Abstract
Magnetic resonance imaging (MRI) has recently been proposed as an in situ subsurface imaging technique for locating buried objects in fully hydrated soils. This paper explores the available hydrogen [Formula: see text] nuclear magnetic resonance (NMR) signal from water in fully hydrated monodispersed synthetic sands (glass beads) as a predictor of the utility of subsurface MRI. The MRI signal from hydrated soils is a function of three main properties of water in the voids between the soil particles: the spin-lattice relaxation rate [Formula: see text], the spin-spin relaxation rate [Formula: see text], and the spin density [Formula: see text]. The [Formula: see text] values were measured for random close packed synthetic sands as a function of particle diameter. The [Formula: see text] and [Formula: see text], values were measured at a magnetic field strength of [Formula: see text] as a function of particle diameter. [Formula: see text] was also measured as a function of magnetic field strength at 0.235, 2.35, 23.5, and [Formula: see text]. The synthetic sands studied have a predictable [Formula: see text] and [Formula: see text], and a constant [Formula: see text]. The water in these sands also has a predictable [Formula: see text] as a function of applied magnetic field. Therefore, fully hydrated monodispersed real sands are expected to have a predictable NMR signal.
Published Version
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