测量了５００ ｋｅ Ｖ—１ Ｍｅ Ｖ 的 Ｈｅ ＋ 离子穿过５０ —９０ μｍ 厚度的玉米种皮、葡萄果皮和西红柿果皮的透射能谱．结果表明这些生物厚靶是不均匀的，存在着类似于“沟道”的开放通道，沿着这些通道入射离子可以容易地透过靶材料．虽然大多数离子停留在靶中，但一部分透射离子只损失很少的能量．透射能谱显示出一种纯粹的电子阻止特征．３０ μｍ 厚度样品的透射电子显微镜图谱（ Ｔ Ｅ Ｍ） 显示１５０ ｋｅ Ｖ 的电子可以穿过这些样品得到很清晰的图象．β１ ，４ 葡聚糖是生物种皮或果皮细胞壁的重要的组成部分，计算了该分子链的电子结构，指出了生物样品中可能存在的通道方向． The transmission spectra of He + ions at 500 ke V-1 Me V through 50-90 μm thickness of corn seed coat, grape peel and tomato peel were measured. The results show that these biological thick targets are heterogeneous and there are open channels similar to “channels” along which incident ions can easily penetrate the target material. Although most ions stay in the target, only a fraction of the transmitted ions lose only a small amount of energy. Transmission spectroscopy shows a purely electronic blocking feature. Transmission electron microscopy (T E M) of a 30 μm sample shows that 150 ke V electrons pass through these samples to give a sharp picture. β 1, 4 glucan is an important part of the seed coat or pericarp cell wall, calculated the electronic structure of the molecular chain, pointed out that biological samples may exist in the direction of the channel.