Poster - Wed Eve-53: Characteristics of Radiation Induced Light in Optical Fibers
Bibliographic record
Abstract
Most electronic portal imaging devices (EPIDs) developed so far use a Cu plate/phosphor screen to absorb x rays. This approach uses a thin screen (∼ 2 mm) to obtain a high spatial resolution, however this results in a low quantum efficiency (QE) for megavoltage (MV) x rays (typically 2–4%). The phosphor screen also contains high atomic number (high-Z) materials, resulting in an over-response of the detector to low energy x rays in dosimetric verification. Our overall goal is to develop a new high QE MV x-ray detector made of a low-Z material for both geometric and dosimetric verification in radiotherapy. The approach is based on converting x-ray energy into Cherenkov radiation in optical fibers. The design uses a thick (∼ 10–30 cm) matrix of optical fibres (to dramatically improve the QE) aligned with the incident x rays. This work investigates the characteristics of radiation-induced light in optical fibers and demonstrates that the predominant light source in optical fibers under high energy irradiation is indeed Cherenkov radiation. Thus, the feasibility of using Cherenkov radiation as the primary light source in the proposed Cherenkov detector is validated. This work was supported by the National Sciences and Engineering Research Council of Canada (NSERC).
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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 | 0.000 | 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 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".