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NMR (Nuclear Magnetic Resonance) of 1 H is applied for the first time to the three-dimensional imaging of hydrogen-bearing samples (stilbite, agate, and enhydros) from geothermal fields. The spin-spin relaxation time of the nuclei of 1 H in hydrous minerals is very short, so that it has been difficult to detect NMR signals with a high S/N ratio. This technical problem has been solved...
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