STUDIES ON THE LONG-RANGE PENETRATION BEHAVIOR OF LOW-ENERGY IONS IN BOTANIC SAMPLES
低能离子在植物样品中长程穿透行为的研究

Knowing the possible penetration depth of low-energy ions in botanic samples is essential to understand the mechanism of crop breeding induced by low-energy ion implantation to dry plant seeds. Energetic particles penetrated through certain botanic samples with thickners of 30μm,50μm and 100μm kidney bean slices and 20μm tomato peel in low-energy ion irradiation have been detected with transmission measurement. The experimental results demonstrated that the penetrated depth of low-energy ions in these botanic samples such as kidney bean slices was at least 60μm, which is much larger than the projectile range of such ions in normal solids samples. The probability of such long-range penetration was no more than 10-5. The distribution of damage induced by long-penetrated ions was not homogeneous. The energy spectra of high-energy protons transmit through samples were also obtained. It indicated that the damage to the botanic samples during the irradiation was not severe and the long-range penetration of low-energy ions in the botanic samples may result from the special structure of the samples.