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"A novel technique to estimate the track dimensions induced by heavy ions on UHMWPE"
M.F. del Grosso, V.C. Chappa, G. García Bermúdez and R.O. Mazzei
Proc. of the "6th International Symposium on Swift Heavy Ions in Matter" (SHIM 2005), Aschaffenburg, Germany, May 28-31, 2005. Ed. R. Neumann, P. Apel, M. Toulemonde and C. Trautmann
Nucl. Instrum. Meth. B 245(1) (2006) 281-283
The energy deposition of a heavy ion in a latent track gives rise to a central partially melting core zone surrounded by a larger region where some physico-chemical modifications take place. When these latent tracks start to overlap some interference effect occurs. A previous irradiated zone of one latent track can be eliminated by the core zone of others. In the present, work a Monte Carlo simulation program that permits us to determine the track dimensions is described. The core and chemical radii are obtained from fitting the FTIR absorption as a function of fluence. This new method was applied specifically on ultra-high molecular weight polyethylene (UHMWPE) irradiated with a 72 MeV S beam. The inner core radius value obtained was 5 ± 1 nm.
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