植物种子微孔结构的正电子湮没研究  

Study on microstructure of plant seeds by positron annihilation

作　　者：陆挺[1,2,3] 汪新福[1,2,3] 周宏余[1,2,3] 朱光华[1,2,3] 丁晓纪[1,2,3] 

机构地区：[1]北京师范大学低能核物理研究所,北京100875 [2]北京师范大学射线束技术与材料改性教育部重点实验室,北京100875 [3]北京市辐射中心,北京100875

出　　处：《核技术》2003年第2期129-131,共3页Nuclear Techniques

基　　金：国家自然科学基金重大项目(项目编号19890303)资助

摘　　要：以植物干种子芸豆和花生为生物体材料,采用正电子湮没技术(PAT)测定了该两类生物样品的正电子湮没寿命谱(PAL)。测量结果表明,在芸豆和花生内存在着大量微小的孔洞,孔洞的直径分别为0.48nm和0.7nm。植物种子的这类特殊的微孔结构是低能离子注入生物效应机理的基础。测量了注入200keV低能V离子的花生样品的PAL谱, 并与未经离子注入的花生样品的PAL谱作了比较。Positron lifetime measurements were performed on biological samples of lima bean and peanut. The ex-perimental results show that there are many small holes with diameter of 0.48nm and 0.7nm, respectively, in lima bean and peanut. The very special micro-hole structure of plant seeds is the basis of biological effect caused by ion implan-tation with low energy. The peanut seeds were implanted with vanadium ions at energy of 200keV. The positron anni-hilation lifetime (PAL) spectra for the implanted and non-implanted peanut samples were compared.

关 键 词：正电子湮没 植物种子 生物效应 离子注入 

分 类 号：Q947[生物学—植物学]