Study of light collection in multi-crystal detectors
Bibliographic record
Abstract
Phoswich detectors are currently being considered by a number of investigators for depth-of-interaction measurement in PET and multi-modality emission/transmission imaging. Many parameters affect light collection and S/N ratio from such detectors, made of crystals having different emission wavelength, refractive index and light output. Experiments and simulation with DETECT97 have shown that light collection efficiency and energy resolution degrade steadily with distance from photodetector, mainly as a result of additional crystal interfaces. Simulation indicates that ground surfaces and high reflectivity diffuse reflector maximize light output. Measurements Lend to show that similar results are obtained with polished surfaces due to the presence of crystal defects. An excitation band at 400 nm in GSO is found to absorb a fraction of the light from scintillators emitting at short wavelengths, such as LSO. This effect is more significant for photodetectors such as PMTs that have their maximum sensitivity in the 400-nm range.
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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 | 0.003 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.002 | 0.003 |
| Science and technology studies | 0.001 | 0.003 |
| Scholarly communication | 0.001 | 0.003 |
| Open science | 0.002 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| 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".