热峰模型在聚碳酸酯非晶化潜径迹中的应用

Application of the thermal spike model to amorphous latent tracks in polycarbonate

为了描述快重离子在聚合物中的潜径迹行为 ,用不同能量的快重离子 (1 15 8GeVFe56 ,1 75 5GeVXe1 36 及 2 6 36GeVU2 38)辐照叠层半结晶聚碳酸酯膜 (MakrofolKG型 ) ,结合x射线衍射测量技术 ,在较宽的电子能损 (1 9— 17 1keV nm)和离子注量 (5× 10 1 0 — 3× 10 1 2 cm- 2 )范围研究了离子在半结晶聚碳酸酯中引起的非晶化过程 .应用径迹饱和模型假设 (损伤过程只发生在面积为σ的柱形径迹内 ) ,分别给出了Fe,Xe和U离子在不同电子能损下辐照聚碳酸酯时的平均非晶化径迹半径 .用热峰模型对实验结果进行了检验 ,结果表明Szenes的热峰模型较好地描述了离子在聚合物中的潜径迹行为 .

To describe the damage process of polymer in the energetic heavy-ion tracks by thermal spike model, polycarbonate foil (PC, Makrofol KG) stacks were irradiated with various swift heavy ions (1.158 GeVFe56, 1.755 GeVXe136 and 2.636 GeVU238) in a very wide range of electronic stopping power (from 1.9 to 17.1 keV/nm) and the range of fluence from I X 10(10) to 3 x 10(12) ions/cm(2). The amorphization processes in the irradiated PC were studied by x-ray diffraction. By using the saturated track model (the damaging process only occur in the cylindrical track of area sigma), the mean damage radii of tracks of the amorphization were calculated for Fe, Xe and U ion irradiation. The results obtained by using the thermal spike model, proved to be reasonable.