Influence of radioactivity on surface interaction forces

Walker, M; McFarlane, Joanna; Glasgow, David; Chung, Eunhyea; Taboada-Serrano, Patricia; Yiacoumi, Sotira; Tsouris, Costas

doi:10.1016/j.jcis.2010.06.042

Cited by 15 publications

(14 citation statements)

References 19 publications

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“…The three approaches attained above employ different methods to simulate charging of particles. These methods were evaluated by comparing their prediction results with measurements obtained using radioactive charge neutralizers (Liu and Pui, 1974;Wiedensohler and Fissan, 1991;Alonso et al, 1997) and radioactive particles (Gensdarmes et al, 2001). Initial conditions for the simulations were determined from the measurements.…”

Section: Methods To Simulate Particle Chargingmentioning

confidence: 99%

Charging and coagulation of radioactive and nonradioactive particles in the atmosphere

et al. 2016

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Abstract. Charging and coagulation influence one another and impact the particle charge and size distributions in the atmosphere. However, few investigations to date have focused on the coagulation kinetics of atmospheric particles accumulating charge. This study presents three approaches to include mutual effects of charging and coagulation on the microphysical evolution of atmospheric particles such as radioactive particles. The first approach employs ion balance, charge balance, and a bivariate population balance model (PBM) to comprehensively calculate both charge accumulation and coagulation rates of particles. The second approach involves a much simpler description of charging, and uses a monovariate PBM and subsequent effects of charge on particle coagulation. The third approach is further simplified assuming that particles instantaneously reach their steady-state charge distributions. It is found that compared to the other two approaches, the first approach can accurately predict time-dependent changes in the size and charge distributions of particles over a wide size range covering from the free molecule to continuum regimes. The other two approaches can reliably predict both charge accumulation and coagulation rates for particles larger than about 0.04 micrometers and atmospherically relevant conditions. These approaches are applied to investigate coagulation kinetics of particles accumulating charge in a radioactive neutralizer, the urban atmosphere, and an atmospheric system containing radioactive particles. Limitations of the approaches are discussed.

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Section: Methods To Simulate Particle Chargingmentioning

confidence: 99%

Charging and coagulation of radioactive and nonradioactive particles in the atmosphere

et al. 2016

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“…Charge of the radionuclides is the determining factor for exchange sorption. It has been shown that radioactive particles can be strongly charged and yield an asymmetric bimodal charge distribution [34,35]. Therefore the processes involving electrostatic interactions will play a role in predicting their transport.…”

Section: Ion Exchange Sorptionmentioning

confidence: 99%

Understanding Sorption Behavior and Properties of Radionuclides in the Environment

Saint‐Fort¹

2018

Principles and Applications in Nuclear Engineering - Radiation Effects, Thermal Hydraulics, Radionuclide Migration in the Envir

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Prediction of fate and behavior of radionuclides in the environment is largely governed by sorption processes. Radionuclides physico-chemical species interacting with prevailing abiotic properties of the environment vary widely among varying constituting environmental components. Herein, this work discussed the most significant aspects of sorption processes and properties at the solid-water interface. Main sorption mechanisms were investigated using kinetic, thermodynamic analyses, and various mathematical models in current use for description of sorption-desorption processes in the environment. Knowledge of environmental transport, environmental pathways, and exposure pathways to radionuclides is also an important aspect of any strategy to protect the public and the natural ecosystems. In the final analysis, the choice of a functional sorption equation model will be dictated by the risk-based under consideration, the level of information available, and the intrinsic accuracy of the predictive model.

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“…Additionally, radioactive particles can favorably interact with raindrops due to the electrostatic image force generated between them. Recent experiments of Walker et al (2010) suggested that radioactivity increased the adhesion force between a charged particle and a conductive surface through the generation of the attractive image force. Radioactive surfaces can be charged at humid conditions (Kweon et al, 2013) and the surface charge of the particles in the proximity of raindrops can generate an attractive electrostatic image force (Tripathi and Harrison, 2001).…”

Section: Charge Distribution Of Radioactive Particles In Open Airmentioning

confidence: 99%

“…So far, it has been assumed that, because radionuclides are typically carried by background aerosols (Kaneyasu et al, 2012), radioactive particles behave similarly to atmospheric particles, whose electrostatic surface interactions are neglected (Seinfeld and Pandis, 2006). It has been shown, however, that radioactive particles can be strongly charged (Clement and Harrison, 1992;Gensdarmes et al, 2001;Kim et al, 2014;Kweon et al, 2013;Reed et al, 1977;Walker et al, 2010;Yeh et al, 1976); therefore, the assumption of neglecting electrostatic interactions may cause inaccuracies in predicting transport of radioactive particles. Nevertheless, the assumption has been used in many cases with the explanation that the presence of ionizing radiation induces charge neutralization of particles in open air (Greenfield, 1956(Greenfield, , 1957.…”

Section: Introductionmentioning

confidence: 99%

Surface charge accumulation of particles containing radionuclides in open air

Kim

Yiacoumi

Tsouris

2015

Journal of Environmental Radioactivity

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Radioactivity can induce charge accumulation on radioactive particles. However, electrostatic interactions caused by radioactivity are typically neglected in transport modeling of radioactive plumes because it is assumed that ionizing radiation leads to charge neutralization. The assumption that electrostatic interactions caused by radioactivity are negligible is evaluated here by examining charge accumulation and neutralization on particles containing radionuclides in open air. A charge-balance model is employed to predict charge accumulation on radioactive particles. It is shown that particles containing short-lived radionuclides can be charged with multiple elementary charges through radioactive decay. The presence of radioactive particles can significantly modify the particle charge distribution in open air and yield an asymmetric bimodal charge distribution, suggesting that strong electrostatic particle interactions may occur during short- and long-range transport of radioactive particles. Possible effects of transported radioactive particles on electrical properties of the local atmosphere are reported. The study offers insight into transport characteristics of airborne radionuclides. Results are useful in atmospheric transport modeling of radioactive plumes.

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Influence of radioactivity on surface interaction forces

Cited by 15 publications

References 19 publications

Charging and coagulation of radioactive and nonradioactive particles in the atmosphere

Charging and coagulation of radioactive and nonradioactive particles in the atmosphere

Understanding Sorption Behavior and Properties of Radionuclides in the Environment

Surface charge accumulation of particles containing radionuclides in open air

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