The radiation-induced UV-vis spectrum of α-terthiophene radical cation in solid is reported. The radical cation initiates an oligomerization in the CTA matrix producing permanently coloured conjugated polarons. The specific net absorbance at 465nm is linearly related with dose up to 2×106Gy, for electrons and gamma irradiation. The decrease of the UV typical absorption (355nm) and of four IR bands of α-terthiophene is linear with dose, as well. Although sensitivity is influenced by dose rate, it turned out that a linear relationship holds between sensitivity and log dose rate, in the range from 2 to 105Gy/min. These findings suggest a potential application of the system for dosimetric purposes over a wide range of dose and dose rate. © 2001 Elsevier Science Ltd. All rights reserved.
Emmi, S.S., Takacs, E., Ceroni, P., D'Angelantonio, M., Lavalle, M., Fuochi, P.G., et al. (2002). Formation of radical cations and dose response of α-terthiophene-cellulose triacetate films irradiated by electrons and gamma rays. RADIATION PHYSICS AND CHEMISTRY, 63(1), 53-58 [10.1016/S0969-806X(01)00481-9].
Formation of radical cations and dose response of α-terthiophene-cellulose triacetate films irradiated by electrons and gamma rays
Ceroni P.;
2002
Abstract
The radiation-induced UV-vis spectrum of α-terthiophene radical cation in solid is reported. The radical cation initiates an oligomerization in the CTA matrix producing permanently coloured conjugated polarons. The specific net absorbance at 465nm is linearly related with dose up to 2×106Gy, for electrons and gamma irradiation. The decrease of the UV typical absorption (355nm) and of four IR bands of α-terthiophene is linear with dose, as well. Although sensitivity is influenced by dose rate, it turned out that a linear relationship holds between sensitivity and log dose rate, in the range from 2 to 105Gy/min. These findings suggest a potential application of the system for dosimetric purposes over a wide range of dose and dose rate. © 2001 Elsevier Science Ltd. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
