.; Silva, E. S. S.; Schimitberger, Thiago; Macedo, Z. S.; Bianchi, Rodrigo Fernando
    We report on the investigations about the modification of optical properties induced by X-rays onto film detectors of cadmium tungstate (CdWO4), poly[2-methoxy-5(20 -ethylhexyloxy)-p-phenylenevinylene] (MEH-PPV) and polystyrene (PS) This device takes advantage of reduction of spectral overlap between the radioluminescence (RL) of CdWO4 and the absorption of MEH-PPV as it is exposed to radiation, forming the basis of a new dosimeter that is capable of converting the orange-red radioluminescence of PS:MEH-PPV:CdWO4 into green. We propose an explanation of the optical processes occurring in MEHPPV:CdWO4 in terms of the radiation hardness of CdWO4 combined to the RL-induced degradation of MEH-PPV.