Accurate determination of platinum group elements in felsic rocks using isotope dilution neutron activation analysis to study the genesis of the rocks

铂族元素铱、锇、钌在长英质岩石中的丰度非常小，甚至在参考岩石中的丰度也没有明确测定。本研究将火试法与同位素稀释中子活化分析相结合，从大量样品中富集铂族元素，回收率准确，灵敏度高。由于2011年东海大地震导致研究用核反应堆关闭，原先的研究计划被修改。

Platinum group elements such as iridium, osmium and ruthenium are contained very small abundance in felsic rocks and even the abundance in reference rocks have not been determined clearly. This study combined fire assay method to concentrate platinum group elements from big amount of samples with isotope dilution neutron activation analysis to get accurate recovery and high sensitivity for the elements. The original research plan was modified by shutdown of research nuclear reactor at Tokai by big earthquake in 2011.