sno+ background study: polonium on acrylic vessel surface and radon assay
Why this work is in the frame
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Bibliographic record
Abstract
SNO+ is a 780 tonnes organic liquid scintillator neutrino detector located at Vale’s \nCreighton mine, Sudbury, ON. 2 km overburden of rock above helps to achieve the low \ncosmic radiation background level of SNO+. Meanwhile, radioactive material in the rock \ncan decay and produce radiation in the region of interest for the search of 0νββ decay. SNO+ \nis looking for neutrinos at very low energy and thus it is crucial to have a low background \nenvironment. My thesis evaluates two kinds of background sources: 222Rn and 210Po. 222Rn \nis the progeny of 238U in the rock. The water and gas assays are used to monitor the 222Rn \nconcentration in the surrounding cavity water and other parts of the experiment or other \ngas volumes in SNOLAB. The analysis of the SNO+ data helps to understand the 210Po \nactivity on the internal surface of the detector’s acrylic vessel. The 222Rn level in the cavity \nwater is below the target of 4.5 × 10−13 gU238/gH2O. The Rn levels in the LN2 plant and \ninternational dewar are at a 10−4 \nreduction factor compared to mine air. The 210Po background level in the internal AV is holding a relatively constant level of about 1800 events \nper second. Spatially, the 210Po backgrounds are more active at the equator and the belly \nplate regions. The estimated number of 210Pb atoms deposited on the AV inner surface is \n1.84 × 1012 \n.
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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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.002 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.002 |
| Open science | 0.001 | 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 it