![]() ![]() uses a value of 4.įraction of the total amount of radon-222 produced by radium decay that escapes from the slimes fraction of the tailings particles and gets into the pores of the material. The activity concentrations typically increase with decreasing particle size. the sand fraction of the tailings material. Ratio of radium-226 activity concentrations in the slimes fraction vs. Assuming secular equilibrium in the ore between uranium-238 and radium-226, and that all radium goes into the tailings, an ore grade of 0.1% U (or 0.1179% U 3O 8) corresponds to a Ra-226-concentration of 12.4 Bq/g (334 pCi/g). In case the value is unknown, it can be estimated from the grade of the ore processed in the uranium mill. Overall activity concentration of radium-226 in the tailings material. Ra-226 Activity Concentration in tailings The button " Sample Data" initializes the tailings parameters to example values, most of which are given in. ![]() This selection must be made before any other entry, since it resets the complete calculator. The Activity unit can be selected for the whole calculator as pCi (pico-Curie = 10 -12 Ci) or Bq (Becquerel). This calculator is suitable for offline use. Ra-226 Act.Conc." may differ from the overall (weight-averaged) Ra-226 Activity Concentration. The values in the "Total/Avg." row are either totals (Surface Area and Total Rn-222 Release), or area-weighted averages (others). The contents of the Result field can be highlighted and copied for further use. The Result field repeats some input data and shows the calculation results. The properties of the tailings are defined in the Input Data table. Note that the moisture contents of the tailings may vary in the long term, depending on climatic conditions.Meaningful results for actual sites can only be obtained, if site-specific data is used. Note that some of the parameters show wide ranges of variation.In addition, the calculator optionally estimates the long-term moisture contents in each tailings zone based on rainfall and evaporation, and adjusts the diffusion coefficients correspondingly.įor calculating the effects of soil covers, see the Uranium Mill Tailings Cover Calculator.įor calculating the gamma radiation from a uranium mill tailings pile, see the External Radiation Dose Calculator. It performs one-dimensional, steady-state radon diffusion calculations for the following zones of the tailings deposit: the zone submerged under ponding water, the saturated beach zone, and the unsaturated zone: ![]() This calculator determines the radon flux from a bare and/or water-covered uranium mill tailings pile. Uranium Mill Tailings Radon Flux Calculator - HELP I don't trust this result, since there is a lot of noise present in the image, and the uncertainty calculated here is only around $\pm 0.3\%$Įstimate upper limits on flux values in the case of a non-detection? - similar problem, but relating to non-detection of a spectral line, not an image.Uranium Mill Tailings Radon Flux Calculator - HELP HOME WISE Uranium Project > Calculators > Uranium Mill Tailings Radon Flux Calculator > $\displaystyle \Omega_\text \approx 0.01$ I would like to know how to go from this, to an uncertainty in units of Jy km/s. I can measure the RMS, $\sigma$, in an emission-free region of the map, in units of Jy/beam km/s. I would now like to attach some uncertainty to that result. I measure the total flux density to be 3.0 Jy km/s. The integrated intensity map shows emission from a protoplanetary disk. I have some ALMA data, in the form of a spectral cube, which I have integrated along the velocity axis to create an integrated intensity ('moment 0') map. ![]()
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