Measuring and modeling transport properties of actinide and fission product contaminants in unsaturated prairie soil
Bibliographic record
Abstract
This paper presents the results of measuring and modeling the transport of actinides and fission products in unsaturated prairie soil based on the contamination from a storage tank in Alberta. In 1951, a release occurred from an underground storage tank of some 6.7 L of an acidic, aqueous solution containing an estimated 360 GBq (9.7 Ci) of dissolved mixed fission products in a 6.7 L acidic solution. The site where this occurred remained undisturbed for 50 years before soil samples were collected and analyzed for specific radionuclide content, namely Cs-137, U-238, and Sr-90. The measured diffusion coefficients (D d ) for the selected group of radionuclides were 3.0 × 10 –4 cm 2 s –1 (Cs-137), 1.5 × 10 –5 cm 2 s –1 (U-238), and 2.6 × 10 –3 cm 2 s –1 (Sr-90). Based on transport modeling, after a period of 250 years from the release, the Sr-90 plume would have its maximum concentration at a depth of 2.8 m, while the Cs-137 plume would have its maximum concentration at 0.5 m. It is predicted therefore, that if the three radionuclides should reach the water table depth (50 m) then they will be at a concentration lower than their clearance level values and, hence, will not pose a health hazard.Key words: transport modeling, unsaturated soil, radionuclides, diffusion coefficient, distribution coefficient, uranium, strontium, cesium.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".