Investigation of Stochastic Radiation Transport Methods in Binary Random Heterogeneous Mixtures

Reinert, D. R.; Schneider, Erich; Biegalski, Steven R

doi:10.13182/nse09-45

Cited by 11 publications

(4 citation statements)

References 5 publications

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“…A standard approach based on an ensemble average is commonly used to represent a complex aerosol deposit structure. This "atomic mix approximation" [17,18] is the fastest of all representations, but may lead to large errors if the mix material is composed of localized heavy absorbers [19]. This is unfortunately the problem with an aerosol (1 to 10 g/cm 3 ) in air (1 mg/cm 3 ).…”

Section: Introductionmentioning

confidence: 99%

“…Another approach is the so-called "chord-length sampling" [19,21], which consists of generating on the fly the particles encountered by the radiation. This generation is based on various parameters qualifying the distributions (size, shape, position, etc.).…”

Section: Introductionmentioning

confidence: 99%

“…This generation is based on various parameters qualifying the distributions (size, shape, position, etc.). Furthermore, because the position material is not constant [19], this method simulates transport through this ensemble, rather than radiation coming from it, as in the case of radioactive particles sampled on a filter. This approach will not be investigated in the present paper.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Simulation of a CAM-Measured Spectra Influenced by Coarse Aerosol

Dougniaux¹,

Soerjady²,

Ankrah³

et al. 2022

Atmosphere

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In nuclear facilities, the mandatory atmosphere surveillance is operated by Continuous Air Monitors. This standalone instrument is designed to measure the airborne aerosol activity concentration and to trig an alarm signal when a predetermined activity concentration is exceeded. However, a rapid resuspension event of coarse aerosol leads to a measurement error: the airborne aerosol activity concentration is over-evaluated. Prior results have shown that the coarse aerosol deposit disturbs the background evaluation for the radioactivity measurement. The interactions between radioactive aerosols (with radon daughters) and coarse non-radioactive aerosols have to be investigated by running together aerosol models and nuclear simulations. Therefore, this paper investigates different ways to represent an aerosol deposit in numerical simulations. We developed two numerical aerosol deposit models that we integrated into Geant4, a tool for the simulation of the passage of radiations through matter, and then compared these to experimental results. The simplest model was discarded, and by using the second model, we managed to correctly frame our simulation results as an experimental measurement: an aerosol has been correctly considered in a nuclear simulation. By combining theory, simulations, and experimentations on both aerosol science and nuclear physics, this research will be able to improve the comprehension of monitors’ behaviour in delicate situations and, more broadly, the filtration of aerosols using radioactivity.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical Simulation of a CAM-Measured Spectra Influenced by Coarse Aerosol

Dougniaux¹,

Soerjady²,

Ankrah³

et al. 2022

Atmosphere

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“…Four primary methods have been employed to solve stochastic mixture problems; the brute force method, atomic mixing, chord length sampling, and lattice structures [10]. A variety of sensitivity studies have been performed by Liu [11,12] on particle size and temperature distributions.…”

Section: Introductionmentioning

confidence: 99%

Turbulence Radiation Interactions in a Statistically Homogeneous Turbulence With Approximated Coal Type Particulate

Cleveland

Apte

Palmer

2012

Volume 1: Symposia, Parts a and B

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Turbulent radiation interaction (TRI) effects are associated with the differences in the time scales of the fluid dynamic equations and the radiative transfer equations. Solving on the fluid dynamic time step size produces large changes in the radiation field over the time step. We have modified the statistically homogeneous, non-premixed flame problem of Deshmukh et al. [1] to include coal-type particulate. The addition of low mass loadings of particulate minimally impacts the TRI effects. Observed differences in the TRI effects from variations in the packing fractions and Stokes numbers are difficult to analyze because of the significant effect of variations in problem initialization. The TRI effects are very sensitive to the initialization of the turbulence in the system. The TRI parameters are somewhat sensitive to the treatment of particulate temperature and the particulate optical thickness, and this effect is amplified by increased particulate loading.

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Chord length sampling method for analyzing stochastic distribution of fuel particles in continuous energy simulations

Liang

Brown

2013

Annals of Nuclear Energy

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Investigation of Stochastic Radiation Transport Methods in Binary Random Heterogeneous Mixtures

Cited by 11 publications

References 5 publications

Numerical Simulation of a CAM-Measured Spectra Influenced by Coarse Aerosol

Numerical Simulation of a CAM-Measured Spectra Influenced by Coarse Aerosol

Turbulence Radiation Interactions in a Statistically Homogeneous Turbulence With Approximated Coal Type Particulate

Chord length sampling method for analyzing stochastic distribution of fuel particles in continuous energy simulations

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