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首页> 外文期刊>International journal of PIXE >APPLICATION OF A DROPLET-PIXE SYSTEM TO STUDY RADIATION EFFECTS ON ECOSYSTEM FUNCTIONING
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APPLICATION OF A DROPLET-PIXE SYSTEM TO STUDY RADIATION EFFECTS ON ECOSYSTEM FUNCTIONING

机译：液滴-像素系统在研究辐射对生态系统功能的影响中的应用

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Droplet PIXE analysis was applied to the study of radiation effects on soil ecosystem functioning. A paddy soil sample was flooded with well water to prepare soil ecosystem specimens (microcosms), and then the microcosms were chronically exposed to gamma rays at a dose rate of 1 Gy day?1 for 5 days. After the final irradiation, a brownish discoloration was observed in the liquid phases of the irradiated microcosms.To clarify the factors causing the discoloration, minerals in the solutions of the microcosms were analyzed by the droplet PIXE system.Elemental profiles from the XRF spectrum showed marked iron peaks. Exposure of microcosms to gamma rays resulted in a decrease in the iron levels. Since iron is released in the form of Fe(II) from the solid soil to the liquid phase, further determination of the Fe(II) levels was performed. The percentages of Fe(II) to the total iron in the liquid phase of the irradiated microcosms were lower than those of the controls. This result may be caused by the change of Fe species from soluble Fe(II) to insoluble Fe(III) during gamma irradiation, and the Fe(III) species with a brownish color may be associated with the discoloration of the irradiated samples. The conversion from soluble to insoluble forms may also contribute the small amount of dissolved iron in the irradiated microcosms. Iron is an essential trace nutrient for plants, and thus the amount of dissolved iron is one aspect of ecosystem functioning. Effects of gamma radiation on the dissolved iron could involve a change in the soil ecosystem through the depression of iron flux in the long term.
机译：液滴PIXE分析被用于研究辐射对土壤生态系统功能的影响。用井水淹没稻田土壤样品以制备土壤生态系统标本（缩影），然后将缩影以1 Gy天？1的剂量率长期暴露于伽马射线5天。最终辐照后，在被辐照的微观世界的液相中观察到褐色的变色，为澄清导致变色的因素，通过液滴PIXE系统分析了微观世界溶液中的矿物质，XRF光谱的元素谱显示出明显的铁峰。微观世界暴露于伽马射线会导致铁含量降低。由于铁以Fe（II）的形式从固体土壤释放到液相，因此需要进一步测定Fe（II）的含量。辐照过的微观液相中Fe（II）在总铁中所占的百分比低于对照组。此结果可能是由于在伽马射线辐照过程中Fe物种从可溶性Fe（II）变为不溶性Fe（III）而引起的，带有褐色的Fe（III）物种可能与被辐照样品的变色有关。从可溶形式到不溶形式的转化还可以在辐照的微观世界中贡献少量溶解的铁。铁是植物必需的微量营养素，因此溶解铁的量是生态系统功能的一个方面。伽马射线对溶解铁的影响可能会通过长期抑制铁通量来改变土壤生态系统。

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