Neutron flux and gamma dose rate measurements in RMC's SLOWPOKE-2 reactor
Bibliographic record
Abstract
A shielded sample enclosure in the RMC SLOWPOKE-2 reactor is being investigated for future studies of irradiation effects on I&C cables. To inform the construction of the enclosure, half-power (10 kW) MCNP simulations were performed Compared to aluminum, zircaloy-4 and tungsten, lead was found to be most effective at selectively shielding gamma rays for various enclosure designs. The neutron flux and gamma dose rates calculated in the selected enclosure model with 1 cm of lead shielding were 1.81⋅10 10 n⋅cm -2 ⋅s -1 and 37.9 krad⋅hr -1 , respectively. The neutron flux and gamma dose rates were then measured in the constructed enclosure. The neutron flux ranged from 1.80⋅10 10 to 2.81⋅10 10 n⋅cm -2 ⋅s -1 , while the gamma dose rate ranged from 91.5 to 111 krad⋅hr -1 . Additional trials were performed using cadmium and boric acid shielding on the probe to protect against neutron interference on the gamma probe and rectify differences between the modeling and experimental results. Using cadmium, the gamma dose rate increased between 10 and 29%, and using boric acid, was decreased by 13%.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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 source (direct Gemma or distilled Codex), 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".