ABSTRACT Irradiation effects of γ-radiation on the physical and electrical properties of polycarbonate (Makrofol-E( film has been studied to be able to investigate the dielectric response of irradiated polymers for a wide range of fluence and frequency. The dielectric constant (ε') The loss tangent (tanδ), dielectric loss factor (ε''), the a.c electrical conductivity (σ) and the relaxation time (τ), were measured in the frequency range from (40) Hz to (4) MHz. These samples were irradiated by means of γ-rays from 10 up to 200 KGy. The change in different properties as a function of absorbed dose was studied. Degradation of the polymers leading to amorphisation was observed by increasing the absorbed γ- dose. The induced changes in the electrical conductivity due to γ-rays irradiation of Makrofol-E provide a better method for γ -dose measurements. A semi-empirical equation was developed to use Makrofol-E as a dielectric dosimeter. Furthermore, Makrofol-E has much greater resistance to radiation damage; the attained results suggested strongly the applicability of Makrofol-E to be used in medical products applications.
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Fares, S. (2011) Frequency dependence of the electrical conductivity and dielectric constants of polycarbonate (Makrofol-E) film under the effects of γ-radiation. Natural Science, 3, 1034-1039. doi: 10.4236/ns.2011.312129.
 Zahran, A.H., Ibrahim, E.M., Ezz-Eldin, F.M. and El-Assy, N.B. (1981) Electrical behaviour of γ-irradiated rigid and soft poly (vinyl chloride). The International Journal of Applied Radiation and Isotopes, 32, 713-717. doi:10.1016/0020-708X(81)90019-3
 Kumar, R., Virk, H.S, Verma, K.C., Saha, A. and Prasad, U.De.R. (2006) Physico-chemical modifications induced in Makrofol N-polycarbonate by swift heavy ions. Nuclear Instruments and methods in Physics Research B, 251, 163-166. doi:10.1016/j.nimb.2006.06.003
 Sinha, D., Sahoo, K.L, Sinha, U.B, Chemseddine, A., Swu, T. and Fink, D. (2004) Gamma induced modifications of polycarbonate polymer. Radiation Effects & Defects in Solids, 9, 587-595.
 Cheng, S. and Kerluke, D.R. (2003) Radiation processing for modification of polymers. 2003 Annual Technical Conference of the Society of Plastic Engineering (ANTEC) IBA, Advanced Materials Division, 7695 Formula Place, San Diego.
 Chung, J.Y.J. (1997) Stabilization of Gamma-Irradiated Polycarbonate. Medical Plastics and Biomaterials. Technical Paper Series, 49.
 Buford Price, P. (2008) Recent applications of nuclear tracks in solids. Radiation Measurements, 43, S13-S25.
 Nouh, S.A., Morsy, A.A. and EL-Husseniy, H.M. (2004) Radiation-induced changes in some SSNTDs. Radiation Effects & Defects in Solids, 159, 115-124.
 Kecskemeti, G., Smausz, T., Kresz, N., Toth, Z., Hopp, B., Chrisey, D. and Berkesi, O. (2006) Pulsed laser deposition of polyhydroxybutrate biodegradable polymer thin films using ArF excimer laser. Applied Surface Science, 253, 1185-1189. doi:10.1016/j.apsusc.2006.01.084
 Basha, A.M., Ahmed, M.A, Marey, H.Kh. and Hanafy, T. A. (1996) Neutron dosimetry measurement. Indian Journal of Physics, 70A, 619-625.
 Ahmed, M.A., Basha, A.M., Marey, H.K. and Hanafy, T.A. (2001) Effect of neutrons and γ radiation on cobalt-gelatin Film. Journal of Applied Polymer Science, 79, 1749-1755.
