Thermal spike analysis of low energy ion tracks

被引:5
作者
De Cicco, H
Saint-Martin, G
Alurralde, M
Bernaola, OA
机构
[1] Comis Nacl Energia Atom, Dept Mat, RA-1429 Buenos Aires, DF, Argentina
[2] Comis Nacl Energia Atom, Dept Radiobiol, RA-1429 Buenos Aires, DF, Argentina
关键词
thermal spike; tracks diameter; polymers;
D O I
10.1016/S1350-4487(99)00088-8
中图分类号
TL [原子能技术]; O571 [原子核物理学];
学科分类号
0827 ; 082701 ;
摘要
The theoretical track diameter of low energy ions in organic materials is usually estimated through the model of dose deposition by delta rays, with results remarkably lower than the experimental values obtained via a replica method and electron microscopy. The track detector used here is Makrofol-E and the ions studied have specific energies between 1.4 and 100 keV/n. To evaluate the problem from another point of view, thermal effects for track formation, a modified version of the "liquid drop model" for insulators was applied. The electronic as well as nuclear energy deposition by an individual ion are considered and the thermal spike evolution is studied. The model allows for the formation of ion tracks in a range of energies previously considered as "forbidden". There still exists a discrepancy between the experimental data and the track diameters predicted by the model, and although this difference is smaller than the obtained with previous calculations, it suggests the necessity of further adjustments.
引用
收藏
页码:77 / 80
页数:4
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