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Simple ORNL model Provided in Quick Basic, re-implemented as visual basic in Excel Simple gas dispersion Deposition not explicitly output No gravitational settling Inputs Particle size fractions Stability category

Simple ORNL model • Provided in Quick Basic, re-implemented as visual basic in Excel • Simple gas dispersion • Deposition not explicitly output • No gravitational settling
Inputs • Particle size fractions • Stability category (optional) • Wind speed • Mean particle size • Particle size ranges (optional) • TNT equivalent • Deposition velocity by particle size range • Mass of material • Height/radius of source (including entrained material)
Outputs • Fraction of material airborne • Estimate of mean particle size • Fractions of material in particle size ranges (assuming log normal distribution) • Integrated air concentration • Time weighted average air concentration • No deposition (estimated using deposition velocity) • No upwind spread
Preliminary findings • Estimated/guessed inputs • Test 1 • Material carries too far (95% within 500m) • No gravitation settlement • Small fraction air borne (16%)

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