Development of in-situ near-field fluorescence and Raman microscopy and structural analyses of radionuclide adsorption

从处置废物附近到我们生活的生物圈的地下环境被称为天然屏障，预计将提供屏障功能，以延缓释放的放射性核素通过扩散和吸附到岩石上的迁移。为了提高核废料处理的性能评价，必须了解这种吸附现象并建立模型。在这项研究中，近场光学技术被用于检测矿物表面吸附的放射性核素的发射，这些放射性核素可能是真实地下环境的主要成分。在已知表面结构的基础上，利用所得的荧光光谱和衰减进一步研究了它们的吸附结构。

Subsurface environments from the vicinity of disposed wastes to our-living biosphere are called natural barrier and expected to provide barrier function to retard the migration of released radionuclides through the diffusion and sorption to rocks. In order to improve the performance assessment of nuclear waste disposal, one must understand such sorption phenomena and model it. In this study, near-field optical technique was focused and used to detect emission from radionuclides adsorbed on the surfaces of minerals, which could be major constituents of real subsurface environments. The obtained fluorescence spectra and decays were further used to investigate their sorption structures on the basis of known surface structures of the surfaces.