Development of measuring exchange of ultrafine particles using radioactive nuclide as a tracer

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It remains to be fully elucidated how the presence of aerosol particles influences plant and human. Removal mechanisms of airborne substances over the ground consist mainly of wet and dry deposition processes. Although the mechanism of dry deposition is more complicate than wet deposition, little information on dry deposition of ultrafine aerosol particles is available. In this study we developed the implement of measuring the dry deposition flux of ultrafine particles using unattached radon progeny as a tracer.