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Uranium Mill Tailings Radon Flux Calculator

(last updated 21 Mar 2011)
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Determine the radon flux from a bare and/or water-covered uranium mill tailings pile.

(For calculating the effects of soil covers, see the Uranium Mill Tailings Cover Calculator.)

Select activity unit first, then enter the parameters and click the "Calculate" button below. HELP
Numbers can be entered in exponential notation: 5 · 10-6 = 5e-6
Fractions are to be entered in the 0 - 1 range.

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Activity unit:     pCi     Bq

Input Data
        Tailings Data   HELP

General tailings properties   HELP

Ra-226 Activity Ratio in slimes vs. sand:
Rn-222 Emanation Fraction in slimes:
Rn-222 Emanation Fraction in sand:
Fraction Passing #200 Mesh (75 m):
Fraction of pond area with less than 1 m depth:
Average pond depth for areas greater than 1 m deep: m
Ra-226 Activity Concentration in ponding water:       - or -
Ratio of radium in solution to radium in tailings solids: g/cm3
Effective stagnant water transport coefficient: m2/s

Zone-specific tailings properties   HELP
Surface Area
Bulk Density *)
Porosity *)
Moisture Contents
[dry wt_%]
Fraction Passing #200 Mesh (75 m)Rn-222 Eff. Diff.Coeff *)

Options   HELP
Annual Precipitation: *) cm
Annual Lake Evaporation: *) cm
Depth to Water Table: *) m
*) optional



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