Standoff Detection of Weapons and Contraband in the 100 GHz to 1 THz Region

By Roger Appleby, H. Bruce Wallace. IEEE Transactions on Antennas and Propagation, 2007

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Explosives Detection by Terahertz Spectroscopy—A Bridge Too Far? (2011, methodology): “Terahertz radiation is attenuated as it passes through the atmosphere, principally due to absorption from water vapor [30].”
Penetrating 3-D Imaging at 4- and 25-m Range Using a Submillimeter-Wave Radar (2008, background): “Depending on atmospheric conditions (primarily humidity), the round-trip signal attenuation for 50 m standoff is expected to lie anywhere between 1 dB and 50 dB at 600 GHz [1], but at the local attenuation minimum of 670 GHz, the worst case scenario is only a 20 dB loss.”
A Frequency-Multiplied Source With More Than 1 mW of Power Across the 840–900-GHz Band (2010, positive): “It can also enhance terahertz imaging applications by driving frequency multipliers to even higher frequencies [21]–[23], such as the 2.”
THz Imaging Radar for Standoff Personnel Screening (2011, background): “For a recent reviews of the various 100 GHz technologies for concealed weapons detection, see [8] and [9].”