1,721,160 research outputs found
Isterectomia vaginale e addominale: confronto e prospettive. A proposito di 385 consecutivi
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Using 222-Radon as tracer for areal and vertical distribution of hydrocarbon contaminations
No full textNon-aqueous Phase Liquids (NAPLs), including crude oil and its refined products, produce a long lasting
impact on the enviroment due to unwilling releases. Storage sites of fuel and pump stations are often involved
in unwilling NAPL spills in the subsoil and/or groundwater. The non-polar nature of these contaminants
confers them a slight solubility in water, causing a reduced efficency of the most common remediation
techniques. These limitations result in long-term remediation activities with high related costs. Unconventional
characterization methods like the Radon (222Rn)-deficit technique are meant to supplement and optimize the
conventional approach by providing dense spatial information in quasi-real time, and at a reasonable cost
(De Miguel et al., 2020). Schubert (2015) presented a comprehensive review of the use of 222Rn as a natural
tracer to assess subsurface NAPL contamination. In the present work Radon deficit technique was applied to
determine the vertical distribution of Rn in groundwater inside a gasoline contaminated area. Twelve passive
accumulators PDMS-AC (polydimethylsiloxane mixed with activated carbon) were inserted at different depth
inside fenestrated piezometers and left for two weeks to maximize the Rn accumulation. Then they were
measured by high resolution gamma spectometry. PDMS-AC are characterized by a high permeability to Rn
and impermeability to water (Voltaggio & Spadoni, 2013). The obtained results suggest the possible application
of Radon deficit to find not only the areal but also the vertical distribution of a NAPL contamination in the
saturated level. This datum could offer interesting applications to estimate initial and residual volumes of the
contaminant during remediation procedures
Simulation of indoor radon and ventilation systems in a scale model room to assess the contribution of high activity building materials to indoor radon.
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Pleistocene terraced travertines and fluvial deposits, incision and uplift in Acquasanta Terme area (central Apennines, Italy)
No full textMarine terraces in the Tyrrhenian Sea margin of the Southern Apennines (Italy): new constraints on differential vertical motions from dated paleoshorelines
No full textPlio-Quaternary evolution of the central Apennines: the case of the Medium-Upper Aniene River Valley (Latium, central Italy)
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