Abstract
A mechanism of particle track etching in polymers is proposed, which is based on the assumption that a free reaction volume is required for enhanced chemical degradation in a particle track. The free reaction volume ν ∗ is supposed to be formed from the holes with a free volume ν f, which were produced in the latent track by release of gaseous products of radiolysis or post-irradiation reactions. The exponent in the empirical response function is considered to represent the ratio ν ∗/ν f . The influence of material parameters and etching conditions on the response function of cellulose nitrate track detectors is discussed in terms of the free reaction volume concept. The rapid energy transfer in macromolecules prior to bond cleavage suggests a linear dose dependence of the radiolysis product yield in a wide dose range. The radius restricted energy loss is favoured to be used in response functions from the point of view of radiation chemistry.
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