 Hanafy, T.A., (2008) Drastic effect of fast neutrons and γ radiation on the dc-conductivity of Co-, Ni-, Mn-, and Aggelatin doped film. Current Applied Physics, 8, 527- 534. doi:10.1016/j.cap.2007.09.002
 Boiteuxa, G., Chailan, J.F., Chaucharda, J. and Seytrea, G. (1997) Dielectric and mechanical spectroscopes for the study of thermal and radiochemical ageing of polymers. Dielectric and mechanical spectroscopes for the study of thermal and radiochemical ageing of polymers, 131, 172-179. doi:10.1016/S0168-583X(97)00198-5
 Esther Martínez-Pardo, Ma., Cardoso, J., Vázquez, H. and Aguilar, M. (1998) Characterization of MeV proton irradiated PS and LDPE thin films. Nuclear Instruments and Methods in Physics Research Section B, 140, 325- 340. doi:10.1016/S0168-583X(98)00013-5
 Phukan, T., Kanjilal, D., Goswami, T. D. and Beam, H. L. (1999) Interactions with Materials and Atoms. Nuclear Instruments and Methods in Physics Research Section B, 155, 116-119. doi:10.1016/S0168-583X(99)00255-4
 Yoshida, Y., Nishimatsu, N., Mukai, S., Kashiwazaki, T. and Yasufuku, S. (1980) Evolution of Power Capacitors as a Result of New Material Development. CIGRE Report, 15-01.
 Kita, H., Okamoto, K. and Sakamoto, I. (1986) Physical and dielectric properties of irradiated polypropylene and poly (ethylene terephthalate). International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry, 28, 393-397.
 Information Sources Include Polymer Manufacturers Data (1988) NASA/Jet Propulsion Laboratories.
 Skeins and Williams (1992) “Ionizing Radiation Effect on Selected Biomedical Polymers”; Kiang, “Effect of Gamma Irradiation on Elastomeric Closures,” Technical Report, 16, PDA.
 Kumar, R., Asad Ali, S., De, U., Avasthi, D. K. and Prasad, R. (2009) Dielectric response of makrofol-KG polycarbonate irradiated with 145 MeV Ne6+ and 100 MeV Si8+ ions. Indian Journal of Physics, 83, 963-968.
 Abul-Hail, R.Ch. (2010) Optical absorption of polycarbonate (Makrofol E) as means of Gamma-ray Dosimetry. Journal of Basrah Researches (Sciences), 36, 26-30.
 Elliott, S.R. (1087) A.c. conduction in amorphous chalcogenide and pnictide semiconductors. Advances in Physics, 36, 135-217. doi:10.1080/00018738700101971
 Bhatnagar, V.K. and Bhatia, K.L. (1990) Frequency dependent electrical transport in bismuth-modified amorphous germanium sulfide semiconductors. Journal of Non-Crystalline Solids, 119, 214-231.
 Fawzy, Y.H. (2002) Study on spectroscopic determination and electrical properties of rare earth minerals. Ph.D thesis, Faculty of Girls, Ain Shams University, Cairo, Egypt.
 Pethig, R. (1979) Dielectric and Electronic Properties of Biological Materials. Wiley, New York, 15-18.
 Wintersgill, M.C. and Fontanella, J.J. (1998) Complex impedance measurements on Nafion, Electrochimica Acta, 43, 1533-1538. doi:10.1016/S0013-4686(97)10049-4
 El-Sayed, A.H., Abd El-Rehim, H.A., Khalifa, N.A. and El-Hag Ali, A. (1999) Preparation and characterization of supported hydrogels obtained by radiation grafting of binary monomers. Radiation Physics and Chemistry, 55, 219-229. doi:10.1016/S0969-806X(98)00329-6
 Abdou, S.M. and Mohamed, R.I. (2002) Characterization of structural modifications in poly-tetra-fluoroethylene induced by electron beam irradiation. Journal of Physics and Chemistry of Solids, 63, 393-398.
 Czvikovszky, T. and Hargitai, H. (1999) Compatibilization of recycled polymers through radiation treatment. Radiation Physics and Chemistry, 55, 727-730.