Los Alamos National Security, LLC

U.S. Department of Energy

Algis Urbaitis

Michelle A Espy

Petr Lvovich Volegov

Andrei Nikolaevich Matlashov

Robert Henry Kraus, Jr

Larry Joe Schultz

Jacob Luther Yoder

Igor Mykhaylovich Savukov

Stephen Surko

Henrik Sandin

Methods for determining the identity of a substance are provided. A classification parameter set is defined to allow identification of substances that previously could not be identified or to allow identification of substances with a higher degree of confidence. The classification parameter set may include at least one of relative nuclear susceptibility (RNS) or an x-ray linear attenuation coefficient (LAC). RNS represents the density of hydrogen nuclei present in a substance relative to the density of hydrogen nuclei present in water. The extended classification parameter set may include T, T, and/or Tas well as at least one additional classification parameter comprising one of RNS or LAC. Values obtained for additional classification parameters as well as values obtained for T, T, and Tcan be compared to known classification parameter values to determine whether a particular substance is a known material.

Classification of materials using nuclear magnetic resonance dispersion and/or x-ray absorption

Method comprising obtaining an NMR measurement from a sample wherein an ultra-low field NMR system probes the sample and produces the NMR measurement and wherein a sampling temperature, prepolarizing field, and measurement field are known; detecting the NMR measurement by means of inductive coils; analyzing the NMR measurement to obtain at least one measurement feature wherein the measurement feature comprises T1, T2, T1&#x3c1;, or the frequency dependence thereof; and, searching for the at least one measurement feature within a database comprising NMR reference data for at least one material to determine if the sample comprises a material of interest.

Ultra-low field nuclear magnetic resonance and magnetic resonance imaging to discriminate and identify materials

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Albuquerque, NM, United States of America

Algis Urbaitis