Prototype neutron-capture counter for fast-coincidence assay of plutonium in residues
Why this work is in the frame
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Bibliographic record
Abstract
A new neutron coincidence counter with improved capabilities is being built as a commercial prototype. This counter uses {sup 6}LiF/ZnS(Ag) based scintillation detectors to achieve a short neutron die-away time ({tau} < 5 {micro}s), which increases the sensitivity of the counter to measurements of {sup 240}Pu by neutron coincidence counting. Greater sensitivity is required for measurements of residues, whose large {alpha},n-neutron yields create a high accidental coincidence rate in a counter with a relatively long {tau} (for example, ones that use {sup 3}He detectors). Traditional problems of gamma-ray sensitivity in scintillation detectors have been overcome through pulse processing techniques. Intrinsic differences of the excitation processes associated with neutron and gamma-ray interactions in the {sup 6}LiF/ZnS(Ag) detector allow these particles to be separated via pulse shape analysis (PSA). Degree of neutron/gamma-ray separation, factors affecting separation, neutron detection efficiency, and the effects of pulse shape and energy thresholds in a small test detector using a combination of commercially available and custom electronics are discussed. Final custom pulse processing techniques and PSA results are also presented.
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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 | 0.000 | 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 it