论文部分内容阅读
由于宇宙尘的研究能为太阳系和银河系的起源和演化提供有意义的信息,近年来受到宇宙化学家和天文地质学家越来越多的重视,成了科学界一个很活跃的领域。在铁质、硅质和玻璃质小球中难熔亲铁元素Ir、Os等及亲铁元素Ni、Co、(Cr)及微量元素Sc的测定,在硅质和玻璃质小球中稀士元素的测定对于球粒来源的判别是非常重要的依据。然而由于宇宙尘样品很少,一般的化学分析方法很难给出可靠的数据,本工作是采用灵敏度高,取样量少,且具多元素分析能力的中子活化分析测定了上逑各种小球中难熔亲铁元素和其它微量元素的含量。实验结果表明宇宙尘中难熔亲铁元素、亲铁元素的含量高于地壳样品。从硅质和玻璃质两种球粒以及几种地壳样品与碳质球粒陨石型稀士和Sc的归一化模式图可以看出:地壳样品由于经历了化学分馏,稀士模式成斜线型,而硅质和玻璃质宇宙尘的归一化稀士模式成较平坦的未分馏型。事实表明中子活化分析是研究宇宙尘的较可取的方法。
Since the study of cosmic dust can provide meaningful information on the origin and evolution of the solar system and the Milky Way, it has become an active field in the field of science in recent years due to the increasing attention paid by cosmologists and astronomers. In ferrous, siliceous and vitreous balls refractory pro-iron elements Ir, Os and other pro-iron elements Ni, Co, (Cr) and trace elements Sc determination, silicon and vitreous beads in the rare earth Determination of the elements for the determination of the source of pellets is a very important basis. However, due to the small sample of cosmic dust, it is very difficult to give reliable data by the general chemical analysis method. In this work, neutron activation analysis with high sensitivity, small sample amount, Ball refractory pro-iron elements and other trace elements content. The experimental results show that the content of refractory progeny Fe and Fe in the cosmic dust is higher than that of crustal samples. From the normalized patterns of silica and vitreous spherulites and several crustal samples with carbonaceous chondrites and Sc, we can see that the crust samples are undergone chemical fractionation due to chemical fractionation, Type, while the normalized and homogeneous patterns of siliceous and vitreous cosmic dust are flatter and unfractionated. The fact shows that neutron activation analysis is the more preferable method for studying cosmic dust.