The electrical properties of PVDF thick film capacitors under gamma radiation are investigated. To increase the conductivity of the films, they were filled with 4 and 6wt.% of carbon, which is close to the percolation threshold. Screen-printing was used for film fabrication. All films were exposed to a disk-type 137 Cs source with an activity of 370kBq. Changes in I–V characteristics were measured after each exposure dose. A tenfold increase in the values of current was recorded after a dose of 228μGy for C-PVDF films with a thickness of 23.97μm and 6wt.% carbon doping. A higher dose of 342μGy resulted a decrease in the values of current. Thicker films showed an increase in the values of current with irradiation to a dose of 798μGy. PVDF+carbon system has potential applications in low-dose radiation dosimetry. The high current induced by radiation caused heating and electroforming of the device, due to the metal inclusions from the Ag contact material. It was noticed that as-printed films of 23.97μm in thickness, tend to electroform at about 12V, whereas films irradiated with 171μGy showed a strong electroforming effect at a lower voltage of 5V. For that reason, proper design of dosimetry systems is essential to eliminate such effects.Gamma radiation sensitivity of counterpart PVDF thick films with 4wt.% carbon doping was studied via capacitance-dose measurements in real time, since these samples were less conductive. Irradiation of this sensor with doses from 1.15 to 2.5mGy caused a considerable monotonic increase in the values of its capacitance from 2.92 to 12.37pF. Accordingly, sensors with 4wt.% of carbon could sustain higher radiation doses, but had poor sensitivity to radiation of lower level.