Experimental device to measure the electrical and optical properties of radiochromic films as a function of temperature.
In the last decade, radiochromic films (RCF) have been used extensively in medical physics for evaluating uniformity of radiation beams and dose distributions. These films are very sensitive to changes in temperature; therefore, one needs to know its thermal behavior to use them efficiently. Normally, the thermal assessment is done using optical methods on previously irradiated samples. Here, we report the use of a complementary dielectric method. We designed an experimental device that allows us to measure, simultaneously, the dielectric and optical properties as a function of temperature. We performed the measurements in real-time to temperature increases from 27 to 48 degrees C of EBT and MD-55 RCF previously exposed to UV. We found for both films a decrease in the real part of the dielectric permittivity as the temperature increases, but an increment and decrease in the dielectric loss factor for the EBT and MD-55 film, respectively.
Gómez-Galván
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Cinvestav-Monterrey, Via del Conocimiento 201, PIIT, Autopista al Aeropuerto, Km. 9.5, Apodaca, Nuevo Leon 66600, Mexico.
Mercado-Uribe
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D025802:Electric Capacitance; D004560:Electricity; D004867:Equipment Design; D004864:Equipment and Supplies; D005373:Film Dosimetry / Q000295:instrumentation*; D055095:Optics and Photonics; D013057:Spectrum Analysis; D013696:Temperature; D013997:Time Factors; D014466:Ultraviolet Rays