Abstract
The effects of alpha energy, track density, and etching duration on the electrochemical etching (ECE) amplification of alpha and recoil tracks in polycarbonate were studied using a mixture of 15g KOH + 40g C 2H 5OH + 45g H 2O at 25 °C applying 32 kV/cm at 2 kHz. Complex families of responses were obtained and two track groups were observed; smaller tracks due to energy losses of alpha particles themselves showing Bragg-type responses, and larger recoil-type tracks due to alpha-induced recoils from Rutherford-type scattering with light nuclei of carbon and oxygen. A significant reduction in both efficiency and mean track diameter with increase in track density was found and its effect on the responses was demonstrated. Systematic changes on the responses around the Bragg peak occurred by changing the track density and etching duration. The results are discussed with recommendations on considering the formation of recoils on alpha quality factor and considering track density as an affecting parameter for any precise and accurate dosimetric, spectrometric and parametric studies.
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