Activation energy of etching for CR-39 as a function of linear energy transfer of the incident particles |
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Authors: | E M Awad and H M El-Samman |
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Institution: | Physics Department, Faculty of Science, Menoufia University, Shebin El Kom, Egypt |
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Abstract: | In this work, we have studied the effect of the radiation damage caused by the incident particles on the activation energy of etching for CR-39 samples. The damage produced by the incident particle is expressed in terms of the linear energy transfer (LET). CR-39 samples from American Acrylic were irradiated to three different LET particles. These are N (LET200 = 20 KeV/μm) as a light particle, Fe (LET200 = 110 KeV/μm) as a medium particle and fission fragments (ff) from a 252Cf source as heavy particles. In general the bulk etch rate was calculated using the weight difference method and the track etch rate was determined using the track geometry at various temperatures (50–90 °C) and concentrations (4–9 N) of the NaOH etchant. The average activation energy Fb related to the bulk etch rate vb was calculated from ln vb vs. l/T. The average activation energy Et related to the track etch rate vt was estimated from ln vt vs. l/T. It is shown that activation energy of etching is a constant value for CR-39 detector where Et was found to be independent on the damage produced by the incident particle. |
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Keywords: | CR-39 SSNTDs temperature concentration activation energy of etching Arrhenius equation N ion Fe ion fission fragment |
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