Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/58187
Type: Artigo de periódico
Title: Thickness alterations of CR-39 plastic detectors due to the heating influence: Basic theory and experimental results
Author: Rana, MA
Guedes, S
Iqbal, M
Abstract: Heating experiments were conducted on CR-39 polymer/plastic detector samples at temperatures between 50 and 175 degrees C for various time intervals from 5 to 210 mm to investigate the thermal behavior of detector material. Mass and thickness of un-heated and heated polymer samples were measured. Three distinct regimes have been observed showing different degrees of changes in thickness and mass of annealed samples. The percent change of thickness was considerably higher than the mass change during heating. Thermodynamic concepts are used to explain the experimentally observed heating regimes. Role of the difference between free energies of lateral and fold surfaces in detector thickening during heating is discussed. Scanning electron microscopy (SEM) was carried out on un-heated and heated CR-39 samples to examine the surface alterations due to heating. Results are useful for researchers who employ track detectors for radiation measurements in nuclear reactors and cosmic rays. They are also interesting for researchers in related fields, like fission track dating, which consider the thermal history of track recording materials. Our quantitative data and SEM imaging suggests that structural changes, especially surface changes in CR-39 polymer are very important and need to be explored carefully through joint SEM and the Atomic Force Microscopy (AFM). (c) 2012 Elsevier Ltd. All rights reserved.
Subject: CR-39 plastic detector
Annealing
Swelling
Free energy
Thermodynamic damping
SEM
Country: Inglaterra
Editor: Pergamon-elsevier Science Ltd
Rights: fechado
Identifier DOI: 10.1016/j.radmeas.2012.07.014
Date Issue: 2013
Appears in Collections:Unicamp - Artigos e Outros Documentos

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