Abstract
Systematic investigations have been made on the features of translucency observed on etched irradiated surface of plastics having a high density of α-tracks (>10 5 alphas/cm 2). Quantitative data are presented for the correlation between the optical density, etching time and track density for three plastic track detectors of different sensitivities (namely cellulose nitrate, cellulose acetate and polycarbonate) under different irradiation conditions. The role of some parameters (irradiation geometry, particle energy, environmental conditions etc.) in the observed α-ray patterns have been investigated. The effect of irradiation in vacuum on the optical density curves of the plastics has also been studied. A possibility for making energy- selective α-radiography by using the less sensitive plastics like polycarbonate has been shown.
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