Autonomous, broad-spectrum detection of hazardous aerosols in seconds |
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Authors: | Steele Paul T Farquar George R Martin Audrey N Coffee Keith R Riot Vincent J Martin Sue I Fergenson David P Gard Eric E Frank Matthias |
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Affiliation: | Lawrence Livermore National Laboratory, Livermore, California 94550, USA. |
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Abstract: | Actual or surrogate chemical, biological, radiological, nuclear, and explosive materials and illicit drug precursors can be rapidly detected and identified when in aerosol form by a Single-Particle Aerosol Mass Spectrometry (SPAMS) system. This entails not only the sampling of such particles but also the physical analysis and subsequent data analysis leading to a highly reliable alarm state. SPAMS hardware is briefly reviewed. SPAMS software algorithms are discussed in greater detail. A laboratory experiment involving actual threat and surrogate releases mixed with ambient background aerosols demonstrates broad-spectrum detection within seconds. Data from a field test at the San Francisco International Airport demonstrate extended field operation with an ultralow false alarm rate. Together these data sets demonstrate a significant and important advance in rapid aerosol threat detection. |
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