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Title: Charging, aggregation, and electrostatic dispersion of radioactive and nonradioactive particles in the atmosphere

Journal Article · · Aerosol research
 [1];  [2]; ORCiD logo [3]
  1. Louisiana State Univ., Baton Rouge, LA (United States)
  2. Georgia Institute of Technology, Atlanta, GA (United States)
  3. Georgia Institute of Technology, Atlanta, GA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Electrostatic dispersion can significantly impact the microphysical behavior of charged particles and ions until reaching zero space charge. However, although radioactive particles can be strongly charged in air, the influence of electrostatic dispersion has been neglected in understanding their behavior. This study is aimed at investigating the time evolution of the charge and size distributions of radioactive and nonradioactive particles in air and developing simple approaches for applications. With processes involving charging, aggregation, and electrostatic dispersion, a comprehensive population balance model (PBM) has been developed to examine particle charge/size distribution dynamics. It is shown that compared to nonradioactive particles, the charge and size distributions of radioactive particles may evolve differently with time because radioactivity and electrostatic dispersion can significantly affect the charging and aggregation kinetics of the particles. It is found that, after the Fukushima accident, background aerosols in the pathway of radioactive plumes might be highly charged due to ionizing radiation, suggesting that radiation fields may strongly influence in situ measurements of charged atmospheric particles. The comprehensive PBM is simplified, and then the verification and application of the simplified PBMs are discussed. This study provides useful insight into how radioactivity can affect the dynamic behavior of particles in atmospheric systems including radiation sources.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
Defense Threat Reduction Agency (DTRA); USDOE
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
2481193
Journal Information:
Aerosol research, Journal Name: Aerosol research Journal Issue: 2 Vol. 2; ISSN 2940-3391
Publisher:
Copernicus PublicationsCopyright Statement
Country of Publication:
United States
Language:
English

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