During March to April for almost year we observe high concentration event of atmospheric soil particles, called Kosa .Soil particles in Kosa occurs at Chinese dessert (Gobi dessert or Takla Makan dessert) and trandfer to Japan. The concentrations on Kosa event observed at Osaka are higher than 100μg/m3 in which maximum concenration we have observed was 600 μg/m3 . We observed Kosa event at Apr. 1st and 2nd in 2007 of which concentrations were 120 and 590μg/m3 respectively. The aerosol on these days were collected and the other samples before and after these Kosa event were also collected. We have analyzed the elemental concentrations on these samples by neutron activation analysis. On this paper we will show the elemental concentration change for before and after Kosa event.
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机译：在3月至4月近年来，我们观察大气土壤颗粒的高浓度事件，称为Kosa。科萨中的粒子发生在中国甜点（Gobi Dessert或Takla Makan Dessert）和日本的小组。在大阪观察到的Kosa事件的浓度高于100μg/ m 3，其中我们观察到的最大致力为600μg/ m 3。我们在2007年4月1日和第2期观察了科萨活动，其中浓度分别为120和590μg/ m 3。这些天的气溶胶被收集，并收集了这些Kosa事件之前和之后的其他样品。通过中子激活分析，我们分析了这些样品上的元素浓度。在本文中，我们将显示KOSA事件前后的元素浓度变化。
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