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Abstract

Stopping powers for vinyl chloride vinyl ecetate copolymer (Vyns) were measured both for (4)He ions in the range 200 keV to 3000 keV and for (1)H ions in the range 550 keV to 1750 keV using the transmission technique. A detector model is used for the energy calibration to improve the accuracy of the stopping power curve for (4)He ions in the low energy region. The estimated uncertainly in the stopping power values is approximately 1.5% for (4)He ions and approximately 2% for (1)H ions. A comparison is made between a parameterization of the present data and several parameterizations of the stopping power found in the literature. The stopping power values closest to the present experimental data for (4)He ions are obtained by adding elemental stopping powers using Bragg's rule. For this the experimental values for the C1 stopping power reported earlier should be used. The charge state scaling, sometimes used to take account for phase-state effects, is not appropriate for Vyns. For (1)H ions, the parametrization closest to our data is that of Janni from 1982.

Additional information

Authors: WÄTJEN U, JRC Geel (BE);MUNNIK F, JRC Geel (BE);PLOMPEN A J M, JRC Geel (BE);RÄISÄNEN J, JRC Geel (BE)
Bibliographic Reference: Article : Nuclear Instruments and Methods B (1996)
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