Compton imaging for standoff radiation detection: Report A
Bibliographic record
Abstract
With funding from the Department of National Defence's (DND) Centre for Security Science, over the years from 2007 to 2012 a research team composed of scientists from Natural Resources Canada (NRCan), the National Research Council (NRC), and McGill University developed imagers to find radioactive sources and show their location overlaid on a photograph. These imagers were developed primarily for use in security/surveillance, and in consequence management. A follow-on DND-funded project called "Compton Imaging for Standoff Radiation Detection", governed by memoranda of understanding between DND and NRCan [1] and between DND and NRC [2], has been established in order to provide information useful in determining whether the Canadian Forces should procure Compton imagers. This is Report A specified in those agreements. We provide an introduction to Compton imaging, discuss the current technology readiness level of Compton imagers in Canada, and provide a status report of work under the project to date.
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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 | 0.004 | 0.003 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.000 | 0.001 |
| Bibliometrics | 0.003 | 0.002 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.003 | 0.001 |
| Open science | 0.002 | 0.002 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.010 | 0.013 |
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".