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有夫生物学材料中的微量元素的信息,可通过用一带电粒子的聚焦射线所激发的特异性X线的检定来获得。用质子诱发X线放射(PIXE)作微探头分析,有时称为微质子射线放射(micropixe),是一种测检限度达10~6(百万分之几)的无创伤的检测法。作者用此法研究了年龄在2～75岁的11块浸软的颞骨内耳道底部和耳蜗基底转部位骨管的微量元素,发现钙与锌的分布与年龄有关。2～30岁时,骨壁全层钙均呈高浓度,锌存在于内耳道底部骨质的表面,随着年龄的增长(于40～60岁),骨表面锌的浓度增加,且出现在骨壁内,即神经管道的区域。在70岁时,锌也
Information on the trace elements in a biological material can be obtained by examining a specific X-ray excited by a focused beam of charged particles. Proton-induced X-ray emission (PIXE) for microprobe analysis, sometimes referred to as micropixe, is a noninvasive assay for detection limits of 10-6 (parts per million). The authors used this method to study the trace elements in the bottom of the medial auditory meatus and the cochlear basal ganglia in 11 macerated temporal bones aged 2 to 75 years and found that the distribution of calcium and zinc is age-related. When aged from 2 to 30 years, the calcium in the bone layer was highly concentrated. The presence of zinc was found on the surface of the bone in the bottom of the internal auditory canal. As the age increased (from 40 to 60 years), the zinc concentration on the bone surface increased, Within the bone wall, the area of the neural tube. At the age of 70, zinc also