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Research Papers

Experimental Modeling of Wind-Driven Bin-by-Bin Resuspension Factors of Freshly Fallen Radionuclides After an Energetic Release From a Radiological Dispersal Device

[+] Author and Article Information
Sharman Perera

University of Ontario Institute of Technology,
ERC 4027,
2000 Simcoe St. N.,
L1H 7K4 Oshawa, ON, Canada
e-mail: Sharman.perera@uoit.ca

Edward Waller

University of Ontario Institute of Technology,
ERC 4063,
2000 Simcoe St. N.,
L1H 7K4 Oshawa, ON, Canada
e-mail: Ed.waller@uoit.ca

Ali Akhtar

University of Ontario Institute of Technology,
FESNS, ERC 3092,
2000 Simcoe St. N.,
L1H 7K4 Oshawa, ON, Canada
e-mail: Ali.akhtar@uoit.ca

1Corresponding author.

Manuscript received June 2, 2014; final manuscript received October 10, 2014; published online February 9, 2015. Assoc. Editor: Michal Kostal.

ASME J of Nuclear Rad Sci 1(1), 011005 (Feb 09, 2015) Paper No: NERS-14-1008; doi: 10.1115/1.4026390 History: Received June 02, 2014; Accepted November 14, 2014; Online February 09, 2015

Small-scale experiments were carried out to characterize the resuspension factor of radioactive lanthanum oxide powder in an environmentally controlled wind tunnel, with the majority using particle sizes less than 10μm in order to assess the impact of wind resuspension stresses and surface roughness conditions on resuspension. Operational principles of the measuring devices used in the radionuclide resuspension experiments and corresponding uncertainties are discussed. The average bin-by-bin particle resuspension factors (ki) for particle sizes, in the range of 0.257.00μm and 7.0012.5μm for downwind fallout locations, were calculated and are reported here as 1.14×1031/m and 4.39×1021/m, respectively.

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References

Figures

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Fig. 1

Resuspension factors for multiple wind resuspension stresses. A large variation is visible for resuspension factor across multiple studies [3,6,9,10-15]. (Reproduced from G. A. Sehmel [2] by permission of Elsevier B.V.)

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Fig. 2

Isometric view of experimental wind tunnel setup (Note: Figure is not to scale)

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Fig. 3

Locations of hotwire anemometers and particle sizers (with respect to contaminated plates) in experimental wind tunnel setup (Note: Figure is not to scale)

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Fig. 4

Instantaneous velocity measurements of hotwire anemometer (HW-3) for a duration of 107 min. The curve contains three distinct regions, namely, start-up, steady state, and shutdown.

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Fig. 5

Volume-based particle size distribution of lanthanum oxide (La2O3) powder measured using Malvern Spraytec laser diffraction system

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Fig. 6

Volume-based particle size distribution of lanthanum oxide (La2O3) powder measured by GRIMM portable spectrometer

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Fig. 7

View into the contamination chamber through a lead-glass window

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Fig. 8

Multiprobe radiation measuring system built out of nine alpha-beta-gamma (α, β, and γ) probes that were connected to SVG2 radiation monitoring systems via long telescopic handles to measure activity distribution of contaminated plates.

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Fig. 9

Comparison of resuspension factor (ki) corresponding to GRIMM particle sizer 1 location against established models [3,17,29,30]

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Fig. 10

Curve-fitting for resuspension factor (ki) corresponding to GRIMM particle sizer 1 (Curve Fit 1: 0.265–5.75 μm and Curve Fit 2: 5.75–32 μm)

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