Low dose ionizing radiation detection using conjugated polymers

Silva, E. A. B.; Borin, J. F.; Nicolucci, P.; Graeff, C. F. O.; Netto, T. Ghilardi; Bianchi, R. F.
March 2005
Applied Physics Letters;3/28/2005, Vol. 86 Issue 13, p131902
Academic Journal
In this work, the effect of gamma radiation on the optical properties of poly[2-methoxy-5-(2′-ethylhexyloxy)-p-phenylenevinylene] (MEH-PPV) is studied. The samples were irradiated at room temperature with different doses from 0 Gy to 152 Gy using a 60Co gamma ray source. For thin films, significant changes in the UV-visible spectra were only observed at high doses (>1 kGy). In solution, shifts in absorption peaks are observed at low doses (<10 Gy), linearly dependent on dose. The shifts are explained by conjugation reduction, and possible causes are discussed. Our results indicate that MEH-PPV solution can be used as a dosimeter adequate for medical applications.


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