POSITRON ANNIHILATION STUDY ON SURFACESTRUCTURE OF BIOLOGICAL SAMPLES IMPLANTED BY IONS WITH LOW ENERGY

• 来源期刊: 中国物理（英文版）
• 学科: 物理学
• 关键词: ion implantation biological effect positron annihilation
• 年，卷（期）: 2001,（2）
• 所属期刊栏目: CONDENSED MATTER: STRUCTURE, THERMAL AND MECHANICA
• 页码范围: 145-147
• 页数: 3页
• 分类号: O4
• 语种: 英文

摘要

The organic materials of biological samples, such as lima bean and peanut, were implanted respectively by nitrogen ions with an energy of 100 keV and vanadium ions with an energy of 200 keV. The positron annihilation lifetime spectra of implanted and non-implanted samples were compared with each other especially in r3 and I3. The experimental results showed that before implantation there were many small holes with diameters of 0.48 and 0.7 nm in lima bean and peanut, respectively. After ion implantation, the size of holes would be changed because of organism cross-linking and scission. The effective penetration range of implantation of ions with low energy into biological samples is about 200μm.