2026-08-26 アルゴンヌ国立研究所（ANL）
Pedestrian tests were conducted inside a tent facility to control the humidity and temperature and contain the dust. The researcher is seen entering the tent to left. Particle counters are located on the white table with their hoses extending into the tent to sample the air inside the tent. (Image by Argonne National Laboratory.)
＜関連情報＞
- https://www.anl.gov/article/when-the-dust-settles-researchers-measure-how-everyday-activity-spreads-hazardous-dust
- https://www.ovid.com/jnls/health-physics/abstract/10.1097/hp.0000000000002195~resuspension-of-threat-agents-from-paved-surfaces-and
舗装面からの有害物質の再浮遊と推奨される再浮遊係数 ― 歩行者または人員の活動および車両に関する現場実験 Resuspension of Threat Agents from Paved Surfaces and Recommended Resuspension Factors — Field Experiments with Pedestrian or Personnel Activity and Vehicles
Michael D.R. Kaminski,Nico Daiyega,Hannah Jaglinski
Health Physics Published:July 27, 2026
DOI:10.1097/HP.0000000000002195
Abstract
Resuspension of hazardous particles from paved surfaces poses significant risks during radiological contamination scenarios. Accurate modeling of particle resuspension dynamics is essential for developing effective mitigation strategies and ensuring public and responder safety. However, default resuspension factors in models may underestimate risks, particularly during emergency operations involving pedestrian and vehicle activity on freshly contaminated surfaces.
To address these gaps, we conducted pilot-scale field experiments using Arizona Test Dust (ATD) as a surrogate for threat agents. Human activities included casual walking, vigorous walking (marching), and vacuuming on concrete surfaces, while vehicle tests involved driving a sport utility vehicle (SUV) over asphalt in both drive-through (tires passing over dust) and drive-over (undercarriage passing over dust) configurations. Resuspension factors (Sf) were calculated for particle size ranges from 0.5–10 µm. Casual walking produced low resuspension factors, from <10-5 m-1 for 0.5-1.0 μm particles to <3 × 10-3 m-1 for 5-10 μm particles. In contrast, marching, which served as a surrogate for vigorous pedestrian or personnel movement, substantially increased resuspension, with Sf values ranging from 2 × 10-5 m-1 at 0.1-1 μm to 2 × 10-3 m-1 for 5-10 μm particles. Vacuuming caused measurable resuspension for smaller particles (Sf = 1.4 × 10-3 m-1), while larger particles remained undetectable. Vehicle tests showed higher resuspension factors for larger particles, with Sf values ranging from 3 × 10-4 m-1 to 2 × 10-2 m-1 during the first pass. Subsequent passes eventually reduced resuspension factors by an order of magnitude. These findings reveal significantly higher resuspension during emergency operations than many models assume. Our results apply to scenarios involving radioactive fallout, chemical, and biological agents, offering critical data to improve contamination control, emergency response planning, and risk assessment models.
