2024-08-06 パシフィック・ノースウェスト国立研究所(PNNL)
＜関連情報＞
- https://www.pnnl.gov/news-media/sniff-test-explosives-detection-extends-its-reach
- https://www.sciencedirect.com/science/article/abs/pii/S0039914023013139
数メートルの距離でのスタンドオフ微量爆発物蒸気検知 Standoff trace explosives vapor detection at meter distances
Megan K. Nims, Elizabeth H. Denis, Garret L. Hart, Nancy M. Escobedo, Shannon E. Murphy, R. Shane Addleman, Igor Novosselov, Robert G. Ewing
Talanta Available online: 16 December 2023
DOI:https://doi.org/10.1016/j.talanta.2023.125562
Graphical abstract
Highlights
- Atmospheric flow tube-mass spectrometry (AFT-MS) provides sensitive vapor detection.
- Combining AFT-MS with high-volume air sampling extends standoff detection distances.
- Detected RDX 2.5 m from a saturated vapor source after 10 s of sampling.
- Detected vapor from RDX and nitroglycerin residues at a 0.5-m standoff distance.
- Air currents affect probability of detection of explosive vapors.
Abstract
Vapor detection is a noncontact sampling method, which is a less invasive means of explosives screening than physical swiping. Explosive vapor detection is a challenge due to the low levels of vapors available for detection. This study demonstrates that the parts-per-quadrillion sensitivity of atmospheric flow tube-mass spectrometry (AFT-MS) combined with a high-volume air sampler enables standoff detection of trace explosives vapor at distances of centimeters to meters. Standoff detection of explosives vapor was possible both upstream and downstream of the vapor source relative to room air currents. RDX vapor from a saturated source was detected at up to 2.5 m. Vapors from RDX residue and nitroglycerin residue were detected at distances up to 0.5 m. The sampling can be optimized by accounting for air movement in the room or environment, which could further extend standoff detection distances. Using AFT-MS with a high-volume sampler could also be effective for standoff vapor detection of drugs and additional chemical threats and could be useful for security screening applications such as at mail facilities, border crossings, and security checkpoints.
