Radiation induced acid doping of PANI to generate electrical conductivity was achieved by radiation induced HCl release from chlorinated-polyisoprene (CIPIP). Blends of PANI with CIPIP were prepared by mechanical mixing/grinding in the composition range of 9-43% CIPIP by weight and pelletized under 10 t press. The pellets were irradiated in (60)Co Gammacell in air at room temperature to doses up to 300 kGy. The maximum electrical conductivity increase was observed for the blend PANI43 which changed from 10(-10) to 10(-4) S cm(-1) when it was irradiated to 300 kGy dose. Radiation induced changes on the blends were also studied by UV-vis spectroscopy using reflection technique and FTIR spectroscopy. The broad absorption band in the visible range (630 nm) increased by increasing irradiation dose. The band (1110 cm(-1)) in the IR spectra which is indicative of conductivity showed linear correlation with irradiation dose. (C) 2009 Elsevier Ltd. All rights reserved.