Transfer of ionization chamber calibration coefficients in linac MV x-ray beams
Bibliographic record
Abstract
A clinical linear accelerator and a Cobalt-60 teletherapy unit were used in combination with five cylindrical cavity ionization chambers to explore the possibility of transferring calibration coefficients from a calibrated reference ionization chamber to a field ionization chamber using linac megavoltage x-ray beams. Five cross-calibration setup methods were explored in Solid Water⢠and Lucite⢠solid phantoms using 6 MV and 18 MV beams. The calibration coefficients obtained using Lucite⢠phantoms were shown to have no statistical difference when compared to those obtained using Solid Water⢠phantoms. The calibration coefficients obtained with the 6 MV beam were statistically different than those obtained with the 18 MV beam. The robustness of the five transfer methods in a linac beam was investigated and one method was shown to have superior fault tolerance, with respect to the other methods.
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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".